High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes

Autores
Schmidt, Eduardo Osvaldo; Baravalle, Laura Daniela; Pichel, Ana Carolina; Mast, Damian; Alonso, Maria Victoria; Diaz Tello, Jorge Andres; García, L. H.; Ivanov, V. D.; Minniti, D.; Masetti, N.; Donoso Navea, Laura Gema; Zelada Bacigalupo, R.
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We aim to spectroscopically confirm the nature of VVV-J181258.71-314346.7, a candidate counterpart to the unassociated gamma-ray source 4FGLJ1812.8-3144. This object was selected based on its near-infrared photometric properties and moderate variability, as part of a broader effort to identify active galactic nuclei (AGN) behind the Galactic bulge and disc. We obtained near-infrared spectra using the Flamingos-2 instrument at Gemini South, covering the 1.1-1.8 μm range with a spectral resolution of R ~ 1200. Standard data reduction procedures were applied, including telluric correction and wavelength calibration. The analysis focused on the identification of emission lines and the estimation of the redshift using cross-correlation techniques and spectral template fitting. Despite a relatively low signal-to-noise ratio, the spectrum reveals the presence of Paβ and Fe II emission lines. The measured redshift is z = 0.206 ± 0.001, which confirms the extragalactic nature of the source. The spectral features such as line ratios and full width at half maximum are consistent with those typically observed in type-1 AGNs, particularly Seyfert 1 galaxies. This study demonstrates the ability of near-infrared spectroscopy to reveal AGNs that are obscured by highly extincted and crowded galactic fields. The confirmation of an AGN at low Galactic latitude (b ~ -6.5○) shows that near-IR surveys like VVV can successfully penetrate the zone of avoidance. Extending this approach to additional candidates is crucial for improving the census of AGNs hidden behind the Milky Way, as well as for constraining the population of unassociated gamma-ray sources in these troublesome regions.
Fil: Schmidt, Eduardo Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Baravalle, Laura Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; 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. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Alonso, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Diaz Tello, Jorge Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: García, L. H.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Ivanov, V. D.. European Southern Observatory; Alemania
Fil: Minniti, D.. Universidad Andrés Bello; Chile
Fil: Masetti, N.. Istituto Nazionale di Astrofisica; Italia
Fil: Donoso Navea, Laura Gema. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Zelada Bacigalupo, R.. North Optics Instrumentos Científicos; Chile
Materia
METHODS: OBSERVATIONAL
TECHNIQUES: SPECTROSCOPIC
INFRARED: GALAXIES
GALAXIES: ACTIVE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/276621
Acceder
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network_name_str CONICET Digital (CONICET)
spelling High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudesSchmidt, Eduardo OsvaldoBaravalle, Laura DanielaPichel, Ana CarolinaMast, DamianAlonso, Maria VictoriaDiaz Tello, Jorge AndresGarcía, L. H.Ivanov, V. D.Minniti, D.Masetti, N.Donoso Navea, Laura GemaZelada Bacigalupo, R.METHODS: OBSERVATIONALTECHNIQUES: SPECTROSCOPICINFRARED: GALAXIESGALAXIES: ACTIVEhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We aim to spectroscopically confirm the nature of VVV-J181258.71-314346.7, a candidate counterpart to the unassociated gamma-ray source 4FGLJ1812.8-3144. This object was selected based on its near-infrared photometric properties and moderate variability, as part of a broader effort to identify active galactic nuclei (AGN) behind the Galactic bulge and disc. We obtained near-infrared spectra using the Flamingos-2 instrument at Gemini South, covering the 1.1-1.8 μm range with a spectral resolution of R ~ 1200. Standard data reduction procedures were applied, including telluric correction and wavelength calibration. The analysis focused on the identification of emission lines and the estimation of the redshift using cross-correlation techniques and spectral template fitting. Despite a relatively low signal-to-noise ratio, the spectrum reveals the presence of Paβ and Fe II emission lines. The measured redshift is z = 0.206 ± 0.001, which confirms the extragalactic nature of the source. The spectral features such as line ratios and full width at half maximum are consistent with those typically observed in type-1 AGNs, particularly Seyfert 1 galaxies. This study demonstrates the ability of near-infrared spectroscopy to reveal AGNs that are obscured by highly extincted and crowded galactic fields. The confirmation of an AGN at low Galactic latitude (b ~ -6.5○) shows that near-IR surveys like VVV can successfully penetrate the zone of avoidance. Extending this approach to additional candidates is crucial for improving the census of AGNs hidden behind the Milky Way, as well as for constraining the population of unassociated gamma-ray sources in these troublesome regions.Fil: Schmidt, Eduardo Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Baravalle, Laura Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Pichel, Ana Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Mast, Damian. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Alonso, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Diaz Tello, Jorge Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: García, L. H.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; ArgentinaFil: Ivanov, V. D.. European Southern Observatory; AlemaniaFil: Minniti, D.. Universidad Andrés Bello; ChileFil: Masetti, N.. Istituto Nazionale di Astrofisica; ItaliaFil: Donoso Navea, Laura Gema. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Zelada Bacigalupo, R.. North Optics Instrumentos Científicos; ChileWiley Blackwell Publishing, Inc2025-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/276621Schmidt, Eduardo Osvaldo; Baravalle, Laura Daniela; Pichel, Ana Carolina; Mast, Damian; Alonso, Maria Victoria; et al.; High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 544; 1; 10-2025; 152-1590035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staf1691/8275911info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staf1691info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-05-06T16:40:24Zoai:ri.conicet.gov.ar:11336/276621instacron: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:34982026-05-06 16:40:25.358CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
title High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
spellingShingle High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
Schmidt, Eduardo Osvaldo
METHODS: OBSERVATIONAL
TECHNIQUES: SPECTROSCOPIC
INFRARED: GALAXIES
GALAXIES: ACTIVE
title_short High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
title_full High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
title_fullStr High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
title_full_unstemmed High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
title_sort High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes
dc.creator.none.fl_str_mv Schmidt, Eduardo Osvaldo
Baravalle, Laura Daniela
Pichel, Ana Carolina
Mast, Damian
Alonso, Maria Victoria
Diaz Tello, Jorge Andres
García, L. H.
Ivanov, V. D.
Minniti, D.
Masetti, N.
Donoso Navea, Laura Gema
Zelada Bacigalupo, R.
author Schmidt, Eduardo Osvaldo
author_facet Schmidt, Eduardo Osvaldo
Baravalle, Laura Daniela
Pichel, Ana Carolina
Mast, Damian
Alonso, Maria Victoria
Diaz Tello, Jorge Andres
García, L. H.
Ivanov, V. D.
Minniti, D.
Masetti, N.
Donoso Navea, Laura Gema
Zelada Bacigalupo, R.
author_role author
author2 Baravalle, Laura Daniela
Pichel, Ana Carolina
Mast, Damian
Alonso, Maria Victoria
Diaz Tello, Jorge Andres
García, L. H.
Ivanov, V. D.
Minniti, D.
Masetti, N.
Donoso Navea, Laura Gema
Zelada Bacigalupo, R.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv METHODS: OBSERVATIONAL
TECHNIQUES: SPECTROSCOPIC
INFRARED: GALAXIES
GALAXIES: ACTIVE
topic METHODS: OBSERVATIONAL
TECHNIQUES: SPECTROSCOPIC
INFRARED: GALAXIES
GALAXIES: ACTIVE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We aim to spectroscopically confirm the nature of VVV-J181258.71-314346.7, a candidate counterpart to the unassociated gamma-ray source 4FGLJ1812.8-3144. This object was selected based on its near-infrared photometric properties and moderate variability, as part of a broader effort to identify active galactic nuclei (AGN) behind the Galactic bulge and disc. We obtained near-infrared spectra using the Flamingos-2 instrument at Gemini South, covering the 1.1-1.8 μm range with a spectral resolution of R ~ 1200. Standard data reduction procedures were applied, including telluric correction and wavelength calibration. The analysis focused on the identification of emission lines and the estimation of the redshift using cross-correlation techniques and spectral template fitting. Despite a relatively low signal-to-noise ratio, the spectrum reveals the presence of Paβ and Fe II emission lines. The measured redshift is z = 0.206 ± 0.001, which confirms the extragalactic nature of the source. The spectral features such as line ratios and full width at half maximum are consistent with those typically observed in type-1 AGNs, particularly Seyfert 1 galaxies. This study demonstrates the ability of near-infrared spectroscopy to reveal AGNs that are obscured by highly extincted and crowded galactic fields. The confirmation of an AGN at low Galactic latitude (b ~ -6.5○) shows that near-IR surveys like VVV can successfully penetrate the zone of avoidance. Extending this approach to additional candidates is crucial for improving the census of AGNs hidden behind the Milky Way, as well as for constraining the population of unassociated gamma-ray sources in these troublesome regions.
Fil: Schmidt, Eduardo Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Baravalle, Laura Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; 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. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Alonso, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Diaz Tello, Jorge Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: García, L. H.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Ivanov, V. D.. European Southern Observatory; Alemania
Fil: Minniti, D.. Universidad Andrés Bello; Chile
Fil: Masetti, N.. Istituto Nazionale di Astrofisica; Italia
Fil: Donoso Navea, Laura Gema. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Zelada Bacigalupo, R.. North Optics Instrumentos Científicos; Chile
description We aim to spectroscopically confirm the nature of VVV-J181258.71-314346.7, a candidate counterpart to the unassociated gamma-ray source 4FGLJ1812.8-3144. This object was selected based on its near-infrared photometric properties and moderate variability, as part of a broader effort to identify active galactic nuclei (AGN) behind the Galactic bulge and disc. We obtained near-infrared spectra using the Flamingos-2 instrument at Gemini South, covering the 1.1-1.8 μm range with a spectral resolution of R ~ 1200. Standard data reduction procedures were applied, including telluric correction and wavelength calibration. The analysis focused on the identification of emission lines and the estimation of the redshift using cross-correlation techniques and spectral template fitting. Despite a relatively low signal-to-noise ratio, the spectrum reveals the presence of Paβ and Fe II emission lines. The measured redshift is z = 0.206 ± 0.001, which confirms the extragalactic nature of the source. The spectral features such as line ratios and full width at half maximum are consistent with those typically observed in type-1 AGNs, particularly Seyfert 1 galaxies. This study demonstrates the ability of near-infrared spectroscopy to reveal AGNs that are obscured by highly extincted and crowded galactic fields. The confirmation of an AGN at low Galactic latitude (b ~ -6.5○) shows that near-IR surveys like VVV can successfully penetrate the zone of avoidance. Extending this approach to additional candidates is crucial for improving the census of AGNs hidden behind the Milky Way, as well as for constraining the population of unassociated gamma-ray sources in these troublesome regions.
publishDate 2025
dc.date.none.fl_str_mv 2025-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/276621
Schmidt, Eduardo Osvaldo; Baravalle, Laura Daniela; Pichel, Ana Carolina; Mast, Damian; Alonso, Maria Victoria; et al.; High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 544; 1; 10-2025; 152-159
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/276621
identifier_str_mv Schmidt, Eduardo Osvaldo; Baravalle, Laura Daniela; Pichel, Ana Carolina; Mast, Damian; Alonso, Maria Victoria; et al.; High energy gamma-ray sources in the VVV survey – III. Spectroscopic confirmation of an AGN at low Galactic latitudes; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 544; 1; 10-2025; 152-159
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staf1691/8275911
info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staf1691
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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