The thickening of the thin disk in the third galactic quadrant

In the third Galactic quadrant (180° ≤ l ≤ 270°) of the Milky Way, the Galactic thin disk exhibits a significant Warp-shown both by gas and young stars-bending down a few kiloparsecs below the formal Galactic plane (b = 0°). This warp shows its maximum at l ∼ 240°, in the direction of the Canis Majo...

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Detalles Bibliográficos
Autores principales:	Carraro, Giovanni, Vázquez, Rubén Ángel, Acosta, Edgardo, Ahumada, Javier A., Giorgi, Edgard Ervar Salvador
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2015
Materias:	Ciencias Astronómicas Galaxy: disk Galaxy: structure Hertzsprung-Russell and C-M diagrams open clusters and associations: general open clusters and associations: individual (Haffner 20 Haffner 21 NGC 2345 NGC 2374 Trumpler 9)
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/86463
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-86463
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas Galaxy: disk Galaxy: structure Hertzsprung-Russell and C-M diagrams open clusters and associations: general open clusters and associations: individual (Haffner 20 Haffner 21 NGC 2345 NGC 2374 Trumpler 9)
spellingShingle	Ciencias Astronómicas Galaxy: disk Galaxy: structure Hertzsprung-Russell and C-M diagrams open clusters and associations: general open clusters and associations: individual (Haffner 20 Haffner 21 NGC 2345 NGC 2374 Trumpler 9) Carraro, Giovanni Vázquez, Rubén Ángel Acosta, Edgardo Ahumada, Javier A. Giorgi, Edgard Ervar Salvador The thickening of the thin disk in the third galactic quadrant
topic_facet	Ciencias Astronómicas Galaxy: disk Galaxy: structure Hertzsprung-Russell and C-M diagrams open clusters and associations: general open clusters and associations: individual (Haffner 20 Haffner 21 NGC 2345 NGC 2374 Trumpler 9)
description	In the third Galactic quadrant (180° ≤ l ≤ 270°) of the Milky Way, the Galactic thin disk exhibits a significant Warp-shown both by gas and young stars-bending down a few kiloparsecs below the formal Galactic plane (b = 0°). This warp shows its maximum at l ∼ 240°, in the direction of the Canis Major constellation. In a series of papers, we have traced the detailed structure of this region using open star clusters, putting particular emphasis on the spiral structure of the outer disk. We noted a conspicuous accumulation of young star clusters within 2-3 kpc from the Sun and close to b = 0°, which we interpreted as the continuation of the Local (Orion) arm toward the outer disk. While most clusters (and young stars in their background) closely follow the warp of the disk, our decade-old survey of the spiral structure of this region led us to identify three clusters, Haffner 18 (1 and 2) and Haffner 19, which remain very close to b = 0° and lie at distances (4.5, ∼8.0, and 6.4 kpc) where most of the material is already significantly warped. Here, we report on a search for clusters that share the same properties as Haffner 18 and 19, and investigate the possible reasons for such an unexpected occurrence. We present UBVRI photometry of five young clusters, namely NGC 2345, NGC 2374, Trumpler 9, Haffner 20, and Haffner 21, which also lie close to the formal Galactic plane. With the exception of Haffner 20, in the background of these clusters we detected young stars that appear close to b = 0° and are located at distances up to ∼8 kpc from the Sun, thus deviating significantly from the warp. These populations define a structure that distributes over almost the entire third Galactic quadrant. We discuss this structure in the context of a possible thin disk flaring, similar to the Galactic thick disk.
format	Articulo Articulo
author	Carraro, Giovanni Vázquez, Rubén Ángel Acosta, Edgardo Ahumada, Javier A. Giorgi, Edgard Ervar Salvador
author_facet	Carraro, Giovanni Vázquez, Rubén Ángel Acosta, Edgardo Ahumada, Javier A. Giorgi, Edgard Ervar Salvador
author_sort	Carraro, Giovanni
title	The thickening of the thin disk in the third galactic quadrant
title_short	The thickening of the thin disk in the third galactic quadrant
title_full	The thickening of the thin disk in the third galactic quadrant
title_fullStr	The thickening of the thin disk in the third galactic quadrant
title_full_unstemmed	The thickening of the thin disk in the third galactic quadrant
title_sort	thickening of the thin disk in the third galactic quadrant
publishDate	2015
url	http://sedici.unlp.edu.ar/handle/10915/86463
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The thickening of the thin disk in the third galactic quadrant

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