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Title:
Spitzer IRAC Detection and Analysis of Shocked Molecular Hydrogen Emission
Authors:
Ybarra, Jason E.; Lada, Elizabeth A.
Affiliation:
AA(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA ), AB(Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA)
Publication:
The Astrophysical Journal Letters, Volume 695, Issue 1, pp. L120-L123 (2009). (ApJL Homepage)
Publication Date:
04/2009
Origin:
IOP
ApJ Keywords:
ISM: individual: HH 54, ISM: jets and outflows, ISM: lines and bands
DOI:
10.1088/0004-637X/695/1/L120
Bibliographic Code:
2009ApJ...695L.120Y

Abstract

We use statistical equilibrium equations to investigate the Infrared Array Camera (IRAC) color space of shocked molecular hydrogen. The location of shocked H2 in [3.6] - [4.5] versus [4.5] - [5.8] color is determined by the gas temperature and density of neutral atomic hydrogen. We find that high excitation H2 emission falls in a unique location in the color-color diagram and can unambiguously be distinguished from stellar sources. In addition to searching for outflows, we show that the IRAC data can be used to map the thermal structure of the shocked gas. We analyze archival Spitzer data of Herbig-Haro object HH 54 and create a temperature map, which is consistent with spectroscopically determined temperatures.
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