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The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 μm Using GLIMPSE Data


Indebetouw, R and Mathis, JS and Babler, BL and Meade, MR and Watson, C and Whitney, BA and Wolff, MJ and Wolfire, MG and Cohen, M and Bania, TM and Benjamin, RA and Clemens, DP and Dickey, JM and Jackson, JM and Kobulnicky, HA and Marston, AP and Mercer, EP and Stauffer, JR and Stolovy, SR and Churchwell, E, The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 μm Using GLIMPSE Data, The Astrophysical Journal, 619, (2 I) pp. 931-938. ISSN 0004-637X (2005) [Refereed Article]

DOI: doi:10.1086/426679


We determine and tabulate A [λ]/ A K, the wavelength dependence of interstellar extinction, in the Galactic plane for 1.25 μm ≤ λ ≤ 8.0 μm along two lines of sight: l = 42 and 284. The first is a relatively quiescent and unremarkable region; the second contains the giant H II region RCW 49, as well as a "field" region unrelated to the cluster and nebulosity. Areas near these Galactic longitudes were imaged at J, H, and K bands by 2MASS and at 3-8 μm by Spitzer for the GLIMPSE Legacy program. We measure the mean values of the color excess ratios (A [λ] - A K)/(A J - A K) directly from the color distributions of observed stars. The extinction ratio between two of the filters, e.g., A J/A K, is required to calculate A [λ]/A K from those measured ratios. We use the apparent JHK magnitudes of giant stars along our two sight lines and fit the reddening as a function of magnitude (distance) to determine A Jkpc -1, A K kpc -1, and A J/A K. Our values of A [λ]/A K show a flattening across the 3-8 μm wavelength range, roughly consistent with the extinction measurements derived by Lutz and coworkers for the sight line toward the Galactic center.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dickey, JM (Professor John Dickey)
ID Code:46599
Year Published:2005
Web of Science® Times Cited:617
Deposited By:Physics
Deposited On:2007-08-28
Last Modified:2012-04-20

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