Effects of variability of X-ray binaries on the X-ray luminosity functions of Milky Way

Islam, Nazma and Paul, Biswajit (2016) Effects of variability of X-ray binaries on the X-ray luminosity functions of Milky Way. In: NEW ASTRONOMY, 47 . pp. 81-87.

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Abstract

The X-ray luminosity functions of galaxies have become a useful tool for population studies of X-ray binaries in them. The availability of long term light-curves of X-ray binaries with the All Sky X-ray Monitors opens up the possibility of constructing X-ray luminosity functions, by also including the intensity variation effects of the galactic X-ray binaries. We have constructed multiple realizations of the X-ray luminosity functions (XLFs) of Milky Way, using the long term light-curves of sources obtained in the 2-10 keV energy band with the RXTE-ASM. The observed spread seen in the value of slope of both HMXB and LMXB XLFs are due to inclusion of variable luminosities of X-ray binaries in construction of these XLFs as well as finite sample effects. XLFs constructed for galactic HMXBs in the luminosity range 10(36)-10(39) erg/sec is described by a power-law model with a mean power-law index of -0.48 and a spread due to variability of HMXBs as 0.19. XLFs constructed for galactic LMXBs in the luminosity range 10(36)-10(39) erg/sec has a shape of cut-off power-law with mean power-law index of -0.31 and a spread due to variability of LMXBs as 0.07. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	NEW ASTRONOMY
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	X-rays: binaries; X-rays: galaxies; Galaxies: luminosity functions; Galaxies: Milky Way
Department/Centre:	UG Programme
Date Deposited:	15 Jun 2016 05:42
Last Modified:	15 Jun 2016 05:42
URI:	http://eprints.iisc.ac.in/id/eprint/53942

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