The Galactic Worm GW 123.4−1.5: A Mushroom-shaped H [CLC][CSC]i[/CSC][/CLC] Cloud
نویسندگان
چکیده
منابع مشابه
How was the mushroom - shaped GW 123 . 4 – 1 . 5 formed in the Galactic disk ?
The unusual mushroom-shaped HI cloud, GW 123.4–1.5, is hundreds of parsecs in size but does not show any correlations to HI shells or chimney structures. To investigate the origin and velocity structure of GW 123.4–1.5, we perform three-dimensional hydrodynamical simulations of the collision of a high-velocity cloud with the Galactic disk. We also perform a parameter study of the density, radiu...
متن کاملA Mushroom-shaped Structure from the Impact of a Cloud with the Galactic Disk
We propose that the mushroom-shaped structure of the Galactic worm GW 123.4–1.5 is created by a cloud collision with the Galactic gas disk. A hydrodynamic simulation shows that a mushroom-shaped structure is created after the cloud crosses the Galactic midplane. The lifetime of the mushroom-shaped structure is of order the dynamical time scale of the disk, ∼ 10 years. We find that the velocitie...
متن کاملar X iv : a st ro - p h / 00 03 08 1 v 1 6 M ar 2 00 0 Galactic Worm 123 . 4 - 1 . 5 : A Mushroom - shaped HI Cloud
The Dominion Radio Astrophysical Observatory’s Synthesis Telescope provides the highest resolution data (1 arcmin and 0.82 km s) to date of an H I worm candidate. Observed as part of the Canadian Galactic Plane Survey, mushroom-shaped GW 123.4-1.5 extends only a few hundred parsecs, contains ∼ 10 M⊙ of neutral hydrogen, and appears unrelated to a conventional shell or chimney structure. Our pre...
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Recent Hi emission observations of the Southern Galactic hemisphere have revealed a mushroom-like structure extending from z = −70 to −450 pc, composed of a stem and a cap. Similar structures occur in three-dimensional simulations of a dynamic galactic disk driven by isolated and clustered supernovae. Using these simulations, we show that hot gas in the Galactic disk that is not evacuated throu...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2000
ISSN: 0004-637X
DOI: 10.1086/312592