A Detection of Cold Dust in the Extended Disks of Nearby Field Galaxies

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present the detection of 100mu m emission at large radii ( ~ 30 kpc) in two independent samples of nearby galaxies. Our aims are to test for the existence of dust at large radii in galaxies and to use the dust as a tracer of an extended baryonic component. From the IRAS 100mu m Sky Survey images, we construct two samples. First, we add the flux from 90 nearby (v < 6000 km/s) field galaxies, selected from the RC3 catalog to be of similar size (5 arcmin <= D25 <= 10 arcmin), and luminosity (-22.5 <= Mb <= -18), and selected to be isolated in the 100mu m images to minimize contamination due to galactic cirrus or close companion galaxies. Using the data from the RC3, these galaxies are scaled by their D25, rotated according to their major axis position angle, coadded, and rebinned into polar coordinates to produce maps of 100mu m emission as a function of radius and azimuthal angle. We apply the same procedure to a sample of 24 very nearby galaxies (v < 1500 km/s, D25 >= 10 arcmin). In both samples, we find 100mu m emission out to radii of ~ 30 kpc that is preferentially elongated along the major axis. We discuss some implications of this detection of extended 100mu m emission.

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