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Journal articles on the topic 'Reverberation mapping'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Fine, S., T. Shanks, P. Green, B. C. Kelly, S. M. Croom, R. L. Webster, E. Berger, et al. "Stacked reverberation mapping." Monthly Notices of the Royal Astronomical Society: Letters 434, no. 1 (June 12, 2013): L16—L20. http://dx.doi.org/10.1093/mnrasl/slt069.

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2

Brewer, Brendon J., and Tom M. Elliott. "Hierarchical reverberation mapping." Monthly Notices of the Royal Astronomical Society: Letters 439, no. 1 (January 16, 2014): L31—L35. http://dx.doi.org/10.1093/mnrasl/slt174.

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3

Shen, Yue. "ASTROMETRIC REVERBERATION MAPPING." Astrophysical Journal 757, no. 2 (September 12, 2012): 152. http://dx.doi.org/10.1088/0004-637x/757/2/152.

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4

Fine, S., T. Shanks, S. M. Croom, P. Green, B. C. Kelly, E. Berger, R. Chornock, W. S. Burgett, E. A. Magnier, and P. A. Price. "Composite reverberation mapping." Monthly Notices of the Royal Astronomical Society 427, no. 4 (December 21, 2012): 2701–10. http://dx.doi.org/10.1111/j.1365-2966.2012.21248.x.

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5

Peterson, Bradley M. "Space Telescope and Optical Reverberation Mapping Project: A Leap Forward in Reverberation Mapping." Proceedings of the International Astronomical Union 12, S324 (September 2016): 215–18. http://dx.doi.org/10.1017/s1743921316012680.

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AbstractIn 2014, a 179-orbit allocation of Hubble Space Telescope time anchored a massive reverberation-mapping program on the well-studied Seyfert 1 galaxy NGC 5548. Supporting imaging and spectrophotometric observations were provided by Swift, Chandra, Spitzer, and a world-wide network of ground-based telescopes. Understanding the data remains a significant challenge, partly because the level of detail is far beyond what has been seen before and partly because the behavior of the AGN was not typical of its past behavior. Based on analysis to date, the following conclusions can be reached: (1) the AGN accretion disk has a temperature profile that is consistent with that predicted by the Shakura–Sunyaev model, but is about three times larger than expected; (2) at least part of the broad-line region appears to be a Keplerian disk seen at intermediate inclination, and (3) the broad-line emission response from the far side of the disk is weaker than expected.

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6

Peterson, Bradley M. "Reverberation mapping of active nuclei." Advances in Space Research 21, no. 1-2 (January 1998): 57–66. http://dx.doi.org/10.1016/s0273-1177(97)00614-5.

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7

Yu, Z., C. S. Kochanek, B. M. Peterson, Y. Zu, W. N. Brandt, E. M. Cackett, M. M. Fausnaugh, and I. M. McHardy. "On reverberation mapping lag uncertainties." Monthly Notices of the Royal Astronomical Society 491, no. 4 (December 11, 2019): 6045–64. http://dx.doi.org/10.1093/mnras/stz3464.

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ABSTRACT We broadly explore the effects of systematic errors on reverberation mapping lag uncertainty estimates from javelin and the interpolated cross-correlation function (ICCF) method. We focus on simulated light curves from random realizations of the light curves of five intensively monitored AGNs. Both methods generally work well even in the presence of systematic errors, although javelin generally provides better error estimates. Poorly estimated light-curve uncertainties have less effect on the ICCF method because, unlike javelin , it does not explicitly assume Gaussian statistics. Neither method is sensitive to changes in the stochastic process driving the continuum or the transfer function relating the line light curve to the continuum. The only systematic error we considered that causes significant problems is if the line light curve is not a smoothed and shifted version of the continuum light curve but instead contains some additional sources of variability.

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8

Mastroserio, Guglielmo, Adam Ingram, and Michiel van der Klis. "Multi-timescale reverberation mapping of Mrk 335." Monthly Notices of the Royal Astronomical Society 498, no. 4 (September 10, 2020): 4971–82. http://dx.doi.org/10.1093/mnras/staa2735.

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ABSTRACT Time lags due to X-ray reverberation have been detected in several Seyfert galaxies. The different traveltime between reflected and directly observed rays naturally causes this type of lag, which depends directly on the light-crossing time-scale of the system and hence scales with the mass of the central black hole. Featureless ‘hard lags’ not associated with reverberation, and often interpreted as propagating mass accretion rate fluctuations, dominate the longer time-scale variability. Here we fit our reltrans model simultaneously to the time-averaged energy spectrum and the lag-energy spectra of the Seyfert galaxy Mrk 335 over two time-scales (Fourier frequency ranges). We model the hard lags as fluctuations in the slope and strength of the illuminating spectrum, and self-consistently account for the effects that these fluctuations have on the reverberation lags. The resulting mass estimate is $1.1^{+2.0}_{-0.7} \times 10^6~\mathrm{ M}_\odot$, which is significantly lower than the mass measured with the optical reverberation mapping technique (14–26 million M⊙). When we add the correlated variability amplitudes to the time lags by fitting the full complex cross-spectra, the model is unable to describe the characteristic reverberation Fe K α line and cannot constrain the black hole mass. This may be due to the assumption that the direct radiation is emitted by a point-like source.

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9

Denney, Kelly D., B. M. Peterson, R. W. Pogge, M. C. Bentz, C. M. Gaskell, T. Minezaki, C. A. Onken, S. G. Sergeev, and M. Vestergaard. "Reverberation Mapping Results from MDM Observatory." Proceedings of the International Astronomical Union 5, S267 (August 2009): 201. http://dx.doi.org/10.1017/s1743921310006216.

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Reverberation mapping takes advantage of the presence of a time delay or lag, τ, between continuum and emission line flux variations observed through spectroscopic monitoring campaigns to infer the radius of the broad-line region (BLR) and, subsequently, the central black hole mass in type 1 AGNs. We present results from a multi-month reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from around the world. We measure BLR radii and black hole masses for six objects. The primary goal of this campaign was to obtain either new or improved Hβ reverberation lag measurements for several relatively low-luminosity AGNs. Using cross correlation techniques to measure the time delay between the mean optical continuum flux density around 5100 Å and the integrated Hβ flux, we determine the Hβ lags and black hole mass measurements listed in columns 2 and 3 of Table 1, respectively. Column 4 tells if this measurement is new, an improvement meant to replace a previous, less reliable measurement, or simply an additional measurement not used to replace a previous value. The complete results from this study are currently being prepared for publication. A subsequent velocity-resolved analysis of the Hβ response shows that three of the six primary targets demonstrate kinematic signatures (column 5) of infall, outflow, and non-radial virialized motions (see Denney et al. 2009).

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10

Peterson, Bradley M., and Misty C. Bentz. "Black hole masses from reverberation mapping." New Astronomy Reviews 50, no. 9-10 (November 2006): 796–99. http://dx.doi.org/10.1016/j.newar.2006.06.062.

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11

Krolik, Julian H., and Christine Done. "Reverberation mapping by regularized linear inversion." Astrophysical Journal 440 (February 1995): 166. http://dx.doi.org/10.1086/175258.

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12

Peterson, Bradley M. "Reverberation mapping of active galactic nuclei." Publications of the Astronomical Society of the Pacific 105 (March 1993): 247. http://dx.doi.org/10.1086/133140.

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13

Valenti, S., D. J. Sand, A. J. Barth, K. Horne, T. Treu, L. Raganit, T. Boroson, et al. "ROBOTIC REVERBERATION MAPPING OF ARP 151." Astrophysical Journal 813, no. 2 (November 5, 2015): L36. http://dx.doi.org/10.1088/2041-8205/813/2/l36.

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14

Pozo Nuñez, F., M. Ramolla, C. Westhues, C. Bruckmann, M. Haas, R. Chini, K. Steenbrugge, and M. Murphy. "Photometric reverberation mapping of 3C 120." Astronomy & Astrophysics 545 (September 2012): A84. http://dx.doi.org/10.1051/0004-6361/201219107.

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15

Young, A. J., and C. S. Reynolds. "Iron Line Reverberation Mapping withConstellation‐X." Astrophysical Journal 529, no. 1 (January 20, 2000): 101–8. http://dx.doi.org/10.1086/308236.

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16

Read, S. C., D. J. B. Smith, M. J. Jarvis, and G. Gürkan. "The performance of photometric reverberation mapping at high redshift and the reliability of damped random walk models." Monthly Notices of the Royal Astronomical Society 492, no. 3 (December 20, 2019): 3940–59. http://dx.doi.org/10.1093/mnras/stz3574.

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ABSTRACT Accurate methods for reverberation mapping using photometry are highly sought after since they are inherently less resource intensive than spectroscopic techniques. However, the effectiveness of photometric reverberation mapping for estimating black hole masses is sparsely investigated at redshifts higher than z ≈ 0.04. Furthermore, photometric methods frequently assume a damped random walk (DRW) model, which may not be universally applicable. We perform photometric reverberation mapping using the javelin photometric DRW model for the QSO SDSS-J144645.44+625304.0 at z = 0.351 and estimate the Hβ lag of $65^{+6}_{-1}$ d and black hole mass of $10^{8.22^{+0.13}_{-0.15}}\, \mathrm{M_{\odot }}$. An analysis of the reliability of photometric reverberation mapping, conducted using many thousands of simulated CARMA process light curves, shows that we can recover the input lag to within 6 per cent on average given our target’s observed signal-to-noise of >20 and average cadence of 14 d (even when DRW is not applicable). Furthermore, we use our suite of simulated light curves to deconvolve aliases and artefacts from our QSO’s posterior probability distribution, increasing the signal-to-noise on the lag by a factor of ∼2.2. We exceed the signal-to-noise of the Sloan Digital Sky Survey Reverberation Mapping Project (SDSS-RM) campaign with a quarter of the observing time per object, resulting in a ∼200 per cent increase in signal-to-noise efficiency over SDSS-RM.

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17

Anderson, M. D., F. Baron, and M. C. Bentz. "TLDR: time lag/delay reconstructor." Monthly Notices of the Royal Astronomical Society 505, no. 2 (May 19, 2021): 2903–12. http://dx.doi.org/10.1093/mnras/stab1394.

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ABSTRACT We present the time lag/delay reconstructor (TLDR), an algorithm for reconstructing velocity delay maps in the maximum a posteriori framework for reverberation mapping. Reverberation mapping is a tomographical method for studying the kinematics and geometry of the broad-line region of active galactic nuclei at high spatial resolution. Leveraging modern image reconstruction techniques, including total variation and compressed sensing, TLDR applies multiple regularization schemes to reconstruct velocity delay maps using the alternating direction method of multipliers. Along with the detailed description of the TLDR algorithm we present test reconstructions from TLDR applied to synthetic reverberation mapping spectra as well as a preliminary reconstruction of the Hβ feature of Arp 151 from the 2008 Lick Active Galactic Nuclei Monitoring Project.

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18

Maoz, D. "Reverberation Mapping and Broad-Line Region Models." International Astronomical Union Colloquium 159 (1997): 138–45. http://dx.doi.org/10.1017/s025292110003983x.

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19

Kaspi, Shai. "Recent results of measuring black hole masses via reverberation mapping." Proceedings of the International Astronomical Union 15, S356 (October 2019): 116–21. http://dx.doi.org/10.1017/s1743921320002707.

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AbstractOver the past three decades more than 100 Active Galactic Nuclei (AGNs) were measured using the reverberation mapping technique. This technique uses the response of the line emission in the Broad Line Region (BLR) to continuum emission variation and yields a measure for the distance of the BLR from the central Black Hole (BH). This in turn is used to measure the BH’s mass. Almost all of these measurements are of low-luminosity AGNs while for quasars with luminosities higher than 1046 rg s−1 there are hardly any attempts of reverberation mapping. This contribution reports on recent results from a two-decades campaigns to measure the BH mass in high-luminosity quasars using the reverberation mapping technique. BLR distance from the BH, BH mass, and AGN UV luminosity relations over eight orders of magnitude in luminosity are presented, pushing the luminosity limit to the highest point so far.

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20

Starkey, D., Keith Horne, M. M. Fausnaugh, B. M. Peterson, M. C. Bentz, C. S. Kochanek, K. D. Denney, et al. "SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS FOR NGC 5548." Astrophysical Journal 835, no. 1 (January 18, 2017): 65. http://dx.doi.org/10.3847/1538-4357/835/1/65.

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21

Schifter, Deborah E., Edward R. Franchi, James M. Griffin, and Budd B. Adams. "Reverberation mapping for basin‐wide bathymetric surveys." Marine Geodesy 10, no. 1 (January 1986): 1–33. http://dx.doi.org/10.1080/01490418609388008.

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22

Rojas Lobos, P. A., R. W. Goosmann, J. M. Hameury, and F. Marin. "Reverberation mapping of AGNs through continuum polarization." Astronomy & Astrophysics 637 (May 2020): A88. http://dx.doi.org/10.1051/0004-6361/202037814.

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Context. The size and geometry of the broad-line region (BLR) in active galactic nuclei (AGNs) are among the main ingredients in determining the mass of the accreting black hole. Size and geometry can be constrained by determining the delay between the optical continuum and the flux reprocessed by the BLR, in particular, through the emission lines. Aims. We propose here that the delay between polarized and unpolarized light can also be used in much the same way to constrain the size of the BLR; we verify that meaningful results can be expected from observations using this technique. Methods. We used our code STOKES to simulate polarized radiative transfer. We determined the response of the environment of the central source (BLR, dust torus, and polar wind) to randomly generated fluctuations in the central source. We then calculated the cross correlation between the simulated polarized flux and the total flux to estimate the time delay that would be provided by observations using the same method. Results. The BLR is the main contributor to the delay between the polarized flux and the total flux. This delay is independent of the observation wavelength. Conclusions. This validates the use of polarized radiation in the optical/UV band to estimate the geometrical properties of the BLR in type I AGNs, in which the viewing angle is close to pole-on and the BLR is not obscured by the dust torus.

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23

Edri, Haim, Stephen E. Rafter, Doron Chelouche, Shai Kaspi, and Ehud Behar. "BROADBAND PHOTOMETRIC REVERBERATION MAPPING OF NGC 4395." Astrophysical Journal 756, no. 1 (August 17, 2012): 73. http://dx.doi.org/10.1088/0004-637x/756/1/73.

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24

Pei, Liuyi, Aaron J. Barth, Greg S. Aldering, Michael M. Briley, Carla J. Carroll, Daniel J. Carson, S. Bradley Cenko, et al. "REVERBERATION MAPPING OF THEKEPLERFIELD AGN KA1858+4850." Astrophysical Journal 795, no. 1 (October 10, 2014): 38. http://dx.doi.org/10.1088/0004-637x/795/1/38.

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25

Horne, Keith, Bradley M. Peterson, Stefan J. Collier, and Hagai Netzer. "Observational Requirements for High‐Fidelity Reverberation Mapping." Publications of the Astronomical Society of the Pacific 116, no. 819 (May 2004): 465–76. http://dx.doi.org/10.1086/420755.

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26

Gaskell, C. Martin. "Accurate AGN Black Hole Masses and the Scatter in the MBH–Lbulge Relationship." Proceedings of the International Astronomical Union 5, S267 (August 2009): 203. http://dx.doi.org/10.1017/s174392131000623x.

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AbstractA new empirical formulae is given for estimating the masses of black holes in AGNs from the Hβ velocity dispersion and the continuum luminosity at 5100 Å. It is calibrated to reverberation-mapping and stellar-dynamical estimates of black hole masses. The resulting mass estimates are as accurate as reverberation-mapping and stellar-dynamical estimates. The new mass estimates show that there is very little scatter in the MBH–Lbulge relationship for high-luminosity galaxies, and that the scatter increases substantially in lower-mass galaxies.

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27

Lira, Paulina, Shai Kaspi, Hagai Netzer, Ismael Botti, Nidia Morrell, Julián Mejía-Restrepo, Paula Sánchez-Sáez, Jorge Martínez-Palomera, and Paula López. "Reverberation Mapping of Luminous Quasars at High z." Astrophysical Journal 865, no. 1 (September 20, 2018): 56. http://dx.doi.org/10.3847/1538-4357/aada45.

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28

Pancoast, Anna, Brendon J. Brewer, and Tommaso Treu. "GEOMETRIC AND DYNAMICAL MODELS OF REVERBERATION MAPPING DATA." Astrophysical Journal 730, no. 2 (March 15, 2011): 139. http://dx.doi.org/10.1088/0004-637x/730/2/139.

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29

Kaspi, Shai, W. N. Brandt, Dan Maoz, Hagai Netzer, Donald P. Schneider, and Ohad Shemmer. "Reverberation Mapping of High‐Luminosity Quasars: First Results." Astrophysical Journal 659, no. 2 (April 20, 2007): 997–1007. http://dx.doi.org/10.1086/512094.

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30

Netzer, Hagai. "Testing broad-line region models with reverberation mapping." Monthly Notices of the Royal Astronomical Society 494, no. 2 (March 19, 2020): 1611–21. http://dx.doi.org/10.1093/mnras/staa767.

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ABSTRACT New reverberation mapping (RM) measurements, combined with accurate luminosities and line ratios, provide strong constraints on the location of the line emitting gas in the broad-line region (BLR) of active galactic nuclei (AGNs). In this paper, I present new calculations of radiation pressure and magnetic pressure confined clouds and apply them to a ‘generic AGN’ and to NGC 5548. The new calculations are in good agreement with the observed lags of all broad emission lines, and with the luminosities of Ly α, C iv 1549, O vi 1035, and He ii 1640. They are also in reasonable agreement with the luminosities of Mg ii 2798 and the 1990 Å blend of C iii] and Si iii] lines for high-metallicity gas. They explain the changes in time-lag following an increase in continuum luminosity and their dependencies on the inner and outer boundaries of the BLR. They also predict very strong Balmer and Paschen continua with important implications to continuum RM experiments. However, the calculated Balmer and Paschen line luminosities are too weak, by factors of 2–5. This ‘Balmer line crisis’ was noted in several earlier works and is now confirmed and constrained by RM measurements that were not available in the past. It seems that present photoionization codes that use the escape probability formalism fail to correctly compute the Balmer line luminosities in high-density, large optical depth gas.

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31

Grier, C. J., B. M. Peterson, R. W. Pogge, K. D. Denney, M. C. Bentz, Paul Martini, S. G. Sergeev, et al. "REVERBERATION MAPPING RESULTS FOR FIVE SEYFERT 1 GALAXIES." Astrophysical Journal 755, no. 1 (July 26, 2012): 60. http://dx.doi.org/10.1088/0004-637x/755/1/60.

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32

King, Anthea L., Paul Martini, Tamara M. Davis, K. D. Denney, C. S. Kochanek, Bradley M. Peterson, Andreas Skielboe, et al. "Simulations of the OzDES AGN reverberation mapping project." Monthly Notices of the Royal Astronomical Society 453, no. 2 (August 26, 2015): 1701–26. http://dx.doi.org/10.1093/mnras/stv1718.

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33

Kaspi, Shai. "Studying the outskirts of reverberation mapped AGNs." Proceedings of the International Astronomical Union 12, S324 (September 2016): 219–22. http://dx.doi.org/10.1017/s1743921316013107.

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AbstractAbout 100 AGNs have their black hole mass measured directly using the reverberation mapping technique over the past few decades. By now we have high enough numbers to explore unique subsamples within these objects and to study phenomena across variety of AGNs. I will review recent reverberation mapping studies which focus on high-redshift high-luminosity AGNs and on AGNs with super-Eddington accreting massive black holes. These studies enable to investigate the BLR size, mass, and luminosity relations in different subsamples of AGNs and to check whether there are differences in these relations in different types of AGNs. In particular I will discuss the following questions: Is the BLR size - luminosity relation the same over the whole AGNs luminosity range? Are there different relations for different types of AGNs? What are these studies teaching us about theory of accretion into black holes in AGNs?

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34

Bentz, Misty C., Rachel Street, Christopher A. Onken, and Monica Valluri. "Robotic Reverberation Mapping of the Southern Seyfert NGC 3783." Astrophysical Journal 906, no. 1 (January 6, 2021): 50. http://dx.doi.org/10.3847/1538-4357/abccd4.

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35

Pongsupa, G., U. Sawangwit, S. Wannawichian, M. Boonmalai, and R. Yoyponsan. "TNT photometric reverberation mapping analysis of high-redshift quasars." Journal of Physics: Conference Series 1380 (November 2019): 012135. http://dx.doi.org/10.1088/1742-6596/1380/1/012135.

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36

Pozo Nuñez, F., M. Haas, R. Chini, M. Ramolla, C. Westhues, K. Steenbrugge, L. Kaderhandt, H. Drass, R. Lemke, and M. Murphy. "Dust reverberation-mapping of the Seyfert 1 galaxy WPVS48." Astronomy & Astrophysics 561 (January 2014): L8. http://dx.doi.org/10.1051/0004-6361/201323178.

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37

Peterson, B. M., C. J. Grier, Keith Horne, R. W. Pogge, M. C. Bentz, G. De Rosa, K. D. Denney, et al. "REVERBERATION MAPPING OF THE SEYFERT 1 GALAXY NGC 7469." Astrophysical Journal 795, no. 2 (October 23, 2014): 149. http://dx.doi.org/10.1088/0004-637x/795/2/149.

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38

Goicoechea, L. J., V. N. Shalyapin, R. Gil-Merino, and V. F. Braga. "Continuum reverberation mapping in az= 1.41 radio-loud quasar." Journal of Physics: Conference Series 372 (July 30, 2012): 012058. http://dx.doi.org/10.1088/1742-6596/372/1/012058.

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39

Bentz, Misty C. "New Reverberation Mapping Results from the Lick AGN Monitoring Project." Proceedings of the International Astronomical Union 5, S267 (August 2009): 197. http://dx.doi.org/10.1017/s1743921310006174.

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AbstractEight new black hole masses have been derived from a recent reverberation-mapping experiment carried out at Lick Observatory. The masses lie in the range ~ 106–107M⊙ and will allow us to extend the low end of AGN scaling relationships by a factor of ~10.

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40

Peterson, Bradley M. "Toward Precision Measurement of Central Black Hole Masses." Proceedings of the International Astronomical Union 5, S267 (August 2009): 151–60. http://dx.doi.org/10.1017/s1743921310006095.

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AbstractWe review briefly direct and indirect methods of measuring the masses of black holes in galactic nuclei, and then focus attention on supermassive black holes in active nuclei, with special attention to results from reverberation mapping and their limitations. We find that the intrinsic scatter in the relationship between the AGN luminosity and the broad-line region size is very small, ~0.11 dex, comparable to the uncertainties in the better reverberation measurements. We also find that the relationship between reverberation-based black hole masses and host-galaxy bulge luminosities also seems to have surprisingly little intrinsic scatter, ~0.17 dex. We note, however, that there are still potential systematics that could affect the overall mass calibration at the level of a factor of a few.

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41

Bond, Howard E., Misty C. Bentz, Geoffrey C. Clayton, and Armin Rest. "Light Echoes." Proceedings of the International Astronomical Union 7, S285 (September 2011): 215–20. http://dx.doi.org/10.1017/s1743921312000622.

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AbstractThe first “light echo”—scattered light from a stellar outburst arriving at the Earth months or years after the direct light from the event—was detected more than 100 years ago, around Nova Persei 1901. Renewed interest in light echoes has come from the spectacular echo around V838 Monocerotis, and from discoveries of light echoes from historical and prehistorical supernovæ in the Milky Way and Large Magellanic Cloud as well as from the 19th-century Great Eruption of η Carinae. A related technique is reverberation mapping of active galactic nuclei. This report of a workshop on Light Echoes gives an introduction to light echoes, and summarizes presentations on discoveries of light echoes from historical and prehistorical events, light and shadow echoes around R CrB stars, and reverberation mapping.

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42

Botti, Ismael, Paulina Lira, Jorge Martinez, Hagai Netzer, and Shai Kaspi. "High redshift quasars monitoring campaign." Proceedings of the International Astronomical Union 9, S304 (October 2013): 409–10. http://dx.doi.org/10.1017/s1743921314004438.

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AbstractWe present an update of the monitoring campaign we have undertaken to probe the most massive black holes in powerful quasars at high redshift through the reverberation mapping technique. Once this campaign has finished, we will be able to directly measure broad line region (BLR) sizes of quasars at z ~ 2−3, improving dramatically the BLR size-luminosity relation, and therefore, black hole mass estimates based on this relationship. So far, we have identified a dozen highly variable sources suitable for future cross-correlation analysis and reverberation measurements.

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43

Noda, Hirofumi, Taiki Kawamuro, Mitsuru Kokubo, and Takeo Minezaki. "Dust reverberation mapping of type 2 AGN NGC 2110 realized with X-ray and 3–5 μm IR monitoring." Monthly Notices of the Royal Astronomical Society 495, no. 3 (May 20, 2020): 2921–29. http://dx.doi.org/10.1093/mnras/staa1376.

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ABSTRACT The dust reverberation mapping is one of powerful methods to investigate the structure of the dusty tori in active galactic nuclei (AGNs), and it has been performed on more than a hundred type 1 AGNs. However, no clear results have been reported on type 2 AGNs because their strong optical/UV extinction completely hides their accretion disc emission. Here, we focus on an X-ray-bright type 2 AGN, NGC 2110, and utilize 2–20 keV X-ray variation monitored by MAXI to trace disc emission, instead of optical/UV variation. Comparing it with light curves in the WISE infrared (IR) W1 band ($\lambda =3.4~\mu$m) and W2 band ($\lambda =4.6~\mu$m) with cross-correlation analyses, we found candidates of the dust reverberation time lag at ∼60, ∼130, and ∼1250 d between the X-ray flux variation and those of the IR bands. By examining the best-fitting X-ray and IR light curves with the derived time lags, we found that the time lag of ∼130 d is most favoured. With this time lag, the relation between the time lag and luminosity of NGC 2110 is consistent with those in type 1 AGNs, suggesting that the dust reverberation in NGC 2110 mainly originates in hot dust in the torus innermost region, the same as in type 1 AGNs. As demonstrated by the present study, X-ray and IR simultaneous monitoring can be a promising tool to perform the dust reverberation mapping on type 2 AGNs.

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Kim, Joonho, Myungshin Im, Changsu Choi, and Sungyong Hwang. "Medium-band Photometry Reverberation Mapping of Nearby Active Galactic Nuclei." Astrophysical Journal 884, no. 2 (October 15, 2019): 103. http://dx.doi.org/10.3847/1538-4357/ab40cd.

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De Rosa, G., M. M. Fausnaugh, C. J. Grier, B. M. Peterson, K. D. Denney, Keith Horne, M. C. Bentz, et al. "Velocity-resolved Reverberation Mapping of Five Bright Seyfert 1 Galaxies." Astrophysical Journal 866, no. 2 (October 22, 2018): 133. http://dx.doi.org/10.3847/1538-4357/aadd11.

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Edelson, R., J. Gelbord, E. Cackett, B. M. Peterson, K. Horne, A. J. Barth, D. A. Starkey, et al. "The First Swift Intensive AGN Accretion Disk Reverberation Mapping Survey." Astrophysical Journal 870, no. 2 (January 16, 2019): 123. http://dx.doi.org/10.3847/1538-4357/aaf3b4.

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Shen, Yue, Patrick B. Hall, Keith Horne, Guangtun Zhu, Ian McGreer, Torben Simm, Jonathan R. Trump, et al. "The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization." Astrophysical Journal Supplement Series 241, no. 2 (April 15, 2019): 34. http://dx.doi.org/10.3847/1538-4365/ab074f.

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Fausnaugh, M. M., C. J. Grier, M. C. Bentz, K. D. Denney, G. De Rosa, B. M. Peterson, C. S. Kochanek, et al. "Reverberation Mapping of Optical Emission Lines in Five Active Galaxies." Astrophysical Journal 840, no. 2 (May 12, 2017): 97. http://dx.doi.org/10.3847/1538-4357/aa6d52.

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Shen, Yue, W. N. Brandt, Kyle S. Dawson, Patrick B. Hall, Ian D. McGreer, Scott F. Anderson, Yuguang Chen, et al. "THE SLOAN DIGITAL SKY SURVEY REVERBERATION MAPPING PROJECT: TECHNICAL OVERVIEW." Astrophysical Journal Supplement Series 216, no. 1 (December 23, 2014): 4. http://dx.doi.org/10.1088/0067-0049/216/1/4.

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Feng, Hai-Cheng, H. T. Liu, J. M. Bai, Zi-Xu Yang, Chen Hu, Sha-Sha Li, Sen Yang, Kai-Xing Lu, and Ming Xiao. "Velocity-resolved Reverberation Mapping of Changing-look AGN NGC 2617." Astrophysical Journal 912, no. 2 (May 1, 2021): 92. http://dx.doi.org/10.3847/1538-4357/abefe0.

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