Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/115407 |
Resumo: | Molecular clouds at very high latitude (b > 60°) away from the Galactic plane are rare and in general are expected to be non-star-forming. However, we report the discovery of two embedded clusters (Camargo 438 and Camargo 439) within the high-latitude molecular cloud HRK 81.4−77.8 using WISE. Camargo 439 with Galactic coordinates = 81°.11 and b = −77°.84 is an ∼2 Myr embedded cluster (EC) located at a distance from the Sun of d๏ = 5.09 ± 0.47 kpc. Adopting the distance of the Sun to the Galactic Centre R๏ = 7.2 kpc, we derive for Camargo 439 a Galactocentric distance of RGC = 8.70 ± 0.26 kpc and a vertical distance from the plane of −4.97 ± 0.46 kpc. Camargo 438 at = 79°.66 and b = −78°.86 presents similar values. The derived parameters for these two ECs put HRK 81.4−77.8 in the halo at a distance from the Galactic Centre of ∼8.7 kpc and ∼5.0 kpc from the disc. Star clusters provide the only direct means to determine the high-latitude molecular cloud distances. The present study shows that the molecular cloud HRK 81.4−77.8 is currently forming stars, apparently an unprecedented event detected so far among high-latitude clouds. We carried out a preliminary orbit analysis. It shows that these ECs are the most distant known ECs from the plane and both cloud and clusters are probably falling ballistically from the halo on to the Galactic disc, or performing a flyby. |
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Camargo, Denilso da SilvaBica, Eduardo Luiz DamianiBonatto, Charles JoseSalerno, Gustavo Malta2015-04-17T01:58:08Z20150035-8711http://hdl.handle.net/10183/115407000963655Molecular clouds at very high latitude (b > 60°) away from the Galactic plane are rare and in general are expected to be non-star-forming. However, we report the discovery of two embedded clusters (Camargo 438 and Camargo 439) within the high-latitude molecular cloud HRK 81.4−77.8 using WISE. Camargo 439 with Galactic coordinates = 81°.11 and b = −77°.84 is an ∼2 Myr embedded cluster (EC) located at a distance from the Sun of d๏ = 5.09 ± 0.47 kpc. Adopting the distance of the Sun to the Galactic Centre R๏ = 7.2 kpc, we derive for Camargo 439 a Galactocentric distance of RGC = 8.70 ± 0.26 kpc and a vertical distance from the plane of −4.97 ± 0.46 kpc. Camargo 438 at = 79°.66 and b = −78°.86 presents similar values. The derived parameters for these two ECs put HRK 81.4−77.8 in the halo at a distance from the Galactic Centre of ∼8.7 kpc and ∼5.0 kpc from the disc. Star clusters provide the only direct means to determine the high-latitude molecular cloud distances. The present study shows that the molecular cloud HRK 81.4−77.8 is currently forming stars, apparently an unprecedented event detected so far among high-latitude clouds. We carried out a preliminary orbit analysis. It shows that these ECs are the most distant known ECs from the plane and both cloud and clusters are probably falling ballistically from the halo on to the Galactic disc, or performing a flyby.application/pdfengMonthly notices of the Royal Astronomical Society. Oxford. Vol. 448, no. 2 (Apr. 2015), p. 1930-1936Aglomerados estelaresNuvens moleculares interestelaresCinemáticaISM: cloudsISM: kinematics and dynamicsOpen clusters and associations: generalDiscovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8Estrangeiroinfo: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:UFRGSTEXT000963655.pdf.txt000963655.pdf.txtExtracted Texttext/plain26488http://www.lume.ufrgs.br/bitstream/10183/115407/2/000963655.pdf.txt68cf51cc38f071312dfdb0b2b38d9c8fMD52ORIGINAL000963655.pdf000963655.pdfTexto completo (inglês)application/pdf1074751http://www.lume.ufrgs.br/bitstream/10183/115407/1/000963655.pdfefdead4b99ab70f979d7954641dfa416MD51THUMBNAIL000963655.pdf.jpg000963655.pdf.jpgGenerated Thumbnailimage/jpeg2090http://www.lume.ufrgs.br/bitstream/10183/115407/3/000963655.pdf.jpgf0ac41d2188916c45bb7333a837e7d60MD5310183/1154072023-07-15 03:28:42.689489oai:www.lume.ufrgs.br:10183/115407Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:28:42Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
title |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
spellingShingle |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 Camargo, Denilso da Silva Aglomerados estelares Nuvens moleculares interestelares Cinemática ISM: clouds ISM: kinematics and dynamics Open clusters and associations: general |
title_short |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
title_full |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
title_fullStr |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
title_full_unstemmed |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
title_sort |
Discovery of two embedded clusters with WISE in the high Galactic latitude cloud HRK 81.4−77.8 |
author |
Camargo, Denilso da Silva |
author_facet |
Camargo, Denilso da Silva Bica, Eduardo Luiz Damiani Bonatto, Charles Jose Salerno, Gustavo Malta |
author_role |
author |
author2 |
Bica, Eduardo Luiz Damiani Bonatto, Charles Jose Salerno, Gustavo Malta |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Camargo, Denilso da Silva Bica, Eduardo Luiz Damiani Bonatto, Charles Jose Salerno, Gustavo Malta |
dc.subject.por.fl_str_mv |
Aglomerados estelares Nuvens moleculares interestelares Cinemática |
topic |
Aglomerados estelares Nuvens moleculares interestelares Cinemática ISM: clouds ISM: kinematics and dynamics Open clusters and associations: general |
dc.subject.eng.fl_str_mv |
ISM: clouds ISM: kinematics and dynamics Open clusters and associations: general |
description |
Molecular clouds at very high latitude (b > 60°) away from the Galactic plane are rare and in general are expected to be non-star-forming. However, we report the discovery of two embedded clusters (Camargo 438 and Camargo 439) within the high-latitude molecular cloud HRK 81.4−77.8 using WISE. Camargo 439 with Galactic coordinates = 81°.11 and b = −77°.84 is an ∼2 Myr embedded cluster (EC) located at a distance from the Sun of d๏ = 5.09 ± 0.47 kpc. Adopting the distance of the Sun to the Galactic Centre R๏ = 7.2 kpc, we derive for Camargo 439 a Galactocentric distance of RGC = 8.70 ± 0.26 kpc and a vertical distance from the plane of −4.97 ± 0.46 kpc. Camargo 438 at = 79°.66 and b = −78°.86 presents similar values. The derived parameters for these two ECs put HRK 81.4−77.8 in the halo at a distance from the Galactic Centre of ∼8.7 kpc and ∼5.0 kpc from the disc. Star clusters provide the only direct means to determine the high-latitude molecular cloud distances. The present study shows that the molecular cloud HRK 81.4−77.8 is currently forming stars, apparently an unprecedented event detected so far among high-latitude clouds. We carried out a preliminary orbit analysis. It shows that these ECs are the most distant known ECs from the plane and both cloud and clusters are probably falling ballistically from the halo on to the Galactic disc, or performing a flyby. |
publishDate |
2015 |
dc.date.accessioned.fl_str_mv |
2015-04-17T01:58:08Z |
dc.date.issued.fl_str_mv |
2015 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
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publishedVersion |
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http://hdl.handle.net/10183/115407 |
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0035-8711 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000963655 |
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url |
http://hdl.handle.net/10183/115407 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the Royal Astronomical Society. Oxford. Vol. 448, no. 2 (Apr. 2015), p. 1930-1936 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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