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http://hdl.handle.net/20.500.12386/25192
Title: | A new investigation of the possible X-ray counterparts of the magnetar candidate AX J1845-0258 | Authors: | Pintore, Fabio MEREGHETTI, Sandro |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 460 | Issue: | 1 | First Page: | 1033 | Abstract: | AX J1845-0258 is a transient X-ray pulsar, with spin period of 6.97 s, discovered with the ASCA satellite in 1993. Its soft spectrum and the possible association with a supernova remnant suggest that AX J1845-0258 might be a magnetar, but this has not been confirmed yet. A possible counterpart one order of magnitude fainter, AX J184453-025640, has been found in later X-ray observations, but no pulsations have been detected. In addition, some other X-ray sources are compatible with the pulsar location, which is in a crowded region of the Galactic plane. We have carried out a new investigation of all the X-ray sources in the ASCA error region of AX J1845-0258, using archival data obtained with Chandra in 2007 and 2010, and with XMM-Newton in 2010. We set an upper limit of 6 per cent on the pulsed fraction of AX J184453-025640 and confirmed its rather hard spectrum (power-law photon index of 1.2 ± 0.3). In addition to the other two fainter sources already reported in the literature, we found other X-ray sources positionally consistent with AX J1845-0258. Although many of them are possibly foreground stars likely unrelated to the pulsar, at least another new source, CXOU J184457.5-025823, could be a plausible counterpart of AX J1845-0258. It has a flux of 6 × 10<SUP>-14</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP> and a spectrum well fitted by a power law with photon index ∼1.3 and N<SUB>H</SUB> ∼ 10<SUP>22</SUP> cm<SUP>-2</SUP>. | URI: | http://hdl.handle.net/20.500.12386/25192 | URL: | https://academic.oup.com/mnras/article/460/1/1033/2608836 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1036 | Bibcode ADS: | 2016MNRAS.460.1033P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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