A study of ultraviolet absorption lines through the complete Galactic halo by the analysis of HST faint object spectrograph spectra of active Galactic nuclei, 1

1994 ◽  
Vol 437 ◽  
pp. 630 ◽  
Author(s):  
Geoffrey S. Burks ◽  
Frank Bartko ◽  
J. Michael Shull ◽  
John T. Stocke ◽  
Elise R. Sachs ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Halo ◽  
Galactic Nuclei ◽  
Ultraviolet Absorption ◽  
Absorption Lines ◽  
Faint Object ◽  
Faint Object Spectrograph

Emission Line Properties of Active Galactic Nuclei from a Post‐COSTAR Hubble Space Telescope Faint Object Spectrograph Spectral Atlas

2004 ◽  
Vol 150 (1) ◽  
pp. 165-180 ◽  
Author(s):  
Joanna K. Kuraszkiewicz ◽  
Paul J. Green ◽  
D. Michael Crenshaw ◽  
Jay Dunn ◽  
Karl Forster ◽  
...  
Keyword(s):  
Emission Line ◽  
Active Galactic Nuclei ◽  
Hubble Space Telescope ◽  
Galactic Nuclei ◽  
Space Telescope ◽  
Faint Object ◽  
Faint Object Spectrograph

Emission Line Properties of Active Galactic Nuclei from a Pre‐COSTAR Faint Object Spectrograph Hubble Space Telescope Spectral Atlas

2002 ◽  
Vol 143 (2) ◽  
pp. 257-276 ◽  
Author(s):  
Joanna K. Kuraszkiewicz ◽  
Paul J. Green ◽  
Karl Forster ◽  
Thomas L. Aldcroft ◽  
Ian N. Evans ◽  
...  
Keyword(s):  
Emission Line ◽  
Active Galactic Nuclei ◽  
Hubble Space Telescope ◽  
Galactic Nuclei ◽  
Space Telescope ◽  
Faint Object ◽  
Faint Object Spectrograph

scholarly journals HST FOS Observations of KPD0005+5106: A Subluminous WN-WC Descendant by Ongoing Mass Outflow?

1993 ◽  
Vol 155 ◽  
pp. 498-498
Author(s):  
Edward M. Sion ◽  
Ronald A. Downes
Keyword(s):  
Hubble Space Telescope ◽  
Absorption Lines ◽  
High Excitation ◽  
Strong Emission ◽  
Present Evidence ◽  
High Ionization ◽  
Faint Object ◽  
Mass Outflow ◽  
Line Widths ◽  
Faint Object Spectrograph

We report the results of spectroscopic observations of the ultra-high excitation, helium-rich, pre-white dwarf KPD0005+5106 obtained with the Hubble Space Telescope Faint Object Spectrograph (FOS) in 1991 May and July with the red (FOS/RD) and blue (FOS/BL) Digicon detectors. The data reveal a rich line spectrum both in absorption and in emission with ultra-high excitation species present including O VIII, N V, possibly C V, Fe VI, Fe VII and numerous weaker high n, low l, transitions of C IV and O VI as well as the predominant He II (3 → n) and He II (Balmer α) absorption lines. There is a strong emission complex at 2981A which we identify primarily as three transitions of N V commonly seen in WN Wolf-Rayet spectra. We present evidence that high ionization species in emission (O VIII, N V, C IV, Si IV) and in absorption (He II, Fe VI, Fe VII) are longward-shifted relative to the far UV resonance (circumstellar) absorption lines by 25–50 km/s. Based upon the detected species, line velocities, line widths and emission features, we conclude that (1) KPD0005 is the very likely the evolutionary descendant of a WN-WC subluminous Wolf-Rayet progenitor and (2) has ongoing, possibly episodic, mass outflow.

scholarly journals HI in Active Galactic Nuclei

2002 ◽  
Vol 199 ◽  
pp. 129-130
Author(s):  
Z. Yu ◽  
D. Jiang
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Strong Absorption ◽  
Absorption Lines ◽  
Absorption Features

Recent VLBA and VLA observations indicate the possibility of a circumnuclear disc or torus of HI in detected in absorption in NGC 3894. Strong absorption lines are detected toward both the aproaching and receding jets. Absorption profiles integrated over six regions across the source are shown. At lease two velocity components are present in all lines of sight except toward the southeast. The parameters are obtained from these fits(Peck and Taylor,1998,Ap.J.,502,L23). We use the bending model to explain the four prominent absorption features.

Faint Object Spectrograph Spectra of the Broad Fe II Absorption Lines in the Remnant of SN 1006

1993 ◽  
Vol 416 ◽  
pp. 247 ◽  
Author(s):  
Chi-Chao Wu ◽  
D. Michael Crenshaw ◽  
Robert A. Fesen ◽  
Andrew J. S. Hamilton ◽  
Craig L. Sarazin
Keyword(s):  
Absorption Lines ◽  
Faint Object ◽  
Faint Object Spectrograph

scholarly journals X-ray/UV campaign on the Mrk 279 outflow: Density diagnostics in Active Galactic Nuclei using O v K-shell absorption lines

2004 ◽  
Vol 428 (1) ◽  
pp. 57-66 ◽  
Author(s):  
J. S. Kaastra ◽  
A. J. J. Raassen ◽  
R. Mewe ◽  
N. Arav ◽  
E. Behar ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Absorption Lines ◽  
X Ray ◽  
Density Diagnostics
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