C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST04:13:33

2016A&A...596A..71P - Astronomy and Astrophysics, volume 596A, 71-71 (2016/12-1)

The 2015 outburst of the accreting millisecond pulsar IGR J17511-3057 as seen by INTEGRAL, Swift, and XMM-Newton.


Abstract (from CDS):

We report on INTEGRAL, Swift, and XMM-Newton observations of IGR J17511-3057 performed during the outburst that occurred between March 23 and April 25, 2015. The source reached a peak flux of 0.7(2)x10–9erg/cm2/s and decayed to quiescence in approximately a month. The X-ray spectrum was dominated by a power law with photon index between 1.6 and 1.8, which we interpreted as thermal Comptonization in an electron cloud with temperature >20keV. A broad (σ~=1keV) emission line was detected at an energy (E=6.9+0.2–0.3keV) compatible with the K-α transition of ionized Fe, suggesting an origin in the inner regions of the accretion disk. The outburst flux and spectral properties shown during this outburst were remarkably similar to those observed during the previous accretion event detected from the source in 2009. Coherent pulsations at the pulsar spin period were detected in the XMM-Newton and INTEGRAL data at a frequency compatible with the value observed in 2009. Assuming that the source spun up during the 2015 outburst at the same rate observed during the previous outburst, we derive a conservative upper limit on the spin-down rate during quiescence of 3.5x10–15Hz/s. Interpreting this value in terms of electromagnetic spin-down yields an upper limit of 3.6x1026G.cm3 to the pulsar magnetic dipole (assuming a magnetic inclination angle of 30°). We also report on the detection of five type-I X-ray bursts (three in the XMM-Newton data, two in the INTEGRAL data), none of which indicated photospheric radius expansion.

Abstract Copyright: © ESO, 2016

Journal keyword(s): pulsars: general - stars: neutron - X-rays: binaries - X-rays: individuals: IGR J17511-3057

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 308 0
2 XSS J12270-4859 LXB 12 27 58.7475950389 -48 53 42.826034125           ~ 205 0
3 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
4 IGR J17511-3057 LXB 17 51 08.55 -30 57 41.7           ~ 86 1
5 IGR J18245-2452 LXB 18 24 32.50 -24 52 07.8           ~ 172 0

    Equat.    Gal    SGal    Ecl

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