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The Spitzer Survey of Interstellar Clouds in the Gould Belt. V. Ophiuchus North Observed with IRAC and MIPS

Hatchell, J. and Terebey, S. and Huard, T. and Mamajek, E. E. and Allen, L. and Bourke, T. L. and Dunham, M. M. and Gutermuth, R. and Harvey, P. M. and Jørgensen, J. K. and Merín, B. and Noriega-Crespo, A. and Peterson, D. E. (2012) The Spitzer Survey of Interstellar Clouds in the Gould Belt. V. Ophiuchus North Observed with IRAC and MIPS. Astrophysical Journal, 754 (2). Art. No. 104. ISSN 0004-637X.

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We present Spitzer IRAC (2.1 deg^2) and MIPS (6.5 deg^2) observations of star formation in the Ophiuchus North (Oph N) molecular clouds. This fragmentary cloud complex lies on the edge of the Sco-Cen OB association, several degrees to the north of the well-known ρ Oph star-forming region, at an approximate distance of 130 pc. The Oph N clouds were mapped as part of the Spitzer Gould Belt project under the working name "Scorpius." In the regions mapped, selected to encompass all the cloud with visual extinction A_V > 3, 11 young stellar object (YSO) candidates are identified, 8 from IRAC/MIPS color-based selection and 3 from Two Micron All Sky Survey (2MASS) K_S /MIPS colors. Adding to one source previously identified in L43, this increases the number of YSOcs identified in Oph N to 12. During the selection process, four color-based YSOcs were rejected as probable asymptotic giant branch stars and one as a known galaxy. The sources span the full range of YSOc classifications from Class 0/1 to Class III, and starless cores are also present. Twelve high extinction (A_V > 10) cores are identified with a total mass of ~100 M_☉. These results confirm that there is little ongoing star formation in this region (instantaneous star formation efficiency <0.34%) and that the bottleneck lies in the formation of dense cores. The influence of the nearby Upper Sco OB association, including the 09V star ζ Oph, is seen in dynamical interactions and raised dust temperatures but has not enhanced levels of star formation in Oph N.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hatchell, J.0000-0002-4870-2760
Mamajek, E. E.0000-0003-2008-1488
Dunham, M. M.0000-0003-0749-9505
Gutermuth, R.0000-0002-6447-899X
Jørgensen, J. K.0000-0001-9133-8047
Noriega-Crespo, A.0000-0002-6296-8960
Additional Information:© 2012 American Astronomical Society. Received 2011 November 2; accepted 2012 May 27; published 2012 July 13. We thank the anonymous referee for constructive suggestions. S.T. thanks Deborah Padgett for help with the WISE data. J.H. acknowledges support from the STFC Advanced Fellowship program. E.E.M. acknowledges support from the NSF award AST-1008908. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France; the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration; and data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles; and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:circumstellar matter; infrared: stars; stars: evolution; stars: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20120904-084937689
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Official Citation:The Spitzer Survey of Interstellar Clouds in the Gould Belt. V. Ophiuchus North Observed with IRAC and MIPS J. Hatchell et al. 2012 ApJ 754 104
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33813
Deposited By: Jason Perez
Deposited On:06 Sep 2012 21:12
Last Modified:09 Mar 2020 13:18

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