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Title:
The Spitzer Space Telescope First Look Survey: Neutral Hydrogen Emission
Authors:
Lockman, Felix J.; Condon, J. J.
Affiliation:
AA(National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944; ), AB(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903; )
Publication:
The Astronomical Journal, Volume 129, Issue 4, pp. 1968-1977. (AJ Homepage)
Publication Date:
04/2005
Origin:
UCP
AJ Keywords:
Galaxy: Structure, Infrared: ISM, Radio Lines: ISM, Surveys
DOI:
10.1086/428483
Bibliographic Code:
2005AJ....129.1968L

Abstract

The Spitzer Space Telescope (formerly SIRTF) extragalactic First Look Survey covered about 5 deg2 centered on (J2000.0) α=17h18m, δ=59deg30' in order to characterize the infrared sky with high sensitivity. We used the 100 m Green Bank Telescope to image the 21 cm Galactic H I emission over a 3deg×3deg square, covering this position with an effective angular resolution of 9.8 arcmin and a velocity resolution of 0.62 km s-1. In the central square degree of the image the average column density is NHI=2.5×1020 cm-2 with an rms fluctuation of 0.3×1020 cm-2. The Galactic H I in this region has a very interesting structure. There is a high-velocity cloud, several intermediate-velocity clouds (one of which is probably part of the Draco Nebula), and narrow-line low-velocity filaments. The H I emission shows a strong and detailed correlation with dust. Except for the high-velocity cloud, all features in the NH I map have counterparts in an E(B-V) map derived from infrared data. Relatively high E(B-V)/NH I ratios in some directions suggest the presence of molecular gas. The best diagnostic of such regions is the peak H I line brightness temperature, not the total NH I: directions where Tb>12 K have E(B-V)/NH I significantly above the average value. The data corrected for stray radiation have been released via the World Wide Web.
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