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Infrared dust emission in the outer disk of M51

Michele D. Thornley·Jonathan Braine·Erwan Gardan
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Abstract

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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Michele D. Thornley, Jonathan Braine, Erwan Gardan. 2006-10-09. Infrared dust emission in the outer disk of M51. https://doi.org/10.1086/509719

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