scholarly journals Optical and Ultraviolet Absorption Studies of Cool Gas in the Milky Way Halo

1991 ◽  
Vol 144 ◽  
pp. 53-66
Author(s):  
L. Danly
Keyword(s):  
Interstellar Medium ◽  
Milky Way ◽  
Ultraviolet Absorption ◽  
Trade Offs ◽  
Absorption Studies ◽  
Cool Gas ◽  
The Many ◽  
Halo Gas ◽  
Milky Way Halo

Of the many and various means for observing the interstellar medium, and halo gas in particular, optical and ultraviolet absorption techniques provide both unique opportunities and unique limitations. As its title indicates, this article speaks specifically to the contributions from absorption methods to our knowledge of halo gas with temperatures below 105 K. A brief description of the trade-offs and benefits of the methods is therefore useful to set the stage for interpreting the observations of halo gas.

A high-resolution optical and radio study of Milky Way halo gas

1993 ◽  
Vol 88 ◽  
pp. 81 ◽  
Author(s):  
C. E. Albert ◽  
J. C. Blades ◽  
D. C. Morton ◽  
Felix J. Lockman ◽  
M. Proulx ◽  
...  
Keyword(s):  
High Resolution ◽  
Milky Way ◽  
Halo Gas ◽  
Milky Way Halo

Ultraviolet Observations of Halo Clouds

1989 ◽  
Vol 120 ◽  
pp. 408-415 ◽  
Author(s):  
Laura Danly ◽  
Chris Blades
Keyword(s):  
Optical Absorption ◽  
Milky Way ◽  
Galactic Plane ◽  
Galactic Rotation ◽  
Considerable Effort ◽  
Refractory Elements ◽  
Early Results ◽  
Absorption Studies ◽  
Ultraviolet Observations ◽  
Halo Gas

Since the earliest optical absorption line studies of Munch and Zirin (1961) identified clouds of gas located at large distances from the galactic plane, considerable effort has gone into trying to understand the origin and nature of Milky Way halo gas. Subsequent high resolution optical absorption studies (Albert 1981; Blades et al 1989) have expanded on the early results, demonstrating clearly that (1) halo clouds are more likely to have velocities outside the range allowed by galactic rotation and (2) halo clouds show smaller depletion of refractory elements compared to their disk counterparts (i.e. the Spitzer-Routley effect).

scholarly journals The Cool Atomic Gas in the Large Magellanic Cloud

1999 ◽  
Vol 190 ◽  
pp. 112-113
Author(s):  
M. Marx-Zimmer ◽  
F. Zimmer ◽  
U. Herbstmeier ◽  
J. M. Dickey ◽  
L. Staveley-Smith
Keyword(s):  
Interstellar Medium ◽  
Absorption Line ◽  
Milky Way ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Raw Material ◽  
Line Survey ◽  
Cool Gas ◽  
Compact Array ◽  
Atomic Phase

Studying the cool atomic phase of the interstellar medium is of special significance as cool atomic clouds can become the raw material for star formation and so determine the evolution of the whole galaxy. The cool atomic interstellar medium of the Large Magellanic Cloud (LMC) seems to be quite different from that in the Milky Way. In three 21 cm absorption line surveys using the Australia Telescope Compact Array (ATCA) the physical properties of the cool atomic hydrogen in the LMC and the halo of the Magellanic Clouds have been studied. Here we present the results of the third HI absorption line survey. A detailed investigation of the cool HI has been done toward the supergiant shell LMC4, the surroundings of 30 Doradus and in the direction of the eastern steep HI boundary. The data have been compared with survey 2 (Dickey et al. 1994) to probe the cool gas fraction for these different regions of the LMC and to study the differences of the cool atomic phase of the LMC and that of the Milky Way.

Ultraviolet and radio observations of Milky Way halo gas

1992 ◽  
Vol 81 ◽  
pp. 125 ◽  
Author(s):  
Laura Danly ◽  
Felix J. Lockman ◽  
Marilyn R. Meade ◽  
Blair D. Savage
Keyword(s):  
Milky Way ◽  
Radio Observations ◽  
Halo Gas ◽  
Milky Way Halo

3He in the Milky Way Interstellar Medium: Abundance Determinations

1999 ◽  
Vol 510 (2) ◽  
pp. 759-783 ◽  
Author(s):  
Dana S. Balser ◽  
T. M. Bania ◽  
Robert T. Rood ◽  
T. L. Wilson
Keyword(s):  
Interstellar Medium ◽  
Milky Way

scholarly journals FOLLOWING THE COSMIC EVOLUTION OF PRISTINE GAS. I. IMPLICATIONS FOR MILKY WAY HALO STARS

2016 ◽  
Vol 834 (1) ◽  
pp. 23 ◽  
Author(s):  
Richard Sarmento ◽  
Evan Scannapieco ◽  
Liubin Pan
Keyword(s):  
Milky Way ◽  
Halo Stars ◽  
Cosmic Evolution ◽  
Milky Way Halo

Evidence of a Dwarf Galaxy Stream Populating the Inner Milky Way Halo

2021 ◽  
Vol 920 (1) ◽  
pp. 51
Author(s):  
Khyati Malhan ◽  
Zhen Yuan ◽  
Rodrigo A. Ibata ◽  
Anke Arentsen ◽  
Michele Bellazzini ◽  
...  
Keyword(s):  
Milky Way ◽  
Dwarf Galaxy ◽  
Milky Way Halo

scholarly journals Are there MACHOs in the Milky Way halo?

2002 ◽  
Vol 395 (1) ◽  
pp. 31-35 ◽  
Author(s):  
A. M. Green ◽  
K. Jedamzik
Keyword(s):  
Milky Way ◽  
Milky Way Halo
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