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Chemical Rates on Small Grains and PAHs: C^+ Recombination and H_2 Formation
Mark G. Wolfire, A. G. G. M. Tielens, David Hollenbach +1
We use observations of the CI, CII, HI, and H_2 column densities along lines of sight in the Galactic plane to determine the formation rate of H_2 on grains and to determine chemic…
Warm Molecular Gas in M51: Mapping the Excitation Temperature and Mass of H_2 with the Spitzer Infrared Spectrograph
G. Brunner, K. Sheth, L. Armus +7
We have mapped the warm molecular gas traced by the H_2 S(0) - H_2 S(5) pure rotational mid-infrared emission lines over a radial strip across the nucleus and disk of M51 (NGC 5194…
Embedded Star Formation in the Eagle Nebula with Spitzer/GLIMPSE
R. Indebetouw, T. R. Robitaille, B. A. Whitney +5
We present new Spitzer photometry of the Eagle Nebula (M16, containing the optical cluster NGC 6611) combined with near-infrared photometry from 2MASS. We use dust radiative transf…
A PDR-Code Comparison Study
M. Roellig, N. P. Abel, T. Bell +21
We present a comparison between independent computer codes, modeling the physics and chemistry of interstellar photon dominated regions (PDRs). Our goal was to understand the mutua…
The Frequency of Mid-Infrared Excess Sources in Galactic Surveys
B. Uzpen, H. A. Kobulnicky, A. J. Monson +27
We have identified 230 Tycho-2 Spectral Catalog stars that exhibit 8 micron mid-infrared extraphotospheric excesses in the MidCourse Space Experiment (MSX) and Spitzer Space Telesc…
Absolute diffuse calibration of IRAC through mid-infrared and radio study of HII regions
Martin Cohen, Anne J. Green, Marilyn R. Meade +9
We investigate the diffuse absolute calibration of the InfraRed Array Camera on the Spitzer Space Telescope at 8.0microns using a sample of 43 HII regions with a wide range of morp…