Results 91 to 100 of about 1,399 (188)

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

The Cosmic Evolution of the Supermassive Black Hole Population: A Hybrid Observed Accretion and Simulated Mergers Approach

The Astrophysical Journal
Supermassive black holes (SMBHs) can grow through both accretion and mergers. It is still unclear how SMBHs evolve under these two channels from high redshifts to the SMBH population we observe in the local Universe.
Fan Zou, W. N. Brandt, Elena Gallo, Bin Luo, Qingling Ni, Yongquan Xue, Zhibo Yu   +6 more
doaj   +1 more source

Subhalos in Galaxy Clusters: Coherent Accretion and Internal Orbits

The Astrophysical Journal
Subhalo dynamics in galaxy cluster host halos govern the observed distribution and properties of cluster member galaxies. We use the IllustrisTNG simulation to investigate the accretion and orbits of subhalos found in cluster-size halos. We find that the
Chi Han, Kuan Wang, Camille Avestruz, Dhayaa Anbajagane   +3 more
doaj   +1 more source

Delayed and Fast-rising Radio Flares from an Optical and X-Ray-detected Tidal Disruption Event in the Center of a Dwarf Galaxy

The Astrophysical Journal Letters
AT 2018cqh is a unique tidal disruption event (TDE) discovered in a dwarf galaxy. Both the light-curve fitting and galaxy scaling relationships suggest a central black hole mass in the range of 5.9 < log M _BH / M _☉ < 6.4. The r-band peak luminosity is ∼
Fabao Zhang, Xinwen Shu, Lei Yang, Luming Sun, Zhumao Zhang, Yibo Wang, Guobin Mou, Xue-Guang Zhang, Tianyao Zhou, Fangkun Peng   +9 more
doaj   +1 more source

A Face-on Accretion Disk Geometry Revealed by Millimeter-wave Periodicity in Sgr A∗

The Astrophysical Journal
We 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, Tomoharu Oka, Ryo Ariyama, Kazuki Yanagihara, Yuhei Iwata, Mikiya M. Takahashi   +5 more
doaj   +1 more source

Evidence for Multiple Orbiting Hotspots in the 340 GHz Variability of Sgr A*

The Astrophysical Journal Letters
We analyzed 11 epochs of archival Atacama Large Millimeter/submillimeter Array (ALMA) data to investigate the flux density variability of Sgr A* at 340 GHz. In one epoch, the light curve exhibits two short-timescale components with characteristic periods
Kazuki Yanagisawa, Tomoharu Oka, Tatsuya Kotani, Ryo Ariyama, Kazuki Yanagihara, Yuhei Iwata   +5 more
doaj   +1 more source

Accretion by the Galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 1980
openaire   +1 more source

Mapping the Growth of Supermassive Black Holes as a Function of Galaxy Stellar Mass and Redshift

The Astrophysical Journal
The growth of supermassive black holes is strongly linked to their galaxies. It has been shown that the population mean black hole accretion rate ( $\overline{\mathrm{BHAR}}$ ) primarily correlates with the galaxy stellar mass ( M _⋆ ) and redshift for ...
Fan Zou, Zhibo Yu, W. N. Brandt, Hyungsuk Tak, Guang Yang, Qingling Ni   +5 more
doaj   +1 more source

A Splashback-like Feature of Central Galaxies in Galaxy Clusters

The Astrophysical Journal
We investigate a splashback-like feature in the outer region of central galaxies (CGs) in clusters. This feature is detected as a “dip” in the radial slope of the CG surface brightness, derived through the stacking of Dark Energy Survey data of over 4000
Yuanyuan Zhang, Susmita Adhikari, Louise O. V. Edwards, Jesse B. Golden-Marx, Ricardo L. C. Ogando, Eli S. Rykoff   +5 more
doaj   +1 more source

Outer Ionized Gas in Galaxy Group: Exchance Through Tidal Interaction or Accretion from Common Reservoirs?

Universe
To clarify the problem of outer cold gas accretion onto disk galaxies, we performed the panoramic spectroscopy of six compact galaxy groups to search for intergalactic gas flows.
Olga Sil’chenko, Alexei Moiseev, Alexandrina Smirnova, Yael Kosareva, Dmitry Oparin   +4 more
doaj   +1 more source