CHANDRA OBSERVATIONS OF SGR 1627-41 NEAR QUIESCENCE
- Department of Physics, McGill University, Rutherford Physics Building, 3600 University Street, Montreal, QC H3A 2T8 (Canada)
- Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States)
- Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027 (United States)
- Department of Astronomy and Harvard-Smithsonian Center for Astrophysics, Harvard University, 60 Garden Street, Cambridge, MA 02138 (United States)
We report on an observation of SGR 1627-41 made with the Chandra X-Ray Observatory on 2011 June 16. Approximately three years after its outburst activity in 2008, the source's flux has been declining, as it approaches its quiescent state. For an assumed power-law spectrum, we find that the absorbed 2-10 keV flux for the source is 1.0{sup +0.3}{sub -0.2} Multiplication-Sign 10{sup -13} erg cm{sup -2} s{sup -1} with a photon index of 2.9 {+-} 0.8 (N{sub H} = 1.0 Multiplication-Sign 10{sup 23} cm{sup -2}). This flux is approximately consistent with that measured at the same time after the source's outburst in 1998. With measurements spanning three years after the 2008 outburst, we analyze the long-term flux and spectral evolution of the source. The flux evolution is well described by a double exponential with decay times of 0.5 {+-} 0.1 and 59 {+-} 6 days, and a thermal cooling model fit suggests that SGR 1627-41 may have a hot core (T{sub c} {approx} 2 Multiplication-Sign 10{sup 8} K). We find no clear correlation between flux and spectral hardness as found in other magnetars. We consider the quiescent X-ray luminosities of magnetars and the subset of rotation-powered pulsars with high magnetic fields (B {approx}> 10{sup 13} G) in relation to their spin-inferred surface magnetic field strength and find a possible trend between the two quantities.
- OSTI ID:
- 22092262
- Journal Information:
- Astrophysical Journal, Vol. 757, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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