Properties of star-forming galaxies in mid-infrared range from the data obtained with the space telescope WISE

1Izotova, IY, 2Izotov, YI
1Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
2Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2019, 35(6):5-17
Start Page: Extragalactic Astronomy
Language: Russian

We study photometric properties in the mid-infrared range of a sample of compact star-forming galaxies from the Data Release 14 of the SDSS. The sample includes about 30000 galaxies. The emist ion lines Hβ with equivafent widths EW(Hβ) > 1 nm are observed in spectra of all selected galaxfes. Sefected galaxfes are compact objects with anguf ar diameters less than 6 arcsec. About 10000 galaxies were detected by the space telescope WISE at wavelengths 3.4 and 4.6 pm. Considerable number of galaxies was also detected at wavelengths 12 and 22 pm. Using these data and the results of observations obtained in the ultraviolet range with the space telescope GALEX it was shown that the dust heating in the sample galaxies is caused by the ultraviolet radiation of massive stars in star-forming regions. The stellar and ionized gas emission dominates at wavelengths 3.4 and 4.6 pm in majority of galaxies whereas the dust emission dominates at wavelengths 12 and 22 pm. In some galaxies with high Hβ luminosity dust emission is observed even at the wavelength 3.4 pm, and it has a steep increase of the intensity toward the wavetength 4.6 pm. This emission is characterized by red color (W1 - W2 > 2m), where W1 and W2 are magnitudes at wavet engths 3.4 and 4.6 pm, respectively. The probable cause of this emission is the presence of hot dust with a temperature of hundreds Kelvins. We present the list of 39 galaxies with such an extremely high red color W1 - W2.

Keywords: dwarf star-forming galaxies, H II regions, infrared radiation, interstellar dust

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