The long bar as seen by the VVV survey: I. Colour-magnitude diagrams

C. González-Fernández, M. López-Corredoira, E. B. Amôres, D. Minniti, P. Lucas, I. Toledo

Resultado de la investigación: Review article

12 Citas (Scopus)

Resumen

The VISTA Variable Survey (VVV) is able to map the Galaxy at l < with an unpaired depth (at least 3 mag deeper than 2MASS), opening new possibilities for studying the inner structure of the Milky Way. Aims. In this paper we concentrate on the exploitation of these data to better understand the spatial disposition and distribution of the structures present in the inner Milky Way, particularly the Long Bar and its interaction with the inner disc. Methods. To attain this, we present the Ks vs. J ? Ks diagrams obtained with VVV of regions with (?20? < l < ?8?, |b| < 2?). From them we derive the distribution of red clump giants with heliocentric distance as a proxy for the overall stellar structure of the Galaxy. Along with these diagrams, we analysed the distribution of photometrically selected red supergiants, in order to detect events of recent stellar formation. Results. The observations show the presence of a clear overdensity of stars with associated recent stellar formation that we interpret as the traces of the Long Bar, and we derive an angle for it of 41? ± 5? with the Sun-Galactic centre line, touching the disc near l = 27? and l = ?12?. The colour magnitude diagrams presented here also show a lack of disc stars in several lines of sight, a fact that we associate with the truncation of the disc by the potential of this bar for RGC<pc.

Idioma originalEnglish
Número de artículoA107
PublicaciónAstronomy and Astrophysics
Volumen546
DOI
EstadoPublished - 2012

Huella dactilar

color-magnitude diagram
diagram
diagrams
galaxies
stellar structure
stars
clumps
exploitation
line of sight
sun
distribution
approximation
interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

González-Fernández, C., López-Corredoira, M., Amôres, E. B., Minniti, D., Lucas, P., & Toledo, I. (2012). The long bar as seen by the VVV survey: I. Colour-magnitude diagrams. Astronomy and Astrophysics, 546, [A107]. https://doi.org/10.1051/0004-6361/201219756
González-Fernández, C. ; López-Corredoira, M. ; Amôres, E. B. ; Minniti, D. ; Lucas, P. ; Toledo, I. / The long bar as seen by the VVV survey : I. Colour-magnitude diagrams. En: Astronomy and Astrophysics. 2012 ; Vol. 546.
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abstract = "The VISTA Variable Survey (VVV) is able to map the Galaxy at l < with an unpaired depth (at least 3 mag deeper than 2MASS), opening new possibilities for studying the inner structure of the Milky Way. Aims. In this paper we concentrate on the exploitation of these data to better understand the spatial disposition and distribution of the structures present in the inner Milky Way, particularly the Long Bar and its interaction with the inner disc. Methods. To attain this, we present the Ks vs. J ? Ks diagrams obtained with VVV of regions with (?20? < l < ?8?, |b| < 2?). From them we derive the distribution of red clump giants with heliocentric distance as a proxy for the overall stellar structure of the Galaxy. Along with these diagrams, we analysed the distribution of photometrically selected red supergiants, in order to detect events of recent stellar formation. Results. The observations show the presence of a clear overdensity of stars with associated recent stellar formation that we interpret as the traces of the Long Bar, and we derive an angle for it of 41? ± 5? with the Sun-Galactic centre line, touching the disc near l = 27? and l = ?12?. The colour magnitude diagrams presented here also show a lack of disc stars in several lines of sight, a fact that we associate with the truncation of the disc by the potential of this bar for RGC",
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González-Fernández, C, López-Corredoira, M, Amôres, EB, Minniti, D, Lucas, P & Toledo, I 2012, 'The long bar as seen by the VVV survey: I. Colour-magnitude diagrams', Astronomy and Astrophysics, vol. 546, A107. https://doi.org/10.1051/0004-6361/201219756

The long bar as seen by the VVV survey : I. Colour-magnitude diagrams. / González-Fernández, C.; López-Corredoira, M.; Amôres, E. B.; Minniti, D.; Lucas, P.; Toledo, I.

En: Astronomy and Astrophysics, Vol. 546, A107, 2012.

Resultado de la investigación: Review article

TY - JOUR

T1 - The long bar as seen by the VVV survey

T2 - I. Colour-magnitude diagrams

AU - González-Fernández, C.

AU - López-Corredoira, M.

AU - Amôres, E. B.

AU - Minniti, D.

AU - Lucas, P.

AU - Toledo, I.

PY - 2012

Y1 - 2012

N2 - The VISTA Variable Survey (VVV) is able to map the Galaxy at l < with an unpaired depth (at least 3 mag deeper than 2MASS), opening new possibilities for studying the inner structure of the Milky Way. Aims. In this paper we concentrate on the exploitation of these data to better understand the spatial disposition and distribution of the structures present in the inner Milky Way, particularly the Long Bar and its interaction with the inner disc. Methods. To attain this, we present the Ks vs. J ? Ks diagrams obtained with VVV of regions with (?20? < l < ?8?, |b| < 2?). From them we derive the distribution of red clump giants with heliocentric distance as a proxy for the overall stellar structure of the Galaxy. Along with these diagrams, we analysed the distribution of photometrically selected red supergiants, in order to detect events of recent stellar formation. Results. The observations show the presence of a clear overdensity of stars with associated recent stellar formation that we interpret as the traces of the Long Bar, and we derive an angle for it of 41? ± 5? with the Sun-Galactic centre line, touching the disc near l = 27? and l = ?12?. The colour magnitude diagrams presented here also show a lack of disc stars in several lines of sight, a fact that we associate with the truncation of the disc by the potential of this bar for RGC

AB - The VISTA Variable Survey (VVV) is able to map the Galaxy at l < with an unpaired depth (at least 3 mag deeper than 2MASS), opening new possibilities for studying the inner structure of the Milky Way. Aims. In this paper we concentrate on the exploitation of these data to better understand the spatial disposition and distribution of the structures present in the inner Milky Way, particularly the Long Bar and its interaction with the inner disc. Methods. To attain this, we present the Ks vs. J ? Ks diagrams obtained with VVV of regions with (?20? < l < ?8?, |b| < 2?). From them we derive the distribution of red clump giants with heliocentric distance as a proxy for the overall stellar structure of the Galaxy. Along with these diagrams, we analysed the distribution of photometrically selected red supergiants, in order to detect events of recent stellar formation. Results. The observations show the presence of a clear overdensity of stars with associated recent stellar formation that we interpret as the traces of the Long Bar, and we derive an angle for it of 41? ± 5? with the Sun-Galactic centre line, touching the disc near l = 27? and l = ?12?. The colour magnitude diagrams presented here also show a lack of disc stars in several lines of sight, a fact that we associate with the truncation of the disc by the potential of this bar for RGC

KW - Galaxy: Stellar content

KW - Galaxy: structure

KW - Infrared: Stars

KW - Supergiants

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U2 - 10.1051/0004-6361/201219756

DO - 10.1051/0004-6361/201219756

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SN - 0004-6361

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