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

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dc.contributor.authorHall, PB
dc.contributor.authorHoversten, EA
dc.contributor.authorTremonti, CA
dc.contributor.authorVanden Berk, DE
dc.contributor.authorSchneider, DP
dc.contributor.authorStrauss, MA
dc.contributor.authorKnapp, GR
dc.contributor.authorYork, DG
dc.contributor.authorHutsemékers, D
dc.contributor.authorNewman, PR
dc.contributor.authorBrinkmann, J
dc.contributor.authorFrye, B
dc.contributor.authorFukugita, M
dc.contributor.authorGlazebrook, K
dc.contributor.authorHarvanek, M
dc.contributor.authorHeckman, TM
dc.contributor.authorIvezic, Z
dc.contributor.authorKleinman, S
dc.contributor.authorKrzesinski, J
dc.contributor.authorLong, DC
dc.contributor.authorNeilsen, E
dc.contributor.authorNiederste-Ostholt, M
dc.contributor.authorNitta, A
dc.contributor.authorSchlegel, DJ
dc.contributor.authorSnedden, S
dc.date.accessioned2025-01-21T01:07:58Z
dc.date.available2025-01-21T01:07:58Z
dc.date.issued2004
dc.description.abstractThe 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 Lyalpha line (FWHM similar or equal to 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 Lyalpha and two-photon emission can be attributed to an extended, low-metallicity narrow-line region. The unpolarized continuum argues that we see SDSS J1136+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 PG 1407+265, a quasar in which for some unknown reason the high-ionization emission lines are very broad, very weak, and highly blueshifted.
dc.fuente.origenWOS
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96407
dc.identifier.wosidWOS:000222002600007
dc.issue.numero6
dc.language.isoen
dc.pagina.final3154
dc.pagina.inicio3146
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.subjectquasars : emission lines
dc.subjectquasars : general
dc.subjectquasars : individual ( PG 1407+265, SDSS J113658.36+024220.1)
dc.titleA Lyα-only active galactic nucleus from the Sloan Digital Sky Survey
dc.typeartículo
dc.volumen127
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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