title: AzTEC 1.1 mm Observations of the MBM12 Molecular Cloud

authors: 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


abstract: We present 1.1 mm 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 (JCMT) on Mauna
Kea, Hawaii. We surveyed a 6.34 deg$^2$ centered on MBM12, making this the
largest area that has ever been surveyed in this region with submillimeter and
millimeter telescope. Eight secure individual sources were detected with over
4.4 signal-to-noise ratio. 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 (FDR). The distribution of the
detected 1.1 mm sources or compact 1.1 mm peaks is spatially anti-correlated
with that of the 100 $\mu$m emission and the $^{12}$CO emission. We detected the 
1.1 mm dust continuum emitting sources associated with two classical T
Tauri stars, LkH$\alpha$262 and LkH$\alpha$264. Observations of spectral
energy distributions (SEDs) indicate that LkH$\alpha$262 is likely to be Class
II (pre-main sequence star), but there are also indications that it could be a
late Class I (protostar). A flared disk and a bipolar cavity in the models of
Class I 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 (SFRs) 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. We are grateful to 
the AzTEC team members. The James Clerk Maxwell Telescope is operated by the 
Joint Astronomy Center on behalf of the Science and Technology Facilities Council 
of the United Kingdom, the Netherlands Organization for Scientific Research, and 
the National Research Council of Canada. This work was supported in part by Mid-career 
Researcher Program through the National Research Foundation of Korea (NRF) funded 
by the Ministry of Education, Science and Technology 2011-0028001.