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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28952
Title: Extending virial black hole mass estimates to low-luminosity or obscured AGN: the cases of NGC 4395 and MCG -01-24-012
Authors: La Franca, F.
Onori, F.
Ricci, F.
Sani, E.
Brusa, M.
Maiolino, R.
Bianchi, S.
BONGIORNO, ANGELA 
FIORE, Fabrizio 
Marconi, Alessandro 
Vignali, C.
Issue Date: 2015
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 449
Issue: 2
First Page: 1526
Abstract: In the last decade, using single epoch (SE) virial based spectroscopic optical observations, it has been possible to measure the black hole (BH) mass on large type 1 active galactic nuclei (AGN) samples. However this kind of measurements cannot be applied on those obscured type 2 and/or low-luminosity AGN where the nuclear component does not dominate in the optical. We have derived new SE relationships, based on the full width at half-maximum and luminosity of the broad-line region component of the Paβ emission line and/or the hard X-ray luminosity in the 14-195 keV band, which have the prospect of better working with low luminosity or obscured AGN. The SE relationships have been calibrated in the 10<SUP>5</SUP>-10<SUP>9</SUP> M<SUB>☉</SUB> mass range, using a sample of AGN, whose BH masses have been previously measured using reverberation mapping techniques. Our tightest relationship between the reverberation-based BH mass and the SE virial product has an intrinsic spread of 0.20 dex. Thanks to these SE relations, in agreement with previous estimates, we have measured a BH mass of M_BH = 1.7^{+1.3}_{-0.7} × 10^5 M<SUB>☉</SUB> for the low luminosity, type 1, AGN NGC 4395 (one of the smallest active galactic BH known). We also measured, for the first time, a BH mass of M_BH = 1.5^{+1.1}_{-0.6} × 10^7 M<SUB>☉</SUB> for the Seyfert 2 galaxy MCG -01-24-012.
Acknowledgments: We thank the referee for her/his very useful comments which improved the manuscript. Based on observations made with ESO telescopes at the Paranal Observatory and the Large Binocular Telescope (LBT) at Mt. Graham, Arizona. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are: The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University; and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota, and University of Virginia. We thank for the very efficient service observing mode operation management at LBT and the ESO staff at Paranal and Garching for their support during the preparation and execution of the observations. MB acknowledges support from the FP7 Career Integration Grant ‘eEASy’ (CIG 321913). We acknowledge funding from PRIN-MIUR 2010 award 2010NHBSBE and from PRIN-INAF 2011 ‘BH growth and AGN feedback through the cosmic time’.
URI: http://hdl.handle.net/20.500.12386/28952
URL: https://academic.oup.com/mnras/article/449/2/1526/1074457
ISSN: 0035-8711
DOI: 10.1093/mnras/stv368
Bibcode ADS: 2015MNRAS.449.1526L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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