A Connection Between A Large Radio Outburst and the Large X-ray Flare from Sgr A* on 2002-10-3

Details A Connection Between A Large Radio Outburst and the Large X-ray Flare from Sgr A* on 2002-10-3 A Connection Between A Large Radio Outburst and the Large X-ray Flare from Sgr A* on 2002-10-3

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xrrc.proce7.29z&link_type=abstract

"X-Ray and Radio Connections (eds. L.O. Sjouwerman and K.K Dyer) Published electronically by NRAO, http://www.aoc.nrao.edu/event

Astronomy and Astrophysics

Astrophysics

X-Ray, Radio, Dissipation Of Jets

Scientific paper

Sgr A*, a compact radio source at the Galactic center, provides a unique astrophysical laboratory for us to study connections between X-ray and radio emission from low luminosity active galactic nuclei. In this paper, we summarize and discuss the physical properties of a large radio outburst at 7 mm from Sgr A* observed during the Very Large Array weekly monitoring program at 2 cm, 1.3 cm and 7 mm, coincident with the largest X-ray flare detected to date with the XMM-Newton X-ray Observatory on 2002-10-03. The X-ray flare appears to be special in many aspects. Besides the high luminosity and softer spectrum at X-ray, a large radio outburst at 7 mm was detected within the same day showing the radio spectral index α = 2.4^{+0.3}_{-0.6} (S∝ν^α), consistent with an optically thick non-thermal synchrotron source. Since the radio source is well confined within a size of 50 Schwarzschild radii of the black hole with a mass of 4 million solar masses, the correlation is the first evidence for that the X-ray flare arises from the inner region of the accretion flow near the event horizon of the supermassive black hole at the Galactic center rather than from star-star collision or from the heated part of the disk via star-disk interaction. 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.

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