Spitzer's mid-infrared view on an outer Galaxy Infrared Dark Cloud candidate toward NGC 7538 - AstrophysicsReportar como inadecuado




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Abstract: Infrared Dark Clouds IRDCs represent the earliest observed stages ofclustered star formation, characterized by large column densities of cold anddense molecular material observed in silhouette against a bright background ofmid-IR emission. Up to now, IRDCs were predominantly known toward the innerGalaxy where background infrared emission levels are high. We present Spitzerobservations with the Infrared Camera Array toward object G111.80+0.58 G111in the outer Galactic Plane, located at a distance of ~3 kpc from us and ~10kpc from the Galactic center. Earlier results show that G111 is a massive, coldmolecular clump very similar to IRDCs. The mid-IR Spitzer observationsunambiguously detect object G111 in absorption. We have identified for thefirst time an IRDC in the outer Galaxy, which confirms the suggestion thatcluster-forming clumps are present throughout the Galactic Plane. However,against a low mid-IR back ground such as the outer Galaxy it takes some effortto find them.



Autor: W. F. Frieswijk, M. Spaans, R. F. Shipman, D. Teyssier, S. J. Carey, A. G. G. M. Tielens

Fuente: https://arxiv.org/







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