VISION - Vienna Survey in Orion II. Infrared extinction in Orion A
Stefan Meingast, Jo\~ao Alves, and Marco Lombardi

TL;DR
This study investigates the infrared extinction law in Orion A, revealing spatial variations and challenges in modeling dust properties, and provides a high-resolution extinction map for future research.
Contribution
It offers the first detailed analysis of infrared extinction variations across Orion A using Bayesian methods and introduces a new high-resolution extinction map.
Findings
Infrared extinction in Orion A is flat in the mid-infrared.
Extinction law varies across the cloud, especially near the ONC.
Dust models do not fully match observed extinction curves.
Abstract
We have investigated the shape of the extinction curve in the infrared up to ~25 {\mu}m for the Orion A star-forming complex. The basis of this work is near-infrared data acquired with VISTA, in combination with Pan-STARRS and mid-infrared Spitzer photometry. We obtain colour excess ratios for eight passbands by fitting a series of colour-colour diagrams. The fits are performed using Markov chain Monte Carlo methods, together with a linear model under a Bayesian formalism. The resulting colour excess ratios are directly interpreted as a measure of the extinction law. We show that the Orion A molecular cloud is characterized by flat mid-infrared extinction, similar to many other recently studied sightlines. Moreover, we find statistically significant evidence that the extinction law from ~1 {\mu}m to at least ~6 {\mu}m varies across the cloud. In particular, we find a gradient along…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Advanced Combustion Engine Technologies
