HST STIS observations of PG 0946+301: The highest quality UV spectrum of a BALQSO

Nahum Arav, Martijn De Kool, Kirk T. Korista, D. Michael Crenshaw, Wil Van Breugel, Michael Brotherton, Richard F. Green, Max Pettini, Bev Wills, Wim De Vries, Bob Becker, William Nielsen Brandt, Paul Green, Vesa T. Junkkarinen, Anuradha Koratkar, Ari Laor, Sally A. Laurent-Muehleisen, Smita Mathur, Norman Murray

Research output: Contribution to journalArticle

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Abstract

We describe deep (40 orbits) Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of the broad absorption line (BAL) quasi-stellar object (QSO) PG 0946+301 and make them available to the community. These observations are the major part of a multiwavelength campaign on this object aimed at determining the ionization equilibrium and abundances (IEAs) in BALQSOs. We present simple template fits to the entire data set, which yield firm identifications for more than two dozen BALs from 18 ions and give lower limits for the ionic column densities. We find that the outflow's metallicity is consistent with being solar, while the abundance ratio of phosphorus to other metals is at least 10 times solar. These findings are based on diagnostics that are not sensitive to saturation and partial covering effects in the BALs, which considerably weakened previous claims for enhanced metallicity. Ample evidence for these effects is seen in the spectrum. We also discuss several options for extracting tighter IEA constraints in future analyses and present the significant temporal changes that are detected between these spectra and those taken by the HST Faint Object Spectrograph in 1992.

Original languageEnglish (US)
Pages (from-to)118-130
Number of pages13
JournalAstrophysical Journal
Volume561
Issue number1 PART 1
DOIs
StatePublished - Nov 1 2001

Fingerprint

Hubble Space Telescope
spectrographs
metallicity
ionization
faint objects
phosphorus
coverings
outflow
templates
telescopes
saturation
orbits
ion
metal
metals
ions
effect

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Arav, N., De Kool, M., Korista, K. T., Crenshaw, D. M., Van Breugel, W., Brotherton, M., ... Murray, N. (2001). HST STIS observations of PG 0946+301: The highest quality UV spectrum of a BALQSO. Astrophysical Journal, 561(1 PART 1), 118-130. https://doi.org/10.1086/323369
Arav, Nahum ; De Kool, Martijn ; Korista, Kirk T. ; Crenshaw, D. Michael ; Van Breugel, Wil ; Brotherton, Michael ; Green, Richard F. ; Pettini, Max ; Wills, Bev ; De Vries, Wim ; Becker, Bob ; Brandt, William Nielsen ; Green, Paul ; Junkkarinen, Vesa T. ; Koratkar, Anuradha ; Laor, Ari ; Laurent-Muehleisen, Sally A. ; Mathur, Smita ; Murray, Norman. / HST STIS observations of PG 0946+301 : The highest quality UV spectrum of a BALQSO. In: Astrophysical Journal. 2001 ; Vol. 561, No. 1 PART 1. pp. 118-130.
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abstract = "We describe deep (40 orbits) Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of the broad absorption line (BAL) quasi-stellar object (QSO) PG 0946+301 and make them available to the community. These observations are the major part of a multiwavelength campaign on this object aimed at determining the ionization equilibrium and abundances (IEAs) in BALQSOs. We present simple template fits to the entire data set, which yield firm identifications for more than two dozen BALs from 18 ions and give lower limits for the ionic column densities. We find that the outflow's metallicity is consistent with being solar, while the abundance ratio of phosphorus to other metals is at least 10 times solar. These findings are based on diagnostics that are not sensitive to saturation and partial covering effects in the BALs, which considerably weakened previous claims for enhanced metallicity. Ample evidence for these effects is seen in the spectrum. We also discuss several options for extracting tighter IEA constraints in future analyses and present the significant temporal changes that are detected between these spectra and those taken by the HST Faint Object Spectrograph in 1992.",
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Arav, N, De Kool, M, Korista, KT, Crenshaw, DM, Van Breugel, W, Brotherton, M, Green, RF, Pettini, M, Wills, B, De Vries, W, Becker, B, Brandt, WN, Green, P, Junkkarinen, VT, Koratkar, A, Laor, A, Laurent-Muehleisen, SA, Mathur, S & Murray, N 2001, 'HST STIS observations of PG 0946+301: The highest quality UV spectrum of a BALQSO', Astrophysical Journal, vol. 561, no. 1 PART 1, pp. 118-130. https://doi.org/10.1086/323369

HST STIS observations of PG 0946+301 : The highest quality UV spectrum of a BALQSO. / Arav, Nahum; De Kool, Martijn; Korista, Kirk T.; Crenshaw, D. Michael; Van Breugel, Wil; Brotherton, Michael; Green, Richard F.; Pettini, Max; Wills, Bev; De Vries, Wim; Becker, Bob; Brandt, William Nielsen; Green, Paul; Junkkarinen, Vesa T.; Koratkar, Anuradha; Laor, Ari; Laurent-Muehleisen, Sally A.; Mathur, Smita; Murray, Norman.

In: Astrophysical Journal, Vol. 561, No. 1 PART 1, 01.11.2001, p. 118-130.

Research output: Contribution to journalArticle

TY - JOUR

T1 - HST STIS observations of PG 0946+301

T2 - The highest quality UV spectrum of a BALQSO

AU - Arav, Nahum

AU - De Kool, Martijn

AU - Korista, Kirk T.

AU - Crenshaw, D. Michael

AU - Van Breugel, Wil

AU - Brotherton, Michael

AU - Green, Richard F.

AU - Pettini, Max

AU - Wills, Bev

AU - De Vries, Wim

AU - Becker, Bob

AU - Brandt, William Nielsen

AU - Green, Paul

AU - Junkkarinen, Vesa T.

AU - Koratkar, Anuradha

AU - Laor, Ari

AU - Laurent-Muehleisen, Sally A.

AU - Mathur, Smita

AU - Murray, Norman

PY - 2001/11/1

Y1 - 2001/11/1

N2 - We describe deep (40 orbits) Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of the broad absorption line (BAL) quasi-stellar object (QSO) PG 0946+301 and make them available to the community. These observations are the major part of a multiwavelength campaign on this object aimed at determining the ionization equilibrium and abundances (IEAs) in BALQSOs. We present simple template fits to the entire data set, which yield firm identifications for more than two dozen BALs from 18 ions and give lower limits for the ionic column densities. We find that the outflow's metallicity is consistent with being solar, while the abundance ratio of phosphorus to other metals is at least 10 times solar. These findings are based on diagnostics that are not sensitive to saturation and partial covering effects in the BALs, which considerably weakened previous claims for enhanced metallicity. Ample evidence for these effects is seen in the spectrum. We also discuss several options for extracting tighter IEA constraints in future analyses and present the significant temporal changes that are detected between these spectra and those taken by the HST Faint Object Spectrograph in 1992.

AB - We describe deep (40 orbits) Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph observations of the broad absorption line (BAL) quasi-stellar object (QSO) PG 0946+301 and make them available to the community. These observations are the major part of a multiwavelength campaign on this object aimed at determining the ionization equilibrium and abundances (IEAs) in BALQSOs. We present simple template fits to the entire data set, which yield firm identifications for more than two dozen BALs from 18 ions and give lower limits for the ionic column densities. We find that the outflow's metallicity is consistent with being solar, while the abundance ratio of phosphorus to other metals is at least 10 times solar. These findings are based on diagnostics that are not sensitive to saturation and partial covering effects in the BALs, which considerably weakened previous claims for enhanced metallicity. Ample evidence for these effects is seen in the spectrum. We also discuss several options for extracting tighter IEA constraints in future analyses and present the significant temporal changes that are detected between these spectra and those taken by the HST Faint Object Spectrograph in 1992.

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Arav N, De Kool M, Korista KT, Crenshaw DM, Van Breugel W, Brotherton M et al. HST STIS observations of PG 0946+301: The highest quality UV spectrum of a BALQSO. Astrophysical Journal. 2001 Nov 1;561(1 PART 1):118-130. https://doi.org/10.1086/323369