Extinction ratios in the inner Galaxy as revealed by the VVV survey
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Archivos
Fecha
2017-11
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Institute of Physics Publishing
Nombre de Curso
Licencia CC
Licencia CC
Resumen
Interstellar extinction toward the Galactic Center (GC) is large and significantly differential. Its reddening and dimming effects in red clump (RC) stars in the Galactic Bulge can be exploited to better constrain the extinction law toward the innermost Galaxy. By virtue of a deep and complete catalog of more than 30 million objects at |l| ≤ 2°.7 and |b| ≤ 1°.55 obtained from VVV survey observations, we apply the RC method to infer the selective-to-total extinction ratios in the Z, Y, J, H, and Ks broadband near-infrared filters. The measured values are smaller than previously reported, and are not constant, with mean values of, e.g., AKS /E(J - Ks) = 0.428 ± 0.005 ± 0.04 and AKS/ E(H Ks) = 1.104 ± 0.022 ± 0.2. We also obtain a ratio AZ:AY:AJ:AH:AKS of 7.74:5.38:3.30:1.88:1.0, implying extinction toward the GC to follow a distribution as a function of wavelength steeper than previously reported, consistent with a power law Aλ ∝ λ -2.47 in the near-infrared.
Notas
Indexación: Scopus; Arxiv
Palabras clave
Dust, extinction, Galaxy: center, Infrared: ISM
Citación
Astrophysical Journal Letters, 849(1), art. no. L13.