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: Review article

24 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 originalEnglish
Número de artículoL13
PublicaciónAstrophysical Journal Letters
Volumen849
N.º1
DOI
EstadoPublished - 1 nov 2017

Huella dactilar

extinction
clumps
galaxies
infrared filters
dimming
interstellar extinction
near infrared
galactic bulge
catalogs
broadband
stars
power law
filter
wavelength
wavelengths

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Alonso-García, J., Minniti, D., Catelan, M., Contreras Ramos, R., Gonzalez, O. A., Hempel, M., ... 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
Alonso-García, Javier ; Minniti, Dante ; Catelan, Márcio ; Contreras Ramos, Rodrigo ; Gonzalez, Oscar A. ; Hempel, Maren ; Lucas, Philip W. ; Saito, Roberto K. ; Valenti, Elena ; Zoccali, Manuela. / Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey. En: Astrophysical Journal Letters. 2017 ; Vol. 849, N.º 1.
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abstract = "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.",
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Alonso-García, J, Minniti, D, Catelan, M, Contreras Ramos, R, Gonzalez, OA, Hempel, M, Lucas, PW, Saito, RK, Valenti, E & Zoccali, M 2017, 'Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey', Astrophysical Journal Letters, vol. 849, n.º 1, L13. https://doi.org/10.3847/2041-8213/aa92c3

Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey. / Alonso-García, Javier; Minniti, Dante; Catelan, Márcio; Contreras Ramos, Rodrigo; Gonzalez, Oscar A.; Hempel, Maren; Lucas, Philip W.; Saito, Roberto K.; Valenti, Elena; Zoccali, Manuela.

En: Astrophysical Journal Letters, Vol. 849, N.º 1, L13, 01.11.2017.

Resultado de la investigación: Review article

TY - JOUR

T1 - Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey

AU - Alonso-García, Javier

AU - Minniti, Dante

AU - Catelan, Márcio

AU - Contreras Ramos, Rodrigo

AU - Gonzalez, Oscar A.

AU - Hempel, Maren

AU - Lucas, Philip W.

AU - Saito, Roberto K.

AU - Valenti, Elena

AU - Zoccali, Manuela

PY - 2017/11/1

Y1 - 2017/11/1

N2 - 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.

AB - 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.

KW - dust, extinction

KW - Galaxy: center

KW - infrared: ISM

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U2 - 10.3847/2041-8213/aa92c3

DO - 10.3847/2041-8213/aa92c3

M3 - Review article

AN - SCOPUS:85032735374

VL - 849

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 1

M1 - L13

ER -

Alonso-García J, Minniti D, Catelan M, Contreras Ramos R, Gonzalez OA, Hempel M y otros. Extinction Ratios in the Inner Galaxy as Revealed by the VVV Survey. Astrophysical Journal Letters. 2017 nov 1;849(1). L13. https://doi.org/10.3847/2041-8213/aa92c3