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

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dc.creatorIndebetouw, R.
dc.creatorMathis, J. S.
dc.creatorBabler, B. L.
dc.creatorMeade, M. R.
dc.creatorWatson, C.
dc.creatorWhitney, B. A.
dc.creatorWolff, M. J.
dc.creatorWolfire, M. G.
dc.creatorBania, T. M.
dc.creatorBenjamin, R. A.
dc.creatorClemens, D. P.
dc.creatorCohen, Martin
dc.creatorDickey, J. M.
dc.creatorJackson, J. M.
dc.creatorKobulnicky, H. A.
dc.creatorMarston, A. P.
dc.creatorMercer, E. P.
dc.creatorStauffer, J. R.
dc.creatorStolovy, S. R.
dc.creatorChurchwell, E.
dc.date2004-06-17
dc.date2004-10-28
dc.date.accessioned2026-07-07T10:27:14Z
dc.date.available2026-07-07T10:27:14Z
dc.descriptionWe determine and tabulate A(lambda)/A(K), the wavelength dependence of interstellar extinction, in the Galactic plane for 1.25um<lambda<8.0um along two lines of sight: l~42 and l~284. The first is a relatively quiescent and unremarkable region; the second contains the giant HII 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--8um by Spitzer for the GLIMPSE Legacy program. We measure the mean values of the color excess ratios (A(lambda)-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(lambda)/A(K) from those measured ratios. We use the apparent JHK magnitudes of giant stars along our two sightlines, and fit the reddening as a function of magnitude (distance) to determine A(J)/kpc, A(K)/kpc, and A(J)/A(K). Our values of A(lambda)/A(K) show a flattening across the 3--8um wavelength range, roughly consistent with the Lutz 1996 extinction measurements derived for the sightline toward the Galactic center.
dc.description20pp, 6fig, accepted version: description of the method has been revised, results are unchanged, discussion of implications slightly expanded
dc.identifierhttps://arxiv.org/abs/astro-ph/0406403
dc.identifierhttp://arxiv.org/abs/astro-ph/0406403
dc.identifierAstrophys.J.619:931-938,2005
dc.identifierdoi:10.1086/426679
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177093
dc.subjectAstrophysics
dc.titleThe Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
dc.typetext

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