The Remarkably Steady Nature of Luminous LMXBs in Elliptical Galaxies

Details The Remarkably Steady Nature of Luminous LMXBs in Elliptical Galaxies The Remarkably Steady Nature of Luminous LMXBs in Elliptical Galaxies

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2475i&link_type=abstract

Chandra Proposal ID #09620187

Computer Science

Chandra Proposal Id #09620187

Scientific paper

Multi-epoch Chandra observations of two elliptical galaxies have shown that the most luminous LMXBs are remarkably steady, with none of the 33 >8e38 ergs/s sources in both galaxies having turned off in a 3-5 yr timespan. As a group, the minimum outburst duration must be at least 50 yr such that all of the sources remained on during this time. The two most likely explanations for this behavior is they are transient long-period, wide-orbit red giant black hole LMXBs like GRS1915+105, or persistent ultracompact black hole LMXBs. We propose to reobserve NGC1399 to establish an 8-yr baseline for monitoring its luminous sources. Along with archival data of M87, this will place stringent limits on their outburst duration to distinguish between the two competing scenarios.

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