Abstract
We present HST and quasi-simultaneous ground-based observations of the z = 0.3252 QSO PG 2251+113. We find a correlation between line widths and the critical density for de-excitation of the forbidden emission lines observed in this object. We can show that this correlation also applies to the semiforbidden and possibly also the permitted lines which arise in the broad emission-line region. While this result was predicted from statistical studies, it has never previously been shown to hold in detail in any individual object. This relationship between the narrow and broad emission-line regions may help constrain dynamical models of both regions. We examine the implications of this result for a simple radial infall model of the emitting gas developed to explain the origin of narrow-line profiles.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 484-492 |
| Number of pages | 9 |
| Journal | Astrophysical Journal |
| Volume | 434 |
| Issue number | 2 |
| State | Published - Oct 20 1994 |
| Externally published | Yes |
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Keywords
- Quasars: absorption lines
- Ultraviolet: galaxies
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
The HST quasar absorption line key project. IX. An emission-line study of PG 2251+113. / Espey, Brian R.; Turnshek, David A.; Lee, Lincoln; Bergeron, Jacqueline; Boksenberg, Alec; Hartig, George F.; Jannuzi, Buell Tomasson; Sargent, W. L W; Savage, Blair D.; Schneider, Donald P.; Weymann, Ray J.; Wolfe, Arthur M.
In: Astrophysical Journal, Vol. 434, No. 2, 20.10.1994, p. 484-492.Research output: Contribution to journal › Article
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TY - JOUR
T1 - The HST quasar absorption line key project. IX. An emission-line study of PG 2251+113
AU - Espey, Brian R.
AU - Turnshek, David A.
AU - Lee, Lincoln
AU - Bergeron, Jacqueline
AU - Boksenberg, Alec
AU - Hartig, George F.
AU - Jannuzi, Buell Tomasson
AU - Sargent, W. L W
AU - Savage, Blair D.
AU - Schneider, Donald P.
AU - Weymann, Ray J.
AU - Wolfe, Arthur M.
PY - 1994/10/20
Y1 - 1994/10/20
N2 - We present HST and quasi-simultaneous ground-based observations of the z = 0.3252 QSO PG 2251+113. We find a correlation between line widths and the critical density for de-excitation of the forbidden emission lines observed in this object. We can show that this correlation also applies to the semiforbidden and possibly also the permitted lines which arise in the broad emission-line region. While this result was predicted from statistical studies, it has never previously been shown to hold in detail in any individual object. This relationship between the narrow and broad emission-line regions may help constrain dynamical models of both regions. We examine the implications of this result for a simple radial infall model of the emitting gas developed to explain the origin of narrow-line profiles.
AB - We present HST and quasi-simultaneous ground-based observations of the z = 0.3252 QSO PG 2251+113. We find a correlation between line widths and the critical density for de-excitation of the forbidden emission lines observed in this object. We can show that this correlation also applies to the semiforbidden and possibly also the permitted lines which arise in the broad emission-line region. While this result was predicted from statistical studies, it has never previously been shown to hold in detail in any individual object. This relationship between the narrow and broad emission-line regions may help constrain dynamical models of both regions. We examine the implications of this result for a simple radial infall model of the emitting gas developed to explain the origin of narrow-line profiles.
KW - Quasars: absorption lines
KW - Ultraviolet: galaxies
UR - http://www.scopus.com/inward/record.url?scp=12044252755&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=12044252755&partnerID=8YFLogxK
M3 - Article
VL - 434
SP - 484
EP - 492
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
ER -