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The quasar main sequence and its potential for cosmology

Published online by Cambridge University Press:  29 January 2021

Paola Marziani ,
Deborah Dultzin ,
Ascensión del Olmo ,
Mauro D’Onofrio ,
José A. de Diego ,
Giovanna M. Stirpe ,
Edi Bon ,
Natasa Bon ,
Bożena Czerny  and
Jaime Perea
...Show all authors
Paola Marziani
Affiliation:
INAF, Osservatorio Astronomico di Padova, Italy email: paola.marziani@inaf.it
Deborah Dultzin
Affiliation:
Instituto de Astronom a, UNAM, Mexico
Ascensión del Olmo
Affiliation:
IAA (CSIC), Granada, Spain
Mauro D’Onofrio
Affiliation:
Università di Padova, Italy
José A. de Diego
Affiliation:
Instituto de Astronom a, UNAM, Mexico
Giovanna M. Stirpe
Affiliation:
INAF, OASS, Bologna, Italy
Edi Bon
Affiliation:
Belgrade Observatory, Serbia
Natasa Bon
Affiliation:
Belgrade Observatory, Serbia
Bożena Czerny
Affiliation:
Center For Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
Jaime Perea
Affiliation:
IAA (CSIC), Granada, Spain
Swayamtrupta Panda
Affiliation:
Center For Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, Poland
Mary Loli Martinez-Aldama
Affiliation:
IAA (CSIC), Granada, Spain Center For Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland
C. A. Negrete
Affiliation:
Instituto de Astronom a, UNAM, Mexico
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Abstract

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The main sequence offers a method for the systematization of quasar spectral properties. Extreme FeII emitters (or extreme Population A, xA) are believed to be sources accreting matter at very high rates. They are easily identifiable along the quasar main sequence, in large spectroscopic surveys over a broad redshift range. 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. After reviewing the basic interpretation of the main sequence, we report on the possibility of identifying virial broadening estimators from low-ionization line widths, and provide evidence of the conceptual validity of redshift-independent luminosities based on virial broadening for a known luminosity-to-mass ratio.

Keywords

quasars: generalquasars: emission linesline: profilescosmological parametersdistance scaledark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 66 - 71
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

Footnotes

†

AdO acknowledges financial support from the Spanish grants AYA2016-76682-C3-1-P and the “Center of Excellence Severo Ochoa” award for the IAA (SEV-2017-0709).

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