Observation of the Lyman Alpha Interstellar Absorption Line in Theta Orionis

1969 ◽  
Vol 156 ◽  
pp. L97 ◽  
Author(s):  
George R. Carruthers
Keyword(s):  
Absorption Line ◽  
Interstellar Absorption ◽  
Lyman Alpha

scholarly journals Distance Determinations from 21 cm Interstellar Absorption-line Measurements

1983 ◽  
Vol 103 ◽  
pp. 541-542 ◽  
Author(s):  
S.R. Pottasch ◽  
R. Gathier ◽  
W.M. Goss
Keyword(s):  
Absorption Line ◽  
Radio Telescope ◽  
Galactic Plane ◽  
Planetary Nebulae ◽  
Interstellar Absorption

HI observations at 21 cm have been made with the Westerbork Synthesis Radio Telescope in the direction of six planetary nebulae located in or near the galactic plane (N 7027, 2440, 6537, 6572, 7026, 7354).

Abundances fromz=0 toz=5

2002 ◽  
Vol 187 ◽  
pp. 109-115
Author(s):  
Donald G. York
Keyword(s):  
Absorption Line ◽  
Milky Way ◽  
Magellanic Clouds ◽  
Type I ◽  
Lyman Alpha ◽  
Damped Lyman Alpha Systems ◽  
The Universe ◽  
Milky Way Halo

Interstellar abundances are compared for the Milky Way disk, the Milky Way halo, the Large and Small Magellanic Clouds and the damped Lyman alpha systems among the QSO absorption line systems. While a new set of observational aspects of element formation in the Universe is emerging, including a dearth of formation activity fromz=5 toz=3, the predicted signal of [Si/Fe] decreasing from highzto lowz, as Type I supernovae start contributing to Fe production, has not yet been seen.

scholarly journals Simulations of the Intergalactic Medium

2005 ◽  
Vol 216 ◽  
pp. 251-265
Author(s):  
Romeel Davé
Keyword(s):  
Absorption Line ◽  
Galaxy Formation ◽  
Intergalactic Medium ◽  
Ultraviolet Absorption ◽  
Multiple Populations ◽  
Hydrodynamic Simulations ◽  
Lyman Alpha ◽  
Lyman Alpha Forest ◽  
Working Together

I present an epochal review of baryons in the intergalactic medium (IGM), from the reionization epoch until today. Recent observations indicate a protracted period of reionization, suggesting multiple populations of reionizers; detection of these z ≳ 6 sources is a key goal that is now coming within reach. The optical Lyman alpha forest (2 ≲ z ≲ 4) is well-described by the Fluctuating Gunn-Peterson Approximation, but recent observations of galaxies and metal lines associated with Lyα absorbers remain puzzling. IGM studies at z ≲ 1.5 are progressing rapidly thanks to ultraviolet absorption line studies of both Lyα absorbers and the warm-hot intergalactic medium. Cosmological hydrodynamic simulations have played an integral part in these advances, and have helped to revolutionize our understanding of the IGM at various epochs. Working together, observations and theory continue to expand our knowledge of the IGM as the earliest stage of galaxy formation and the dominant reservoir of baryons at all redshifts.

The Hubble Space Telescope quasar absorption line key project. I - First observational results, including Lyman-alpha and Lyman-limit systems

1993 ◽  
Vol 87 ◽  
pp. 1 ◽  
Author(s):  
John N. Bahcall ◽  
Jacqueline Bergeron ◽  
Alec Boksenberg ◽  
George F. Hartig ◽  
Buell T. Jannuzi ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Lyman Alpha

The interstellar absorption-line spectrum of MU Ophiuchi

1982 ◽  
Vol 262 ◽  
pp. 213 ◽  
Author(s):  
J. Cardelli ◽  
E. Boehm-Vitense
Keyword(s):  
Absorption Line ◽  
Line Spectrum ◽  
Interstellar Absorption
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