Results 61 to 70 of about 23,810 (131)
Gas accretion in disk galaxies
, 2013 Gas accretion is necessary to maintain star formation, spiral and bar structure, and secular evolution in galaxies. This can occur through tidal interaction, or mass accretion from cosmic filaments. Different processes will be reviewed to drive gas towards galaxy centers and trigger starbursts and AGN. The efficiency of these dynamical processes can be
openaire +2 more sources
Evidence of an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C 74.26 [PDF]
The Astrophysical Journal, 2005 4 pages, 2 figures, accepted by ApJ ...
Ballantyne, D. R., Fabian, A. C.
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The Astrophysical Journal, 2023 Observed breakBRD (“break bulges in red disks”) galaxies are a nearby sample of face-on disk galaxies with particularly centrally concentrated star formation: they have red disks but recent star formation in their centers as measured by the D _n 4000 ...
Stephanie Tonnesen +2 more
doaj +1 more source
In Search of Cool Flow Accretion onto Galaxies: Where Does the Disk Gas End? [PDF]
The Astrophysical Journal, 2017 Abstract The processes taking place in the outermost reaches of spiral disks (the “protodisk”) are intimately connected to the build-up of mass and angular momentum in galaxies. The thinness of spiral disks suggests that the activity is mostly quiescent, and presumably this region is fed by cool flows coming into the halo from the ...
Joss Bland-Hawthorn +4 more
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The Astrophysical Journal, 2023 Strong iron lines are a common feature of the optical spectra of active galactic nuclei (AGNs) and quasars from z ∼ 6−7 to the local universe, and [Fe/Mg] ratios do not show cosmic evolution.
Jian-Min Wang +8 more
doaj +1 more source
A Face-on Accretion Disk Geometry Revealed by Millimeter-wave Periodicity in Sgr A∗
The Astrophysical JournalWe analyzed 77 epochs of Atacama Large Millimeter/submillimeter Array archival data to investigate flux variability in Sagittarius A ^∗ , the supermassive black hole at the Galactic center.
Kazuki Yanagisawa +5 more
doaj +1 more source
Using Megamaser Disks to Probe Black Hole Accretion
, 2013 We examine the alignment between H_2O megamaser disks on sub-pc scales with circumnuclear disks and bars on 50 pc scales, in those galaxies for which radio continuum detections are available.
Braatz, James A. +9 more
core +1 more source
NGC 4138 - A Case Study in Counterrotating Disk Formation [PDF]
, 1996 The Sa(r) galaxy NGC 4138 has been recently found to contain an extensive counterrotating disk which appears to be still forming. Up to a third of the stars in the disk system may be on retrograde orbits.
Adrick H. Broeils +7 more
core +2 more sources
Astrophysics of Super-massive Black Hole Mergers [PDF]
, 2013 We present here an overview of recent work in the subject of astrophysical manifestations of super-massive black hole (SMBH) mergers. This is a field that has been traditionally driven by theoretical work, but in recent years has also generated a great ...
Schnittman, Jeremy D.
core +3 more sources
AT 2020nov: Evidence for Disk Reprocessing in a Rare Tidal Disruption Event
The Astrophysical JournalWe present a detailed analysis of AT 2020nov, a tidal disruption event (TDE) in the center of its host galaxy, located at a redshift of z = 0.083. AT 2020nov exhibits unique features, including double-peaked Balmer emission lines, a broad UV/optical ...
Nicholas Earl +24 more
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