scholarly journals Intrinsic Absorption Lines in Seyfert 1 Galaxies. I. Ultraviolet Spectra from theHubble Space Telescope

1999 ◽  
Vol 516 (2) ◽  
pp. 750-768 ◽  
Author(s):  
D. Michael Crenshaw ◽  
Steven B. Kraemer ◽  
Albert Boggess ◽  
Stephen P. Maran ◽  
Richard F. Mushotzky ◽  
...  
Keyword(s):  
Absorption Lines ◽  
Space Telescope ◽  
Ultraviolet Spectra ◽  
Intrinsic Absorption

High‐Resolution X‐Ray and Ultraviolet Spectroscopy of the Complex Intrinsic Absorption in NGC 4051 withChandraand theHubble Space Telescope

2001 ◽  
Vol 557 (1) ◽  
pp. 2-17 ◽  
Author(s):  
M. J. Collinge ◽  
W. N. Brandt ◽  
Shai Kaspi ◽  
D. Michael Crenshaw ◽  
Martin Elvis ◽  
...  
Keyword(s):  
High Resolution ◽  
Ultraviolet Spectroscopy ◽  
Space Telescope ◽  
X Ray ◽  
Intrinsic Absorption ◽  
Ngc 4051

scholarly journals Gas in cosmic voids

1986 ◽  
Vol 119 ◽  
pp. 575-576
Author(s):  
P M Gondhalekar ◽  
N Brosch
Keyword(s):  
Absorption Lines ◽  
Chemical Enrichment ◽  
Ultraviolet Spectra ◽  
Cosmic Voids

Absorption lines at the redshifts of cosmic voids in Perseus-Pisces and Böotes have been detected in the ultraviolet spectra of background quasars. The detection of Si IV and C IV lines besides Ly α suggests chemical enrichment of gas in the voids. Additional observations of three sight-lines through the void in the Böotes suggests that the gas in the void is clumped in large clouds.

scholarly journals MONITORING THE VARIABILITY OF INTRINSIC ABSORPTION LINES IN QUASAR SPECTRA, ,

2014 ◽  
Vol 792 (1) ◽  
pp. 77 ◽  
Author(s):  
Toru Misawa ◽  
Jane C. Charlton ◽  
Michael Eracleous
Keyword(s):  
Absorption Lines ◽  
Intrinsic Absorption ◽  
Quasar Spectra

scholarly journals Variability Tests for Intrinsic Absorption Lines in Quasar Spectra

2004 ◽  
Vol 601 (2) ◽  
pp. 715-722 ◽  
Author(s):  
Desika Narayanan ◽  
Fred Hamann ◽  
Tom Barlow ◽  
E. M. Burbidge ◽  
Ross D. Cohen ◽  
...  
Keyword(s):  
Absorption Lines ◽  
Intrinsic Absorption ◽  
Quasar Spectra

scholarly journals A census of quasar-intrinsic absorption in the Hubble Space Telescope archive: systems from high-resolution echelle spectra★

2013 ◽  
Vol 435 (2) ◽  
pp. 1233-1264 ◽  
Author(s):  
Rajib Ganguly ◽  
Ryan S. Lynch ◽  
Jane C. Charlton ◽  
Michael Eracleous ◽  
Todd M. Tripp ◽  
...  
Keyword(s):  
High Resolution ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Intrinsic Absorption

High‐Resolution Spectra of Intrinsic Absorption Lines in the Quasi‐stellar Object UM 675

1997 ◽  
Vol 478 (1) ◽  
pp. 80-86 ◽  
Author(s):  
Fred Hamann ◽  
Thomas A. Barlow ◽  
Vesa Junkkarinen ◽  
E. M. Burbidge
Keyword(s):  
High Resolution ◽  
Stellar Object ◽  
Absorption Lines ◽  
Intrinsic Absorption

scholarly journals Intrinsic Absorption and Emission Lines in Seyfert Galaxies

1997 ◽  
Vol 159 ◽  
pp. 240-243 ◽  
Author(s):  
D.M. Crenshaw
Keyword(s):  
Large Fraction ◽  
Seyfert Galaxies ◽  
Absorption Lines ◽  
Line Of Sight ◽  
Host Galaxy ◽  
Mass Motion ◽  
Active Nucleus ◽  
X Ray ◽  
Intrinsic Absorption ◽  
Uv Absorbers

AbstractRecentHSTspectra indicate that a large fraction of Seyfert 1 galaxies have UV absorption lines that are intrinsic to the active nucleus or its environment.IUEmonitoring or multipleHSTobservations of several sources show that many absorption lines are variable, either as a result of mass motion across the line-of-sight or of changing ionization within the gas in response to variations in the ionizing continuum. The UV absorbers may be related to the warm absorbers seen in the X-ray spectra of many Seyfert galaxies, but a direct connection between the two has not been made. Some of the absorption lines may arise in the emission-line regions in the nucleus or host galaxy, providing valuable clues to their nature.

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