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Infrared spectral properties of wolf-rayet galaxies

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We present infrared properties of 22 WR galaxies having optical classifications as Starburst Galaxies and having Spitzer IRS mid-infrared spectra available from CASSIS. To understand infrared properties of these galaxies we have compared our sample with two independent ultraviolet-selected starburst galaxy samples. We have compared the hardness of radiation of these three samples, using the ratio of total fluxes of [NeIII] 15.55 μm and PAH 11.3 μm , which shows a presence of younger stars in WR galaxies, compared to other UV samples. We also have calibrated the IR and UV SFRs. Our results show that the ~35% of the UV luminosity of WR SB galaxies is observed, compared to ~9% and ~25% of other UV samples. We determine that the classification of objects to pure SB based on criteria EW(6.2μm)> 0.4μm is not applicable for SB galaxies with the youngest star populations.

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Correspondence to J. R. Martirosian.

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Translated from Astrofizika, Vol. 55, No. 3, pp. 337–348 (August 2012).

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Martirosian, J.R., Sargsyan, L.A. Infrared spectral properties of wolf-rayet galaxies. Astrophysics 55, 306–316 (2012). https://doi.org/10.1007/s10511-012-9237-6

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  • DOI: https://doi.org/10.1007/s10511-012-9237-6

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