[HTML][HTML] Ultraluminous X-ray sources

A King, JP Lasota, M Middleton - New Astronomy Reviews, 2023 - Elsevier
The study of ultraluminous X-ray sources (ULXs) has changed dramatically over the last
decade. In this review we first describe the most important observations of ULXs in various …

Primordial black holes—perspectives in gravitational wave astronomy

M Sasaki, T Suyama, T Tanaka… - Classical and Quantum …, 2018 - iopscience.iop.org
This article reviews current understanding of primordial black holes (PBHs), with particular
focus on those massive examples ($\gtrsim $$10^{15}~{\rm g} $) which remain at the …

Evidence for heavy-seed origin of early supermassive black holes from a z ≈ 10 X-ray quasar

Á Bogdán, AD Goulding, P Natarajan, OE Kovács… - Nature …, 2024 - nature.com
Observations of quasars reveal that many supermassive black holes (BHs) were in place
less than 700 Myr after the Big Bang. However, the origin of the first BHs remains a mystery …

Improved constraints on the 21 cm EoR power spectrum and the X-ray heating of the IGM with HERA phase I observations

T Adams, JE Aguirre, P Alexander, ZS Ali… - The Astrophysical …, 2023 - iopscience.iop.org
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power
spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization …

Active galactic nuclei: what's in a name?

P Padovani, DM Alexander, RJ Assef… - The Astronomy and …, 2017 - Springer
Active galactic nuclei (AGN) are energetic astrophysical sources powered by accretion onto
supermassive black holes in galaxies, and present unique observational signatures that …

Ultraluminous X-ray sources

P Kaaret, H Feng, TP Roberts - Annual Review of Astronomy …, 2017 - annualreviews.org
We review observations of ultraluminous X-ray sources (ULXs). X-ray spectroscopic and
timing studies of ULXs suggest a new accretion state distinct from those seen in Galactic …

Obscured active galactic nuclei

RC Hickox, DM Alexander - Annual Review of Astronomy and …, 2018 - annualreviews.org
Active galactic nuclei (AGN) are powered by the accretion of material onto a supermassive
black hole (SMBH) and are among the most luminous objects in the Universe. However, the …

HERA phase I limits on the cosmic 21 cm signal: constraints on astrophysics and cosmology during the epoch of reionization

Z Abdurashidova, JE Aguirre, P Alexander… - The Astrophysical …, 2022 - iopscience.iop.org
Abstract Recently, the Hydrogen Epoch of Reionization Array (HERA) has produced the
experiment's first upper limits on the power spectrum of 21 cm fluctuations at z∼ 8 and 10 …

Radiation backgrounds at cosmic dawn: X-rays from compact binaries

P Madau, T Fragos - The Astrophysical Journal, 2017 - iopscience.iop.org
We compute the expected X-ray diffuse background and radiative feedback on the
intergalactic medium (IGM) from X-ray binaries prior to and during the epoch of reionization …

Inferring the astrophysics of reionization and cosmic dawn from galaxy luminosity functions and the 21-cm signal

J Park, A Mesinger, B Greig… - Monthly Notices of the …, 2019 - academic.oup.com
The properties of the first galaxies, expected to drive the Cosmic Dawn and the Epoch of
Reionization, are encoded in the 3D structure of the cosmic 21-cm signal. Parameter …