scholarly journals The Hubble Space Telescope Quasar Absorption Line Key Project. VII. Absorption Systems at Z abs <= 1.3

1996 ◽  
Vol 457 ◽  
pp. 19 ◽  
Author(s):  
John N. Bahcall ◽  
Jacqueline Bergeron ◽  
Alec Boksenberg ◽  
George F. Hartig ◽  
Buell T. Jannuzi ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope

The HST Quasar Absorption-Line Key Project. 8: CCD imaging of Hubble Space Telescope quasar fields

1994 ◽  
Vol 106 ◽  
pp. 646 ◽  
Author(s):  
Sofia Kirhakos ◽  
W. L. W. Sargent ◽  
Donald P. Schneider ◽  
John N. Bahcall ◽  
Buell T. Jannuzi ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Ccd Imaging

The Hubble Space Telescope quasar absorption line key project. III - First observational results on Milky Way gas

1993 ◽  
Vol 413 ◽  
pp. 116 ◽  
Author(s):  
Blair D. Savage ◽  
Limin Lu ◽  
John N. Bahcall ◽  
Jacqueline Bergeron ◽  
Alec Boksenberg ◽  
...  
Keyword(s):  
Absorption Line ◽  
Milky Way ◽  
Hubble Space Telescope ◽  
Space Telescope

scholarly journals The contribution of quasar absorption outflows to AGN feedback

2020 ◽  
Vol 499 (1) ◽  
pp. 1522-1529
Author(s):  
Timothy R Miller ◽  
Nahum Arav ◽  
Xinfeng Xu ◽  
Gerard A Kriss
Keyword(s):  
Absorption Line ◽  
Active Galactic Nucleus ◽  
Hubble Space Telescope ◽  
Broad Absorption ◽  
Feedback Effects ◽  
Space Telescope ◽  
Central Source ◽  
Broad Absorption Line

ABSTRACT Determining the distance of quasar absorption outflows from the central source (R) and their kinetic luminosity ($\dot{E}_\mathrm{\scriptstyle k}$) is crucial for understanding their contribution to active galactic nucleus (AGN) feedback. Here, we summarize the results for a sample of nine luminous quasars that were observed with the Hubble Space Telescope. We find that the outflows in more than half of the objects are powerful enough to be the main agents for AGN feedback, and that most outflows are found at R &gt; 100 pc. The sample is representative of the quasar absorption outflow population as a whole and is unbiased towards specific ranges of R and $\dot{E}_\mathrm{\scriptstyle k}$. Therefore, the analysis results can be extended to the majority of such objects, including broad absorption line quasars. We find that these results are consistent with those of another sample (seven quasars) that is also unbiased towards specific ranges of R and $\dot{E}_\mathrm{\scriptstyle k}$. Assuming that all quasars have absorption outflows, we conclude that most luminous quasars produce outflows that can contribute significantly to AGN feedback. We also discuss the criterion for whether an outflow is energetic enough to cause AGN feedback effects.

The Hubble Space Telescope quasar absorption line key project. 6: Properties of the metal-rich systems

1994 ◽  
Vol 436 ◽  
pp. 33 ◽  
Author(s):  
Jacqueline Bergeron ◽  
Patrick Petitjean ◽  
W. L. W. Sargent ◽  
John N. Bahcall ◽  
Alec Boksenberg ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope

The Hubble Space Telescope quasar absorption line key project. II - Data calibration and absorption-line selection

1993 ◽  
Vol 87 ◽  
pp. 45 ◽  
Author(s):  
Donald P. Schneider ◽  
George F. Hartig ◽  
Buell T. Jannuzi ◽  
Sofia Kirhakos ◽  
David H. Saxe ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Line Selection ◽  
Data Calibration

scholarly journals The Evolution of Neutral Gas in the Universe

2006 ◽  
Vol 2 (S235) ◽  
pp. 440-440
Author(s):  
David Turnshek ◽  
Sandhya Rao ◽  
Eric Monier ◽  
Daniel Nestor ◽  
Anna Quider
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Reference List ◽  
Space Telescope ◽  
Neutral Gas ◽  
The Universe ◽  
Initial Results ◽  
Gas Component

AbstractWe give references to some of our work on the properties and evolution of the neutral gas component of the Universe (see reference list). The bulk of the observed neutral gas has been detected by identifying intervening damped Lyα (DLA) quasar absorption-line systems with N(H) ≥2 × 1020 atoms cm−2. We also present some initial results from a program to identify DLA absorbers near redshift z = 0.5 using Hubble Space Telescope ACS prism spectra (see Figure 1).

The Hubble Space Telescope Quasar Absorption Line Key Project. XIII. A Census of Absorption‐Line Systems at Low Redshift

1998 ◽  
Vol 118 (1) ◽  
pp. 1-125 ◽  
Author(s):  
Buell T. Jannuzi ◽  
John N. Bahcall ◽  
Jacqueline Bergeron ◽  
Alec Boksenberg ◽  
George F. Hartig ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Space Telescope

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

Hubble Space Telescope Faint Object Spectrograph and Ground-based Observations of the Broad Absorption Line Quasar 0226-1024: Erratum

1993 ◽  
Vol 413 ◽  
pp. 445 ◽  
Author(s):  
Kirk T. Korista ◽  
Ray J. Weymann ◽  
Simon L. Morris ◽  
Michael, Jr. Kopko ◽  
David A. Turnshek ◽  
...  
Keyword(s):  
Absorption Line ◽  
Hubble Space Telescope ◽  
Broad Absorption ◽  
Space Telescope ◽  
Broad Absorption Line ◽  
Faint Object ◽  
Faint Object Spectrograph
Sign in / Sign up

Export Citation Format

Share Document