Quasar Black Hole Mass Estimates from High-Ionization Lines: Breaking a Taboo?
Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica (INAF), IT 35122 Padova, Italy
Instituto de Astrofisíca de Andalucía (IAA-CSIC), E-18008 Granada, Spain
Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM), México D.F. 04510, Mexico
Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia
Dipartimento di Fisica & Astronomia “Galileo Galilei”, Università di Padova, IT35122 Padova , Italy
Authors to whom correspondence should be addressed.
Academic Editor: Robert C. Forrey
Received: 31 August 2017 / Revised: 12 September 2017 / Accepted: 14 September 2017 / Published: 20 September 2017
Can high ionization lines such as CIV
1549 provide useful virial broadening estimators for computing the mass of the supermassive black holes that power the quasar phenomenon? The question has been dismissed by several workers as a rhetorical one because blue-shifted, non-virial emission associated with gas outflows is often prominent in CIV
1549 line profiles. In this contribution, we first summarize the evidence suggesting that the FWHM of low-ionization lines like H
2800 provide reliable virial broadening estimators over a broad range of luminosity. We confirm that the line widths of CIV
1549 is not immediately offering a virial broadening estimator equivalent to the width of low-ionization lines. However, capitalizing on the results of Coatman et al. (2016) and Sulentic et al. (2017), we suggest a correction to FWHM CIV
1549 for Eddington ratio and luminosity effects that, however, remains cumbersome to apply in practice. Intermediate ionization lines (IP ∼ 20–30 eV; AlIII
1860 and SiIII]
1892) may provide a better virial broadening estimator for high redshift quasars, but larger samples are needed to assess their reliability. Ultimately, they may be associated with the broad-line region radius estimated from the photoionization method introduced by Negrete et al. (2013) to obtain black hole mass estimates independent from scaling laws.
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Marziani, P.; Olmo, A.D.; Martínez-Aldama, M.L.; Dultzin, D.; Negrete, A.; Bon, E.; Bon, N.; D’Onofrio, M. Quasar Black Hole Mass Estimates from High-Ionization Lines: Breaking a Taboo? Atoms 2017, 5, 33.
Marziani P, Olmo AD, Martínez-Aldama ML, Dultzin D, Negrete A, Bon E, Bon N, D’Onofrio M. Quasar Black Hole Mass Estimates from High-Ionization Lines: Breaking a Taboo? Atoms. 2017; 5(3):33.
Marziani, Paola; Olmo, Ascensión D.; Martínez-Aldama, Mary L.; Dultzin, Deborah; Negrete, Alenka; Bon, Edi; Bon, Natasa; D’Onofrio, Mauro. 2017. "Quasar Black Hole Mass Estimates from High-Ionization Lines: Breaking a Taboo?" Atoms 5, no. 3: 33.
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