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Simultaneous HESS and Chandra observations of Sagitarius A(star) during an X-ray flare
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2008 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 492, no 1, p. L25-L28Article in journal (Refereed) Published
Abstract [en]

The rapidly varying (similar to 10 min timescale) non-thermal X-ray emission observed from Sgr A(star) implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV gamma-ray source HESS J1745-290 is coincident with Sgr A(star) and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint HESS/Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of approximate to 9 increase in the X-ray flux of Sgr A(star), no evidence is found for an increase in the TeV gamma-ray flux from this region. We find that an increase in the gamma-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the gamma-ray emission is produced within similar to 1014 cm (similar to 100 RS) of the supermassive black hole.

Place, publisher, year, edition, pages
EDP Sciences, 2008. Vol. 492, no 1, p. L25-L28
Keywords [en]
X-rays, individuals, Sgr A(star), gamma rays, observations
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30272DOI: 10.1051/0004-6361:200810912ISI: 000261253100007OAI: oai:DiVA.org:lnu-30272DiVA, id: diva2:706998
Available from: 2014-03-24 Created: 2013-11-08 Last updated: 2017-12-05Bibliographically approved

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Becherini, Yvonne

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  • apa
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  • de-DE
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  • fi-FI
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  • Other locale
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Output format
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  • asciidoc
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