HIPASS High-Velocity Clouds: Properties of the Compact and Extended Populations
نویسندگان
چکیده
منابع مشابه
Compact High Velocity Clouds
We summarize the observed properties of the CHVC population, which provide strong evidence for source distances in the range 200– 1000 kpc. At these distances, the population corresponds to strongly dark-matter dominated sub-dwarf galaxies still accreting onto the more massive Local Group systems. Recent searches for faint associated stellar populations have revealed red-giant candidates for wh...
متن کاملCompact High–velocity Clouds at High Resolution
Six examples of the compact, isolated high–velocity clouds catalogued by Braun & Burton (1999) and identified with a dynamically cold ensemble of primitive objects falling towards the barycenter of the Local Group have been imaged with the Westerbork Synthesis Radio Telescope; an additional ten have been imaged with the Arecibo telescope. The imaging reveals a characteristic core/halo morpholog...
متن کاملArecibo imaging of compact high–velocity clouds
Ten isolated compact high–velocity clouds (CHVCs) of the type cataloged by Braun & Burton (1999) have been imaged with the Arecibo telescope and were found to have a nested core/halo morphology. We argue that a combination of high–resolution filled–aperture and synthesis data is crucial to determining the intrinsic properties of the CHVCs. We identify the halos as Warm Neutral Medium surroundin...
متن کاملHigh–resolution imaging of compact high–velocity clouds
Six examples of the compact, isolated H i high–velocity clouds (CHVCs) identified by Braun and Burton (1999), but only marginally resolved in single–dish data, have been imaged with the Westerbork Synthesis Radio Telescope. The 65 confirmed objects in this class define a dynamically cold system, with a global minimum for the velocity dispersion of only 70 km s, found in the Local Group Standard...
متن کاملThe Absence of Stars in Compact High-velocity Clouds
We present the results of our search for faint Local Group dwarf galaxies in compact high-velocity clouds (HVCs). We used digitized Palomar Observatory Sky Survey (POSS) data to examine 1 square degree of sky around each of ∼ 250 northern hemisphere HVCs. The POSS images were processed to remove foreground stars and large-scale backgrounds, smoothed to enhance arcminute-sized low surface bright...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2002
ISSN: 0004-6256,1538-3881
DOI: 10.1086/338088