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Comparing X-ray color selection in separating X-ray binary classes using Color-Color-Intensity diagrams | | Nazma Islam
; S.D. Vrtilek
; Bram Boroson
; D.-W. Kim
; E. O'Sullivan
; M. L. McCollough
; G. Fabbiano
; C. Anderson
; D. J. Burke
; R. D'Abrusco
; A. Fruscione
; J. L. Lauer
; D. Morgan
; A. Mossman
; A. Paggi
; G. Trinchieri
; | | Date: |
11 Jul 2020 | | Abstract: | X-ray binaries exhibit a wide range of properties but there are few accepted
methods to determine the nature of the compact object. Color-Color-Intensity
diagrams have been suggested as a means of distinguishing between systems
containing black holes from those containing neutron stars. However, this
technique has been verified with data from only one instrument (RXTE/ASM) with
a single set of X-ray colors defined using data available only in
pre-determined energy bands. We test a selection of X-ray colors with a more
sensitive instrument to determine the reliability of this method. We use data
from the MAXI Gas Slit Camera, which allows users to specify energy-bands. We
test X-ray colors that have been previously defined in the literature as well
as ones that we define specifically in this paper. A representative set of
systems are used to construct Color-Color-Intensity diagrams in each set of
colors to determine which are best for separating different classes. For
studying individual sources certain bands are more effective than others. For a
specified energy range, the separation of soft states in black hole binaries
was possible only where both soft and hard colors included information from the
lowest energy band. We confirm that Color-Color-Intensity diagrams can
distinguish between systems containing black holes or neutron stars in all
X-ray colors tested; this suggests an universality in the accretion processes
governing these different classes. We suggest possible physical processes
driving different classes of X-ray binaries to different locations in
Color-Color-Intensity diagrams. | | Source: | arXiv, 2007.5810 | | Services: | Forum | Review | PDF | Favorites | |
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