Galactic structure and stellar clusters in obscured Hll regions.
نویسندگان
چکیده
منابع مشابه
The Stellar Content of Obscured Galactic Giant1 H II Regions: I. W43
Near infrared images of the Galactic giant H II region W43 reveal a dense stellar cluster at its center. Broad band JHK photometry of the young cluster and K−band spectra of three of its bright stars are presented. The 2 μm spectrum of the brightest star in the cluster is very well matched to the spectra of Wolf–Rayet stars of sub–type WN7. Two other stars are identified as O type giants or sup...
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We present near infrared J, H, and K images and K−band spectroscopy in the giant H II region W42. A massive star cluster is revealed; the color–color plot and K−band spectroscopic morphology of two of the brighter objects suggest the presence of young stellar objects. The spectrum of the bright central star is similar to unobscured stars with MK spectral types of O5–O6.5. If this star is on the...
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The Milky Way Galaxy offers a unique opportunity for testing theories of galaxy formation and evolution. I discuss how large surveys, both photometric and spectroscopic, of Galactic stars are the keystones of investigations into such fundamental problems as the merging history – and future – of the Galaxy.
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Most of the local active galactic nucleus (AGN) population is obscured and much of the Xray background originates in obscured AGNs. The contribution of obscured accretion to the growth of massive black holes is discussed here. The recent identification of significant samples of the X-ray sources that dominate the X-ray background intensity has shown a redshift peak at 0.7–0.8, rather than the r...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2006
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/54/1/038