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Journal articles on the topic 'Observation des jets'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Okita, Yuji, Katsutaka Nakamura, Yuuta Shiizaki, and Daisuke Nobuta. "LASER OBSERVATION ON THE INNER FLOW STRUCTURE OF WATER JETS(Water Jet)." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 337–42. http://dx.doi.org/10.1299/jsmeicjwsf.2005.337.

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Chen, Hao, and Gang Tao. "Research on Temperature Change and Microstructure Evolution of Bore in Steel Target Penetrated by Copper Jets." Materials Science Forum 667-669 (December 2010): 641–46. http://dx.doi.org/10.4028/www.scientific.net/msf.667-669.641.

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Copper fragments are found to adhere on penetration channel wall after copper jets penetrate steel target, and the research on it is helpful to know microstructure evolution of jets in the process of penetration and cooling time. This paper is based on the observation of bore in steel target penetrated by copper jets, and uses numerical simulation to study the process of copper jets penetration, then the change of temperature and grain size of jets adhered on penetration channel wall can be gotten, and the results agree with the observation of penetration channel wall taken by SEM. From the ob

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3

Shen, Yuandeng. "Observation and modelling of solar jets." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2246 (2021): 20200217. http://dx.doi.org/10.1098/rspa.2020.0217.

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The solar atmosphere is full of complicated transients manifesting the reconfiguration of the solar magnetic field and plasma. Solar jets represent collimated, beam-like plasma ejections; they are ubiquitous in the solar atmosphere and important for our understanding of solar activities at different scales, the magnetic reconnection process, particle acceleration, coronal heating, solar wind acceleration, as well as other related phenomena. Recent high-spatio-temporal-resolution, wide-temperature coverage and spectroscopic and stereoscopic observations taken by ground-based and space-borne sol

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4

Nagai, Hiroshi. "Inflow and Outflow (Jets) in NGC 1275." Proceedings of the International Astronomical Union 14, S342 (2018): 69–72. http://dx.doi.org/10.1017/s1743921318005744.

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AbstractNGC 1275 is one of the best targets to study the high energy emission mechanism in radio galaxies and the accretion flow properties using a young re-started jet 3C 84 as a prober of subpc-to-pc scale environment. In this proceeding, we review the observation results from a series of our VLBI observations and discuss on the origin of gamma-ray emission and accretion flow properties. We also briefly present the preliminary results from our recent ALMA observations.

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5

Chen, Jiaxuan. "Formation mechanism of blazar jets." Theoretical and Natural Science 19, no. 1 (2023): 169–75. http://dx.doi.org/10.54254/2753-8818/19/20230529.

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In research of astronomy, cosmology and the basic theoretical physics, the black hole is one of the most concerned celestial bodies. AGN is a kind of observation source with supermassive black hole as the central core, among which Blazar is the key observation subclass of the observer whose jet is facing the Earth. Therefore, the study of the jet has become an crucial subject of black hole research. In this paper, I start with the basic structure model of AGN, briefly describe the characteristics and mechanisms of each structure, especially the jet, and afterward introduce the observed spectra

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6

Hillier, A., and V. Polito. "Observation of bi-directional jets in a prominence." Astronomy & Astrophysics 651 (July 2021): A60. http://dx.doi.org/10.1051/0004-6361/201935774.

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Quiescent prominences host a large range of flows, many driven by buoyancy, which lead to velocity shear. The presence of these shear flows could bend and stretch the magnetic field resulting in the formation of current sheets which can lead to magnetic reconnection. Though this has been hypothesised to occur in prominences, with some observations that are suggestive of this process, clear evidence has been lacking. In this paper we present observations performed on June 30, 2015 using the Interface Region Imaging Spectrograph Si IV and Mg II slit-jaw imagers of two bi-directional jets that oc

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SHIMIZU, Seiji, Yukio HIRAOKA, and Takanori NISHIYAMA. "Instantaneous Photographic Observation of Abrasive Water Suspension Jets." JSME International Journal Series B 45, no. 4 (2002): 830–35. http://dx.doi.org/10.1299/jsmeb.45.830.

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Ishikawa, Tatsurou, and Seiji Shimizu. "208 High Speed Observation of Abrasive Water Jets." Proceedings of Conference of Tohoku Branch 2008.43 (2008): 217–18. http://dx.doi.org/10.1299/jsmeth.2008.43.217.

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9

Kayshap, P., K. Murawski, A. K. Srivastava, and B. N. Dwivedi. "Rotating network jets in the quiet Sun as observed by IRIS." Astronomy & Astrophysics 616 (August 2018): A99. http://dx.doi.org/10.1051/0004-6361/201730990.

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Aims. We perform a detailed observational analysis of network jets to understand their kinematics, rotational motion, and underlying triggering mechanism(s). We analyzed the quiet-Sun (QS) data. Methods. IRIS high-resolution imaging and spectral observations (slit-jaw images: Si IV 1400.0 Å; raster: Si IV 1393.75 Å) were used to analyze the omnipresent rotating network jets in the transition region (TR). In addition, we also used observations from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamic Observation (SDO). Results. The statistical analysis of 51 network jets is perform

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10

Panesar, Navdeep K., Viggo H. Hansteen, Sanjiv K. Tiwari, Mark C. M. Cheung, David Berghmans, and Daniel Müller. "Solar Orbiter and SDO Observations, and a Bifrost Magnetohydrodynamic Simulation of Small-scale Coronal Jets." Astrophysical Journal 943, no. 1 (2023): 24. http://dx.doi.org/10.3847/1538-4357/aca1c1.

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Abstract We report high-resolution, high-cadence observations of five small-scale coronal jets in an on-disk quiet Sun region observed with Solar Orbiter’s EUI/HRIEUV in 174 Å. We combine the HRIEUV images with the EUV images of SDO/AIA and investigate the magnetic setting of the jets using coaligned line-of-sight magnetograms from SDO/HMI. The HRIEUV jets are miniature versions of typical coronal jets as they show narrow collimated spires with a base brightening. Three out of five jets result from a detectable minifilament eruption following flux cancelation at the neutral line under the mini

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11

Guetta, Dafne, Roi Rahin, Imre Bartos, and Massimo Della Valle. "Constraining the fraction of core-collapse supernovae harbouring choked jets with high-energy neutrinos." Monthly Notices of the Royal Astronomical Society 492, no. 1 (2020): 843–47. http://dx.doi.org/10.1093/mnras/stz3245.

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ABSTRACT The joint observation of core-collapse supernovae with gamma-ray bursts shows that jets can be launched in the aftermath of stellar core collapse, likely by a newly formed black hole that accretes matter from the star. Such gamma-ray bursts have only been observed accompanying Type Ibc supernovae, indicating a stellar progenitor that lost its hydrogen envelope before collapse. According to recent hypothesis, it is possible that jets are launched in core-collapse events even when the progenitors still retain their hydrogen envelopes; however, such jets are not able to burrow through th

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12

Erlandson, R. E., P. K. Swaminathan, C. I. Meng, et al. "observation of auroral emissions induced by artificial plasma jets." Geophysical Research Letters 26, no. 11 (1999): 1553–56. http://dx.doi.org/10.1029/1999gl900282.

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13

Soyama, Hitoshi, Yoshiaki Yanauchi, Kazunori Sato, Toshiaki Ikohagi, Risaburo Oba, and Ryoichiro Oshima. "High-speed observation of ultrahigh-speed submerged water jets." Experimental Thermal and Fluid Science 12, no. 4 (1996): 411–16. http://dx.doi.org/10.1016/0894-1777(95)00124-7.

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14

KIRA, AKIO, KAZUYUKI HOKAMOTO, YASUHIRO UJIMOTO, SHOICHIRO KAI, and MASAHIRO FUJITA. "OBSERVATION OF METAL JET IN EXTREMELY HIGH IMPULSIVE PRESSURE GENERATOR." International Journal of Modern Physics B 22, no. 09n11 (2008): 1653–58. http://dx.doi.org/10.1142/s0217979208047213.

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A new technique has been developed to generate an extremely high impulsive pressure by using an explosive. A metal jet, typically observed in explosive welding is used in this technique. The behavior of metal jet is crucial to the design of pressure generator. The experimental observation was made by the collision of metal jet on a metal block surface. Many craters formed by the collision of metal jets on the surface of the metal block were observed. The craters were overlapped and distributed in a wide range. The diameter of the largest crater was 0.5 mm. The quantity of the discharged metal

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15

Venturi, Giacomo, Alessandro Marconi, Matilde Mingozzi, Giovanni Cresci, Stefano Carniani, and Filippo Mannucci. "Turbulence/outflows perpendicular to low-power jets in Seyfert galaxies." Proceedings of the International Astronomical Union 15, S359 (2020): 464–66. http://dx.doi.org/10.1017/s1743921320002197.

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AbstractWe present recent results from our MAGNUM survey of nearby active galactic nuclei (AGN), which exploits observations from the optical/near-IR integral field spectrograph MUSE at VLT. We detect strongly enhanced line widths in emission line maps of four galaxies perpendicularly to their low-power jets and AGN ionisation cones, indicative of turbulent/outflowing material. The observation of a similar phenomenon in other works suggests that it originates from an interaction mechanism between the jet and the galaxy disc through which it propagates.

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16

Wang, H., H. Lühr, and A. J. Ridley. "Plasma convection jets near the poleward boundary of the nightside auroral oval and their relation to Pedersen conductivity gradients." Annales Geophysicae 28, no. 4 (2010): 969–76. http://dx.doi.org/10.5194/angeo-28-969-2010.

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Abstract. In this work, we have shown that the ionospheric azimuthal plasma velocity jets near the open-closed field line boundary on the nightside can be associated with the peak in the ionospheric conductivity gradient. Both model and DMSP observations have been utilized to conduct this investigation. The model tests show that when the gradient of conductivity in the poleward boundary becomes sharper, convection peaks appear around the poleward edge of the aurora. The model results have been confirmed by DMSP observations. Hundreds of large ion flow events are identified from one year DMSP o

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17

Nathanail, Antonios, Ramandeep Gill, Oliver Porth, Christian M. Fromm, and Luciano Rezzolla. "On the opening angle of magnetized jets from neutron-star mergers: the case of GRB170817A." Monthly Notices of the Royal Astronomical Society 495, no. 4 (2020): 3780–87. http://dx.doi.org/10.1093/mnras/staa1454.

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ABSTRACT The observations of GW170817/GRB170817A have confirmed that the coalescence of a neutron-star binary is the progenitor of a short gamma-ray burst (GRB). In the standard picture of a short GRB, a collimated highly relativistic outflow is launched after merger and it successfully breaks out from the surrounding ejected matter. Using initial conditions inspired from numerical-relativity binary neutron-star merger simulations, we have performed general-relativistic hydrodynamic (HD) and magnetohydrodynamic (MHD) simulations in which the jet is launched and propagates self-consistently. Th

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18

Xue, Xiao Chun, Yong Gang Yu, and Qi Zhang. "Experimental Study on Expansion Process of High Pressure Twin Combustion-Gas Jets in Liquid." Applied Mechanics and Materials 148-149 (December 2011): 212–15. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.212.

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In order to investigate the multipoint ignition process and the combustion stability controlling mechanism of the bulk-loaded liquid propellant gun, the cylindrical stepped-wall observation chambers and cylindrical observation chambers are designed. The expansion process and interaction of high-speed twin combustion-gas jets in liquid are studied by high speed photographic system. The influence of chamber structure, nozzle diameter, dual-orifice interval, jet pressure on twin gas jets expansion process has been discussed.

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19

Soker, Noam. "Are jets rotating at the launching?" Proceedings of the International Astronomical Union 5, H15 (2009): 249–50. http://dx.doi.org/10.1017/s1743921310009075.

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AbstractI argue that the Doppler shift asymmetries observed in some young stellar object (YSO) jets result from the interaction of the jets with the circumstellar gas, rather than from jets' rotation. The jets do rotate, but at a velocity much below claimed values. During the meeting I carefully examined new claims, and found problems with the claimed jets' rotation. I will challenge any future observation that will claim to detect jet rotation in YSOs that requires the jets (and not a wind) to be launched from radii much larger than the accreting stellar radius. I conclude that the most likel

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20

Wilkinson, P. N., A. J. Kus, T. J. Pearson, A. C. S. Readhead, and T. J. Cornwell. "The nuclear jets in 3C309.1 & 3C380." Symposium - International Astronomical Union 119 (1986): 165–66. http://dx.doi.org/10.1017/s0074180900152556.

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8 station VLBI maps of the nuclear jets in 3C309.1 and 3C380 reveal complex, bent, structures which seem hard to reconcile with the concept of ballistic outflow. Together with the observation of “flaring” in the MERLIN/EVN map of the 3C309.1 jet the maps point strongly to the jets being confined fluid flows.

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21

Peters, Geraldine J. "Bipolar Jets, Hot Interaction Regions, and Colliding Winds in OB Interacting Binaries." Proceedings of the International Astronomical Union 2, S240 (2006): 148–53. http://dx.doi.org/10.1017/s174392130700395x.

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AbstractContemporary information on the nature of the circumstellar environment in early-type interacting binaries derived from observation is discussed. Emphasis is placed on results from FUV spectroscopy. New spectra from the FUSE spacecraft and earlier FUV observations with IUE have revealed the presence of hot interaction regions, bipolar outflows, splash outflows, and accretion hot spots in Algol-type systems with B-type mass gainers. In addition, close O-type pairs and systems containing O + W stars show a shock-heated region generated from their colliding winds. Recent FUSE observations

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22

Norman, Michael L. "Interpretation of Extragalactic Jets." International Astronomical Union Colloquium 89 (1986): 425–37. http://dx.doi.org/10.1017/s0252921100086206.

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The subject of this paper is the interpretation of extragalactic radio jets. In this paper I will focus on what we have learned about the nature of extragalactic jets on the basis of model calculations. By model I mean any set of calculations, whether analytic, semi-analytic or numerical, which, when carried through from their respective assumptions to their internally self-consistent conclusions, help place constraints on the physical parameters and processes in the jets and their associated radio lobes. In this field, a visual inspection of a modern high-resolution radio interferometric obse

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23

Kuridze, D., T. V. Zaqarashvili, V. Henriques, M. Mathioudakis, F. P. Keenan, and A. Hanslmeier. "KELVIN–HELMHOLTZ INSTABILITY IN SOLAR CHROMOSPHERIC JETS: THEORY AND OBSERVATION." Astrophysical Journal 830, no. 2 (2016): 133. http://dx.doi.org/10.3847/0004-637x/830/2/133.

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24

Suzuki-Vidal, F., S. Patankar, S. V. Lebedev, et al. "Observation of energetic protons trapped in laboratory magnetic-tower jets." New Journal of Physics 15, no. 12 (2013): 125008. http://dx.doi.org/10.1088/1367-2630/15/12/125008.

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25

Kornack, T. W., P. K. Sollins, and M. R. Brown. "Experimental observation of correlated magnetic reconnection and Alfvénic ion jets." Physical Review E 58, no. 1 (1998): R36—R39. http://dx.doi.org/10.1103/physreve.58.r36.

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26

Xing, Yi, Zhongxiang Wang, Xiao Zhang, Yang Chen, and V. Jithesh. "Fermi Observation of the Jets of the Microquasar SS 433." Astrophysical Journal 872, no. 1 (2019): 25. http://dx.doi.org/10.3847/1538-4357/aafc60.

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27

Liu, Jiajia, Fang Fang, Yuming Wang, Scott W. McIntosh, Yuhong Fan, and Quanhao Zhang. "ON THE OBSERVATION AND SIMULATION OF SOLAR CORONAL TWIN JETS." Astrophysical Journal 817, no. 2 (2016): 126. http://dx.doi.org/10.3847/0004-637x/817/2/126.

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KOBAYASHI, Ryota, Koichi NISHIBE, Kazuhiko YOKOTA, and Kotaro SATO. "Observation of Behavior of Synthetic Jets in Asymmetric Flow Field." Proceedings of Conference of Tokai Branch 2018.67 (2018): 326. http://dx.doi.org/10.1299/jsmetokai.2018.67.326.

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29

Hu, Zhitao, and Yonggang Yu. "Expansion characteristics of multiple wall jets in cylindrical observation chamber." Applied Thermal Engineering 113 (February 2017): 1396–409. http://dx.doi.org/10.1016/j.applthermaleng.2016.11.140.

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30

Qiu, Jiawei. "Misalignment of jet, orbital plane, and accretion disk observed in black hole binaries." Theoretical and Natural Science 31, no. 1 (2024): 256–61. http://dx.doi.org/10.54254/2753-8818/31/20241148.

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Black holes are interesting objects and prove to be the leading edge of testing and verifying of our understandings in gravity. Among some of the most sought after quantities is the spin of the black hole: it is closely related to how the black hole system behaves. Various attempts have been made to derive the spin of black holes, in which the orientation in space could be deduced using the spectrum produced by the accretion disk, observation of the jets produced by black holes, and calculation of the orbit of black hole binaries using light and velocity curves. These observations, however, ca

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Obonyo, W. O., M. G. Hoare, S. L. Lumsden, et al. "Non-thermal radio emission from massive protostars in the SARAO MeerKAT Galactic Plane Survey." Monthly Notices of the Royal Astronomical Society 533, no. 4 (2024): 3862–77. http://dx.doi.org/10.1093/mnras/stae2020.

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ABSTRACT We present an investigation of the L-band emission from known massive young stellar objects in the South African Radio Astronomy Observatory MeerKAT Galactic Plane Survey to search for non-thermal radio emitters in the sample. A total of 398 massive protostars, identified from the Red MSX Source survey, are located within the survey region. Among these, 162 fields that host the protostars are isolated from nearby bright H ii regions, allowing for the study of any ionized jets present. Seventy-one of these fields have jets with five-sigma detections or higher, corresponding to a detect

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32

BADEN, ANDREW R. "JETS AND KINEMATICS IN HADRONIC COLLISIONS." International Journal of Modern Physics A 13, no. 11 (1998): 1817–45. http://dx.doi.org/10.1142/s0217751x98000809.

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Analysis of colliding-beam hadron experiments [Formula: see text] often depend upon observation of "jets" — a highly collimated spray of particles such as π, K, e, μ and γ's forming clusters of energy deposition in calorimeters. In this paper we outline how to define jets from such clusters and discuss the meaning of jet quantities such as transverse energy and mass. Data from the DØ experiment are used to illustrate these concepts. In addition, we review the motivations for using certain optimal coordinates for describing energy–momentum four-vectors, and derive interesting relationships amon

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Livio, Mario. "The Formation of Astrophysical Jets." International Astronomical Union Colloquium 163 (1997): 845–66. http://dx.doi.org/10.1017/s0252921100044298.

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AbstractIt is assumed that the acceleration and collimation mechanisms of jets are the same in all the classes of astrophysical objects which are observed to produce jets. These classes now include: active galactic nuclei, young stellar objects, massive x-ray binaries, low mass x-ray binaries, black hole x-ray transients, symbiotic systems, planetary nebulae, and supersoft x-ray sources.On the basis of this assumption, an attempt is made, to identify the necessary ingredients for the acceleration and collimation mechanism. It is argued that: (i) jets are produced at the center of accretion dis

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Singha, Mainak, Christopher P. O’Dea, and Stefi A. Baum. "What Drives the Ionized Gas Outflows in Radio-Quiet AGN?" Galaxies 11, no. 4 (2023): 85. http://dx.doi.org/10.3390/galaxies11040085.

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We review the mechanisms driving the ionized gas outflows in radio-quiet (RQ) AGN. Although it constitutes ∼90% of the AGN population, what drives these outflows in these AGNs remains an open question. High-resolution imaging and integral field unit (IFU) observation is key to spatially resolving these outflows, whereas radio observations are important to comprehend the underlying radiative processes. Radio interferometric observations have detected linear, collimated structures on the hundreds of pc scale in RQ AGN, which may be very similar to the extended radio jets in powerful galaxies. Pr

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Shi, Fanpeng, Dong Li, Zongjun Ning, Jun Xu, Yuxiang Song, and Yuzhi Yang. "Energy estimation of small-scale jets from the quiet-Sun region." Astronomy & Astrophysics 686 (June 2024): A279. http://dx.doi.org/10.1051/0004-6361/202449377.

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Context. Solar jets play a role in coronal heating and the supply of solar wind. Aims. In this study, we calculate the energies of 23 small-scale jets emerging from a quiet-Sun region in order to investigate their contributions to coronal heating. Methods. We used data from the High-Resolution Imager (HRI) of the Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter. Small-scale jets were observed by the HRIEUV 174 Å passband in the high cadence of 6 s. These events were identified by the time–distance stacks along the trajectories of jets. Using the simultaneous observation from the Atm

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Pavez, Cristian, José Pedreros, Ariel Tarifeño-Saldivia, and Leopoldo Soto. "Observation of plasma jets in a table top plasma focus discharge." Physics of Plasmas 22, no. 4 (2015): 040705. http://dx.doi.org/10.1063/1.4919260.

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Soyama, Hitoshi, Yoshiaki Yamauchi, Kazunori Sato, Toshiaki Ikohagi, Risaburo Oba, and Ryoichiro Oshima. "High-Speed Observation of Ultra high-Speed Cavitating Submerged Water Jets." Transactions of the Japan Society of Mechanical Engineers Series B 59, no. 568 (1993): 3714–19. http://dx.doi.org/10.1299/kikaib.59.3714.

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Biermann, Peter L., and Peter A. Strittmatter. "Shockwaves in Extended Near-Relativistic Jets." Symposium - International Astronomical Union 129 (1988): 85–86. http://dx.doi.org/10.1017/s0074180900134047.

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The origin of the sharp near infrared cutoff in the continuous energy distribution of many compact non-thermal sources (active nuclei or knots in jets) is considered under the assumption that particle acceleration takes place in shockwaves. Energy losses due to synchrotron emission and Compton interactions set upper limits to both electron and proton energies. In this case the upstream disturbance of the flow is dominated by the most energetic protons which are postulated, by analogy with the solar wind, to excite a turbulent wave spectrum of Kolmogorov type in this region. We predict for near

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Chen, Yongyun 陈永云, Qiusheng 顾秋生 Gu, Junhui 樊军辉 Fan, et al. "Observational Evidence for a Correlation between the Magnetic Field of Jets and Star Formation Rate in Host Galaxies." Astrophysical Journal 978, no. 2 (2025): 125. https://doi.org/10.3847/1538-4357/ad9b8a.

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Abstract Accretion supermassive black holes in the center of active galaxies usually produce “jet”-collimated bipolar outflows of relativistic particles. Magnetic fields near the black hole event horizon may play a crucial role in the formation of jets/outflows. Both theory and observation indicate that jets/outflows driven by centrally active supermassive black holes have a feedback effect on the overall properties of the host galaxies. Therefore, the magnetic field is a key ingredient for the formation and evolution of galaxies. Here, we report a clear correlation between the magnetic field

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40

Preston, R. A., S. J. Tingay, D. L. Jauncey, et al. "Monitoring the Jet in Centaurus A at 0.1 Parsec Resolution." Symposium - International Astronomical Union 175 (1996): 21–22. http://dx.doi.org/10.1017/s0074180900079857.

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Centaurus A is the closest active extragalactic radio source, at a distance of approximately 3.5 Mpc, and is identified with the peculiar elliptical galaxy NGC 5128. As such it is a very important target for observations of the small-scale (sub-parsec) and large-scale (kpc) structures in extragalactic jets. Here we present Mk-II VLBI observations made at 8.4 GHz over a 4.3 year period from early 1991 until mid-1995, as well as a 4.8 GHz observation that was co-eval with one of the 8.4 GHz observations. All of the observations were made with the SHEVE array except for the last observation which

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41

Tassama, Abdissa, and Tolu Biressa. "Role of active galactic nuclei and flow of relativistic jets." Proceedings of the International Astronomical Union 15, S356 (2019): 252. http://dx.doi.org/10.1017/s1743921320003026.

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AbstractThe astrophysics of Active Galactic Nuclei (AGN) is one of the long outstanding issues in searches among the scientific communities raised with diverse perspectives like nebula, quasars, etc some decades ago. Currently, this exotic system is at least understood as the center of an active galaxy. Thus, the consensus of this recent theory has opened up a number of research issues for the progress of astrophysical science including how the hosting galaxy evolves with the AGN, how matter and energy flow towards and outwards, etc. Moreover, most of the AGNs possess Supermassive Black Holes

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Baczko, A. K., R. Schulz, M. Kadler, et al. "Asymmetric jet production in the active galactic nucleus of NGC 1052." Astronomy & Astrophysics 623 (February 26, 2019): A27. http://dx.doi.org/10.1051/0004-6361/201833828.

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Context. Few active galactic nuclei (AGN) reveal double-sided jet systems. However, these systems are crucial to understand basic physical properties of extragalactic jets. Aims. We address the questions whether jets in AGN are symmetric in nature, how well they are collimated on small scales, and how they evolve with time. Methods. We monitored the sub-parsec scale morphology of NGC 1052 with the Very Long Baseline Array at 43 GHz from 2005 to 2009. Results. A detailed study of 29 epochs show a remarkable asymmetry between both jets. A kinematic analysis of the outflows reveals higher apparen

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Suzuki, Bunji, Hiroshi Kurihara, and Jun-ichi Watanabe. "Detection of C2 Jets of Comet Austin 1989c1." Publications of the Astronomical Society of Japan 42, no. 6 (1991): L93—L97. https://doi.org/10.1093/pasj/42.6.l93.

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Abstract A CCD imaging observation of Comet Austin 1989c1 was carried out with a 60-cm telescope. By applying a ring masking technique to C2 images, we have found jet structures extending to about 30,000 km. Two morphological types of the jet structures were detected: one is a spiral type found in Comet P/Halley; the other is a straight structure in the anti-solar direction. This is the first case of gaseous-jet detection of a new comet in the Oort sense.

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Zhang, Xiyun, Yuhan Luo, and Yu Du. "Observation of Boundary-Layer Jets in the Northern South China Sea by a Research Vessel." Remote Sensing 16, no. 20 (2024): 3872. http://dx.doi.org/10.3390/rs16203872.

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Boundary-layer jets (BLJs) in the South China Sea play an important role in heavy rainfall in South China, yet observations in maritime locations are still limited. This study examines the vertical structures and temporal evolutions of BLJs in the northern South China Sea using intensive radiosonde observations from a research vessel from 15 to 18 June 2022 and evaluates the performance of various reanalysis datasets in capturing these features. Observations identified BLJs with jet cores at altitudes of approximately 500–700 m. Wind speeds slightly decreased from 15 to 16 June and then signif

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Bing, Qi, Huang Jian-Jun, Zhang Zhe-Huang, and Wang De-Zhen. "Observation of Periodic Multiplication and Chaotic Phenomena in Atmospheric Cold Plasma Jets." Chinese Physics Letters 25, no. 9 (2008): 3323–25. http://dx.doi.org/10.1088/0256-307x/25/9/061.

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Belloche, A. "Observation of rotation in star forming regions: clouds, cores, disks, and jets." EAS Publications Series 62 (2013): 25–66. http://dx.doi.org/10.1051/eas/1362002.

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Zhao, L., and C. K. Ong. "Direct observation of photonic jets and corresponding backscattering enhancement at microwave frequencies." Journal of Applied Physics 105, no. 12 (2009): 123512. http://dx.doi.org/10.1063/1.3151706.

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Punsly, Brian. "The Details of Limb Brightening Reveal the Structure of the Base of the Jet in M87 for the First Time." Astrophysical Journal 936, no. 1 (2022): 79. http://dx.doi.org/10.3847/1538-4357/ac82f1.

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Abstract It has become commonplace in astronomy to describe the transverse coarse structure of jets in loosely defined terms such as “sheath” and “spine” based on discussions of parsec scale properties. But, the applicability, dimension, and prominence of these features on sub-light-year scales has previously been unconstrained by observation. The first direct evidence of jet structure near the source in M87 is extreme limb brightening (a double-rail morphology), 0.3–0.6 mas from the source, which is prominent in observations with high resolution and sensitivity. Intensity crosscuts of these i

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Zhang, Yan-Jie, Qing-Min Zhang, Jun Dai, Zhe Xu, and Hai-Sheng Ji. "Recurrent coronal jets observed by SDO/AIA." Research in Astronomy and Astrophysics 21, no. 10 (2021): 262. http://dx.doi.org/10.1088/1674-4527/21/10/262.

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Abstract In this paper, we carried out multiwavelength observations of three recurring jets on 2014 November 7. The jets originated from the same region at the edge of AR 12205 and propagated along the same coronal loop. The eruptions were generated by magnetic reconnection, which is evidenced by continuous magnetic cancellation at the jet base. The projected initial velocity of jet2 is ∼402 km s−1. The accelerations in the ascending and descending phases of jet2 are not consistent, the former is considerably larger than the value of g ⊙ at the solar surface, while the latter is lower than g ⊙

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Tong, Wei Li, Ming K. Tan, Jit Kai Chin, K. S. Ong, and Yew Mun Hung. "Coupled effects of hydrophobic layer and vibration on thermal efficiency of two-phase closed thermosyphons." RSC Advances 5, no. 14 (2015): 10332–40. http://dx.doi.org/10.1039/c4ra14589e.

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Observation of elongated liquid jets and entrained droplets from the liquid–vapor interface induced by high-acceleration vibration provides valuable insights into the physical process of liquid–vapor interaction phenomena in a thermosyphon (TPCT).

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