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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The long bar as seen by the VVV Survey II. Star counts

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Autor(es):
Amores, E. B. [1, 2, 3] ; Lopez-Corredoira, M. [4, 5] ; Gonzalez-Fernandez, C. [6] ; Moitinho, A. [1] ; Minniti, D. [7, 8, 9] ; Gurovich, S. [10, 11]
Número total de Autores: 6
Afiliação do(s) autor(es):
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[1] Univ Lisbon, Fac Ciencias, SIM, P-1749016 Lisbon - Portugal
[2] UEFS, Dept Fis, BR-44036900 Novo Horizonte, Feira De Santan - Brazil
[3] UEFS, Observ Astron Antares, BR-44024432 Jardim Cruzeiro, Feira De Santan - Brazil
[4] Univ La Laguna, Dept Astrofis, E-38206 Tenerife - Spain
[5] IAC, San Cristobal la Laguna 38200, Tenerife - Spain
[6] Univ Alicante, Dept Fis Ingn Sistemas & Teoria Senal, E-03080 Alicante - Spain
[7] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago - Chile
[8] Vatican Observ, I-00120 Vatican City - Vatican
[9] Univ Andres Bello, Dept Ciencias Fis, Santiago 8370134 - Chile
[10] Univ Nacl Cordoba, Observ Astron Cordoba, RA-5000 Cordoba - Argentina
[11] Inst Astron Teor & Expt IATE CONICET, Santa Fe - Argentina
Número total de Afiliações: 11
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 559, NOV 2013.
Citações Web of Science: 8
Resumo

Context. There is still some debate about the presence and the morphological properties of the long bar in the inner Galaxy. Aims. We investigate the morphological properties of the long Galactic bar using the VVV survey extending star counts at least 3 mag deeper than 2MASS. Our study covers the relatively unexplored negative longitudes of the Galactic bar. We obtain a detailed description of the spatial distribution of star counts towards the long Galactic bar as well as to measure its parameters. Methods. We performed star counts towards -20 degrees < l < 0, vertical bar b vertical bar < 2 degrees using VVV, 2MASS, and GLIMPSE data. We applied an average interstellar extinction correction. We also adjusted latitudinal profiles to obtain the centroid variation and bar thickness. Results. We probe the structure of long Galactic bar, as well as its far edge at l approximate to -14 degrees. The differences between counts with and without extinction correction allow us to produce a crude extinction map showing regions with high extinction, mainly beyond the end of long Galactic bar. The latitudinal profiles show evidence of the centroid vertical variation with Galactic longitude reaching a minimum at l approximate to -13.8 degrees. The bar has an inclination angle alpha = 43 degrees +/- 5 degrees with respect to the line Sun-Galactic center. In addition, we have determined the bar parameters, such as thickness, length, and stellar distribution. (AU)

Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
Beneficiário:Elisabete Maria de Gouveia Dal Pino
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários