Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741705a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #417.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Hot gaseous haloes are predicted around all large galaxies as an effect of galaxy formation, forming a source of material for accretion. However, such hot haloes have never been detected at distances beyond a few kpc around a spiral galaxy. We used the Chandra ACIS-I instrument to look for diffuse X-ray emission around an ideal candidate galaxy: the isolated giant spiral NGC 1961. We observed four quadrants around the galaxy for 30 ks each, carefully subtracted background emission and point source emission, and found diffuse emission that appears to extend to at least 50 kpc. We fit β-models to the emission, and estimate a total hot halo mass of 5.3-6.0×1010 M&sun; out to 500 kpc. This is a large reservoir of hot gas, but falls significantly below observational upper limits set by pervious searches, and suggests that NGC 1961 is missing 85% of its baryons relative to the cosmic mean -- a surprising defecit for such a massive structure.
Anderson Michael
Bregman Joel N.
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