J/ApJS/209/39 CO survey of molecular clouds. III. Serpens (Burleigh+, 2013)
The Arizona Radio Observatory CO mapping survey of galactic molecular clouds.
III. The Serpens cloud in CO J = 2-1 and 13CO J = 2-1 emission.
Burleigh K.J., Bieging J.H., Chromey A., Kulesa C., Peters W.L.
<Astrophys. J. Suppl. Ser., 209, 39 (2013)>
=2013ApJS..209...39B 2013ApJS..209...39B
ADC_Keywords: Molecular clouds ; Radio lines ; Interstellar medium ; Surveys
Keywords: ISM: clouds ; ISM: individual: Serpens cloud;
ISM: kinematics and dynamics; ISM: molecules
Abstract:
We mapped 12CO and 13CO J=2-1 emission over 1.04deg2 of the
Serpens molecular cloud with 38" spatial and 0.3km/s spectral
resolution using the Arizona Radio Observatory Heinrich Hertz
Submillimeter Telescope. Our maps resolve kinematic properties for the
entire Serpens cloud. We also compare our velocity moment maps with
known positions of young stellar objects (YSOs) and 1.1 mm continuum
emission. We find that 12CO is self-absorbed and 13CO is optically
thick in the Serpens core. Outside of the Serpens core, gas appears in
filamentary structures having LSR velocities which are blueshifted by
up to 2km/s relative to the 8km/s systemic velocity of the Serpens
cloud. We show that the known Class I, flat, and Class II YSOs in the
Serpens core most likely formed at the same spatial location and have
since drifted apart. The spatial and velocity structure of the 12CO
line ratios implies that a detailed three-dimensional radiative
transfer model of the cloud will be necessary for full interpretation
of our spectral data. The "starless cores" region of the cloud is
likely to be the next site of star formation in Serpens.
Description:
We mapped about 1.04deg2 of Serpens Main in the 12CO (230.5GHz)
and 13CO (220.4GHz), J=2-1, emission lines (see Figure 1). This
study is a continuation of a molecular cloud mapping project with the
Arizona Radio Observatory.
The observations were made between 2008 November and 2010 June with
the Heinrich Hertz Submillimeter Telescope (HHT) on Mt. Graham, AZ, at
an elevation of 3200m. The HHT has a 10m diameter paraboloidal dish
and observes in the frequency range from 210 to 500GHz.
Objects:
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RA (2000) DE Designation(s)
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18 29 49 +01 14.8 Serpens Main = NAME SERPENS CLOUD
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 87 2 List of the calibrated brightness temperature
image cubes of 12CO and 13CO J=2-1
fits/* . 2 FITS maps
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See also:
J/ApJS/196/18 : CO survey of galactic molecular clouds. II. (Bieging+, 2011)
J/ApJS/191/232 : CO survey of W51 molecular cloud. I. (Bieging+, 2010)
J/A+A/519/A27 : CO maps in Serpens (Duarte-Cabral+, 2010)
J/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)
J/ApJ/684/1240 : Prestellar cores in Perseus, Serpens & Oph. (Enoch+, 2008)
J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Title Title of the file
26- 30 F5.1 GHz Band [220/231] Observed band in GHz
32- 40 F9.5 deg RAdeg Right ascension of center (J2000)
41- 49 F9.5 deg DEdeg Declination of center (J2000)
51- 53 I3 pix Nx [305] Number of pixels along X-axis (RA-GLS)
54 A1 --- --- [x]
55- 57 I3 pix Ny [721] Number of pixels along Y-axis (DEC-GLS)
58 A1 --- --- [x]
59- 61 I3 pix Nz [133] Number of pixels along Z-axis (VELOCITY)
63- 64 I2 arcsec/pix Scale [10] Scale of the image
66- 71 I6 m/s Velmin Minimum velocity value
73- 77 I5 m/s Velmax Maximum velocity value
79- 87 A9 --- FileName Name of the FITS file in subdirectory fits
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History:
From electronic version of the journal
References:
Bieging et al. Paper I: W51 2010ApJS..191..232B 2010ApJS..191..232B Cat J/ApJS/191/232
Bieging et al. Paper II: W3 2011ApJS..196...18B 2011ApJS..196...18B Cat. J/ApJS/196/18
Bieging et al. Paper IV: NGC 1333 2014ApJS..214....7B 2014ApJS..214....7B Cat. J/ApJS/214/7
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 03-Feb-2014