Results 121 to 130 of about 235,164 (217)

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

Fresh Accretion Event in the Spiral Galaxy ESO 119-055

Through long-slit spectral observations of the early type disk galaxy ESO 119-055 and archival panoramic spectroscopy data, we studied the kinematics, excitation, and oxygen abundance of the ionized gas in the outer disk of the galaxy.
Olga K. Sil’chenko, Alexei Yu. Kniazev
core   +1 more source

A large population of overmassive black hole quasars at z=0.3-0.8 revealed by eROSITA

Astronomy & Astrophysics
In most galaxies, the central black hole accounts for no more than a percent of the total mass in stars. Recently, however, extremely overmassive black holes (OMBHs) with ratios of 10% have been reported in dwarf galaxies at z  5.5) by JWST.
Buchner Johannes, Gauger Isabelle, Wu Qiaoya, Starck Hattie, Aydar Catarina, Shen Yue, Bennert Vardha N., Nandra Kirpal, Waddell Sophia G. H., Merloni Andrea, Salvato Mara, Assef Roberto J., Igo Zsofi, Bauer Franz E., Kim Dong-Woo, Koekemoer Anton M., Schneider Donald P.   +16 more
doaj   +1 more source

The Role of Cluster Environments in Quiescent Galaxy Stellar Halo Assembly

The Astrophysical Journal
External interactions drive galaxy stellar mass growth and morphological evolution. As stellar halos—assembled largely via hierarchical accretion—preserve signatures of these processes, their growth probes how environment regulates galaxy evolution.
Devin J. Williams, Ivana Damjanov, Marcin Sawicki, Harrison Souchereau, Lingjian Chen, Guillaume Desprez, Angelo George, Stephen Gwyn, Stéphane Arnouts   +8 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

Accretion by the Galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 1980
openaire   +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

The visible environment of gas-accreting galaxies

, 1999
We studied the environment of a sample of galaxies in which the presence of polar rings or the presence of gas- and stars- counterrotation is observed. These galaxies are believed to have accreted this material, now in peculiar motion, from their environment.
Bettoni, D., Galletta, G., Prada, F.
openaire   +2 more sources

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