The ultraluminous X-ray sources of NGC 4485/4490

Details The ultraluminous X-ray sources of NGC 4485/4490 The ultraluminous X-ray sources of NGC 4485/4490

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1489r&link_type=abstract

Chandra Proposal ID #05600530

Physics

Chandra Proposal Id #05600530

Scientific paper

An earlier Chandra observation has shown that the nearby (d = 7.8 Mpc) interacting galaxy pair, NGC 4485/90, contains no less than six ultraluminous X-ray sources (ULX). Here we propose two new 40 ks observations of this system, separated by a period of 2 - 4 months, which will provide us with the key X-ray spectral and temporal information necessary for a better understanding of this exotic class of object. For example, the new data will provide spectral variability diagnostics that could identify microquasar-like objects amongst the six ULX. Similarly the ULX spectra will be of sufficient quality to place constraints on the presence of "cool" accretion discs, a likely signature of an underlying intermediate-mass black hole.

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