2008ApJ...677..503T


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST11:44:46

2008ApJ...677..503T - Astrophys. J., 677, 503-514 (2008/April-2)

X-ray and Near-IR variability of the anomalous X-ray pulsar 1E 1048.1-5937: from quiescence back to activity.

TAM C.R., GAVRIIL F.P., DIB R., KASPI V.M., WOODS P.M. and BASSA C.

Abstract (from CDS):

We report on new and archival X-ray and near-IR observations of the anomalous X-ray pulsar 1E 1048.1-5937 performed between 2001 and 2007 with the Rossi X-Ray Telescope Explorer (RXTE), the Chandra X-Ray Observatory, the Swift Gamma-Ray Burst Explorer, the Hubble Space Telescope (HST), and the Very Large Telescope. Monitoring with RXTE revealed that following its ∼2001-2004 active period, 1E 1048.1-5937 entered a phase of timing stability; at the same time, simultaneous observations with Chandra and HST in 2006 showed that its X-ray and near-IR radiative properties, all variable prior to 2005, stabilized. Specifically, the 2006 X-ray spectrum is consistent with a two-component blackbody plus power law, with an average kt=0.52 keV and Γ=2.8, at a mean flux level of ∼6.5x10–12 erg/cm2/s (2-10 keV). The near-IR counterpart in 2005-2006 was detected at H∼22.7 mag and Ks∼21.0 mag, considerably fainter than previously measured. In 2007 March, this newfound quiescence was interrupted by sudden X-ray flux, spectral, and pulse morphology changes, simultaneous with a large glitch and near-IR enhancement. Our RXTE observations revealed a factor of ∼3 increase in pulsed flux (2-10 keV), while observations with Chandra and Swift saw the total X-ray flux increase much more than the pulsed flux, reaching a peak value of >7 times the quiescent value (2-10 keV). We find a strong anticorrelation between X-ray flux and pulsed fraction, and a correlation between X-ray spectral hardness and flux. Simultaneously with the radiative and timing changes, we observed the X-ray pulse profile change significantly from nearly sinusoidal to having multiple peaks. We compare these remarkable events with other magnetar outbursts and discuss implications in the context of AXP emission models.

Abstract Copyright:

Journal keyword(s): Stars: Pulsars: General - pulsars: individual (1E 1048.1-5937) - Stars: Neutron

Simbad objects: 8

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Number of rows : 8

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     ~ 520 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 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 385 0
6 PSR J1841-0456 Psr 18 41 19.29 -04 56 11.4           ~ 239 1
7 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 801 0
8 2E 4673 HXB 23 01 08.14 +58 52 44.5           ~ 597 1

    Equat.    Gal    SGal    Ecl

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2021.04.18-11:44:46

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