Show simple item record Schirmer, M. Diaz, Ruben Joaquin Holhjem, K. Levenson, N. Winge, C. 2016-04-01T22:17:26Z 2013-01
dc.identifier.citation Schirmer, M.; Diaz, Ruben Joaquin; Holhjem, K.; Levenson, N.; Winge, C.; A Sample of Seyfert-2 Galaxies with Ultraluminous Galaxy-wide Narrow-line Regions: Quasar Light Echoes?; IOP Publishing; Astrophysical Journal; 763; 1; 1-2013; 1-19
dc.identifier.issn 0004-637X
dc.description.abstract We report the discovery of Seyfert-2 galaxies in SDSS-DR8 with galaxy-wide, ultraluminous narrow-line regions (NLRs) at redshifts z = 0.2-0.6. With a space density of 4.4 Gpc–3 at z ~ 0.3, these "green beans" (GBs) are amongst the rarest objects in the universe. We are witnessing an exceptional and/or short-lived phenomenon in the life cycle of active galactic nuclei (AGNs). The main focus of this paper is on a detailed analysis of the GB prototype galaxy J2240–0927 (z = 0.326). Its NLR extends over 26 × 44 kpc and is surrounded by an extended NLR. With a total [O III] λ5008 luminosity of (5.7 ± 0.9) × 1043 erg s–1, this is one of the most luminous NLRs known around any type-2 galaxy. Using VLT/XSHOOTER, we show that the NLR is powered by an AGN, and we derive resolved extinction, density, and ionization maps. Gas kinematics is disturbed on a global scale, and high-velocity outflows are absent or faint. This NLR is unlike any other NLR or extended emission line region known. Spectroscopy with Gemini/GMOS reveals extended, high-luminosity [O III] emission also in other GBs. WISE 24 μm luminosities are 5-50 times lower than predicted by the [O III] fluxes, suggesting that the NLRs reflect earlier, very active quasar states that have strongly subsided in less than a galaxy's light-crossing time. These light echoes, or ionization echoes, are about 100 times more luminous than any other such echo known to date. X-ray data are needed for photoionization modeling and to verify the light echoes.
dc.format application/pdf
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights info:eu-repo/semantics/restrictedAccess
dc.subject Active
dc.subject Evolution
dc.subject Seyfert
dc.subject Interstellar medium
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title A Sample of Seyfert-2 Galaxies with Ultraluminous Galaxy-wide Narrow-line Regions: Quasar Light Echoes?
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2016-05-06 15:52:43.262787-03
dc.journal.volume 763
dc.journal.number 1
dc.journal.pagination 1-19
dc.journal.pais Reino Unido
dc.journal.ciudad Londres
dc.description.fil Fil: Schirmer, M.. Gemini Observatory; Chile. Universität Bonn. Argelander-Institut fur Astronomie; Alemania
dc.description.fil Fil: Diaz, Ruben Joaquin. Gemini Observatory; Chile. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
dc.description.fil Fil: Holhjem, K.. Telescopio SOAR; Chile
dc.description.fil Fil: Levenson, N.. Gemini Observatory; Alemania
dc.description.fil Fil: Winge, C.. Gemini Observatory; Alemania
dc.journal.title Astrophysical Journal
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/763/1/60

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