scholarly journals A CATALOG OF ULTRA-COMPACT HIGH VELOCITY CLOUDS FROM THE ALFALFA SURVEY: LOCAL GROUP GALAXY CANDIDATES?

2013 ◽  
Vol 768 (1) ◽  
pp. 77 ◽  
Author(s):  
Elizabeth A. K. Adams ◽  
Riccardo Giovanelli ◽  
Martha P. Haynes
Keyword(s):  
High Velocity ◽  
Local Group ◽  
High Velocity Clouds ◽  
Group Galaxy ◽  
Local Group Galaxy

scholarly journals High-Velocity Clouds and the Local Group

2004 ◽  
Vol 217 ◽  
pp. 2-11 ◽  
Author(s):  
B. P. Wakker
Keyword(s):  
High Velocity ◽  
Milky Way ◽  
Local Group ◽  
Current Data ◽  
The Other ◽  
Hot Gas ◽  
Neutral Gas ◽  
Hα Emission ◽  
M 31 ◽  
High Velocity Clouds

I examine some of the evidence relevant to the idea that high-velocity clouds (HVCs) are gas clouds distributed throughout the Local Group, as proposed by Blitz et al. (1999) and Braun & Burton (1999). This model makes several predictions: a) the clouds have low metallicities; b) there should be no detectable Hα emission; c) analogues near other galaxies should exist; and d) many faint HVCs in the region around M 31 can be found. Low metallicities are indeed found in several HVCs, although they are also expected in several other models. Hα emission detected in most HVCs and, when examined more closely, distant (D>200 kpc) HVCs should be almost fully ionized, implying that most HVCs with H I must lie near the Milky Way. No clear extragalactic analogues have been found, even though the current data appear sensitive enough. The final prediction (d) has not yet been tested. on balance there appears to be no strong evidence for neutral gas clouds distributed throughout the Local Group, but there may be many such clouds within 100 or so kpc from the Milky Way (and M31). on the other hand, some (but not all) of the high-velocity O VI recently discovered may originate in hot gas distributed throughout the Local Group.

scholarly journals Morphological Characteristics of Compact High-Velocity Clouds Revealed by High-Resolution WSRT Imaging

2000 ◽  
Vol 174 ◽  
pp. 136-147
Author(s):  
W. B. Burton ◽  
R. Braun
Keyword(s):  
Dark Matter ◽  
High Resolution ◽  
High Velocity ◽  
Physical State ◽  
Local Group ◽  
Morphological Characteristics ◽  
Kinetic Temperature ◽  
High Resolution Imaging ◽  
Resolution Imaging ◽  
High Velocity Clouds

AbstractA class of compact, isolated high–velocity clouds which plausibly represents a homogeneous subsample of the HVC phenomenon in a single physical state was objectively identified by Braun and Burton (1999). Six examples of the CHVCs, unresolved in single–dish data, have been imaged with the Westerbork Synthesis Radio Telescope. The high–resolution imaging reveals the morphology of these objects, including a core/halo distribution of fluxes, signatures of rotation indicating dark matter, and narrow linewidths constraining the kinetic temperature of several opaque cores. In these regards, as well as in their kinematic and spatial deployment on the sky, the CHVC objects are evidently a dynamically cold ensemble of dark–matter–dominated H ɪ clouds accreting onto the Local Group in a continuing process of galactic evolution.

UGC-A86 - A local group galaxy candidate

1991 ◽  
Vol 101 ◽  
pp. 465 ◽  
Author(s):  
A. Saha ◽  
John G. Hoessel
Keyword(s):  
Local Group ◽  
Group Galaxy ◽  
Local Group Galaxy

Is LGS 2 a Local Group galaxy

1981 ◽  
Vol 93 ◽  
pp. 35 ◽  
Author(s):  
S. van den Bergh ◽  
R. Racine
Keyword(s):  
Local Group ◽  
Group Galaxy ◽  
Local Group Galaxy

XMM-Newton survey of the Local Group galaxy M 33 – catalogue results and global properties

2005 ◽  
Vol 1 (S230) ◽  
pp. 160-161
Author(s):  
Z. Misanovic ◽  
W. Pietsch ◽  
F. Haberl ◽  
M. Ehle ◽  
D. Hatzidimitriou ◽  
...  
Keyword(s):  
Local Group ◽  
Global Properties ◽  
Group Galaxy ◽  
Local Group Galaxy

scholarly journals XMM-Newton survey of the Local Group galaxy M 33

2004 ◽  
Vol 426 (1) ◽  
pp. 11-24 ◽  
Author(s):  
W. Pietsch ◽  
Z. Misanovic ◽  
F. Haberl ◽  
D. Hatzidimitriou ◽  
M. Ehle ◽  
...  
Keyword(s):  
Local Group ◽  
Group Galaxy ◽  
Local Group Galaxy

scholarly journals B-supergiants in IC1613: testing low-Z massive star physics and evolution

2016 ◽  
Vol 12 (S329) ◽  
pp. 389-389
Author(s):  
Inés Camacho ◽  
Miriam García ◽  
Miguel A. Urbaneja ◽  
Artemio Herrero
Keyword(s):  
Massive Star ◽  
Local Group ◽  
Uv Spectroscopy ◽  
Physical Parameters ◽  
Physical Processes ◽  
Life And Death ◽  
The Galaxy ◽  
Nearby Galaxies ◽  
Group Galaxy ◽  
Local Group Galaxy

AbstractThe physical processes taking place in massive stars during their life and death are highly dependent on the metallicity (Z) of their parent cloud. Observations of these stars in low-Z nearby galaxies are crucial to understand these processes. IC1613 is the nearest Local Group galaxy with ongoing star formation and O-abundance lower than the SMC, although UV spectroscopy suggests it is not so metal poor. We performed a spectral analysis of early B-type stars in the galaxy, obtaining physical parameters and abundances. Our results confirm the low O-abundance of IC1613.

scholarly journals Observations of high velocity HI clouds in the Local Group

1978 ◽  
Vol 79 ◽  
pp. 49-49
Author(s):  
W.K. Huchtmeier
Keyword(s):  
Radio Telescope ◽  
High Velocity ◽  
Local Group ◽  
Neutral Hydrogen ◽  
Beam Width ◽  
Late Type ◽  
M 31 ◽  
High Velocity Clouds ◽  
Half Power ◽  
Magellanic Stream

High velocity clouds (HVC) of neutral hydrogen in or around our galaxy and the observations of intergalactic HI in the Local group: Magellanic stream (Mathewson et al., 1974, Astrophys. J. 190, p. 291), M 31 (Davies, R.D., 1975, Mon. Not. R. astr. Soc., 170, p. 45P), and in the Sculptor group of galaxies (Mathewson et al., 1975, Astrophys. J. 195, p. L97) motivated us to search for HVC-phenomena in a number of nearby late-type galaxies with the 100 m Effelsberg radio telescope which has a half power beam width of 8.5′ at the wavelength of 21 cm.

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