AzTEC 1.1mm observations of the MBM12 molecular cloud

M. J. Kim, S. Kim, S. Youn, M. S. Yun, G. W. Wilson, I. Aretxaga, J. P. Williams, D. H. Hughes, A. Humphrey, J. E. Austermann, T. A. Perera, P. D. Mauskopf, L. Magnani, Y. W. Kang

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2 Scopus citations

Abstract

We present 1.1mm observations of the dust continuum emission from the MBM12 high-latitude molecular cloud observed with the Astronomical Thermal Emission Camera (AzTEC) mounted on the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. We surveyed 6.34deg2 centered on MBM12, making this the largest area that has ever been surveyed in this region with submillimeter and millimeter telescopes. Eight secure individual sources were detected with a signal-to-noise ratio of over 4.4. These eight AzTEC sources can be considered to be real astronomical objects compared to the other candidates based on calculations of the false detection rate. The distribution of the detected 1.1mm sources or compact 1.1mm peaks is spatially anti-correlated with that of the 100 μm emission and the 12CO emission. We detected the 1.1mm dust continuum emitting sources associated with two classical T Tauri stars, LkHα262 and LkHα264. Observations of spectral energy distributions (SEDs) indicate that LkHα262 is likely to be ClassII (pre-main-sequence star), but there are also indications that it could be a late ClassI (protostar). A flared disk and a bipolar cavity in the models of ClassI sources lead to more complicated SEDs. From the present AzTEC observations of the MBM12 region, it appears that other sources detected with AzTEC are likely to be extragalactic and located behind MBM12. Some of these have radio counterparts and their star formation rates are derived from a fit of the SEDs to the photometric evolution of galaxies in which the effects of a dusty interstellar medium have been included.

Original languageEnglish (US)
Article number11
JournalAstrophysical Journal
Volume746
Issue number1
DOIs
StatePublished - Feb 10 2012

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Keywords

  • ISM: molecules
  • galaxies: high-redshift
  • stars: pre-main sequence
  • stars: protostars
  • submillimeter: galaxies
  • submillimeter: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, M. J., Kim, S., Youn, S., Yun, M. S., Wilson, G. W., Aretxaga, I., Williams, J. P., Hughes, D. H., Humphrey, A., Austermann, J. E., Perera, T. A., Mauskopf, P. D., Magnani, L., & Kang, Y. W. (2012). AzTEC 1.1mm observations of the MBM12 molecular cloud. Astrophysical Journal, 746(1), [11]. https://doi.org/10.1088/0004-637X/746/1/11