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http://hdl.handle.net/20.500.12386/28226
Titolo: | EXTraS discovery of a peculiar flaring X-ray source in the Galactic globular cluster NGC 6540 | Autori: | MEREGHETTI, Sandro DE LUCA, Andrea Salvetti, David BELFIORE MONDONI, Andrea MARELLI, MARTINO PAIZIS, ADAMANTIA RIGOSELLI, MICHELA SALVATERRA, Ruben SIDOLI, Lara TIENGO, ANDREA |
Data pubblicazione: | 2018 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 616 | Da pagina:: | A36 | Abstract: | We report the discovery of a flaring X-ray source 7″ from the center of the globular cluster NGC 6540 obtained during the EXTraS project devoted to a systematic search for variability in archival data of the XMM-Newton satellite. The source had a quiescent X-ray luminosity on the order of 10<SUP>32</SUP> erg s<SUP>-1</SUP> in the 0.5-10 keV range (for a distance of NGC 6540 of 4 kpc) and showed a flare lasting about 300 s. During the flare, the X-ray luminosity increased by more than a factor 40, with a total emitted energy of 10<SUP>36</SUP> erg. These properties, as well as Hubble Space Telescope photometry of the possible optical counterparts, suggest the identification with a chromospherically active binary in the cluster. However, the flare luminosity is significantly higher than what is commonly observed in stellar flares of such a short duration, leaving open the possibility of other interpretations. | URI: | http://hdl.handle.net/20.500.12386/28226 | URL: | https://www.aanda.org/articles/aa/abs/2018/08/aa33086-18/aa33086-18.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201833086 | Bibcode ADS: | 2018A&A...616A..36M | Fulltext: | open |
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