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The evolution of star formation in QSOs according to WISE

Published online by Cambridge University Press:  29 March 2021

K. A. Cutiva-Alvarez Open the ORCID record for K. A. Cutiva-Alvarez [Opens in a new window] ,
R. Coziol ,
J. P. Torres-Papaqui ,
H. Andernach  and
A. C. Robleto-Orús
K. A. Cutiva-Alvarez
Affiliation:
Depto. de Astronomía, DCNE, Universidad de Guanajuato, CP 36023, Gto., México email: kacutivaa@unal.edu.co
R. Coziol
Affiliation:
Depto. de Astronomía, DCNE, Universidad de Guanajuato, CP 36023, Gto., México email: kacutivaa@unal.edu.co
J. P. Torres-Papaqui
Affiliation:
Depto. de Astronomía, DCNE, Universidad de Guanajuato, CP 36023, Gto., México email: kacutivaa@unal.edu.co
H. Andernach
Affiliation:
Depto. de Astronomía, DCNE, Universidad de Guanajuato, CP 36023, Gto., México email: kacutivaa@unal.edu.co
A. C. Robleto-Orús
Affiliation:
Depto. de Astronomía, DCNE, Universidad de Guanajuato, CP 36023, Gto., México email: kacutivaa@unal.edu.co
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Abstract

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Using WISE data, we calibrated the W2-W3 colors in terms of star formation rates (SFRs) and applied this calibration to a sample of 1285 QSOs with the highest flux quality, covering a range in redshift from z ˜ 0.3 to z ˜ 3.8. According to our calibration, the SFR increases continuously, reaching a value at z ˜ 3.8 about 3 times higher on average than at lower redshift. This increase in SFR is accompanied by an increase of the BH mass by a factor 100 and a gradual increase of the mean Eddington ratio from 0.1 to 0.3 up to z ˜ 1.5 – 2.0, above which the ratio stays constant, despite a significant increase in BH mass. Therefore, QSOs at high redshifts have both more active BHs and higher levels of star formation activity.

Keywords

(galaxies:) quasars: generalinfrared: galaxiesgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 33 - 34
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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