Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center

By Shogo Nishiyama, T. Nagata, N. Kusakabe, N. Matsunaga, T. Naoi, D. Kato, C. Nagashima, K. Sugitani, Motohide Tamura, T. Tanabé and 1 more. 2006

190 citations recorded by the source corpus.

We have determined the ratios of total to selective extinction in the near-infrared bands (J,H,Ks) toward the Galactic center from the observations of the region ∣ l ∣ ≲ 2.°0 and 0.°5 ≲ ∣ b ∣ ≲ 1.°0 with the IRSF telescope and the SIRIUS camera. Using the positions of red clump stars in color-magnitude diagrams as a tracer of the extinction and reddening, we determine the average of the ratios of total to selective extinction to be A/E = 1.44 ± 0.01, A/E = 0.494 ± 0.006, and AH/EJ-H = 1.42 ± 0.02, which are significantly smaller than those obtained in previous studies. From these ratios, we estimate that AJ : AH : A = 1 : 0.573 ± 0.009 : 0.331 ± 0.004 and EJ-H/E = 1.72 ± 0.04, and we find that the power law Aλ ∝ λ-1.99±0.02 is a good approximation over these wavelengths. Moreover, we find a small variation in A/E across our survey. This suggests that the infrared extinction law changes from one line of sight to another, and the so-called universality does not necessarily hold in the infrared wavelengths.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/9a64bb519f288e101e574031f6a3ba910dabb22c

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Citations in the corpus

Modelling the Galactic Interstellar Extinction Distribution in Three Dimensions (2005, result): “However, this value is significantly different from Glass (1999) (AKs/AJ = 0.347), which is closer to the value recently measured by Nishiyama et al. (2006), AKs/AJ = 0.331, in their study of the Galactic bulge.”
Mapping the three-dimensional density of the galactic bulge with VVV red clump stars (2013, methodology): “(iii) That the extinction is given by the Nishiyama et al. (2006) extinction law.”
LINE DERIVED INFRARED EXTINCTION TOWARD THE GALACTIC CENTER (2011, methodology): “Nishiyama et al. (2006b) used red clump stars in the inner bulge to derive a photometric distance and obtained R0 = 7.52 ± 0.36 kpc.”
Dynamical modelling of the galactic bulge and bar: the Milky Way's pattern speed, stellar and dark matter mass distribution (2016, methodology): “For consistency with Wegg & Gerhard (2013), we adopt (J−Ks)RCG = 0.674 (Gonzalez et al. 2011) and AKsE(J−Ks) = 0.528 (Nishiyama et al. 2006).”
Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS II. The complete high resolution extinction map and implications for Galactic bulge studies (2012, background): “In particular, Nishiyama et al. (2006, 2008, 2009) presented a detailed study of the interstellar extinction law towards the inner regions of the GB (|l| < 2◦, |b| < 1.0◦), concluding that this varies significantly depending on the line of sight.”
POLARIZED FAR-INFRARED AND SUBMILLIMETER EMISSION FROM INTERSTELLAR DUST (2008, unknown): “…difficulty in determining the extinction per H nucleon when the H column density cannot be determined directly using Lyman-α absorption measurements.2 Nishiyama et al. (2006) find Aλ ∝ λ −1.99 for 1.25 ≤ λ ≤ 2.2 µm, steeper than the “observed” extinction used here, and closer to the behavior in…”
Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2 (2018, methodology): “We also added the gray component of the extinction curve b= 0.063, computed from AH/AK = 1.74 (Nishiyama et al. 2006) by Green et al. (2018), to our extinction values.”
Infrared Extinction toward Nearby Star-forming Regions (2007, methodology): “Nishiyama et al. (2006) measured the extinction law toward the galactic center using the same photometric system as Naoi et al. (2006) and their results are consistent with the reddening law being universal between the Galactic Center and the ρ Oph and Cha I star-forming regions.”
INTERSTELLAR EXTINCTION LAW TOWARD THE GALACTIC CENTER III: J, H, KS BANDS IN THE 2MASS AND THE MKO SYSTEMS, AND 3.6, 4.5, 5.8, 8.0 μm IN THE SPITZER/IRAC SYSTEM (2009, methodology): “To confirm that the current method using the RGB and RC stars in deriving the total-to-selective extinction ratios is consistent with the Nishiyama et al. (2006) method using only the RC stars, we reanalyzed the Nishiyama et al. (2006) data using the RGB and RC stars.”
REDDENING AND EXTINCTION TOWARD THE GALACTIC BULGE FROM OGLE-III: THE INNER MILKY WAY'S RV ∼ 2.5 EXTINCTION CURVE (2012, methodology): “It is also larger than distances derived from studies of the RC in the near-IR (Babusiaux & Gilmore 2005; Nishiyama et al. 2006).”
Peering through the veil: near-infrared photometry and extinction for the Galactic nuclear star cluster (2009, methodology): “Since RC stars can be found in large numbers toward the Galactic bulge and center, they are highly useful for studying Galactic extinction and structure (e.g., Wozniak & Stanek 1996; Udalski 2003; Sumi 2004; Nishiyama et al. 2005, 2006a,b).”
VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way (2009, result): “According to Nishiyama et al. (2006) and Gosling et al. (2009) a single extinction law is not consistent with the observations of the Galactic center along different lines of sight.”
An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-through-UV Curve Morphology (2007, background): “The issue of the universality of IR extinction is best left to indepth studies which utilize more focussed approaches and more appropriate datasets, such as by Larson & Whittet (2005) and Nishiyama et al. (2006), both of which have found a range in values for the IR exponent.”