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| Content Provider | Springer Nature Link |
|---|---|
| Author | Gotthelf, Eric V. Tam, Cindy R. Gaensler, Bryan M. Kaspi, Victoria M. |
| Copyright Year | 2007 |
| Abstract | The population of clearly identified anomalous X-ray pulsars has recently grown to seven, however, one candidate anomalous X-ray pulsar (AXP) still eludes re-confirmation. Here, we present a set of seven Chandra ACIS-S observations of the transient pulsar AX J1845.0-0258, obtained during 2003. Our observations reveal a faint X-ray point source within the ASCA error circle of AX J1845.0-0258’s discovery, which we designate CXOU J184454.6-025653 and tentatively identify as the quiescent AXP. Its spectrum is well described by an absorbed single-component blackbody (kT∼2.0 keV) or power law (Γ∼1.0) that is steady in flux on timescales of at least months, but fainter than AX J1845.0-0258 was during its 1993 period of X-ray enhancement by at least a factor of 13. Compared to the outburst spectrum of AX J1845.0-0258, CXOU J184454.6-025653 is considerably harder: if truly the counterpart, then its spectral behavior is contrary to that seen in the established transient AXP XTE J1810-197, which softened from kT∼0.67 keV to ∼0.18 keV in quiescence. This unexpected result prompts us to examine the possibility that we have observed an unrelated source, and we discuss the implications for AXPs, and magnetars in general. |
| Ending Page | 523 |
| Page Count | 5 |
| Starting Page | 519 |
| File Format | |
| ISSN | 0004640X |
| e-ISSN | 1572946X |
| Journal | Astrophysics and Space Science |
| Issue Number | 1-4 |
| Volume Number | 308 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2007-03-20 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Neutron star AX J1845.0-0258 AXP Pulsar Magnetar Astronomy |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
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