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Properties of Star-Forming Galaxies in the Mid-Infrared Range from the Data Obtained with the WISE Space Telescope
Kinematics and Physics of Celestial Bodies ( IF 0.5 ) Pub Date : 2020-01-09 , DOI: 10.3103/s0884591319060035 I. Y. Izotova , Y. I. Izotov
中文翻译:
从WISE太空望远镜获得的数据来看,中红外范围内的恒星形成星系的性质
更新日期:2020-01-09
Kinematics and Physics of Celestial Bodies ( IF 0.5 ) Pub Date : 2020-01-09 , DOI: 10.3103/s0884591319060035 I. Y. Izotova , Y. I. Izotov
Abstract
We study the mid-infrared photometric properties of a sample of compact star-forming galaxies from the SDSS Data Release 14. The sample includes about 30 000 galaxies. The Hβ emission lines with equivalent widths EW(Hβ) > 1 nm are observed in the spectra of all selected galaxies. The selected galaxies are compact objects with angular diameters less than 6 arcsec. About 10 000 galaxies were detected by the WISE space telescope at wavelengths of 3.4 and 4.6 μm. A considerable number of galaxies was also detected at wavelengths of 12 and 22 μm. Using these data and the results of observations obtained in the ultraviolet range with the GALEX space telescope, it was shown that the heating of dust in the sample of galaxies is caused by the ultraviolet radiation of massive stars in the star-forming regions. The stellar and ionized-gas emission dominates at wavelengths of 3.4 and 4.6 μm in a majority of galaxies, whereas the dust emission dominates at wavelengths of 12 and 22 μm. In some galaxies with high Hβ luminosity, dust emission is observed even at the short wavelength of 3.4 μm, and it has a steep increase in the intensity toward the wavelength of 4.6 μm. This emission is characterized by “red” color (W1 – W2 > 2m), where W1 and W2 are magnitudes at wavelengths of 3.4 and 4.6 μm, respectively. The probable cause of this emission is the presence of hot dust with a temperature of hundreds of Kelvins. A list of 39 galaxies with such an extremely high W1 – W2 color index is presented.中文翻译:
从WISE太空望远镜获得的数据来看,中红外范围内的恒星形成星系的性质