HI and optical studies of Wolf-Rayet galaxies
نویسندگان
چکیده
منابع مشابه
Uv Excess Galaxies: Wolf-rayet Galaxies
We discuss V and R band photometry for 67% of the Sullivan et al. (2000) SA57 ultraviolet-selected galaxy sample. In a sample of 176 UV-selected galaxies, Sullivan et al. (2000) find that 24% have (UV-B) colors too blue for consistency with starburst spectral synthesis models. We propose that these extreme blue, UV excess galaxies are Wolf-Rayet (WR) galaxies, starburst galaxies with strong UV ...
متن کاملStarbursts in barred spiral galaxies II. Molecular and optical study of three Wolf-Rayet galaxies?
We have searched for dense molecular gas in three barred spiral galaxies with young starbursts, NGC 3049, 5430 and 6764, which are known Wolf-Rayet galaxies. We detected HCN in the latter two, and CS was marginally detected in NGC 6764. The dense molecular gas contents of the three galaxies are compared to those of other galaxies and to other indicators of star formation. The HCN luminosities (...
متن کاملMassive Star Populations in Wolf-Rayet Galaxies
We analyze longslit spectral observations of fourteen Wolf-Rayet galaxies from the sample of Schaerer, Contini & Pindao (1999). All 14 galaxies show broad Wolf-Rayet emission in the blue region of the spectrum, consisting of a blend of NIIIλ4640, CIIIλ4650, CIVλ4658, and HeIIλ4686 emission lines, which is a spectral characteristic of WN stars. Broad CIVλ5808 emission, termed the red bump, is de...
متن کاملWolf-Rayet wind structure and optical variability
Results are presented on the expected variability of Wolf-Rayet (WR) stars in broad-band optical polarimetry and photometry, and in emission line profiles, due to an inhomogeneous random distribution of blobs in spherical geometry. Time dependent 3−D simulations are carried out with blob ejection random in time and direction, and the radiation properties are evaluated in the optically thin limi...
متن کاملDeep optical imaging and spectroscopy of a sample of Wolf–Rayet galaxies
We present results of narrow-band (Hα and adjacent continuum) and broad-band (U , B and V ) optical CCD imaging together with highand intermediate-resolution optical spectroscopy for a sample dwarf and/or irregular Wolf–Rayet (WR) galaxies with absolute B magnitudes in the range −14 to −22 mag, taken from the catalogue of Conti (1991). We find that the recent star formation processes in the gal...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2012
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921313000914