منابع مشابه
MACHOs AND MOLECULAR CLOUDS IN GALACTIC HALOS
Recent observations of microlensing events in the Large Magellanic Cloud by the MACHO and EROS collaborations suggest that an important fraction of the galactic halo is in the form of Massive Astrophysical Compact Halo Objects (MACHOs) with mass ∼ 0.1M⊙. We outline a scenario in which dark clusters of MACHOs and molecular clouds form in the halo at galactocentric distances larger than ∼ 10 − 20...
متن کاملStudies of molecular clouds at the Galactic centre
Interstellar molecular clouds play an essential role in the Universe. Such clouds are invoked for the production and destruction of stars, galaxies and gas and also for energy transport in galaxies. The Galaxy, or the Milky Way, is a large spiral galaxy, with a central bar structure, that harbours a few hundred billion stars and large amounts of gas and dust. At the centre of the Galaxy, a 4 mi...
متن کاملStar Formation and Molecular Clouds towards the Galactic Anti-Center
The Galactic Anticenter region hosts a a number of massive molecular cloud complexes, some of which are currently actively forming stars. Two major OB associations, Gem OB1 and Aur OB1, are found in this direction, each with numerous massive stars and a supernova remnant. The dominant region of star formation is centered around the Sh 2-235 complex and the nearby regions AFGL 5142, 5144, and 51...
متن کاملThe Hydrogen Clouds in the Galactic Halo
New 21cm observations with the Green Bank Telescope (GBT) show that a significant fraction of the HI in the inner Galaxy’s halo ∼ 1 kpc from the midplane exists in the form of discrete clouds. Some look very much like a Spitzer (1968) “standard” diffuse cloud but with their HI in two phases. They mark the transition between the neutral disk and the highly ionized halo. The dominant motion of th...
متن کاملHi Clouds beyond the Galactic Disk
Recent observations in the 21cm line with the Green Bank Telescope have changed our view of the neutral interstellar medium (ISM) in several ways. The new data show that in the inner parts of the Milky Way the disk-halo interface is composed of many discrete HI clouds. The clouds lie in a layer more than one kpc thick and follow Galactic rotation. Their origin and evolution is unknown. In the o...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1983
ISSN: 0074-1809
DOI: 10.1017/s0074180900032381