Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes

Brandt, W. N.; Alexander, D. M.

doi:10.48550/arxiv.1501.01982

Cited by 3 publications

(2 citation statements)

References 302 publications

(410 reference statements)

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“…Since its discovery, a number of space-based observatories have studied the CXB, in the attempt to determine its origin. At present, it has been possible to resolve most of the CXB in the 0.5-10 keV band into discrete sources, many of which have been found to be active galactic nuclei (AGNs); for a review, see [88]. The unresolved cosmic X-ray background has been measured by a series of experiments and can be represented by different analytical fits (see [89]).…”

Section: Cosmic X-ray Backgroundmentioning

confidence: 99%

Axion-like particles from primordial black holes shining through the Universe

Schiavone¹,

Montanino

Mirizzi

et al. 2021

J. Cosmol. Astropart. Phys.

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We consider a cosmological scenario in which the very early Universe experienced a transient epoch of matter domination due to the formation of a large population of primordial black holes (PBHs) with masses M ≲ 109 g, that evaporate before Big Bang nucleosynthesis. In this context, Hawking radiation would be a non-thermal mechanism to produce a cosmic background of axion-like particles (ALPs). We assume the minimal scenario in which these ALPs couple only with photons. In the case of ultralight ALPs (m a ≲ 10-9 eV) the cosmic magnetic fields might trigger ALP-photon conversions, while for masses m a ≳ 10 eV spontaneous ALP decay in photon pairs would be effective. We investigate the impact of these mechanisms on the cosmic X-ray background, on the excess in X-ray luminosity in Galaxy Clusters, and on the process of cosmic reionization.

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Section: Cosmic X-ray Backgroundmentioning

confidence: 99%

Axion-like particles from primordial black holes shining through the Universe

Schiavone¹,

Montanino

Mirizzi

et al. 2021

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Since its discovery, a number of space-based observatories have studied the CXB, in the attempt to determine its origin. At present, it has been possible to resolve most of the CXB in the 0.5-10 keV band into discrete sources, many of which have been found to be active galactic nuclei (AGNs); for a review, see [78]. The unresolved cosmic X-ray background has been measured by a series of experiments and can be represented by different analytical fits (see [79]).…”

Section: Cosmic X-ray Backgroundmentioning

confidence: 99%

Axion-like particles from primordial black holes shining through the Universe

Schiavone,

Montanino,

Mirizzi

et al. 2021

Preprint

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We consider a cosmological scenario in which the very early Universe experienced a transient epoch of matter domination due to the formation of a large population of primordial black holes (PBHs) with masses M 10 9 g, that evaporate before Big Bang nucleosynthesis. In this context, Hawking radiation would be a non-thermal mechanism to produce a cosmic background of axion-like particles (ALPs). We assume the minimal scenario in which these ALPs couple only with photons. In the case of ultralight ALPs (m a 10 −9 eV) the cosmic magnetic fields might trigger ALP-photon conversions, while for masses m a 10 eV spontaneous ALP decay in photon pairs would be effective. We investigate the impact of these mechanisms on the cosmic X-ray background, on the excess in X-ray luminosity in Galaxy Clusters, and on the process of cosmic reionization.

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The incidence of AGN in galaxies with different stellar population ages

Aird

Merloni

et al. 2023

Monthly Notices of the Royal Astronomical Society

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It has been argued that recycled gas from stellar mass loss in galaxies might serve as an important fuelling source for black holes (BHs) in their centers. Utilizing spectroscopic samples of galaxies from the Sloan Digital Sky Survey (SDSS) at z = 0–0.35 and the Large Early Galaxy Astrophysics Census (LEGA-C) survey at z = 0.6–1 that have X-ray coverage from XMM-Newton or Chandra, we test this stellar mass loss fuelling scenario by investigating how AGN activity and BH growth vary with the break strength at 4000 Å, $\rm D_{n}4000$ (which is closely related to the age of stellar populations), as younger galaxies are considered to have higher stellar mass loss rates. We found that when controlling for host-galaxy properties, the fraction of log LX/M⋆ >32 (which roughly corresponds to Eddington ratios ≳ 1%) AGN and sample-averaged black hole accretion rate ($\rm \overline{BHAR}$) decrease with $\rm D_{n}4000$ among $\rm D_{n}4000$ ≲ 1.9 galaxies, suggesting a higher level of AGN activity among younger galaxies, which supports the stellar mass loss fuelling scenario. For the oldest and most massive galaxies at z = 0–0.35, this decreasing trend is not present anymore. We found that, among these most massive galaxies at low redshift, the fraction of low specific-accretion-rate (31 < log LX/M⋆ < 32) AGNs increases with $\rm D_{n}4000$, which may be associated with additional fuelling from hot halo gas and/or enhanced accretion capability.

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Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes

Cited by 3 publications

References 302 publications

Axion-like particles from primordial black holes shining through the Universe

Axion-like particles from primordial black holes shining through the Universe

Axion-like particles from primordial black holes shining through the Universe

The incidence of AGN in galaxies with different stellar population ages

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