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Chandra and Xmm Monitoring of the Black Hole X-ray Binary Ic 10 X-1
| Content Provider | Semantic Scholar |
|---|---|
| Author | Laycock, Silas G. T. Cappallo, Rigel C. Moro, M. |
| Copyright Year | 2014 |
| Abstract | The massive black hole + Wolf-Rayet binary IC10 X-1 was observed in a series of 10 Chandra and 2 XMM-Newton observations spanning 2003-2012, showing consistent variability around 7×10 erg s−1, with a spectral hardening event in 2009. We phase-connected the entire light-curve by folding the photon arrival times on a series of trial periods spanning the known orbital period and its uncertainty, refining the X-ray period to P = 1.45175(1)d. The duration of minimum-flux in the X-ray eclipse is ∼5 hr which together with the optical radial velocity curve for the companion yields a radius for the eclipsing body of 8-10R for the allowed range of masses. The orbital separation (a1 + a2) = 18.5-22R then provides a limiting inclination i > 63 ◦ for total eclipses to occur. The eclipses are asymmetric (egress duration ∼ 0.9hr) and show energy dependence, suggestive of an accretiondisk hotspot and corona. The eclipse is much (∼5X) wider than the 1.5-2R WR star, pointing to absorption/scattering in the dense wind of the WR star. The same is true of the close analog NGC 300 X-1. RV measurements of the He II [λλ4686] line from the literature show a phase-shift with respect to the X-ray ephemeris such that the velocity does not pass through zero at mid-eclipse. The X-ray eclipse leads inferior conjunction of the RV curve by ∼90◦, so either the BH is being eclipsed by a trailing shock/plume, or the He II line does not directly trace the motion of the WR star and instead originates in a shadowed partially-ionized region of the stellar wind. Subject headings: stars: black holes, Wolf-Rayet, X-rays: binaries, eclipsing |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://faculty.uml.edu/slaycock/documents/X1_astroph_accepted.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Analog Arabic numeral 0 Black Hole CSPG5 gene Corona Diagnostic radiologic examination Eclipse Egress filtering File spanning GUCY2C protein, human Genetic Hotspot Java HotSpot Virtual Machine Medical Subject Headings Molecular orbital New General Catalogue Newton Photons Plume (fluid dynamics) Radial (radio) Rajiformes Shock Spatial variability Stars, Celestial Stellar (payment network) Stellar Wind Velocity (software development) X-Ray (Amazon Kindle) X86 |
| Content Type | Text |
| Resource Type | Article |
