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http://hdl.handle.net/20.500.12386/27072
Titolo: | First hard X-ray detection and broad-band X-ray study of the unidentified transient AX J1949.8+2534 | Autori: | SGUERA, VITO SIDOLI, Lara PAIZIS, ADAMANTIA MASETTI, NICOLA Bird, A. J. BAZZANO, ANGELA |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 469 | Fascicolo: | 4 | Da pagina:: | 3901 | Abstract: | We present the results from INTEGRAL and Swift/XRT observations of the hitherto poorly studied unidentified X-ray transient AX J1949.8+2534, and on archival multiwavelength observations of field objects. Bright hard X-ray outbursts have been discovered above 20 keV for the first time, the measured duty cycle and dynamic range are of the order of ∼4 per cent and ≥ 630, respectively. The source was also detected during a low soft X-ray state (∼2 × 10<SUP>-12</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP>) thanks to a Swift/XRT followup, which allowed for the first time to perform a soft X-ray spectral analysis as well as significantly improve the source positional uncertainty from arcminute to arcsecond size. From archival near-infrared data, we pinpointed two bright objects as most likely counterparts whose photometric properties are compatible with an early-type spectral nature. This strongly supports a high-mass X-ray binary (HMXB) scenario for AX J1949.8+2534, specifically a Supergiant Fast X-ray Transient (more likely) or alternatively a Be HMXB. | URI: | http://hdl.handle.net/20.500.12386/27072 | URL: | https://academic.oup.com/mnras/article/469/4/3901/3813436 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx1111 | Bibcode ADS: | 2017MNRAS.469.3901S | Fulltext: | open |
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