A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey

Patrick B. Hall, Erik A. Hoversten, Christy A. Tremonti, Daniel E. Vanden Berk, Donald P. Schneider, Michael A. Strauss, Gillian R. Knapp, Donald G. York, Damien Hutemékers, P. R. Newman, J. Brinkmann, Brenda Frye, Masataka Fukugita, Karl Glazebrook, Michael Harvanek, Timothy M. Heckman, Željko Ivezić, S. Kleinman, Jurek Krzesinski, Daniel C. Long & 5 others Eric Neilsen, Martin Niederste-Ostholt, Atsuko Nitta, David J. Schlegel, S. Snedden

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The Sloan Digital Sky Survey has discovered a z = 2.4917 radio-loud active galactic nucleus (AGN) with a luminous, variable, low-polarization UV continuum, H I two-photon emission, and a moderately broad Lyα line (FWHM ≃ 1430 km s-1) but without obvious metal-line emission. SDSS J113658.36+024220.1 does have associated metal-line absorption in three distinct, narrow systems spanning a velocity range of 2710 km s-1. Despite certain spectral similarities, SDSS J1136+0242 is not a Lyman break galaxy. Instead, the Lyα and two-photon emission can be attributed to an extended, low-metallicity narrow-line region. The unpolarized continuum argues that we see SDSS 11136+0242 very close to the axis of any ionization cone present. We can conceive of two plausible explanations for why we see a strong UV continuum but no broad-line emission in this "face-on radio galaxy" model for SDSS J1136+0242: the continuum could be relativistically beamed synchrotron emission that swamps the broad-line emission, or more likely, SDSS J1136+0242 could be similar to PG1407+265, a quasar in which for some unknown reason the high-ionization emission lines are very broad, very weak, and highly blueshifted.

Original languageEnglish (US)
Pages (from-to)3146-3154
Number of pages9
JournalAstronomical Journal
Volume127
Issue number6 1782
DOIs
StatePublished - Jun 1 2004

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active galactic nuclei
continuums
ionization
radio
marshlands
metal
radio galaxies
photons
swamp
metals
quasars
metallicity
cones
synchrotrons
polarization
galaxies

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hall, P. B., Hoversten, E. A., Tremonti, C. A., Vanden Berk, D. E., Schneider, D. P., Strauss, M. A., ... Snedden, S. (2004). A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey. Astronomical Journal, 127(6 1782), 3146-3154. https://doi.org/10.1086/420804
Hall, Patrick B. ; Hoversten, Erik A. ; Tremonti, Christy A. ; Vanden Berk, Daniel E. ; Schneider, Donald P. ; Strauss, Michael A. ; Knapp, Gillian R. ; York, Donald G. ; Hutemékers, Damien ; Newman, P. R. ; Brinkmann, J. ; Frye, Brenda ; Fukugita, Masataka ; Glazebrook, Karl ; Harvanek, Michael ; Heckman, Timothy M. ; Ivezić, Željko ; Kleinman, S. ; Krzesinski, Jurek ; Long, Daniel C. ; Neilsen, Eric ; Niederste-Ostholt, Martin ; Nitta, Atsuko ; Schlegel, David J. ; Snedden, S. / A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey. In: Astronomical Journal. 2004 ; Vol. 127, No. 6 1782. pp. 3146-3154.
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abstract = "The Sloan Digital Sky Survey has discovered a z = 2.4917 radio-loud active galactic nucleus (AGN) with a luminous, variable, low-polarization UV continuum, H I two-photon emission, and a moderately broad Lyα line (FWHM ≃ 1430 km s-1) but without obvious metal-line emission. SDSS J113658.36+024220.1 does have associated metal-line absorption in three distinct, narrow systems spanning a velocity range of 2710 km s-1. Despite certain spectral similarities, SDSS J1136+0242 is not a Lyman break galaxy. Instead, the Lyα and two-photon emission can be attributed to an extended, low-metallicity narrow-line region. The unpolarized continuum argues that we see SDSS 11136+0242 very close to the axis of any ionization cone present. We can conceive of two plausible explanations for why we see a strong UV continuum but no broad-line emission in this {"}face-on radio galaxy{"} model for SDSS J1136+0242: the continuum could be relativistically beamed synchrotron emission that swamps the broad-line emission, or more likely, SDSS J1136+0242 could be similar to PG1407+265, a quasar in which for some unknown reason the high-ionization emission lines are very broad, very weak, and highly blueshifted.",
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Hall, PB, Hoversten, EA, Tremonti, CA, Vanden Berk, DE, Schneider, DP, Strauss, MA, Knapp, GR, York, DG, Hutemékers, D, Newman, PR, Brinkmann, J, Frye, B, Fukugita, M, Glazebrook, K, Harvanek, M, Heckman, TM, Ivezić, Ž, Kleinman, S, Krzesinski, J, Long, DC, Neilsen, E, Niederste-Ostholt, M, Nitta, A, Schlegel, DJ & Snedden, S 2004, 'A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey', Astronomical Journal, vol. 127, no. 6 1782, pp. 3146-3154. https://doi.org/10.1086/420804

A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey. / Hall, Patrick B.; Hoversten, Erik A.; Tremonti, Christy A.; Vanden Berk, Daniel E.; Schneider, Donald P.; Strauss, Michael A.; Knapp, Gillian R.; York, Donald G.; Hutemékers, Damien; Newman, P. R.; Brinkmann, J.; Frye, Brenda; Fukugita, Masataka; Glazebrook, Karl; Harvanek, Michael; Heckman, Timothy M.; Ivezić, Željko; Kleinman, S.; Krzesinski, Jurek; Long, Daniel C.; Neilsen, Eric; Niederste-Ostholt, Martin; Nitta, Atsuko; Schlegel, David J.; Snedden, S.

In: Astronomical Journal, Vol. 127, No. 6 1782, 01.06.2004, p. 3146-3154.

Research output: Contribution to journalArticle

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T1 - A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey

AU - Hall, Patrick B.

AU - Hoversten, Erik A.

AU - Tremonti, Christy A.

AU - Vanden Berk, Daniel E.

AU - Schneider, Donald P.

AU - Strauss, Michael A.

AU - Knapp, Gillian R.

AU - York, Donald G.

AU - Hutemékers, Damien

AU - Newman, P. R.

AU - Brinkmann, J.

AU - Frye, Brenda

AU - Fukugita, Masataka

AU - Glazebrook, Karl

AU - Harvanek, Michael

AU - Heckman, Timothy M.

AU - Ivezić, Željko

AU - Kleinman, S.

AU - Krzesinski, Jurek

AU - Long, Daniel C.

AU - Neilsen, Eric

AU - Niederste-Ostholt, Martin

AU - Nitta, Atsuko

AU - Schlegel, David J.

AU - Snedden, S.

PY - 2004/6/1

Y1 - 2004/6/1

N2 - The Sloan Digital Sky Survey has discovered a z = 2.4917 radio-loud active galactic nucleus (AGN) with a luminous, variable, low-polarization UV continuum, H I two-photon emission, and a moderately broad Lyα line (FWHM ≃ 1430 km s-1) but without obvious metal-line emission. SDSS J113658.36+024220.1 does have associated metal-line absorption in three distinct, narrow systems spanning a velocity range of 2710 km s-1. Despite certain spectral similarities, SDSS J1136+0242 is not a Lyman break galaxy. Instead, the Lyα and two-photon emission can be attributed to an extended, low-metallicity narrow-line region. The unpolarized continuum argues that we see SDSS 11136+0242 very close to the axis of any ionization cone present. We can conceive of two plausible explanations for why we see a strong UV continuum but no broad-line emission in this "face-on radio galaxy" model for SDSS J1136+0242: the continuum could be relativistically beamed synchrotron emission that swamps the broad-line emission, or more likely, SDSS J1136+0242 could be similar to PG1407+265, a quasar in which for some unknown reason the high-ionization emission lines are very broad, very weak, and highly blueshifted.

AB - The Sloan Digital Sky Survey has discovered a z = 2.4917 radio-loud active galactic nucleus (AGN) with a luminous, variable, low-polarization UV continuum, H I two-photon emission, and a moderately broad Lyα line (FWHM ≃ 1430 km s-1) but without obvious metal-line emission. SDSS J113658.36+024220.1 does have associated metal-line absorption in three distinct, narrow systems spanning a velocity range of 2710 km s-1. Despite certain spectral similarities, SDSS J1136+0242 is not a Lyman break galaxy. Instead, the Lyα and two-photon emission can be attributed to an extended, low-metallicity narrow-line region. The unpolarized continuum argues that we see SDSS 11136+0242 very close to the axis of any ionization cone present. We can conceive of two plausible explanations for why we see a strong UV continuum but no broad-line emission in this "face-on radio galaxy" model for SDSS J1136+0242: the continuum could be relativistically beamed synchrotron emission that swamps the broad-line emission, or more likely, SDSS J1136+0242 could be similar to PG1407+265, a quasar in which for some unknown reason the high-ionization emission lines are very broad, very weak, and highly blueshifted.

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DO - 10.1086/420804

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Hall PB, Hoversten EA, Tremonti CA, Vanden Berk DE, Schneider DP, Strauss MA et al. A Lyα-only active galactic nucleus from the Sloan Digital Sky Survey. Astronomical Journal. 2004 Jun 1;127(6 1782):3146-3154. https://doi.org/10.1086/420804