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http://hdl.handle.net/20.500.12386/30096
Title: | Quasars: From the Physics of Line Formation to Cosmology | Authors: | MARZIANI, Paola Bon, Edi Bon, Natasa del Olmo, Ascension Martínez-Aldama, Mary D'ONOFRIO, MAURO Dultzin, Deborah Negrete, C. STIRPE, Giovanna Maria |
Issue Date: | 2019 | Journal: | ATOMS | Number: | 7 | Issue: | 1 | First Page: | 18 | Abstract: | Quasars accreting matter at very high rates (known as extreme Population A [xA] or super-Eddington accreting massive black holes) provide a new class of distance indicators covering cosmic epochs from the present-day Universe up to less than 1 Gyr from the Big Bang. The very high accretion rate makes it possible that massive black holes hosted in xA quasars radiate at a stable, extreme luminosity-to-mass ratio. This in turns translates into stable physical and dynamical conditions of the mildly ionized gas in the quasar low-ionization line emitting region. In this contribution, we analyze the main optical and UV spectral properties of extreme Population A quasars that make them easily identifiable in large spectroscopic surveys at low-z (z < 1) and intermediate-z (2 < z < 2.6), and the physical conditions that are derived for the formation of their emission lines. Ultimately, the analysis supports the possibility of identifying a virial broadening estimator from low-ionization line widths, and the conceptual validity of the redshift-independent luminosity estimates based on virial broadening for a known luminosity-to-mass ratio. | URI: | http://hdl.handle.net/20.500.12386/30096 | URL: | https://www.mdpi.com/2218-2004/7/1/18 https://arxiv.org/abs/1901.10032 |
ISSN: | 2218-2004 | DOI: | 10.3390/atoms7010018 | Bibcode ADS: | 2019Atoms...7...18M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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1901.10032.pdf | postprint | 706.27 kB | Adobe PDF | View/Open |
atoms-07-00018-v2.pdf | Pdf editoriale | 688.26 kB | Adobe PDF | View/Open |
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