Preliminary evidence for dust in galactic halos

Details Preliminary evidence for dust in galactic halos Preliminary evidence for dust in galactic halos

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..165z&link_type=abstract

Dark matter. AIP Conference Proceedings, Volume 336, pp. 165-167 (1995).

Computer Science

Dark Matter, Visible, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Galactic Halos

Scientific paper

I use B and I photometry of distant galaxies observed through the halos of two nearby spiral galaxies, NGC 2835 and NGC 3521, to test for the existence of dust in galactic halos out to at least a radius of 60 kpc. B-I colors of background galaxies in fields centered along the nearby galaxy's major axis at a projected separation of 60 kpc are compared to the colors of background galaxies in fields centered at a projected separation of about 220 kpc. Background galaxies in the fields at smaller projected separations have average B-I colors that are 0.067+/-0.033 mag redder than those in the outer fields. Such a result will occur by chance less than 2.2% of the time and so is taken as preliminary evidence that galaxy halos contain more dust at galactic radii of 60 kpc than 220 kpc.

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