Results 161 to 170 of about 234,699 (281)

Supermassive Black Holes at the Center of Galaxies [PDF]

arXiv, 2005
This was my final paper for the AST 308 Galaxies class at Michigan State University. Using many sources I was able to compile a moderate amount of information concerning the evidence for, and the formation of Supermassive Black Holes.
arxiv  

High Proper‐Motion Stars in the Vicinity of Sagittarius A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy [PDF]

, 1998
A. M. Ghez, B. Klein, M. Morris, E. E. Becklin   +3 more
openalex   +1 more source

Emergence of cHz Quasiperiodic Oscillations from a Low-angular-momentum Flow onto a Supermassive Black Hole

The Astrophysical Journal Letters
Quasiperiodic oscillations (QPOs) are very common in black hole accretion systems that are seen from the modulations in luminosity. Many supermassive black hole sources (e.g., RE J1034+396, 1H 0707-495, MCG-6-30-15, 1ES 1927+654, Sgr A*) have been ...
Indu K. Dihingia, Yosuke Mizuno
doaj   +1 more source

Super-Eddington Accretion in Quasars

Universe
This review provides an observational perspective on the fundamental properties of super-Eddington accretion onto supermassive black holes in quasars.
Paola Marziani, Karla Garnica Luna, Alberto Floris, Ascensión del Olmo, Alice Deconto-Machado, Tania M. Buendia-Rios, C. Alenka Negrete, Deborah Dultzin   +7 more
doaj   +1 more source

Tidal disruption of stars by supermassive black holes: The X-ray view

EPJ Web of Conferences, 2012
The tidal disruption of stars by supermassive black holes produces luminous soft X-ray accretion flares in otherwise inactive galaxies. First events have been discovered in X-rays with the ROSAT observatory, and have more recently been detected with XMM ...
Komossa S.
doaj   +1 more source

Pair Plasma Production in a Force‐free Magnetosphere around a Supermassive Black Hole [PDF]

, 1998
Kouichi Hirotani, Isao Okamoto
openalex   +1 more source

Supermassive Black Holes in the Universe [PDF]

, 2004
In these lecture notes we will give a very basic introduction to supermassive black holes. We derive the basic luminosity expected for accretion and introduce the Eddington limit. Kinematical evidence for black holes in the centers of galaxies from optical and radio spectroscopy is discussed as well as the link between black holes and host galaxy ...
Andreas Brunthaler, Heino Falcke
openaire   +2 more sources

Supermassive Black Holes in Early-Type Galaxies: Relationship with Radio Emission and Constraints on the Black Hole Mass Function [PDF]

, 1998
A. Franceschini, S. Vercellone, A. C. Fabian   +2 more
openalex   +1 more source

Jets, accretion and spin in supermassive black holes [PDF]

arXiv
The theoretical model suggests that relativistic jets of AGN rely on the black hole spin and/or accretion. We study the relationship between jet, accretion, and spin using supermassive black hole samples with reliable spin of black holes. Our results are as follows: (1) There is a weak correlation between radio luminosity and the spin of black hole for
arxiv  

Machine Learning–based Search of High-redshift Quasars

The Astrophysical Journal Supplement Series
We present a machine learning search for high-redshift (5.0 < z < 6.5) quasars using the combined photometric data from the Dark Energy Spectroscopic Instrument (DESI) Imaging Legacy Surveys and the Wide-field Infrared Survey Explorer survey.
Guangping Ye, Huanian Zhang, Qingwen Wu
doaj   +1 more source