Bibliografias temáticas / Radio-quiet AGN

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Literatura científica selecionada sobre o tema "Radio-quiet AGN"

Autor: Grafiati

Publicado: 1 de abril de 2023

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Artigos de revistas sobre o assunto "Radio-quiet AGN"

Young, S., J. H. Hough, D. J. Axon e J. A. Bailey. "Beaming in Radio-Quiet AGN". International Astronomical Union Colloquium 163 (1997): 837–38. http://dx.doi.org/10.1017/s0252921100044262.

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AbstractWe have obtained new optical spectropolarimetric data for the radio-quiet Seyfert NGC 1068, taken through apertures on the nucleus and at two positions within the ionization/scattering cone. The equivalent width of scattered broad-Hβ at these positions, is consistent with the presence of intrinsically beamed continuum radiation.

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O'Brien, Paul T., e Karen M. Leighly. "AGN Watch continuum monitoring of radio-quiet and radio-loud AGN". Advances in Space Research 21, n.º 1-2 (janeiro de 1998): 67–76. http://dx.doi.org/10.1016/s0273-1177(97)00615-7.

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Sasikumar, Silpa, e Preeti Kharb. "Looking at radio-quiet AGN with radio polarimetry". Acta Astrophysica Taurica 3, n.º 1 (14 de março de 2022): 17–22. http://dx.doi.org/10.31059/aat.vol3.iss1.pp17-22.

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The dominant radio emission mechanism in radio-quiet quasars (RQQs) is an open question. Primary contenders include: low-power radio jets, winds, star-formation and coronal emission. Our work suggests that radio polarization and emission-line studies can help to distinguish between these scenarios and determine the primary contributor. Our multi-frequency, multi-scale radio polarization study has revealed a composite jet and "wind" radio outflow in the radio-intermediate quasar, III Zw 2, as well as in the BALQSO, Mrk 231. Our radio polarization study in conjunction with the [O III] emission-line study of five type 2 RQQs have provided insights on the interplay of jets/winds and emission-line gas. These sources reveal an anti-correlation between polarized radio emission and [O III] emission. This is similar to that observed in some radio-loud active galactic nuclei (AGN) in the literature and suggests that the radio emission could be depolarized by the emission-line gas. Overall, our work suggests that a close interaction between the radio outflow and the surrounding gaseous environment is likely to be responsible for their stunted form in RQ and RI AGN.

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Matt, G. "BeppoSAX Observations of Radio-quiet AGN". Physica Scripta T77 (1 de janeiro de 1998): 62–64. http://dx.doi.org/10.1088/0031-8949/1998/t77/016.

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Matt, G. "X-Rays from radio-quiet AGN". Astronomical & Astrophysical Transactions 20, n.º 2 (agosto de 2001): 253–61. http://dx.doi.org/10.1080/10556790108229706.

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Padovani, P., M. Bonzini, N. Miller, K. I. Kellermann, V. Mainieri, P. Rosati, P. Tozzi e S. Vattakunnel. "The AGN content of deep radio surveys and radio emission in radio-quiet AGN. Why every astronomer should care about deep radio fields". Proceedings of the International Astronomical Union 9, S304 (outubro de 2013): 79–85. http://dx.doi.org/10.1017/s1743921314003391.

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AbstractWe present our very recent results on the sub-mJy radio source populations at 1.4 GHz based on the Extended Chandra Deep Field South VLA survey, which reaches ~ 30 μJy, with details on their number counts, evolution, and luminosity functions. The sub-mJy radio sky turns out to be a complex mix of star-forming galaxies and radio-quiet AGN evolving at a similar, strong rate and declining radio-loud AGN. While the well-known flattening of the radio number counts below 1 mJy is mostly due to star-forming galaxies, these sources and AGN make up an approximately equal fraction of the sub-mJy sky. Our results shed also light on a fifty-year-old issue, namely radio emission from radio-quiet AGN, and suggest that it is closely related to star formation, at least at z ~ 1.5 − 2. The implications of our findings for future, deeper radio surveys, including those with the Square Kilometre Array, are also discussed. One of the main messages, especially to non-radio astronomers, is that radio surveys are reaching such faint limits that, while previously they were mainly useful for radio quasars and radio galaxies, they are now detecting mostly star-forming galaxies and radio-quiet AGN, i.e., the bulk of the extragalactic sources studied in the infrared, optical, and X-ray bands.

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Kukula, M. J., J. S. Dunlop, G. L. Taylor e D. H. Hughes. "Host Galaxies of Radio-Loud & Radio-Quiet AGN". Symposium - International Astronomical Union 175 (1996): 248–49. http://dx.doi.org/10.1017/s0074180900080682.

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A clear understanding of both the differences and similarities between the host galaxies of the three main classes of powerful active galaxy – radio-quiet quasars (RQQs), radio-loud quasars (RLQs) and radio galaxies (RGs) – is vital in any attempt to unify or relate the various manifestations of the AGN phenomenon. The unification of RLQs and RGs via orientation effects requires that the hosts of the two types be derived from the same population of galaxies. Meanwhile, the correlation between radio power and host morphology in nearby AGN, with radio-quiet objects (Seyferts) occurring in disc systems and radio-loud sources in ellipticals, is generally assumed to persist at higher redshifts and nuclear luminosities. However, in both cases the evidence remains ambiguous and, moreover, many previous studies have been based on poorly selected samples.

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Kharb, Preeti, e Sasikumar Silpa. "Looking for Signatures of AGN Feedback in Radio-Quiet AGN". Galaxies 11, n.º 1 (8 de fevereiro de 2023): 27. http://dx.doi.org/10.3390/galaxies11010027.

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In this article, we discuss the state of “AGN feedback” in radio-quiet (RQ) AGN. This study involves heterogeneous samples of nearby Seyfert and LINER galaxies as well as quasi-stellar objects (QSOs) that have been observed at low radio frequencies (few ∼100 MHz) with the upgraded Giant Meterwave Radio Telescope (GMRT) and ∼GHz frequencies with the Karl G. Jansky Very Large Array (VLA) and Very Long Baseline Array (VLBA). These multi-frequency, multi-resolution observations detect a range of arcsecond-scale radio spectral indices that are consistent with the presence of multiple contributors including starburst winds and AGN jets or winds; steep spectrum “relic” emission is observed as well. Polarization-sensitive data from the VLA and GMRT suggest that the radio outflows are stratified (e.g., in IIIZw2, Mrk231); distinct polarization signatures suggest that there could either be a “spine + sheath” structure in the radio outflow, or there could be a “jet + wind” structure. Similar nested biconical outflows can also explain the VLBA and SDSS emission-line data in the KISSR sample of double-peaked emission-line Seyfert and LINER galaxies. Furthermore, the modeling of the emission-lines with plasma modeling codes such as MAPPINGS indicates that parsec-scale jets and winds in these sources can disturb or move the narrow-line region (NLR) gas clouds via the “shock + precursor” mechanism. Apart from the presence of “relic” emission, several Seyfert and LINER galaxies show clear morphological signatures of episodic jet activity. In one such source, NGC2639, at least four distinct episodes of jets are observed, the largest one of which was only detectable at 735 MHz with the GMRT. Additionally, a ∼6 kpc hole in the CO molecular gas along with a dearth of young stars in the center of its host galaxy is observed. Multiple jet episodes on the 10–100 parsec scales and a ∼10 parsec hole in the molecular gas is also observed in the Seyfert galaxy NGC4051. This suggests a link between episodic jet activity in RQ AGN and “AGN feedback” influencing the evolution of their host galaxies. However, a similar simple relationship between radio outflows and molecular gas mass is not observed in the Palomar–Green (PG) QSO sample, indicating that “AGN feedback” is a complex phenomenon in RQ AGN. “AGN feedback” must occur through the local impact of recurring multi-component outflows in RQ AGN. However, global feedback signatures on their host galaxy properties are not always readily evident.

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Marziani, P., M. Calvani e J. W. Sulentic. "On the Difference Between Radio Quiet and Radio Loud AGN". International Astronomical Union Colloquium 163 (1997): 761–62. http://dx.doi.org/10.1017/s0252921100043840.

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AbstractA systematic difference in alignment between the central black hole spin and the angular momentum of the accreting gas may help to explain several differences found in the optical and UV HST spectra of radio loud and radio quiet AGN.

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Villforth, Carolin, Kari Nilsson, Roy Østensen, Jochen Heidt, Sami-Matias Niemi e Janine Pforr. "Intranight polarization variability in radio-loud and radio-quiet AGN". Monthly Notices of the Royal Astronomical Society 397, n.º 4 (21 de agosto de 2009): 1893–908. http://dx.doi.org/10.1111/j.1365-2966.2009.14886.x.

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Mais fontes

Livros sobre o assunto "Radio-quiet AGN"

Guida, Michael. Listening to British Nature. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780190085537.001.0001.

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This cultural history of early twentieth-century Britain shows how the sounds and rhythms of the natural world were listened to, interpreted, and used amid the pressures of modern life. The book argues that despite and sometimes because of the chaos of wartime and the struggle to recover, nature’s voices were drawn close to provide everyday security, sustenance, and a sense of the future. Nature’s sonic presences were not obliterated by the noise of war, the advent of radio broadcasting, and the rush of the everyday, rather they came to complement and provide alternatives to modern modes of living. This book examines how trench warfare demanded the creation of new listening cultures in order to understand danger and to imagine survival. It tells of the therapeutic communities who used quiet and rural rhythms to restore shell-shocked soldiers, and of ramblers who sought to immerse themselves in the sensualities of the outdoors. It shows how home front listening in the Blitz was punctuated by birdsong, broadcast by the BBC. In focusing on the sensing of sounds and rhythms, this study demonstrates how nature retained its emotional potency as the pace and unpredictabilities of life seemed to increase and new man-made sounds and sonic media appeared all around. To listen to nature, in relation to the changing soundscape of the modernizing world, was to cultivate an intimate connection with its vibrations and to sense an enduring order and beauty that could be part of the future.

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Capítulos de livros sobre o assunto "Radio-quiet AGN"

Wiita, Paul J., Gopal-Krishna e Ram Sagar. "Optical Microvariability in Radio Quiet Quasars". In Multi-Wavelength Continuum Emission of AGN, 414. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_127.

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Francis, Paul J. "Optical Differences Between Radio-Loud and Radio-Quiet QSOs". In Multi-Wavelength Continuum Emission of AGN, 503. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_201.

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Kukula, M. J., J. S. Dunlop, G. L. Taylor e D. H. Hughes. "Host Galaxies of Radio-Loud & Radio-Quiet AGN". In Extragalactic Radio Sources, 248–49. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0295-4_89.

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Mannheim, Karl. "On the Difference Between Radio Loud and Radio Quiet AGN". In Multi-Wavelength Continuum Emission of AGN, 285–88. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_42.

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Akujor, Chidi E., R. W. Porcas, A. R. Patnaik e A. Ardeberg. "Optically Quiet Quasars — Radio and Optical Investigations". In Multi-Wavelength Continuum Emission of AGN, 419. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_129.

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Hughes, D. H., J. S. Dunlop, E. I. Robson e W. K. Gear. "Submillimetre Spectral Indices of Radio-Quiet Quasars". In Multi-Wavelength Continuum Emission of AGN, 324. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-010-9537-2_54.

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Calvani, M., J. W. Sulentic, P. Marziani, D. Dultzin-Hacyan e M. Moles. "A Possible Fundamental Difference Between Radio Loud and Radio Quiet AGN". In Extragalactic Radio Sources, 250–51. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0295-4_90.

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Capetti, Alessandro, e Barbara Balmaverde. "A New View of the Origin of the Radio-Quiet/Radio-Loud AGN Dichotomy?" In The Impact of HST on European Astronomy, 175–78. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3400-7_31.

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Sillanpää, A. "The Real Difference Between Radio-Loud and Radio-Quiet AGNs". In QSO Hosts and Their Environments, 59–60. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-0695-9_10.

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Trabalhos de conferências sobre o assunto "Radio-quiet AGN"

Brandt, W. N. "X-ray absorption in radio-quiet QSOS". In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434618.

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Vignali, C. "ASCA view on high-redshift radio-quiet quasars". In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434794.

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Mundell, Carole, N. Nagar e P. Ferruit. "Radio quiet AGN in the time domain - A new observational dimension". In 10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generation of radio arrays. Trieste, Italy: Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.125.0015.

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Panessa, Francesca, Loredana Bassani, Angela Bazzano, Geoffrey Bicknell, Paola Castangia, Marcello Giroletti, Elisabetta Maiorano, Angela Malizia, Andrea Tarchi e Pietro Ubertini. "On the origin of radio emission in Radio-Quiet AGN and their connection to X-rays". In 12th European VLBI Network Symposium and Users Meeting. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.230.0004.

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Orienti, Monica, Filippo D'Ammando, Marcello Giroletti, Gabriele Giovannini e Francesca Panessa. "The physics of the radio emission in the quiet side of the AGN population with the SKA". In Advancing Astrophysics with the Square Kilometre Array. Trieste, Italy: Sissa Medialab, 2015. http://dx.doi.org/10.22323/1.215.0087.

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VEILLEUX, S. "UNIFICATION OF RADIO-QUIET AGNS: SUCCESSES AND FAILURES". In Proceedings of the Guillermo Haro Conference 2003. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702432_0053.

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Tombesi, F., M. Cappi, J. N. Reeves, G. G. C. Palumbo, T. Yaqoob, V. Braito, M. Dadina, A. Comastri, L. Angelini e M. Cappi. "A search for relativistic outflows signatures in the X-ray spectra of radio-quiet AGNs". In X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Conference. AIP, 2010. http://dx.doi.org/10.1063/1.3475250.

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