Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog
- Autores
- Benaglia, Paula; Ishwara-Chandra, C. H.; Intema, Huib; Colazo, Marcelo E.; Gaikwad, Madhuri
- Año de publicación
- 2020
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Observations at the radio continuum band below the GHz are key when investigating the nature and properties of non-thermal sources, since at those frequencies their radio radiation is strongest. Therefore, the low radio frequency range is the best to spot possible counterparts to very high-energy (VHE) sources: relativistic particles of the same population are prone to be involved in radio and high energy radiation processes. Some of those counterparts to VHE sources can be stellar sources. Aims: The Cygnus region on the northern sky is one of the richest in this type of sources which are potential counterparts to VHE sources. We surveyed the central ~15sq deg of the Cygnus constellation at the bands of 325 and 610MHz, with angular resolutions and sensitivities of 10'' and 6'', and 0.5 and 0.2 mJy/beam, respectively. Methods: The data were collected during 172 hours along 2013 - 2017, using the Giant Metrewave Radio Telescope (GMRT) with 32MHz bandwidth, and were calibrated using the SPAM routines. The source extraction was carried out with the PyBDSF tool, followed by verification through visual inspection of every putative catalog candidate source, in order to determine its reliability. Results: In this first paper we present the catalog of sources, consisting of 1048 sources at 325MHz and 2796 sources at 610MHz. By cross-matching the sources from both frequencies with the objects of the SIMBAD database, we found possible counterparts for 143 of them. Most of the sources from the 325-MHz catalog (993) were detected at the 610MHz band, and their spectral index alpha was computed adopting S(nu) ~ nu^alpha. The spectral indices distribution shows its maximum at alpha=-1, characteristic of non-thermal emitters and possibly pointing at an extragalactic population.
Instituto Argentino de Radioastronomía - Materia
-
Ciencias Astronómicas
Catalogs
Radio continuum: general
Open clusters and associations: individual: Cyg OB2
Open clusters and associations: individual: Cyg OB8
Open clusters and associations: individual: Cyg OB9 - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/124002
Ver los metadatos del registro completo
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Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalogBenaglia, PaulaIshwara-Chandra, C. H.Intema, HuibColazo, Marcelo E.Gaikwad, MadhuriCiencias AstronómicasCatalogsRadio continuum: generalOpen clusters and associations: individual: Cyg OB2Open clusters and associations: individual: Cyg OB8Open clusters and associations: individual: Cyg OB9Observations at the radio continuum band below the GHz are key when investigating the nature and properties of non-thermal sources, since at those frequencies their radio radiation is strongest. Therefore, the low radio frequency range is the best to spot possible counterparts to very high-energy (VHE) sources: relativistic particles of the same population are prone to be involved in radio and high energy radiation processes. Some of those counterparts to VHE sources can be stellar sources. Aims: The Cygnus region on the northern sky is one of the richest in this type of sources which are potential counterparts to VHE sources. We surveyed the central ~15sq deg of the Cygnus constellation at the bands of 325 and 610MHz, with angular resolutions and sensitivities of 10'' and 6'', and 0.5 and 0.2 mJy/beam, respectively. Methods: The data were collected during 172 hours along 2013 - 2017, using the Giant Metrewave Radio Telescope (GMRT) with 32MHz bandwidth, and were calibrated using the SPAM routines. The source extraction was carried out with the PyBDSF tool, followed by verification through visual inspection of every putative catalog candidate source, in order to determine its reliability. Results: In this first paper we present the catalog of sources, consisting of 1048 sources at 325MHz and 2796 sources at 610MHz. By cross-matching the sources from both frequencies with the objects of the SIMBAD database, we found possible counterparts for 143 of them. Most of the sources from the 325-MHz catalog (993) were detected at the 610MHz band, and their spectral index alpha was computed adopting S(nu) ~ nu^alpha. The spectral indices distribution shows its maximum at alpha=-1, characteristic of non-thermal emitters and possibly pointing at an extragalactic population.Instituto Argentino de Radioastronomía2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/124002enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/issn/1432-0746info:eu-repo/semantics/altIdentifier/arxiv/2007.12679info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202037916info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:29:24Zoai:sedici.unlp.edu.ar:10915/124002Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:29:24.92SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
title |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
spellingShingle |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog Benaglia, Paula Ciencias Astronómicas Catalogs Radio continuum: general Open clusters and associations: individual: Cyg OB2 Open clusters and associations: individual: Cyg OB8 Open clusters and associations: individual: Cyg OB9 |
title_short |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
title_full |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
title_fullStr |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
title_full_unstemmed |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
title_sort |
Cygnus survey with the Giant Metrewave Radio Telescope at 325 and 610 MHz: the catalog |
dc.creator.none.fl_str_mv |
Benaglia, Paula Ishwara-Chandra, C. H. Intema, Huib Colazo, Marcelo E. Gaikwad, Madhuri |
author |
Benaglia, Paula |
author_facet |
Benaglia, Paula Ishwara-Chandra, C. H. Intema, Huib Colazo, Marcelo E. Gaikwad, Madhuri |
author_role |
author |
author2 |
Ishwara-Chandra, C. H. Intema, Huib Colazo, Marcelo E. Gaikwad, Madhuri |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Ciencias Astronómicas Catalogs Radio continuum: general Open clusters and associations: individual: Cyg OB2 Open clusters and associations: individual: Cyg OB8 Open clusters and associations: individual: Cyg OB9 |
topic |
Ciencias Astronómicas Catalogs Radio continuum: general Open clusters and associations: individual: Cyg OB2 Open clusters and associations: individual: Cyg OB8 Open clusters and associations: individual: Cyg OB9 |
dc.description.none.fl_txt_mv |
Observations at the radio continuum band below the GHz are key when investigating the nature and properties of non-thermal sources, since at those frequencies their radio radiation is strongest. Therefore, the low radio frequency range is the best to spot possible counterparts to very high-energy (VHE) sources: relativistic particles of the same population are prone to be involved in radio and high energy radiation processes. Some of those counterparts to VHE sources can be stellar sources. Aims: The Cygnus region on the northern sky is one of the richest in this type of sources which are potential counterparts to VHE sources. We surveyed the central ~15sq deg of the Cygnus constellation at the bands of 325 and 610MHz, with angular resolutions and sensitivities of 10'' and 6'', and 0.5 and 0.2 mJy/beam, respectively. Methods: The data were collected during 172 hours along 2013 - 2017, using the Giant Metrewave Radio Telescope (GMRT) with 32MHz bandwidth, and were calibrated using the SPAM routines. The source extraction was carried out with the PyBDSF tool, followed by verification through visual inspection of every putative catalog candidate source, in order to determine its reliability. Results: In this first paper we present the catalog of sources, consisting of 1048 sources at 325MHz and 2796 sources at 610MHz. By cross-matching the sources from both frequencies with the objects of the SIMBAD database, we found possible counterparts for 143 of them. Most of the sources from the 325-MHz catalog (993) were detected at the 610MHz band, and their spectral index alpha was computed adopting S(nu) ~ nu^alpha. The spectral indices distribution shows its maximum at alpha=-1, characteristic of non-thermal emitters and possibly pointing at an extragalactic population. Instituto Argentino de Radioastronomía |
description |
Observations at the radio continuum band below the GHz are key when investigating the nature and properties of non-thermal sources, since at those frequencies their radio radiation is strongest. Therefore, the low radio frequency range is the best to spot possible counterparts to very high-energy (VHE) sources: relativistic particles of the same population are prone to be involved in radio and high energy radiation processes. Some of those counterparts to VHE sources can be stellar sources. Aims: The Cygnus region on the northern sky is one of the richest in this type of sources which are potential counterparts to VHE sources. We surveyed the central ~15sq deg of the Cygnus constellation at the bands of 325 and 610MHz, with angular resolutions and sensitivities of 10'' and 6'', and 0.5 and 0.2 mJy/beam, respectively. Methods: The data were collected during 172 hours along 2013 - 2017, using the Giant Metrewave Radio Telescope (GMRT) with 32MHz bandwidth, and were calibrated using the SPAM routines. The source extraction was carried out with the PyBDSF tool, followed by verification through visual inspection of every putative catalog candidate source, in order to determine its reliability. Results: In this first paper we present the catalog of sources, consisting of 1048 sources at 325MHz and 2796 sources at 610MHz. By cross-matching the sources from both frequencies with the objects of the SIMBAD database, we found possible counterparts for 143 of them. Most of the sources from the 325-MHz catalog (993) were detected at the 610MHz band, and their spectral index alpha was computed adopting S(nu) ~ nu^alpha. The spectral indices distribution shows its maximum at alpha=-1, characteristic of non-thermal emitters and possibly pointing at an extragalactic population. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020 |
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eng |
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