ChandraandXMMObservations of the Accretion Disk Corona Source 2S 0921−63

Autor:	Jean Cottam, T. R. Kallman, Bram Boroson, Lorella Angelini
Rok vydání:	2003
Předmět:	Physics Accretion disc Space and Planetary Science Astrophysics::High Energy Astrophysical Phenomena Binary number Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Photoionization Astrophysics K-line Accretion (astrophysics) Spectral line
Zdroj:	The Astrophysical Journal. 583:861-877
ISSN:	1538-4357 0004-637X
Popis:	We analyze observations of the low-mass X-ray binary (LMXB) 2S 0921-63 obtained with the gratings and CCDs on Chandra and XMM. This object is a high-inclination system showing evidence for an accretion disk corona (ADC). Such a corona has the potential to constrain the properties of the heated accretion disk in this system and other LMXBs by extension. We find evidence for line emission that is generally consistent with that found by previous experiments, although we are able to detect more lines. For the first time in this source, we find that the iron K line has multiple components. We set limits on the line widths and velocity offsets, and we fit the spectra to photoionization models and discuss the implications for ADC models. For the first time in any ADC source we use these fits, together with density constraints based on the O VII line ratio, in order to constrain the flux in the medium-ionization region of the ADC. Under various assumptions about the source luminosity this constrains the location of the emitting region. These estimates, together with estimates for the emission measure, favor a scenario in which the intrinsic luminosity of the source is comparable to what we observe.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0bad5f5f0034e081c90cfa8253ba6a47 https://doi.org/10.1086/345475 Zobrazit plný text záznamu