2008A&A...485..797R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:44:13

2008A&A...485..797R - Astronomy and Astrophysics, volume 485, 797-805 (2008/7-3)

Bright flares from the X-ray pulsar SWIFT J1626.6-5156.

REIG P., BELLONI T., ISRAEL G.L., CAMPANA S., GEHRELS N. and HOMAN J.

Abstract (from CDS):

We have performed a timing and spectral analysis of the X-ray pulsar SWIFT J1626.6-5156 during a major X-ray outburst in order to unveil its nature and investigate its flaring activity. Epoch- and pulse-folding techniques were used to derive the spin period. Time-average and pulse-phase spectroscopy were employed to study the spectral variability in the flare and out-of-flare states and energy variations with pulse phase. Power spectra were obtained to investigate the periodic and aperiodic variability. Two large flares, with a duration of ∼450s were observed on 24 and 25 December 2005. During the flares, the X-ray intensity increased by a factor of 3.5, while the peak-to-peak pulsed amplitude increased from 45% to 70%. A third, smaller flare of duration ∼180s was observed on 27 December 2005. The flares seen in SWIFT J1626.6-5156 constitute the shortest events of this kind ever reported in a high-mass X-ray binary. In addition to the flaring activity, strong X-ray pulsations with Pspin=15.3714±0.0003s characterise the X-ray emission in SWIFT J1626.6-5156. After the major outburst, the light curve exhibits strong long-term variations modulated with a 45-day period. We relate this modulation to the orbital period of the system or to a harmonic. Power density spectra show, in addition to the harmonic components of the pulsation, strong band-limited noise with an integrated 0.01-100Hz fractional rms of around 40% that increased to 64% during the flares. A weak QPO (fractional rms 4.7%) with characteristic frequency of 1Hz was detected in the non-flare emission. The timing (short X-ray pulsations, long orbital period) and spectral (power-law with cut off energy and neutral iron line) properties of SWIFT J1626.6-5156 are characteristic of Be/X-ray binaries.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: neutron - stars: binaries: close - stars: emission-line, Be

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 661 0
2 X LMC X-4 HXB 05 32 49.5558669817 -66 22 13.202534152   13.9 14.0     O8III 609 0
3 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1373 0
4 HD 306414 s*b 11 21 46.8237210288 -59 51 47.969821291 10.12 10.69 10.23 10.00   B1Ia 133 0
5 SWIFT J1626.5-5156 HXB 16 26 36.5197160119 -51 56 30.599836308       16.03 14.59 B0V 65 0
6 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1920 0
7 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 377 2
8 AX J1739.1-3020 HXB 17 39 11.5521531365 -30 20 37.783172824       13.91   O8.5Iab(f) 141 1
9 IGR J17544-2619 HXB 17 54 25.2724584579 -26 19 52.578788584   14.71 12.94 12.10 10.38 O9Ib 164 0
10 4U 1907+09 HXB 19 09 37.9 +09 49 49   19.41 16.35 14.40 12.53 O8.5Iab 307 1
11 2MASS J19493548+3012317 HXB 19 49 35.4840244577 +30 12 31.775034731   15.16 14.22 13.53 12.88 B0Ve 134 1
12 V* V2246 Cyg HXB 20 32 15.2744631713 +37 38 14.839930326   22.16 19.41 17.32 15.18 B0Ve 376 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:44:13

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