Cold Quasar Investigation: Comparing Star Formation Rates to Black Hole Growth

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	Mintz, Sasha, Coleman, Brandon, Kirkpatrick, Allison
Formato:	Preprint
Publicado:	2024
Materias:	Astrophysics of Galaxies
Acceso en línea:	Acceder al recurso
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author	Mintz, Sasha Coleman, Brandon Kirkpatrick, Allison
author_facet	Mintz, Sasha Coleman, Brandon Kirkpatrick, Allison
contents	Cold quasars are a rare population of luminous, unobscured quasars associated with host galaxies that have a high star formation rate. We aimed to study the host galaxies of sixty four of these cold quasars in order to probe how the supermassive black holes and host galaxies were coevolving. We compiled data from the XXL survey and crossmatched with the VHS, WISE, and HerMES surveys to obtain multiwavelength photometry spanning the Xray to the infrared and including optical spectroscopy. From the data, we calculated the supermassive black hole masses using broad emission from the magnesium II and hydrogen beta lines. We compared this with the stellar mass of the entire galaxy and find that the black holes are significantly more massive than would be predicted by local relations, indicating that the majority of black hole growth precedes the bulk of the the stellar mass formation. In addition to this, we created a spectral energy distribution for each galaxy to calculate the star formation rate. We compared the star formation rate with the black hole accretion rate and find that the stellar mass is rapidly increasing at a relative rate faster than the black hole growth, supporting the picture where the black hole grows first.
format	Preprint
id	arxiv_https___arxiv_org_abs_2403_07196
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Cold Quasar Investigation: Comparing Star Formation Rates to Black Hole Growth Mintz, Sasha Coleman, Brandon Kirkpatrick, Allison Astrophysics of Galaxies Cold quasars are a rare population of luminous, unobscured quasars associated with host galaxies that have a high star formation rate. We aimed to study the host galaxies of sixty four of these cold quasars in order to probe how the supermassive black holes and host galaxies were coevolving. We compiled data from the XXL survey and crossmatched with the VHS, WISE, and HerMES surveys to obtain multiwavelength photometry spanning the Xray to the infrared and including optical spectroscopy. From the data, we calculated the supermassive black hole masses using broad emission from the magnesium II and hydrogen beta lines. We compared this with the stellar mass of the entire galaxy and find that the black holes are significantly more massive than would be predicted by local relations, indicating that the majority of black hole growth precedes the bulk of the the stellar mass formation. In addition to this, we created a spectral energy distribution for each galaxy to calculate the star formation rate. We compared the star formation rate with the black hole accretion rate and find that the stellar mass is rapidly increasing at a relative rate faster than the black hole growth, supporting the picture where the black hole grows first.
title	Cold Quasar Investigation: Comparing Star Formation Rates to Black Hole Growth
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2403.07196

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