Forskning ved Københavns Universitet - Københavns Universitet

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The Spitzer survey of interstellar clouds in the gould belt. I. IC 5146 observed with IRAC and MIPS

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  • Paul M. Harvey
  • Tracy L. Huard
  • Jørgensen, Jes Kristian
  • Robert A. Gutermuth
  • Eric E. Mamajek
  • Tyler L. Bourke
  • Bruno Merín
  • Lucas Cieza
  • Tim Brooke
  • Nicholas Chapman
  • Juan M. Alcalá
  • Lori E. Allen
  • Neal J. Evans
  • James Di Francesco
  • Jason M. Kirk

We present observations of two areas totalling 0.57 deg2 in the IC 5146 star-forming region at 3.6, 4.5, 5.8, 8.0, 24, and 70 μm observed with the Spitzer Space Telescope. We reexamine the issue of the distance to this cloud and conclude a value of 950 ± 80 pc is most likely. We co t colors, d magnitudes in our observed region to a subset of the SWIRE data that was processed through our pipeline. We identify more than 200 young stellar object (YSO) candidates from color-magnitude and color-color diagrams, many of which were previously unknown. We compare the colors of these YSOs to the models of Robitaille et al. and perform simple fits to the SED's to estimate properties of the circum.stellar disks likely to surround the Class II and III sources. We also compare the mid-IR disk excesses to Ha emission-line data where available. We present a quantitative description of the degree of clustering, estimate the star formation efficiency, and discuss the fraction of YSOs in the region with disks relative to an estimate of the diskless YSO population. Finally, we compare the YSO distribution to the cold dust distribution mapped by SCUBA and briefly describe the diffuse emission likely due to PAHs associated with the H II region.

OriginalsprogEngelsk
TidsskriftAstrophysical Journal
Vol/bind680
Udgave nummer1
Sider (fra-til)495-516
Antal sider22
ISSN0004-637X
DOI
StatusUdgivet - 10 jun. 2008
Eksternt udgivetJa

ID: 229739787