The Low-luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
Misty C. Bentz,Kelly D. Denney,Catherine J. Grier,Aaron J. Barth,Bradley M. Peterson,Marianne Vestergaard,Marianne Vestergaard,Vardha N. Bennert,Gabriela Canalizo,Gisella De Rosa,Alexei V. Filippenko,Elinor L. Gates,Jenny E. Greene,Weidong Li,Matthew A. Malkan,Richard W. Pogge,Daniel Stern,Tommaso Treu,Jong-Hak Woo +18 more
TLDR
In this article, the authors present an updated and revised analysis of the relationship between the H{beta} broadline region (BLR) radius and the luminosity of the active galactic nucleus (AGN).Abstract:
We present an updated and revised analysis of the relationship between the H{beta} broad-line region (BLR) radius and the luminosity of the active galactic nucleus (AGN). Specifically, we have carried out two-dimensional surface brightness decompositions of the host galaxies of nine new AGNs imaged with the Hubble Space Telescope Wide Field Camera 3. The surface brightness decompositions allow us to create ''AGN-free'' images of the galaxies, from which we measure the starlight contribution to the optical luminosity measured through the ground-based spectroscopic aperture. We also incorporate 20 new reverberation-mapping measurements of the H{beta} time lag, which is assumed to yield the average H{beta} BLR radius. The final sample includes 41 AGNs covering four orders of magnitude in luminosity. The additions and updates incorporated here primarily affect the low-luminosity end of the R{sub BLR}-L relationship. The best fit to the relationship using a Bayesian analysis finds a slope of {alpha}= 0.533{sup +0.035}{sub -0.033}, consistent with previous work and with simple photoionization arguments. Only two AGNs appear to be outliers from the relationship, but both of them have monitoring light curves that raise doubt regarding the accuracy of their reported time lags. The scatter around the relationship is found to be 0.19more » {+-} 0.02 dex, but would be decreased to 0.13 dex by the removal of these two suspect measurements. A large fraction of the remaining scatter in the relationship is likely due to the inaccurate distances to the AGN host galaxies. Our results help support the possibility that the R{sub BLR}-L relationship could potentially be used to turn the BLRs of AGNs into standardizable candles. This would allow the cosmological expansion of the universe to be probed by a separate population of objects, and over a larger range of redshifts.« lessread more
Citations
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Black Hole - Galaxy Scaling Relationships for Active Galactic Nuclei with Reverberation Masses
TL;DR: In this article, the authors used high-resolution optical Hubble Space Telescope images and deep, ground-based near-infrared images to examine the host-galaxies of 37 active galactic nuclei with reverberation-based black hole masses.
Journal ArticleDOI
HST unveils a compact mildly relativistic broad-line region in the candidate true type 2 NGC 3147
Stefano Bianchi,Robert Antonucci,Alessandro Capetti,Marco Chiaberge,Marco Chiaberge,Ari Laor,Loredana Bassani,Francisco J. Carrera,Fabio La Franca,Andrea Marinucci,Giorgio Matt,R. Middei,Francesca Panessa +12 more
TL;DR: In this paper, the anonymous referee and H.O. Tran for the 2003 Keck spectrum of NGC 3147 were presented and the data described here may be obtained from the MAST archive at http://dx.doi.org/10.17909/t9-7vzv-2j06.
Journal ArticleDOI
The relativistic jet of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342.
Daniel Kynoch,Hermine Landt,Martin Ward,Chris Done,Emma Gardner,Catherine Boisson,Maialen Arrieta-Lobo,Andreas Zech,Katrien C. Steenbrugge,Miguel Pereira Santaella +9 more
TL;DR: In this article, the origin of the γ-ray emission in the lowest-redshift candidate among the currently known NLS1s, 1H 0323+342, was investigated using quasi-simultaneous near-infrared, optical and X-ray spectroscopy.
Journal ArticleDOI
Time-delay measurement of MgII broad line response for the highly-accreting quasar HE 0413-4031: Implications for the MgII-based radius-luminosity relation
Michal Zajaček,Bozena Czerny,Mary Loli Martínez-Aldama,Mateusz Rałowski,Aleksandra Olejak,Swayamtrupta Panda,Krzysztof Hryniewicz,Marzena Śniegowska,Mohammad-Hassan Naddaf,Wojtek Pych,Grzegorz Pietrzyński,C. Sobrino Figaredo,Martin Haas,Justyna Średzińska,Magdalena Krupa,Agnieszka Kurcz,Andrzej Udalski,Marek Górski,Marek J. Sarna +18 more
TL;DR: In this paper, the authors present the monitoring of the AGN continuum and MgII broad line emission for the quasar HE 0413-4031 ($z=1.38$) based on the six-year monitoring by the South African Large Telescope (SALT).
Journal ArticleDOI
Polarization of changing-look quasars
Damien Hutsemekers,B. Agís González,B. Agís González,Frédéric Marin,Dominique Sluse,C. Ramos Almeida,C. Ramos Almeida,J. A. Acosta Pulido,J. A. Acosta Pulido +8 more
TL;DR: In this paper, the authors show that the disappearance of broad emission lines observed in changing-look quasars cannot be attributed to dust obscuration, and support the scenario in which changes of look are caused by a change in the rate of accretion onto the supermassive black hole.
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