A new catalog of H i supershell candidates in the outer part of the Galaxy

Aims. The main goal of this work is to a have a new neutral hydrogen (H i) supershell candidate catalog to analyze their spatial distribution in the Galaxy and to carry out a statistical study of their main properties. Methods. This catalog was carried out making use of the Leiden-Argentine-Bonn (LA...

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Autores principales:	Suad, L.A., Caiafa, C.F., Arnal, E.M., Cichowolski, S.
Formato:	JOUR
Materias:	ISM: bubbles ISM: structure Methods: data analysis Radio lines: ISM Techniques: image processing Algorithms Image processing Ism: bubbles Methods:data analysis Galaxies
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v564_n_p_Suad
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v564_n_p_Suad
record_format	dspace
spelling	todo:paper_00046361_v564_n_p_Suad2023-10-03T14:00:48Z A new catalog of H i supershell candidates in the outer part of the Galaxy Suad, L.A. Caiafa, C.F. Arnal, E.M. Cichowolski, S. ISM: bubbles ISM: structure Methods: data analysis Radio lines: ISM Techniques: image processing Algorithms Image processing Ism: bubbles ISM: structure Methods:data analysis Radio lines: ISM Techniques: image processing Galaxies Aims. The main goal of this work is to a have a new neutral hydrogen (H i) supershell candidate catalog to analyze their spatial distribution in the Galaxy and to carry out a statistical study of their main properties. Methods. This catalog was carried out making use of the Leiden-Argentine-Bonn (LAB) survey. The supershell candidates were identified using a combination of two techniques: a visual inspection plus an automatic searching algorithm. Our automatic algorithm is able to detect both closed and open structures. Results. A total of 566 supershell candidates were identified. Most of them (347) are located in the second Galactic quadrant, while 219 were found in the third one. About 98% of a subset of 190 structures (used to derive the statistical properties of the supershell candidates) are elliptical with a mean weighted eccentricity of 0.8 ± 0.1, and ~70% have their major axes parallel to the Galactic plane. The weighted mean value of the effective radius of the structures is ~160 pc. Owing to the ability of our automatic algorithm to detect open structures, we have also identified some "galactic chimney" candidates. We find an asymmetry between the second and third Galactic quadrants in the sense that in the second one we detect structures as far as 32 kpc, while for the 3rd one the farthest structure is detected at 17 kpc. The supershell surface density in the solar neighborhood is ~8 kpc-2, and decreases as we move farther away form the Galactic center. We have also compared our catalog with those by other authors. © ESO, 2014. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v564_n_p_Suad
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	ISM: bubbles ISM: structure Methods: data analysis Radio lines: ISM Techniques: image processing Algorithms Image processing Ism: bubbles ISM: structure Methods:data analysis Radio lines: ISM Techniques: image processing Galaxies
spellingShingle	ISM: bubbles ISM: structure Methods: data analysis Radio lines: ISM Techniques: image processing Algorithms Image processing Ism: bubbles ISM: structure Methods:data analysis Radio lines: ISM Techniques: image processing Galaxies Suad, L.A. Caiafa, C.F. Arnal, E.M. Cichowolski, S. A new catalog of H i supershell candidates in the outer part of the Galaxy
topic_facet	ISM: bubbles ISM: structure Methods: data analysis Radio lines: ISM Techniques: image processing Algorithms Image processing Ism: bubbles ISM: structure Methods:data analysis Radio lines: ISM Techniques: image processing Galaxies
description	Aims. The main goal of this work is to a have a new neutral hydrogen (H i) supershell candidate catalog to analyze their spatial distribution in the Galaxy and to carry out a statistical study of their main properties. Methods. This catalog was carried out making use of the Leiden-Argentine-Bonn (LAB) survey. The supershell candidates were identified using a combination of two techniques: a visual inspection plus an automatic searching algorithm. Our automatic algorithm is able to detect both closed and open structures. Results. A total of 566 supershell candidates were identified. Most of them (347) are located in the second Galactic quadrant, while 219 were found in the third one. About 98% of a subset of 190 structures (used to derive the statistical properties of the supershell candidates) are elliptical with a mean weighted eccentricity of 0.8 ± 0.1, and ~70% have their major axes parallel to the Galactic plane. The weighted mean value of the effective radius of the structures is ~160 pc. Owing to the ability of our automatic algorithm to detect open structures, we have also identified some "galactic chimney" candidates. We find an asymmetry between the second and third Galactic quadrants in the sense that in the second one we detect structures as far as 32 kpc, while for the 3rd one the farthest structure is detected at 17 kpc. The supershell surface density in the solar neighborhood is ~8 kpc-2, and decreases as we move farther away form the Galactic center. We have also compared our catalog with those by other authors. © ESO, 2014.
format	JOUR
author	Suad, L.A. Caiafa, C.F. Arnal, E.M. Cichowolski, S.
author_facet	Suad, L.A. Caiafa, C.F. Arnal, E.M. Cichowolski, S.
author_sort	Suad, L.A.
title	A new catalog of H i supershell candidates in the outer part of the Galaxy
title_short	A new catalog of H i supershell candidates in the outer part of the Galaxy
title_full	A new catalog of H i supershell candidates in the outer part of the Galaxy
title_fullStr	A new catalog of H i supershell candidates in the outer part of the Galaxy
title_full_unstemmed	A new catalog of H i supershell candidates in the outer part of the Galaxy
title_sort	new catalog of h i supershell candidates in the outer part of the galaxy
url	http://hdl.handle.net/20.500.12110/paper_00046361_v564_n_p_Suad
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A new catalog of H i supershell candidates in the outer part of the Galaxy

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