Three-dimensional interstellar extinction map toward the Galactic bulge

B. Q. Chen, M. Schultheis, B. W. Jiang, O. A. Gonzalez, A. C. Robin, M. Rejkuba, D. Minniti

Resultado de la investigación: Article

28 Citas (Scopus)

Resumen

Context. Studies of the properties of the inner Galactic bulge strongly depend on the assumptions made about interstellar extinction. Most of the extinction maps available in the literature lack the information about the distance. Aims. We combine observations with the Besançon model of the Galaxy to investigate the variations of extinction along different lines of sight toward the inner Galactic bulge as a function of distance. In addition we study the variations in the extinction law in the bulge. Methods. We constructed color-magnitude diagrams with the following sets of colors: H-Ks and J-Ks from the VVV catalog and Ks-[3.6], Ks-[4.5], Ks-[5.8] and Ks-[8.0] from GLIMPSE-II catalog matched with 2MASS. Using the newly derived temperature-color relation for M giants that match the observed color-magnitude diagrams better we then used the distance-color relations to derive the extinction as a function of distance. The observed colors were shifted to match the intrinsic colors in the Besançon model as a function of distance, thereby iteratively creating an extinction map with three dimensions: two spatial and one distance dimension along each line of sight toward the bulge. Results. Color excess maps are presented at a resolution of 15′ × 15′ for six different combinations of colors in distance bins of 1 kpc. The high resolution and depth of the photometry allows us to derive extinction maps to 10 kpc distance and up to 35 mag of extinction in AV (3.5 mag in AKs). Integrated maps show the same dust features and consistent values with the other 2D maps. Starting from the color excess between the observations and the model, we investigate the extinction law in near-infrared and its variation along different lines of sight.

Idioma originalEnglish
Número de artículoA42
PublicaciónAstronomy and Astrophysics
Volumen550
DOI
EstadoPublished - 28 ene 2013

Huella dactilar

interstellar extinction
galactic bulge
extinction
color
line of sight
color-magnitude diagram
catalogs
diagram
photometry
dust
galaxies
near infrared
high resolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Chen, B. Q., Schultheis, M., Jiang, B. W., Gonzalez, O. A., Robin, A. C., Rejkuba, M., & Minniti, D. (2013). Three-dimensional interstellar extinction map toward the Galactic bulge. Astronomy and Astrophysics, 550, [A42]. https://doi.org/10.1051/0004-6361/201219682
Chen, B. Q. ; Schultheis, M. ; Jiang, B. W. ; Gonzalez, O. A. ; Robin, A. C. ; Rejkuba, M. ; Minniti, D. / Three-dimensional interstellar extinction map toward the Galactic bulge. En: Astronomy and Astrophysics. 2013 ; Vol. 550.
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title = "Three-dimensional interstellar extinction map toward the Galactic bulge",
abstract = "Context. Studies of the properties of the inner Galactic bulge strongly depend on the assumptions made about interstellar extinction. Most of the extinction maps available in the literature lack the information about the distance. Aims. We combine observations with the Besan{\cc}on model of the Galaxy to investigate the variations of extinction along different lines of sight toward the inner Galactic bulge as a function of distance. In addition we study the variations in the extinction law in the bulge. Methods. We constructed color-magnitude diagrams with the following sets of colors: H-Ks and J-Ks from the VVV catalog and Ks-[3.6], Ks-[4.5], Ks-[5.8] and Ks-[8.0] from GLIMPSE-II catalog matched with 2MASS. Using the newly derived temperature-color relation for M giants that match the observed color-magnitude diagrams better we then used the distance-color relations to derive the extinction as a function of distance. The observed colors were shifted to match the intrinsic colors in the Besan{\cc}on model as a function of distance, thereby iteratively creating an extinction map with three dimensions: two spatial and one distance dimension along each line of sight toward the bulge. Results. Color excess maps are presented at a resolution of 15′ × 15′ for six different combinations of colors in distance bins of 1 kpc. The high resolution and depth of the photometry allows us to derive extinction maps to 10 kpc distance and up to 35 mag of extinction in AV (3.5 mag in AKs). Integrated maps show the same dust features and consistent values with the other 2D maps. Starting from the color excess between the observations and the model, we investigate the extinction law in near-infrared and its variation along different lines of sight.",
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Three-dimensional interstellar extinction map toward the Galactic bulge. / Chen, B. Q.; Schultheis, M.; Jiang, B. W.; Gonzalez, O. A.; Robin, A. C.; Rejkuba, M.; Minniti, D.

En: Astronomy and Astrophysics, Vol. 550, A42, 28.01.2013.

Resultado de la investigación: Article

TY - JOUR

T1 - Three-dimensional interstellar extinction map toward the Galactic bulge

AU - Chen, B. Q.

AU - Schultheis, M.

AU - Jiang, B. W.

AU - Gonzalez, O. A.

AU - Robin, A. C.

AU - Rejkuba, M.

AU - Minniti, D.

PY - 2013/1/28

Y1 - 2013/1/28

N2 - Context. Studies of the properties of the inner Galactic bulge strongly depend on the assumptions made about interstellar extinction. Most of the extinction maps available in the literature lack the information about the distance. Aims. We combine observations with the Besançon model of the Galaxy to investigate the variations of extinction along different lines of sight toward the inner Galactic bulge as a function of distance. In addition we study the variations in the extinction law in the bulge. Methods. We constructed color-magnitude diagrams with the following sets of colors: H-Ks and J-Ks from the VVV catalog and Ks-[3.6], Ks-[4.5], Ks-[5.8] and Ks-[8.0] from GLIMPSE-II catalog matched with 2MASS. Using the newly derived temperature-color relation for M giants that match the observed color-magnitude diagrams better we then used the distance-color relations to derive the extinction as a function of distance. The observed colors were shifted to match the intrinsic colors in the Besançon model as a function of distance, thereby iteratively creating an extinction map with three dimensions: two spatial and one distance dimension along each line of sight toward the bulge. Results. Color excess maps are presented at a resolution of 15′ × 15′ for six different combinations of colors in distance bins of 1 kpc. The high resolution and depth of the photometry allows us to derive extinction maps to 10 kpc distance and up to 35 mag of extinction in AV (3.5 mag in AKs). Integrated maps show the same dust features and consistent values with the other 2D maps. Starting from the color excess between the observations and the model, we investigate the extinction law in near-infrared and its variation along different lines of sight.

AB - Context. Studies of the properties of the inner Galactic bulge strongly depend on the assumptions made about interstellar extinction. Most of the extinction maps available in the literature lack the information about the distance. Aims. We combine observations with the Besançon model of the Galaxy to investigate the variations of extinction along different lines of sight toward the inner Galactic bulge as a function of distance. In addition we study the variations in the extinction law in the bulge. Methods. We constructed color-magnitude diagrams with the following sets of colors: H-Ks and J-Ks from the VVV catalog and Ks-[3.6], Ks-[4.5], Ks-[5.8] and Ks-[8.0] from GLIMPSE-II catalog matched with 2MASS. Using the newly derived temperature-color relation for M giants that match the observed color-magnitude diagrams better we then used the distance-color relations to derive the extinction as a function of distance. The observed colors were shifted to match the intrinsic colors in the Besançon model as a function of distance, thereby iteratively creating an extinction map with three dimensions: two spatial and one distance dimension along each line of sight toward the bulge. Results. Color excess maps are presented at a resolution of 15′ × 15′ for six different combinations of colors in distance bins of 1 kpc. The high resolution and depth of the photometry allows us to derive extinction maps to 10 kpc distance and up to 35 mag of extinction in AV (3.5 mag in AKs). Integrated maps show the same dust features and consistent values with the other 2D maps. Starting from the color excess between the observations and the model, we investigate the extinction law in near-infrared and its variation along different lines of sight.

KW - Dust, extinction

KW - Galaxy: bulge

KW - Galaxy: stellar content

KW - Galaxy: structure

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U2 - 10.1051/0004-6361/201219682

DO - 10.1051/0004-6361/201219682

M3 - Article

AN - SCOPUS:84872726533

VL - 550

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A42

ER -

Chen BQ, Schultheis M, Jiang BW, Gonzalez OA, Robin AC, Rejkuba M y otros. Three-dimensional interstellar extinction map toward the Galactic bulge. Astronomy and Astrophysics. 2013 ene 28;550. A42. https://doi.org/10.1051/0004-6361/201219682