A census of quasar-intrinsic absorption in the hubble space telescope archive: Systems from high-resolution echelle spectra

Rajib Ganguly, Ryan S. Lynch, Jane C. Charlton, Michael Eracleous, Todd M. Tripp, Christopher Palma, Kenneth R. Sembach, Toru Misawa, Joseph R. Masiero, Nikola Milutinovic, Benjamin D. Lackey, Therese M. Jones

Research output: Contribution to journalArticle

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Abstract

We present a census of zabs≃2 intrinsic (those showing partial coverage) and associated (zabs ~ zem) quasar absorption-line systems detected in the Hubble Space Telescope archive of Space Telescope Imaging Spectrograph echelle spectra. This work complements the Misawa et al. survey of 2<zem<4 quasars that selects systems using similar techniques.We confirm the existence of so-called strong NV intrinsic systems (where the equivalent width of HI Lyα is small compared to NV λ1238) presented in that work, but find no convincing cases of 'strong C IV' intrinsic systems at low redshift/luminosity. Moreover, we also report on the existence of 'strong OVI' systems. From a comparison of partial coverage results as a function of ion, we conclude that systems selected by the NV ion have the highest probability of being intrinsic. By contrast, the C IV and OVI ions are poor selectors. Of the 30 OVI systems tested, only two of the systems in the spectrum on 3C 351 show convincing evidence for partial coverage. However, there is an ~3s excess in the number of absorbers near the quasar redshift (|δv|≤ 5000 km s-1) over absorbers at large redshift differences. In at least two cases, the associated OVI systems are known not to arise close to the accretion disc of the quasar.

Original languageEnglish (US)
Pages (from-to)1233-1264
Number of pages32
JournalMonthly Notices of the Royal Astronomical Society
Volume435
Issue number2
DOIs
StatePublished - Oct 1 2013

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census
Hubble Space Telescope
quasars
ion
high resolution
absorbers
selectors
ions
accretion
accretion disks
complement
spectrographs
luminosity
telescopes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Ganguly, Rajib ; Lynch, Ryan S. ; Charlton, Jane C. ; Eracleous, Michael ; Tripp, Todd M. ; Palma, Christopher ; Sembach, Kenneth R. ; Misawa, Toru ; Masiero, Joseph R. ; Milutinovic, Nikola ; Lackey, Benjamin D. ; Jones, Therese M. / A census of quasar-intrinsic absorption in the hubble space telescope archive : Systems from high-resolution echelle spectra. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 435, No. 2. pp. 1233-1264.
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abstract = "We present a census of zabs≃2 intrinsic (those showing partial coverage) and associated (zabs ~ zem) quasar absorption-line systems detected in the Hubble Space Telescope archive of Space Telescope Imaging Spectrograph echelle spectra. This work complements the Misawa et al. survey of 2em<4 quasars that selects systems using similar techniques.We confirm the existence of so-called strong NV intrinsic systems (where the equivalent width of HI Lyα is small compared to NV λ1238) presented in that work, but find no convincing cases of 'strong C IV' intrinsic systems at low redshift/luminosity. Moreover, we also report on the existence of 'strong OVI' systems. From a comparison of partial coverage results as a function of ion, we conclude that systems selected by the NV ion have the highest probability of being intrinsic. By contrast, the C IV and OVI ions are poor selectors. Of the 30 OVI systems tested, only two of the systems in the spectrum on 3C 351 show convincing evidence for partial coverage. However, there is an ~3s excess in the number of absorbers near the quasar redshift (|δv|≤ 5000 km s-1) over absorbers at large redshift differences. In at least two cases, the associated OVI systems are known not to arise close to the accretion disc of the quasar.",
author = "Rajib Ganguly and Lynch, {Ryan S.} and Charlton, {Jane C.} and Michael Eracleous and Tripp, {Todd M.} and Christopher Palma and Sembach, {Kenneth R.} and Toru Misawa and Masiero, {Joseph R.} and Nikola Milutinovic and Lackey, {Benjamin D.} and Jones, {Therese M.}",
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Ganguly, R, Lynch, RS, Charlton, JC, Eracleous, M, Tripp, TM, Palma, C, Sembach, KR, Misawa, T, Masiero, JR, Milutinovic, N, Lackey, BD & Jones, TM 2013, 'A census of quasar-intrinsic absorption in the hubble space telescope archive: Systems from high-resolution echelle spectra', Monthly Notices of the Royal Astronomical Society, vol. 435, no. 2, pp. 1233-1264. https://doi.org/10.1093/mnras/stt1366

A census of quasar-intrinsic absorption in the hubble space telescope archive : Systems from high-resolution echelle spectra. / Ganguly, Rajib; Lynch, Ryan S.; Charlton, Jane C.; Eracleous, Michael; Tripp, Todd M.; Palma, Christopher; Sembach, Kenneth R.; Misawa, Toru; Masiero, Joseph R.; Milutinovic, Nikola; Lackey, Benjamin D.; Jones, Therese M.

In: Monthly Notices of the Royal Astronomical Society, Vol. 435, No. 2, 01.10.2013, p. 1233-1264.

Research output: Contribution to journalArticle

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T1 - A census of quasar-intrinsic absorption in the hubble space telescope archive

T2 - Systems from high-resolution echelle spectra

AU - Ganguly, Rajib

AU - Lynch, Ryan S.

AU - Charlton, Jane C.

AU - Eracleous, Michael

AU - Tripp, Todd M.

AU - Palma, Christopher

AU - Sembach, Kenneth R.

AU - Misawa, Toru

AU - Masiero, Joseph R.

AU - Milutinovic, Nikola

AU - Lackey, Benjamin D.

AU - Jones, Therese M.

PY - 2013/10/1

Y1 - 2013/10/1

N2 - We present a census of zabs≃2 intrinsic (those showing partial coverage) and associated (zabs ~ zem) quasar absorption-line systems detected in the Hubble Space Telescope archive of Space Telescope Imaging Spectrograph echelle spectra. This work complements the Misawa et al. survey of 2em<4 quasars that selects systems using similar techniques.We confirm the existence of so-called strong NV intrinsic systems (where the equivalent width of HI Lyα is small compared to NV λ1238) presented in that work, but find no convincing cases of 'strong C IV' intrinsic systems at low redshift/luminosity. Moreover, we also report on the existence of 'strong OVI' systems. From a comparison of partial coverage results as a function of ion, we conclude that systems selected by the NV ion have the highest probability of being intrinsic. By contrast, the C IV and OVI ions are poor selectors. Of the 30 OVI systems tested, only two of the systems in the spectrum on 3C 351 show convincing evidence for partial coverage. However, there is an ~3s excess in the number of absorbers near the quasar redshift (|δv|≤ 5000 km s-1) over absorbers at large redshift differences. In at least two cases, the associated OVI systems are known not to arise close to the accretion disc of the quasar.

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