Interstellar extinction in Orion. Variation of the strength of the UV bump across the complex

Abstract

There is growing observational evidence of dust coagulation in the dense filaments within molecular clouds. Infrared observations show that the dust grains size distribution gets shallower and the relative fraction of small to large dust grains decreases as the local density increases. Ultraviolet (UV) observations show that the strength of the 2175 Å feature, the so-called UV bump, also decreases with cloud density. In this work, we apply the technique developed for the Taurus study to the Orion molecular cloud and confirm that the UV bump decreases over the densest cores of the cloud as well as in the heavily UV irradiated λ Orionis shell. The study has been extended to the Rosette cloud with uncertain results given the distance (1.3 kpc).

9 pages, 6 figures

References in corpus (12)

• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• Gaia Data Release 1: Catalogue validation
• Herschel-Planck dust optical-depth and column-density maps: I. Method description and results for Orion
• Evolution of column density distributions within Orion~A
• A large scale extinction map of the Galactic Anticenter from 2MASS
• Allsky NICER and NICEST extinction maps based on the 2MASS near-infrared survey
• The magnetic diffusivities in 3D radiative chemo-hydrodynamic simulations of protostellar collapse
• A data base of synthetic photometry in the GALEX ultraviolet bands for the stellar sources observed with the International Ultraviolet Explorer
• Variation of the ultraviolet extinction law across the Taurus-Auriga star forming complex. A GALEX based study
• Young Stellar Object candidates toward the Orion region selected from GALEX

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• On the Use of Logistic Regression for stellar classification. An application to colour-colour diagrams
• Phase transition of three-dimensional finite-sized charged dust clusters in a plasma environment
• Formation of dust filaments in the diffuse envelopes of molecular clouds
• Ultraviolet extinction properties of the 30 Dor Nebula and interpreting observations of starburst clusters
• Dust growth in molecular cloud envelopes: a numerical approach
• Modelling the diffuse dust emission around Orion
• Signatures of diffuse interstellar gas in the Galaxy Evolution Explorer all sky survey