Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey

Javier Alonso-García, Dante Minniti, Márcio Catelan, Rodrigo Contreras Ramos, Oscar A. Gonzalez, Maren Hempel, Philip W. Lucas, Roberto K. Saito, Elena Valenti, Manuela Zoccali

Resultado de la investigación: Contribución a una revistaArtículo de revisión

28 Citas (Scopus)

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.

Idioma originalInglés
Número de artículoL13
PublicaciónAstrophysical Journal Letters
Volumen849
N.º1
DOI
EstadoPublicada - 1 nov 2017

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

Huella Profundice en los temas de investigación de 'Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey'. En conjunto forman una huella única.

  • Citar esto

    Alonso-García, J., Minniti, D., Catelan, M., Contreras Ramos, R., Gonzalez, O. A., Hempel, M., Lucas, P. W., Saito, R. K., Valenti, E., & Zoccali, M. (2017). Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey. Astrophysical Journal Letters, 849(1), [L13]. https://doi.org/10.3847/2041-8213/aa92c3