2012A&A...537A..66G


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.26CEST23:57:03

2012A&A...537A..66G - Astronomy and Astrophysics, volume 537A, 66-66 (2012/1-1)

Spin period evolution of GX 1+4.

GONZALEZ-GALAN A., KUULKERS E., KRETSCHMAR P., LARSSON S., POSTNOV K., KOCHETKOVA A. and FINGER M.H.

Abstract (from CDS):

We aim both to complement the existing data on the spin history of the peculiar accreting X-ray pulsar GX 1+4 with more past and current data from BeppoSAX, INTEGRAL, and Fermi and to interpret the evolution in the framework of accretion theory. We used source light curves obtained from BeppoSAX/WFC and INTEGRAL/ISGRI to derive pulse periods using an epoch-folding analysis. Fermi/GBM data were analysed by fitting a constant plus a Fourier expansion to background-subtracted rates, and maximizing the Y2 statistic. We completed the sample with hard X-ray light curves from Swift/BAT. The data were checked for correlations between flux and changes of the pulsar spin on different timescales. The spin-down of the pulsar continues with a constant change in frequency, i.e., an apparently accelerating change in the period. Over the past three decades, the pulse period has increased by about ∼50%. Short-term fluctuations on top of this long-term trend do show anti-correlation with the source flux. Possible explanations of the observed long-term frequency and its dependence on flux are discussed.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: bursts - pulsars: individual: GX 1+4

Status at CDS:  

Simbad objects: 6

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1369 0
2 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4       O9III/Veq 991 0
3 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1913 0
4 V* V2116 Oph Sy* 17 32 02.1544831482 -24 44 44.125962969   20.78 18.4     M6IIIe 644 1
5 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11438 0
6 NAME Galactic Bulge reg ~ ~           ~ 3362 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012A&A...537A..66G and select 'bookmark this link' or equivalent in the popup menu


2020.05.26-23:57:03

© Université de Strasbourg/CNRS

    • Contact