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Date and Time of the Query: 2019-05-21 T05:31:22 PDT
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For refcode 2006ApJ...653.1129B:
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Copyright by American Astronomical Society. Reproduced by permission
2006ApJ...653.1129B The Mid-Infrared Properties of Starburst Galaxies from Spitzer-IRS Spectroscopy B. R. Brandl, J. Bernard-Salas, H. W. W. Spoon, D. Devost, G. C. Sloan, S. Guilles, Y. Wu, J. R. Houck, D. W. Weedman, L. Armus, P. N. Appleton, B. T. Soifer, V. Charmandaris, L. Hao, J. A. Marshall, S. J. Higdon, and T. L. Herter Abstract. We present 5 -- 38 micron mid-infrared spectra at a spectral resolution of R~65 -- 130 of a large sample of 22 starburst nuclei taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. The spectra show a vast range of starburst SEDs. The silicate absorption ranges from essentially no absorption to heavily obscured systems with an optical depth of {tau}_9.8micron_~5. The spectral slopes can be used to discriminate between starburst and AGN powered sources. The monochromatic continuum fluxes at 15 and 30 micron enable a remarkably accurate estimate of the total infrared luminosity of the starburst. We find that the PAH equivalent width is independent of the total starburst luminosity L_IR_ as both continuum and PAH feature scale proportionally. However, the luminosity of the 6.2 micron feature scales with L_IR_ and can be used to approximate the total infrared luminosity of the starburst. Although our starburst sample covers about a factor of 10 difference in the [Ne III]/[Ne II] ratio, we found no systematic correlation between the radiation field hardness and the PAH equivalent width or the 7.7 micron/11.3 micron PAH ratio. These results are based on spatially integrated diagnostics over an entire starburst region, and local variations may be "averaged out." It is presumably due to this effect that unresolved starburst nuclei with significantly different global properties appear spectrally as rather similar members of one class of objects. Key words: Galaxies: Starburst, Infrared: Galaxies =========================================================================== 2007ApJ...665..884B Erratum: "The Mid-Infrared Properties of Starburst Galaxies from Spitzer-IRS Spectroscopy" (ApJ, 653, 1129 [2006]) B. R. Brandl, J. Bernard-Salas, H. W. W. Spoon, D. Devost, G. C. Sloan, S. Guilles, Y. Wu, J. R. Houck, D. W. Weedman, L. Armus, P. N. Appleton, B. T. Soifer, V. Charmandaris, L. Hao, J. A. Marshall, S. J. Higdon, and T. L. Herter Because of an error at the Press, bottom axis labels are incorrect in Figures 3, 6, and 10; the "2" has strayed from the "0" in what should be "20" in all three figures. Corrected figures are given here. The Press sincerely regrets this error. ===========================================================================
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