Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2005f&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #20.05; Bulletin of the American Astronomical Society, Vol. 27, p.834
Astronomy and Astrophysics
Astronomy
Scientific paper
During the Astro-2 mission in March of 1995, the Hopkins Ultraviolet Telescope (HUT) was used to conduct a sensitive search for far-UV emission lines from hot gas in the halo of NGC 4631. This galaxy has a strong radio continuum emission, extended H alpha emission, and soft X-ray emission from an extended halo. Recent ROSAT observations indicate that much of the X-ray emission comes from a very soft component, with temperature less than 6 times 10(5) K. Gas cooling through this temperature range should show emission in the prominent O VI lambda lambda 1032,1038 and C IV lambda lambda 1548,1550 lines. The HUT observations probe a portion of the halo 39 arcseconds (corresponding to 1.4 kpc for at distance of 7.5 Mpc) south of the disk, through a 11 times 56('') aperture. Neither emission line was detected. Implications for galactic fountain models will be discussed. This work was supported by NASA contract NAS 5-27000 to the Johns Hopkins University and through grant HF1043 awarded by the STScI which is operated by AURA, Inc., for NASA under contract NAS5-26555.
Davidsen Arthur F.
Dixon William V.
Ferguson Harry
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