Results 21 to 30 of about 72,254 (220)
The gravitational microlens influence on X-ray spectral line generated by an AGN accretion disc [PDF]
Serbian Astronomical Journal, 2001 The influence of gravitational microlensing on the X-ray spectral line profiles originated from a relativistic accretion disc has been studied. Using a disc model, we show that microlensing can induce noticeable changes in the line shapes when the ...
Popović L.Č. +4 more
doaj +1 more source
The mass accretion rate of galaxy clusters: a measurable quantity [PDF]
, 2016 We explore the possibility of measuring the mass accretion rate (MAR) of galaxy clusters from their mass profiles beyond the virial radius $R_{200}$. We derive the accretion rate from the mass of a spherical shell whose inner radius is $2R_{200}$, whose ...
Baldi, Marco +4 more
core +4 more sources
Using Cumulative Number Densities to Compare Galaxies across Cosmic Time [PDF]
, 2013 Comparing galaxies across redshifts at fixed cumulative number density is a popular way to estimate the evolution of specific galaxy populations. This method ignores scatter in mass accretion histories and galaxy-galaxy mergers, which can lead to errors ...
Behroozi, Peter +5 more
core +5 more sources
, 2016 We show how the interplay between active galactic nuclei (AGN) and merger history determines whether a galaxy quenches star formation at high redshift. We first simulate, in a full cosmological context, a galaxy of total dynamical mass $10^{12}\,M_{\odot}
Governato, Fabio +7 more
core +3 more sources
Discovery of a Low-redshift Hot Dust-obscured Galaxy
The Astrophysical Journal, 2023 We report the discovery of the hyperluminous, highly obscured active galactic nuclei (AGN) WISE J190445.04+485308.9 (W1904+4853, hereafter, L _bol ∼ 1.1 × 10 ^13 L _⊙ ) at z = 0.415.
Guodong Li +12 more
doaj +1 more source
Ongoing Galactic Accretion: Simulations and Observations of Condensed Gas in Hot Halos [PDF]
, 2007 Ongoing accretion onto galactic disks has been recently theorized to progress via the unstable cooling of the baryonic halo into condensed clouds. These clouds have been identified as analogous to the High-Velocity Clouds (HVCs) observed in HI in our ...
Braun R. +7 more
core +1 more source
Evidence for Recent Accretion in Nearby Galaxies [PDF]
The Astrophysical Journal, 1995 I discuss observations of magnitude residuals from the B-band Tully-Fisher relationship, B-V color, chemical abundance gradients, and asymmetries in the H I and stellar disks of nearby spiral galaxies within the context of a model in which small satellites or H I clouds are accreted onto the outer disks of spiral galaxies.
openaire +2 more sources
Spherical accretion in nearby weakly active galaxies [PDF]
Astronomy & Astrophysics, 2006 We consider the sample of weakly active galaxies situated in 'Local Universe' collected in the paper of Pellegrini (2005) with inferred accretion efficiencies from $10^{-2}$ to $10^{-7}$. We apply a model of spherically symmetrical Bondi accretion for given parameters ($M_{BH}$,$T_{\infty}$,$ _{\infty}$,) taken from observation.
openaire +2 more sources
Galaxy cluster mass accretion rates from IllustrisTNG [PDF]
Astronomy & Astrophysics, 2023 We used simulated cluster member galaxies from the TNG300-1 run of the IllustrisTNG simulations to develop a technique for measuring the galaxy cluster mass accretion rate (MAR) that can be applied directly to observations. We analyzed 1318 IllustrisTNG clusters of galaxies with M200c > 1014 M⊙ and 0.01 ≤ z ≤ 1.04.
Pizzardo, Michele +4 more
openaire +2 more sources
, 2017 One of the most active fields of research of modern-day astrophysics is that of massive black hole formation and co-evolution with the host galaxy.
Ciotti, L., Pellegrini, S.
core +1 more source