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Titolo:
Stellar populations in Seyfert 2 galaxies - I. Atlas of near-UV spectra
Autore:
Joguet, B; Kunth, D; Melnick, J; Terlevich, R; Terlevich, E;
Indirizzi:
Inst Astrophys, F-75014 Paris, France Inst Astrophys Paris France F-75014 nst Astrophys, F-75014 Paris, France European So Observ, Santiago 19, Chile European So Observ Santiago Chile19 opean So Observ, Santiago 19, Chile Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England Univ Cambridge Cambridge England CB3 0HA ron, Cambridge CB3 0HA, England Inst Nacl Astrofis Opt & Elect, Puebla 72000, Mexico Inst Nacl Astrofis Opt & Elect Puebla Mexico 72000 Puebla 72000, Mexico
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 380, anno: 2001,
pagine: 19 - 30
SICI:
1432-0746(200112)380:1<19:SPIS2G>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
BROAD-LINE REGIONS; CATALOG; COMPILATION; VELOCITIES; CONTINUUM; REDSHIFTS; OBJECTS; LIBRARY; INDEXES; SAMPLE;
Keywords:
atlases; galaxies : active; galaxies : Seyfert; galaxies : starburst; galaxies : stellar content;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Joguet, B Inst Astrophys, 98bis Blvd Arago, F-75014 Paris, France Inst Astrophys 98bis Blvd Arago Paris France F-75014 is, France
Citazione:
B. Joguet et al., "Stellar populations in Seyfert 2 galaxies - I. Atlas of near-UV spectra", ASTRON ASTR, 380(1), 2001, pp. 19-30

Abstract

We have carried out a uniform spectroscopic survey of Seyfert 2 galaxies to study the stellar populations of the host galaxies. New spectra have beenobtained for 79 Southern galaxies classified as Seyfert 2 galaxies, 7 normal galaxies, and 73 stars at a resolution of 2.2 Angstrom over the wavelength region 3500-5300 Angstrom. Cross-correlation between the stellar spectrais performed to group the individual observations into 44 synthesis standard spectra. The standard groups include a solar abundance sequence of spectral types from O5 to M3 for dwarfs, giants, and supergiants. Metal-rich andmetal-weak F-K giants and dwarfs are also included. A comparison of the stellar data with previously published spectra is performed both with the individual spectra and the standard groups. For each galaxy, two distinct spatial regions are considered: the nucleus and the external bulge. Spectroscopic variations from one galaxy to another and from the central to the external region are briefly discussed. It is found that the central region of a Seyfert 2 galaxy, after subtracting the bulge stellar population, always shows a near-UV spectrum similar to one of three representative categories: a)many strong emission lines and only two visible absorption lines (Ca II K and G band) (Sey2e); b) few emission lines, many absorption lines, and a redder continuum than the previous category (Sey2a); c) an almost at continuum and high-order Balmer lines seen in absorption (Sey2b). The proportion ofSeyfert 2 galaxies belonging to each class is found to be 22%, 28%, and 50% respectively. We find no significative differences between morphology distributions of Seyfert 2 galaxies with Balmer lines detected in absorption and the rest of the sample. This quick look through the atlas indicates thathalf of Seyfert 2 galaxies harbour a young stellar population (about or less than 100 Myr) in their central region, clearly unveiled by the high order Balmer series seen in absorption.

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Documento generato il 03/04/20 alle ore 20:35:32