PROSPECTS FOR CONSTRAINING THE SPIN OF THE MASSIVE BLACK HOLE AT THE GALACTIC CENTER VIA THE RELATIVISTIC MOTION OF A SURROUNDING STAR

Nuclear activities in galaxies, such as nuclear starbursts or AGNs, are supposed to be induced by gas fueling into nuclear regions of galaxies. Non-axisymmetric gravitational potential caused by a stellar bar is a convincing mechanism for triggering gas fueling (Phinney 1994). However, numerical simulations have shown that the bar can not force the gas to accrete toward the galactic center beyond the inner Lindblad resonance (ILR). As a mechanism to overcome the ILR barrier, the double barred structure (Friedli & Martinet 1993), or the self-gravity of gas (Wada & Habe 1992, 1995; Elmegreen 1994) are proposed.

Download Full-text

Clarification of the formation process of the super massive black hole by Infrared astrometric satellite, Small-JASMINE

Proceedings of the International Astronomical Union ◽

10.1017/s1743921317005476 ◽

2017 ◽

Vol 12 (S330) ◽

pp. 360-361 ◽

Cited By ~ 1

Author(s):

Taihei Yano ◽

Keyword(s):

Black Holes ◽

Black Hole ◽

Phase Space ◽

Formation Process ◽

Near Infrared ◽

Galactic Center ◽

Space Distribution ◽

Massive Black Hole ◽

Phase Space Distribution ◽

Merging Process

AbstractSmall-JASMINE (hearafter SJ), infrared astrometric satellite, will measure the positions and the proper motions which are located around the Galactic center, by operating at near infrared wave-lengths. SJ will clarify the formation process of the super massive black hole (hearafter SMBH) at the Galactic center. In particular, SJ will determine whether the SMBH was formed by a sequential merging of multiple black holes. The clarification of this formation process of the SMBH will contribute to a better understanding of merging process of satellite galaxies into the Galaxy, which is suggested by the standard galaxy formation scenario. A numerical simulation (Tanikawa and Umemura, 2014) suggests that if the SMBH was formed by the merging process, then the dynamical friction caused by the black holes have influenced the phase space distribution of stars. The phase space distribution measured by SJ will make it possible to determine the occurrences of the merging process.

Download Full-text

Orbital In-spiral into a Massive Black Hole in a Galactic Center

The Astrophysical Journal ◽

10.1086/376672 ◽

2003 ◽

Vol 590 (1) ◽

pp. L29-L32 ◽

Cited By ~ 40

Author(s):

Tal Alexander ◽

Clovis Hopman

Keyword(s):

Black Hole ◽

Galactic Center ◽

Massive Black Hole

Download Full-text

The distance to the Galactic Center

Proceedings of the International Astronomical Union ◽

10.1017/s1743921312021060 ◽

2012 ◽

Vol 8 (S289) ◽

pp. 29-35 ◽

Cited By ~ 4

Author(s):

Stefan Gillessen ◽

Frank Eisenhauer ◽

Tobias K. Fritz ◽

Oliver Pfuhl ◽

Thomas Ott ◽

...

Keyword(s):

Black Hole ◽

Galactic Center ◽

Distance Estimate ◽

Massive Black Hole ◽

Geometric Distance ◽

Stellar Orbits ◽

Fundamental Parameters ◽

The Galaxy ◽

Error Bars ◽

Definition Of

AbstractOne of the Milky Way's fundamental parameters is the distance of the Sun from the Galactic Center, R0. This article reviews the various ways of estimating R0, placing special emphasis on methods that have become possible recently. In particular, we focus on the geometric distance estimate made possible thanks to observations of individual stellar orbits around the massive black hole at the center of the Galaxy. The specific issues of concern there are the degeneracies with other parameters, most importantly the mass of the black hole and the definition of the reference frame. The current uncertainty is nevertheless only a few percent, with error bars shrinking every year.

Download Full-text