Computer Science – Performance
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.7006b&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #70.06; Bulletin of the American Astronomical Society, Vol. 30, p.926
Computer Science
Performance
3
Scientific paper
We present near-infrared images of the nearby edge-on spiral galaxy NGC 4565 in a search for infrared emission from baryonic dark matter in the massive galactic halo. The observation was made with a liquid-helium-cooled rocket-borne telescope using a low-background 256 x 256 InSb focal plane array. The field of view subtended 1.2 x 1.2 degrees with 17" pixels to map extended emission out to large radii and to accurately measure and subtract the sky brightness. The images achieve near-background-limited performance at 3.5 - 5.5 mu m where emission from the zodiacal foreground is at a minimum. We are able to map the surface brightness of the galaxy to < 0.5 nW/m(2) sr (0.2 % of the zodiacal foreground). By measuring the surface brightness as a function of radius, we do not detect a component associated with the massive halo, obtaining a lower limit on the mass-to-light ratio of the halo M/L > 250. This observation places strong contraints on the fraction of stars near the hydrogen-burning limit in the galactic halo.
Bock James Joseph
Kawada Mitsunobu
Lange Andrew E.
Matsumoto Toshio
Uemizu Kazunori
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