<i>XMM-Newton</i>observations of GX 13 + 1: correlation between photoionised absorption and broad line emission

Trigo, María Díaz; Sidoli, L.; Boirin, L.; Parmar, A. N.

doi:10.1051/0004-6361/201219049

Cited by 47 publications

(108 citation statements)

References 62 publications

(131 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, several X-ray binaries have exhibited absorption lines from highly ionized iron (Boirin et al 2004;Kubota et al 2007;Díaz Trigo et al 2012). Many of those sources show dips in their light curves, which are believed to be caused by obscuration of the central X-ray source by a dense material located at the outer edge of an accretion disk.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Disk emission and atmospheric absorption lines in black hole candidate 4U 1630-472

Różáńska

Madej

Bagińska

et al. 2014

A&A

View full text Add to dashboard Cite

Context. We analyzed Suzaku data of the black hole candidate 4U 1630-472 when it was in the high/soft state. The source, known for X-ray outbursts and for absorption dips, has an X-ray continuum spectrum that is interpreted correctly as emission from an accretion disk. Additionally, two absorption lines from He and H-like iron have been clearly detected in the high-resolution data from 4U 1630-472. Aims. We show that the continuum X-ray spectrum of 4U 1630-472 with iron absorption lines can be satisfactorily modeled by the spectrum from an accretion disk atmosphere. Absorption lines of highly ionized iron originating in a hot accretion-disk atmosphere can be an alternative or complementary explanation to the wind model usually favored for this type of sources. Methods. We performed full radiative transfer calculations to model the emission from an accretion disk surface that is seen at different viewing angles using our transfer code ATM21. Computed models are then fitted to high-resolution X-ray spectra of 4U 1630-472 obtained by the Suzaku satellite. Results. We modeled continuum and line spectra using a single model. Absorption lines of highly ionized iron can originate in the upper parts of the disk atmosphere, which is intrinsically hot because of the high disk temperature. Iron line profiles computed with natural, thermal, and pressure broadenings match observations very well. Conclusions. According to any global disk models considered for the mass of central object that is close to 10 M or less, the effective temperature of the inner radii reaches 10 7 K. We showed that the accretion disk atmosphere can effectively produce iron absorption lines observed in 4U 1630-472 spectrum. Absorption line arising in an accretion disk atmosphere is the important part of the observed line profile, even if there are also other mechanisms responsible for the absorption features. Nevertheless, the wind theory can be an artefact of the fitting procedure when the continuum and lines are fitted as separate model components.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Such obscuring material was accumulated during the accretion phase from the companion star onto the disk (White & Swank 1982). The presence of dips and the lack of total X-ray eclipses by the companion star indicate that the system is viewed relatively close to edge-on, at an inclination angle in the range ∼60-80 • (Frank et al 1987).…”

Section: Introductionmentioning

confidence: 99%

Disk emission and atmospheric absorption lines in black hole candidate 4U 1630-472

Różáńska

Madej

Bagińska

et al. 2014

A&A

View full text Add to dashboard Cite

show abstract

“…The LMXB GX 13+1 was observed nine times by XMM; a complete analysis of the Reflection Grating Spectrometer (RGS) and Epic-pn light curves and spectra of the source has recently been reported by Díaz Trigo et al (2012). The most significant detection of a dip is during the observation ID 0505480501 taken on 2008 March 25.…”

Section: Xmm/rgsmentioning

confidence: 99%

“…The object GX 13+1 is a bright low-mass X-ray binary (LMXB); the detection of sporadic X-ray bursts (Fleischman 1985;Matsuba et al 1995) suggests that the accreting compact object is a neutron star. Using infrared data, Bandyopadhyay et al (1999) estimated that the spectral type of the companion star is K5 III and the distance to the source is 7 ± 1 kpc.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Díaz Trigo et al (2012) analysed several XMM data sets of GX 13+1 fitting the continuum emission with a model consisting of a disc-black body, plus a black body component with a Gaussian emission line at 6.55-6.7 keV. The authors also found that the continuum emission is absorbed by cold and photo-ionised material and constrained the inclination of GX13+1 to be between 60 and 80…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Accretion disc atmospheres and winds in low‐mass X‐ray binaries

Trigo¹,

Boirin

2016

Astron Nachr

Self Cite

114

View full text Add to dashboard Cite

In the last decade, X-ray spectroscopy has enabled a wealth of discoveries of photoionised absorbers in X-ray binaries. Studies of such accretion disc atmospheres and winds are of fundamental importance to understand accretion processes and possible feedback mechanisms to the environment. In this work, we review the current observational state and theoretical understanding of accretion disc atmospheres and winds in low-mass X-ray binaries, focusing on the wind launching mechanisms and on the dependence on accretion state. We conclude with issues that deserve particular attention.

show abstract

XMM-Newtonobservations of GX 13 + 1: correlation between photoionised absorption and broad line emission

Cited by 47 publications

References 62 publications

Disk emission and atmospheric absorption lines in black hole candidate 4U 1630-472

Disk emission and atmospheric absorption lines in black hole candidate 4U 1630-472

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

Accretion disc atmospheres and winds in low‐mass X‐ray binaries

Contact Info

Product

Resources

About