2005A&A...437..997T


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.21CEST15:21:06

2005A&A...437..997T - Astronomy and Astrophysics, volume 437, 997-1005 (2005/7-3)

Three XMM-Newton observations of the anomalous X-ray pulsar 1E 1048.1-5937: Long term variations in spectrum and pulsed fraction.

TIENGO A., MEREGHETTI S., TUROLLA R., ZANE S., REA N., STELLA L. and ISRAEL G.L.

Abstract (from CDS):

We report the results of a recent (July 2004) XMM-Newton Target of Opportunity observation of the Anomalous X-ray Pulsar 1E 1048.1-5937 together with a detailed re-analysis of previous observations carried out in 2000 and 2003. In July 2004 the source had a 2-10keV flux of 6.2x10–12erg/cm2/s and a pulsed fraction PF=0.68. Comparison of the three data sets shows the presence of an anti-correlation between flux and pulsed fraction, implying that previous estimates of the source energetics based on the assumption of a large and constant pulsed fraction might be significantly underestimated. The source spectrum is well described by a power law plus blackbody model (kT∼0.63keV, photon index Γ∼2.7-3.5) or, alternatively, by the sum of two blackbodies of which the hotter is Comptonized by relativistic electrons. In this case the temperatures are kT1∼0.2-0.3keV and kT2∼0.4-0.5keV and the emitting area of the cooler component is consistent with the whole neutron star surface. The long-term luminosity variation of a factor >2 is accompanied by relatively small variations in the spectral shape. Phase-resolved spectroscopy indicates a harder spectrum together with the pulse maximum. No spectral features have been detected with 4σ limits on the equivalent width in the range ∼10-220eV, depending on line energy and width.

Abstract Copyright:

Journal keyword(s): stars: individual: 1E 1048.1-5937 - X-rays: stars

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PSR J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 521 0
2 2E 2336 HXB 10 50 08.93 -59 53 19.9           Be 385 0
3 PSR J1708-4008 Psr 17 08 49.0 -40 09 10           ~ 269 0
4 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1138 2
5 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 801 0
6 2E 4673 HXB 23 01 08.14 +58 52 44.5           ~ 597 1

    Equat.    Gal    SGal    Ecl

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