Flares of Sagittarius a* at Millimeter Wavelengths
| dc.creator | Miyazaki, Atsushi | |
| dc.creator | Tsutsumi, Takahiro | |
| dc.creator | Miyoshi, Makoto | |
| dc.creator | Tsuboi, Masato | |
| dc.creator | Shen, Zhi-Qiang | |
| dc.date | 2005-12-28 | |
| dc.date.accessioned | 2026-07-07T06:49:14Z | |
| dc.date.available | 2026-07-07T06:49:14Z | |
| dc.description | We have performed monitoring observations of the flux density toward the Galactic center compact radio source, Sagittarius A* (Sgr A*), which is a supermassive black hole, from 1996 to 2005 using the Nobeyama Millimeter Array of the Nobeyama Radio Observatory, Japan. These monitoring observations of Sgr A* were carried out in the 3- and 2-mm (100 and 140 GHz) bands, and we have detected several flares of Sgr A*. We found intraday variation of Sgr A* in the 2000 March flare. The twofold increase timescale is estimated to be about 1.5 hr at 140 GHz. This intraday variability suggests that the physical size of the flare-emitting region is compact on a scale at or below about 12 AU (~150 Rs; Schwarzschild radius). On the other hand, clear evidence of long-term periodic variability was not found from a periodicity analysis of our current millimeter data set. | |
| dc.description | 4 pages. Presented at the XXVIIIth Geleral Assembly of the URSI, Oct 2005, India | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0512625 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0512625 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/104266 | |
| dc.subject | Astrophysics | |
| dc.title | Flares of Sagittarius a* at Millimeter Wavelengths | |
| dc.type | text |