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16 April 2024 |
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A Radio Outburst Nearly Coincident with the Large X-ray Flare from Sgr A* on 2002-10-03 | | Jun-Hui Zhao
; R. M. Herrnstein
; G. C. Bower
; W. M. Goss
; S. M. Liu
; | | Date: |
23 Dec 2003 | | Journal: | Astrophys.J. 603 (2004) L85-L88 | | Subject: | astro-ph | | Abstract: | A large radio outburst from Sgr A* was observed during the VLA weekly monitoring program at 2 cm, 1.3 cm and 7 mm, nearly coincident with the brightest X-ray flare detected to date with the XMM-Newton X-ray Observatory on 2002-10-03. The flux density of 1.9$pm$0.2 Jy measured at 7 mm exceeds the mean value (1.00$pm$0.01 Jy) by a factor of $sim 2$, one of the two highest increases observed during the past three years (June 2000-October 2003), while less significant increases in flux densities were observed at 1.3 cm and 2 cm. The radio observation started 13.5 hrs after the onset of the X-ray flare (which had occurred over a 45 min duration) and continued for 1.3 hrs. During the observation, there was no significant ($<3sigma$) change in the radio flux densities at all the three wavelengths, indicating that the radio outburst varied on a timescale of $>1$hr. A spectral index of $alpha=2.4^{+0.3}_{-0.6}$ (${
m S propto
u^alpha}$) was derived for the outburst component, consistent with an optically thick nonthermal synchrotron source. These results suggest that energetic electrons responsible for the radio outburst might be produced via a process associated with the X-ray flare, then transported to large radii, producing the observed radio outburst. The observation is the first evidence for a correlated variation in the radio and X-ray emissions from Sgr A*. | | Source: | arXiv, astro-ph/0401508 | | Services: | Forum | Review | PDF | Favorites | |
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