Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227
Main Author: | |
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Publication Date: | 1995 |
Other Authors: | , , , , |
Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UFRGS |
Download full: | http://hdl.handle.net/10183/108845 |
Summary: | The results of a five-month monitoring campaign on the Seyfert 1.5 galaxy NGC 3227 are presented. Variability was detected in the continuum and in the broad emission lines. Cross correlations of the 4200 Å continuum light curve with the Hβ and He II λ4686 emission-line light curves indicate delays of 18 ± 5 and 16 ± 2 days, respectively, between the continuum variations and the response of the lines. We apply a maximum entropy method to solve for the transfer function that relates the Hβ and He II λ4686 lines and 4200 Å continuum variability and the result of this analysis suggests that there is a deficit of emission-line response due to gas along the line of sight to the continuum source for both lines. Using a composite off-nuclear spectrum, we synthesize the bulge stellar population, which is found to be mainly old (77% with age > 10 Gyr) with a metallicity twice the solar value. The synthesis also yields an internal color excess E(B−V) ≈0.04. The mean contribution of the stellar population to the inner 5" x 10" spectra during the campaign was ~40% . |
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Winge, ClaudiaPeterson, Bradley M.Horne, KeithPogge, Richard WilliamPastoriza, Miriani GriseldaStorchi-Bergmann, Thaisa2015-01-08T02:13:10Z19950004-637Xhttp://hdl.handle.net/10183/108845000262671The results of a five-month monitoring campaign on the Seyfert 1.5 galaxy NGC 3227 are presented. Variability was detected in the continuum and in the broad emission lines. Cross correlations of the 4200 Å continuum light curve with the Hβ and He II λ4686 emission-line light curves indicate delays of 18 ± 5 and 16 ± 2 days, respectively, between the continuum variations and the response of the lines. We apply a maximum entropy method to solve for the transfer function that relates the Hβ and He II λ4686 lines and 4200 Å continuum variability and the result of this analysis suggests that there is a deficit of emission-line response due to gas along the line of sight to the continuum source for both lines. Using a composite off-nuclear spectrum, we synthesize the bulge stellar population, which is found to be mainly old (77% with age > 10 Gyr) with a metallicity twice the solar value. The synthesis also yields an internal color excess E(B−V) ≈0.04. The mean contribution of the stellar population to the inner 5" x 10" spectra during the campaign was ~40% .application/pdfengThe astrophysical journal. Chicago. Vol. 445, no. 2, pt. 1 (June 1995), p. 680-690Galaxias seyfertEspectros astronômicosGaláxia NGC 3227Interior estelarGalaxies: individual (NGC 3227)Galaxies: seyfertGalaxies : stellar contentSpectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000262671.pdf000262671.pdfTexto completo (inglês)application/pdf269058http://www.lume.ufrgs.br/bitstream/10183/108845/1/000262671.pdf7adaef24438eab804ff813e66fc48ad7MD51TEXT000262671.pdf.txt000262671.pdf.txtExtracted Texttext/plain242http://www.lume.ufrgs.br/bitstream/10183/108845/2/000262671.pdf.txtb93e89fee6f8b82a7b43ed36339d429bMD52THUMBNAIL000262671.pdf.jpg000262671.pdf.jpgGenerated Thumbnailimage/jpeg2170http://www.lume.ufrgs.br/bitstream/10183/108845/3/000262671.pdf.jpg35ce9e36d80e624112fd54a8193e71b7MD5310183/1088452024-04-11 06:25:50.373193oai:www.lume.ufrgs.br:10183/108845Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-11T09:25:50Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
title |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
spellingShingle |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 Winge, Claudia Galaxias seyfert Espectros astronômicos Galáxia NGC 3227 Interior estelar Galaxies: individual (NGC 3227) Galaxies: seyfert Galaxies : stellar content |
title_short |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
title_full |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
title_fullStr |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
title_full_unstemmed |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
title_sort |
Spectroscopy monitoring of active galactic nuclei from CTIO. I. NGC 3227 |
author |
Winge, Claudia |
author_facet |
Winge, Claudia Peterson, Bradley M. Horne, Keith Pogge, Richard William Pastoriza, Miriani Griselda Storchi-Bergmann, Thaisa |
author_role |
author |
author2 |
Peterson, Bradley M. Horne, Keith Pogge, Richard William Pastoriza, Miriani Griselda Storchi-Bergmann, Thaisa |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Winge, Claudia Peterson, Bradley M. Horne, Keith Pogge, Richard William Pastoriza, Miriani Griselda Storchi-Bergmann, Thaisa |
dc.subject.por.fl_str_mv |
Galaxias seyfert Espectros astronômicos Galáxia NGC 3227 Interior estelar |
topic |
Galaxias seyfert Espectros astronômicos Galáxia NGC 3227 Interior estelar Galaxies: individual (NGC 3227) Galaxies: seyfert Galaxies : stellar content |
dc.subject.eng.fl_str_mv |
Galaxies: individual (NGC 3227) Galaxies: seyfert Galaxies : stellar content |
description |
The results of a five-month monitoring campaign on the Seyfert 1.5 galaxy NGC 3227 are presented. Variability was detected in the continuum and in the broad emission lines. Cross correlations of the 4200 Å continuum light curve with the Hβ and He II λ4686 emission-line light curves indicate delays of 18 ± 5 and 16 ± 2 days, respectively, between the continuum variations and the response of the lines. We apply a maximum entropy method to solve for the transfer function that relates the Hβ and He II λ4686 lines and 4200 Å continuum variability and the result of this analysis suggests that there is a deficit of emission-line response due to gas along the line of sight to the continuum source for both lines. Using a composite off-nuclear spectrum, we synthesize the bulge stellar population, which is found to be mainly old (77% with age > 10 Gyr) with a metallicity twice the solar value. The synthesis also yields an internal color excess E(B−V) ≈0.04. The mean contribution of the stellar population to the inner 5" x 10" spectra during the campaign was ~40% . |
publishDate |
1995 |
dc.date.issued.fl_str_mv |
1995 |
dc.date.accessioned.fl_str_mv |
2015-01-08T02:13:10Z |
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http://hdl.handle.net/10183/108845 |
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0004-637X |
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000262671 |
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http://hdl.handle.net/10183/108845 |
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eng |
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The astrophysical journal. Chicago. Vol. 445, no. 2, pt. 1 (June 1995), p. 680-690 |
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