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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Monitoring the very-long-term variability of X-ray sources in the giant elliptical galaxy M87
Monthly Notices of the Royal Astronomical Society, Volume 432, No. 2, Year 2013
Notification
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Description
We report on our search for very-long-term variability (weeks to years) in X-ray binaries(XRBs) in the giant elliptical galaxy M87. We have used archival Chandra imaging observations to characterize the long-term variability of eight of the brightest members of the XRB population in M87. The peak brightness of some of the sources exceeded the ultraluminous X-ray source (ULXs) threshold luminosity of ~1039 erg s-1, and one source could exhibit dips or eclipses. We show that for one source, if it has similar modulation amplitude as in SS433, then period recoverability analysis on the current data would detect periodic modulations, but only for a narrow range of periods less than 120 d. We conclude that a dedicated monitoring campaign, with appropriately defined sampling, is essential if we are to investigate properly the nature of the long-term modulations such as those seen in Galactic sources. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Foster, D. L.
South Africa, Cape Town
South African Astronomical Observatory
United States, Nashville
Vanderbilt University
Charles, Philip A.
United Kingdom, Southampton
University of Southampton
Swartz, Douglas A.
United States, Huntsville
Huntsville Program Office
Misra, Ranjeev
India, Pune
Inter-university Centre for Astronomy and Astrophysics India
Stassun, Keivan Guadalupe
United States, Nashville
Vanderbilt University
United States, Nashville
Fisk University
Statistics
Citations: 5
Authors: 5
Affiliations: 6
Identifiers
Doi:
10.1093/mnras/stt557
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study