J/MNRAS/449/1769 Orion A North prestellar core properties (Salji+, 2015)
The JCMT Gould Belt Survey: constraints on prestellar core properties in
Orion A North.
Salji C.J., Richer J.S., Buckle J.V., Hatchell J., Kirk H., Beaulieu S.F.,
Berry D.S., Broekhoven-Fiene H., Currie M.J., Fich M., Jenness T.,
Johnstone D., Mottram J.C., Nutter D., Pattle K., Pineda J.E., Quinn C.,
Tisi S., Walker-Smith S., Di Francesco J., Hogerheijde M.R.,
Ward-Thompson D., Bastien P., Butner H., Chen M., Chrysostomou A.,
Coude S., Davis C.J., Drabek-Maunder E., Duarte-Cabral A., Fiege J.,
Friberg P., Friesen R., Fuller G.A., Graves S., Greaves J., Gregson J.,
Holland W., Joncas G., Kirk J.M., Knee L.B.G., Mairs S., Marsh K.,
Matthews B.C., Moriarty-Schieven G., Rawlings J., Robertson D.,
Rosolowsky E., Rumble D., Sadavoy S., Thomas H., Tothill N., Viti S.,
White G.J., Wilson C.D., Wouterloot J., Yates J., Zhu M.
<Mon. Not. R. Astron. Soc., 449, 1769-1781 (2015)>
=2015MNRAS.449.1769S 2015MNRAS.449.1769S (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Stars, masses
Keywords: stars: formation - stars: protostars - submillimetre: ISM
Abstract:
We employ SCUBA-2 (Submillimetre Common-User Bolometer Array 2)
observations of the Orion A North molecular cloud to derive column
density and temperature maps. We apply a novel, Hessian-based
structural identification algorithm for detection of prestellar cores
to these data, allowing for automated generation of the prestellar
mass function. The resulting mass function is observed to peak at
1.39+0.18-0.19M☉, indicating a star-forming efficiency lower
limit of ∼14 per cent when compared with the Orion nebula Cluster
initial mass function (IMF) peak. Additionally, the prestellar mass
function is observed to decay with a high-mass power-law exponent
α=2.53+0.16-0.14, indicating approximate functional
similarity with the Salpeter IMF (α=2.35). This result, when
combined with the results of previous investigations suggests a
regional dependence of the star-forming efficiency.
Description:
Between 2011 November and 2013 October, a total of 23, ∼40min
observations at 850um and 450um were made of fully sampled 30 and
15 arcmin diameter circular regions using PONG1800 and 900 mapping
modes. All observations of Orion A North were conducted during grade 1
or 2 weather defined according to the opacity at 225GHz τ225<0.08
and were made under Project IDs MJLSG22 and MJLSG31.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
prestel.dat 116 210 *Prestellar cores and their properties catalogue
starless.dat 116 222 Starless cores and their properties catalogue
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Note on prestel.dat: Cores with masses exceeding MBE are considered as
'prestellar'.
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Byte-by-byte Description of file: prestel.dat starless.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Core ID (within the catalog)
5- 17 F13.10 deg RAdeg Right ascension (J2000.0)
19- 32 F14.11 deg DEdeg Declination (J2000.0)
34- 50 F17.12 Msun Mass Mass
52- 67 F16.13 Msun e_Mass rms uncertainty on Mass
69- 82 F14.11 K Temp Temperature
84- 99 F16.13 K e_Temp Temperature (1)
101-116 F16.14 pc Rad Deconvolved radius
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Note (1): Uncertainty is the standard deviation of temperature values within the
core boundary.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Nov-2015