The HST quasar absorption line key project. IX. An emission-line study of PG 2251+113

Brian R. Espey; David A. Turnshek; Lincoln Lee; Jacqueline Bergeron; Alec Boksenberg; George F. Hartig; Buell T. Jannuzi; W. L.W. Sargent; Blair D. Savage; Donald P. Schneider; Ray J. Weymann; Arthur M. Wolfe

The HST quasar absorption line key project. IX. An emission-line study of PG 2251+113

Brian R. Espey, David A. Turnshek, Lincoln Lee, Jacqueline Bergeron, Alec Boksenberg, George F. Hartig, Buell T. Jannuzi, W. L.W. Sargent, Blair D. Savage, Donald P. Schneider, Ray J. Weymann, Arthur M. Wolfe

Research output: Contribution to journal › Article

13 Scopus citations

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

Keywords

Quasars: absorption lines
Ultraviolet: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Espey, B. R., Turnshek, D. A., Lee, L., Bergeron, J., Boksenberg, A., Hartig, G. F., Jannuzi, B. T., Sargent, W. L. W., Savage, B. D., Schneider, D. P., Weymann, R. J., & Wolfe, A. M. (1994). The HST quasar absorption line key project. IX. An emission-line study of PG 2251+113. Astrophysical Journal, 434(2), 484-492.

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 T.; 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

Espey, Brian R. ; Turnshek, David A. ; Lee, Lincoln ; Bergeron, Jacqueline ; Boksenberg, Alec ; Hartig, George F. ; Jannuzi, Buell T. ; Sargent, W. L.W. ; Savage, Blair D. ; Schneider, Donald P. ; Weymann, Ray J. ; Wolfe, Arthur M. / The HST quasar absorption line key project. IX. An emission-line study of PG 2251+113. In: Astrophysical Journal. 1994 ; Vol. 434, No. 2. pp. 484-492.

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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.",

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AU - Espey, Brian R.

AU - Turnshek, David A.

AU - Lee, Lincoln

AU - Bergeron, Jacqueline

AU - Boksenberg, Alec

AU - Hartig, George F.

AU - Jannuzi, Buell T.

AU - Sargent, W. L.W.

AU - Savage, Blair D.

AU - Schneider, Donald P.

AU - Weymann, Ray J.

AU - Wolfe, Arthur M.

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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.

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KW - Ultraviolet: galaxies

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