An Infrared View of the Obscured AGN Environment in NGC 4945
- Autores
- Gaspar, Gaia; Díaz, R. J.; Mast, Damian; Agüero, Maria Paz; Schirmer, M.; Günthardt, G.; Schmidt, Eduardo Osvaldo
- Año de publicación
- 2022
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- NGC 4945 harbors one of the nearest active galactic nuclei (AGNs), which allows us to reach high spatial resolution with current observational facilities. The Seyfert 2 nucleus is deeply obscured by an edge-on disk with A V ∼14, requiring infrared observations to study circumnuclear structures and the interstellar medium. In this work, we present an imaging and long-slit spectroscopic study of the nuclear region with a spatial resolution of 6.5 pc, based on Flamingos-2 (F2) and T-ReCS data taken at the Gemini South observatory. We report subarcsecond photometric measurements of the nucleus in J, H, and K s filters, and at larger apertures. We do not detect nuclear variability. The nuclear spectra confirm that even in the K band the AGN emission-line features are completely obscured by dust. We detect a circumnuclear disk in the K band as well as in the mid-infrared N and Q abands, with a radial scale length of ∼120 pc. The disk shows knots mostly in a ring-like arrangement that has been previously detected with Paα observations from the Hubble Space Telescope, indicating that these are deeply embedded, massive young star clusters. We present here the spectrum of one of the brightest unresolved objects (R < 5 pc), which we identify as a super star cluster candidate with MKs-16.6±0.4 . For the circumnuclear region, a detailed rotation curve allows us to measure a nuclear mass of M = (4.4 ± 3) × 106 M ⊙ within a radius of ∼6.5 pc. We also report the detection of hot dust (∼1000 K) out to a nuclear distance of 80 pc measured along the semimajor axis.
Fil: Gaspar, Gaia. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Díaz, R. J.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Mast, Damian. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Agüero, Maria Paz. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Schirmer, M.. Max-Planck-Institut für Astronomie; Alemania
Fil: Günthardt, G.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Schmidt, Eduardo Osvaldo. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina - Materia
-
ACTIVE GALACTIC NUCLEI
SUPERMASIVE BLACK HOLE
NEAR INFRARED ASTRONOMY
GALAXIES - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/220723
Ver los metadatos del registro completo
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An Infrared View of the Obscured AGN Environment in NGC 4945Gaspar, GaiaDíaz, R. J.Mast, DamianAgüero, Maria PazSchirmer, M.Günthardt, G.Schmidt, Eduardo OsvaldoACTIVE GALACTIC NUCLEISUPERMASIVE BLACK HOLENEAR INFRARED ASTRONOMYGALAXIEShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1NGC 4945 harbors one of the nearest active galactic nuclei (AGNs), which allows us to reach high spatial resolution with current observational facilities. The Seyfert 2 nucleus is deeply obscured by an edge-on disk with A V ∼14, requiring infrared observations to study circumnuclear structures and the interstellar medium. In this work, we present an imaging and long-slit spectroscopic study of the nuclear region with a spatial resolution of 6.5 pc, based on Flamingos-2 (F2) and T-ReCS data taken at the Gemini South observatory. We report subarcsecond photometric measurements of the nucleus in J, H, and K s filters, and at larger apertures. We do not detect nuclear variability. The nuclear spectra confirm that even in the K band the AGN emission-line features are completely obscured by dust. We detect a circumnuclear disk in the K band as well as in the mid-infrared N and Q abands, with a radial scale length of ∼120 pc. The disk shows knots mostly in a ring-like arrangement that has been previously detected with Paα observations from the Hubble Space Telescope, indicating that these are deeply embedded, massive young star clusters. We present here the spectrum of one of the brightest unresolved objects (R < 5 pc), which we identify as a super star cluster candidate with MKs-16.6±0.4 . For the circumnuclear region, a detailed rotation curve allows us to measure a nuclear mass of M = (4.4 ± 3) × 106 M ⊙ within a radius of ∼6.5 pc. We also report the detection of hot dust (∼1000 K) out to a nuclear distance of 80 pc measured along the semimajor axis.Fil: Gaspar, Gaia. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Díaz, R. J.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Mast, Damian. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Agüero, Maria Paz. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Schirmer, M.. Max-Planck-Institut für Astronomie; AlemaniaFil: Günthardt, G.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Schmidt, Eduardo Osvaldo. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaIOP Publishing2022-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/220723Gaspar, Gaia; Díaz, R. J.; Mast, Damian; Agüero, Maria Paz; Schirmer, M.; et al.; An Infrared View of the Obscured AGN Environment in NGC 4945; IOP Publishing; Astronomical Journal; 163; 5; 5-2022; 230-2430004-6256CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-3881/ac5ea4info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/ac5ea4info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:40:10Zoai:ri.conicet.gov.ar:11336/220723instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:40:10.729CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| title |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| spellingShingle |
An Infrared View of the Obscured AGN Environment in NGC 4945 Gaspar, Gaia ACTIVE GALACTIC NUCLEI SUPERMASIVE BLACK HOLE NEAR INFRARED ASTRONOMY GALAXIES |
| title_short |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| title_full |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| title_fullStr |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| title_full_unstemmed |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| title_sort |
An Infrared View of the Obscured AGN Environment in NGC 4945 |
| dc.creator.none.fl_str_mv |
Gaspar, Gaia Díaz, R. J. Mast, Damian Agüero, Maria Paz Schirmer, M. Günthardt, G. Schmidt, Eduardo Osvaldo |
| author |
Gaspar, Gaia |
| author_facet |
Gaspar, Gaia Díaz, R. J. Mast, Damian Agüero, Maria Paz Schirmer, M. Günthardt, G. Schmidt, Eduardo Osvaldo |
| author_role |
author |
| author2 |
Díaz, R. J. Mast, Damian Agüero, Maria Paz Schirmer, M. Günthardt, G. Schmidt, Eduardo Osvaldo |
| author2_role |
author author author author author author |
| dc.subject.none.fl_str_mv |
ACTIVE GALACTIC NUCLEI SUPERMASIVE BLACK HOLE NEAR INFRARED ASTRONOMY GALAXIES |
| topic |
ACTIVE GALACTIC NUCLEI SUPERMASIVE BLACK HOLE NEAR INFRARED ASTRONOMY GALAXIES |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
NGC 4945 harbors one of the nearest active galactic nuclei (AGNs), which allows us to reach high spatial resolution with current observational facilities. The Seyfert 2 nucleus is deeply obscured by an edge-on disk with A V ∼14, requiring infrared observations to study circumnuclear structures and the interstellar medium. In this work, we present an imaging and long-slit spectroscopic study of the nuclear region with a spatial resolution of 6.5 pc, based on Flamingos-2 (F2) and T-ReCS data taken at the Gemini South observatory. We report subarcsecond photometric measurements of the nucleus in J, H, and K s filters, and at larger apertures. We do not detect nuclear variability. The nuclear spectra confirm that even in the K band the AGN emission-line features are completely obscured by dust. We detect a circumnuclear disk in the K band as well as in the mid-infrared N and Q abands, with a radial scale length of ∼120 pc. The disk shows knots mostly in a ring-like arrangement that has been previously detected with Paα observations from the Hubble Space Telescope, indicating that these are deeply embedded, massive young star clusters. We present here the spectrum of one of the brightest unresolved objects (R < 5 pc), which we identify as a super star cluster candidate with MKs-16.6±0.4 . For the circumnuclear region, a detailed rotation curve allows us to measure a nuclear mass of M = (4.4 ± 3) × 106 M ⊙ within a radius of ∼6.5 pc. We also report the detection of hot dust (∼1000 K) out to a nuclear distance of 80 pc measured along the semimajor axis. Fil: Gaspar, Gaia. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Díaz, R. J.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina Fil: Mast, Damian. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Agüero, Maria Paz. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina Fil: Schirmer, M.. Max-Planck-Institut für Astronomie; Alemania Fil: Günthardt, G.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina Fil: Schmidt, Eduardo Osvaldo. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina |
| description |
NGC 4945 harbors one of the nearest active galactic nuclei (AGNs), which allows us to reach high spatial resolution with current observational facilities. The Seyfert 2 nucleus is deeply obscured by an edge-on disk with A V ∼14, requiring infrared observations to study circumnuclear structures and the interstellar medium. In this work, we present an imaging and long-slit spectroscopic study of the nuclear region with a spatial resolution of 6.5 pc, based on Flamingos-2 (F2) and T-ReCS data taken at the Gemini South observatory. We report subarcsecond photometric measurements of the nucleus in J, H, and K s filters, and at larger apertures. We do not detect nuclear variability. The nuclear spectra confirm that even in the K band the AGN emission-line features are completely obscured by dust. We detect a circumnuclear disk in the K band as well as in the mid-infrared N and Q abands, with a radial scale length of ∼120 pc. The disk shows knots mostly in a ring-like arrangement that has been previously detected with Paα observations from the Hubble Space Telescope, indicating that these are deeply embedded, massive young star clusters. We present here the spectrum of one of the brightest unresolved objects (R < 5 pc), which we identify as a super star cluster candidate with MKs-16.6±0.4 . For the circumnuclear region, a detailed rotation curve allows us to measure a nuclear mass of M = (4.4 ± 3) × 106 M ⊙ within a radius of ∼6.5 pc. We also report the detection of hot dust (∼1000 K) out to a nuclear distance of 80 pc measured along the semimajor axis. |
| publishDate |
2022 |
| dc.date.none.fl_str_mv |
2022-05 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://hdl.handle.net/11336/220723 Gaspar, Gaia; Díaz, R. J.; Mast, Damian; Agüero, Maria Paz; Schirmer, M.; et al.; An Infrared View of the Obscured AGN Environment in NGC 4945; IOP Publishing; Astronomical Journal; 163; 5; 5-2022; 230-243 0004-6256 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/220723 |
| identifier_str_mv |
Gaspar, Gaia; Díaz, R. J.; Mast, Damian; Agüero, Maria Paz; Schirmer, M.; et al.; An Infrared View of the Obscured AGN Environment in NGC 4945; IOP Publishing; Astronomical Journal; 163; 5; 5-2022; 230-243 0004-6256 CONICET Digital CONICET |
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eng |
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IOP Publishing |
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