Peculiar spectral and power spectral behaviour of the LMXB GX 13+1

Schnerr, R. S.; Reerink, Thomas; Klis, M. van der; Homan, J.; Méndez, Mariano; Fender, R. P.; Kuulkers, E.

doi:10.1051/0004-6361:20030682

Cited by 31 publications

(50 citation statements)

References 39 publications

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“…As discussed in detail by F15, GX 13+1 shows substantial secular evolution of its Z track in CDs and hardness-intensity diagrams (HIDs), with the shape and position of the Z track changing on timescales of days or longer (see also Schnerr et al 2003). F15 combined data into six different groups to illustrate the evolution of the Z tracks of GX 13+1 (see their Figure 12 and Table 5).…”

Section: Rxtementioning

confidence: 96%

Evidence for Simultaneous Jets and Disk Winds in Luminous Low-Mass X-Ray Binaries

Homan

Neilsen

Allen

et al. 2016

ApJL

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Recent work on jets and disk winds in low-mass X-ray binaries (LMXBs) suggests that they are to a large extent mutually exclusive, with jets observed in spectrally hard states and disk winds observed in spectrally soft states. In this paper we use existing literature on jets and disk winds in the luminous neutron star (NS) LMXB GX 13+1, in combination with archival Rossi X-ray Timing Explorer data, to show that this source is likely able to produce jets and disk winds simultaneously. We find that jets and disk winds occur in the same location on the source's track in its X-ray color-color diagram. A further study of literature on other luminous LMXBs reveals that this behavior is more common, with indications for simultaneous jets and disk winds in the black hole LMXBs V404 Cyg and GRS 1915+105 and the NS LMXBs Sco X-1 and Cir X-1. For the three sources for which we have the necessary spectral information, we find that simultaneous jets/winds all occur in their spectrally hardest states. Our findings indicate that in LMXBs with luminosities above a few tens of percent of the Eddington luminosity, jets and disk winds are not mutually exclusive, and the presence of disk winds does not necessarily result in jet suppression.

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Section: Rxtementioning

confidence: 96%

Evidence for Simultaneous Jets and Disk Winds in Luminous Low-Mass X-Ray Binaries

Homan

Neilsen

Allen

et al. 2016

ApJL

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“…9 Low i suggested by the high radio to X-ray flux ratio, in the framework of a Doppler boosting model (Schnerr et al 2003).…”

Section: Rgs Spectramentioning

confidence: 99%

Discovery of X-ray absorption features from the dipping low-mass X-ray binary XB 1916-053 with XMM-Newton

Boirin

Parmar

Barret

et al. 2004

A&A

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Abstract.We report the discovery of narrow Fe  and Fe  Kα X-ray absorption lines at 6.65 +0.05 −0.02 and 6.95 +0.05 −0.04 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an XMM-Newton observation performed in September 2002. In addition, there is marginal evidence for absorption features at 1.48 keV, 2.67 keV, 7.82 keV and 8.29 keV consistent with Mg , S , Ni  Kα and Fe  Kβ transitions, respectively. Such absorption lines from highly ionized ions are now observed in a number of high inclination (i.e. close to edge-on) LMXBs, such as XB 1916-053, where the inclination is estimated to be between 60-80 • . This, together with the lack of any orbital phase dependence of the features (except during dips), suggests that the highly ionized plasma responsible for the absorption lines is located in a cylindrical geometry around the compact object. Using the ratio of Fe  and Fe  column densities, we estimate the photo-ionization parameter of the absorbing material, ξ, to be 10 3.92 erg cm s −1 . Only the Fe  line is observed during dipping intervals and the upper-limits to the Fe  column density are consistent with a decrease in the amount of ionization during dipping intervals. This implies the presence of cooler material in the line of sight during dipping. We also report the discovery of a 0.98 keV absorption edge in the persistent emission spectrum. The edge energy decreases to 0.87 keV during deep dipping intervals. The detected feature may result from edges of moderately ionized Ne and/or Fe with the average ionization level decreasing from persistent emission to deep dipping. This is again consistent with the presence of cooler material in the line of sight during dipping.

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“…We believe that the periodic dips shown in this work are connected to the periodic motion of the hot spot at the outer accretion disc caused by the impact of the stream of matter from the companion star. On the other hand, the dipping state in GX 13+1 observed by Díaz Trigo et al (2012) in several XMM observations and the bi-modal behaviour of the HR with respect to the intensity of the source observed by Schnerr et al (2003) in the RXTE/PCA observations P30050-01 and P30051-01 and by Stella et al (1985) in the EXOSAT observation taken on 1983 September 22, may be caused by partial absorption in the large outflow of matter from the inner region of the system detected by several authors (see, e.g., Ueda et al 2001Ueda et al , 2004Díaz Trigo et al 2012).…”

Section: Ephemeris Of Gx 13+1mentioning

confidence: 94%

“…However, the authors did not perform a systematic search for dips and their suggestion is based on the bi-modal behaviour of the count rate with the HR reported by Schnerr et al (2003). We re-analysed the RXTE/PCA observations P30050-01 and P30051-01 which span a time interval from 50 950 to 51 096 MJD (i.e., 5.94 orbital cycles for a period of 25.5274 d).…”

Section: Ephemeris Of Gx 13+1mentioning

confidence: 99%

Discovery of periodic dips in the light curve of GX 13+1: the X-ray orbital ephemeris of the source

Iaria

Salvo

Burderi

et al. 2014

A&A

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Context. The bright low-mass X-ray binary (LMXB) GX 13+1 is one of the most peculiar Galactic binary systems. A periodicity of 24.27 d was observed in its power spectrum density obtained from data collected over 14 years by the All Sky Monitor (ASM) on board the Rossi X-ray Timing Explorer (RXTE). Aims. To determine the first X-ray orbital ephemeris of GX 13+1, we systematically searched for periodic dips in the RXTE/ASM and Monitor of All-sky X-ray Image (MAXI) light curves of the source, the light curves span from 1996 up to 2013. Methods. We searched for a periodic signal in the RXTE/ASM and MAXI light curves and find a common periodicity of 24.53 d. We folded the 1.3-5 keV and 5-12.1 keV RXTE/ASM light curves and the 2-4 and 4-10 keV MAXI light curves with the period of 24.53 d and detected a periodic dip. To refine the value of the period we divided the RXTE/ASM and MAXI light curves into eight and two intervals, respectively. Using the timing technique, we obtained four and two dip arrival times from the RXTE/ASM and MAXI light curves, respectively. Results. We improved the X-ray position of GX 13+1 using a recent Chandra observation. The new X-ray position is discrepant by ∼7 from the previous one, while it is compatible with the infrared and radio counterpart positions. We detected an X-ray dip totally covered by the Chandra observation and showed, a posteriori, that it is a periodic dip. We obtained seven dip arrival times from RXTE/ASM, MAXI, and Chandra light curves. We calculated the delays of the detected dip arrival times with respect to the expected times for a 24.52 d periodicity. Fitting the delays with a linear function, we find that the orbital period and the epoch of reference of GX 13+1 are 24.5274(2) days and 50 086.79(3) MJD, respectively. We do not improve the fit by adopting a quadratic ephemeris. The inferred orbital period derivative of 8(37) × 10 −8 s/s, with an error of 68% confidence level, does not allow us to constrain the orbital evolution of the binary system. Conclusions. We demonstrated the existence of periodic dips in both RXTE/ASM and MAXI light curves, and estimated that the orbital period of GX 13+1 is 24.5274(2) d. The LMXB GX 13+1 has the longest known orbital period for a Galactic neutron star LMXB powered by Roche lobe overflow.

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Peculiar spectral and power spectral behaviour of the LMXB GX 13+1

Cited by 31 publications

References 39 publications

Evidence for Simultaneous Jets and Disk Winds in Luminous Low-Mass X-Ray Binaries

Evidence for Simultaneous Jets and Disk Winds in Luminous Low-Mass X-Ray Binaries

Discovery of X-ray absorption features from the dipping low-mass X-ray binary XB 1916-053 with XMM-Newton

Discovery of periodic dips in the light curve of GX 13+1: the X-ray orbital ephemeris of the source

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