Infrared dust emission in the outer disk of M51

Details Infrared dust emission in the outer disk of M51 Infrared dust emission in the outer disk of M51

2006-10-09

arxiv.org/abs/astro-ph/0610256v1

Astrophys.J.651:L101-L105,2006

Astronomy and Astrophysics

Astrophysics

13 pages in manuscript form, 2 figures; download PDF of manuscript with original-resolution Figure 1 at http://www.eg.buckne

Scientific paper

10.1086/509719

We examine faint infrared emission features detected in Spitzer Space Telescope images of M51, which are associated with atomic hydrogen in the outer disk and tidal tail at R greater than R_25 (4.9', ~14 kpc at d=9.6 Mpc). The infrared colors of these features are consistent with the colors of dust associated with star formation in the bright disk. However, the star formation efficiency (as a ratio of star formation rate to neutral gas mass) implied in the outer disk is lower than that in the bright disk of M51 by an order of magnitude, assuming a similar relationship between infrared emission and star formation rate in the inner and outer disks.

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