J/A+A/587/A47 SMA 1.3mm image of OMC 1 North (Teixeira+, 2016)
Two-level hierarchical fragmentation in the northern filament of the
Orion Molecular Cloud 1.
Teixeira P.S., Takahashi S., Zapata L.A., Ho P.T.P.
<Astron. Astrophys. 587, A47 (2016)>
=2016A&A...587A..47T 2016A&A...587A..47T (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Radio sources
Keywords: techniques: interferometric - stars: formation - ISM: clouds -
ISM: structure - stars: protostars - submillimeter: ISM
Abstract:
The filamentary structure of molecular clouds may set important
constraints on the mass distribution of stars forming within them. It
is therefore important to understand which physical mechanism
dominates filamentary cloud fragmentation and core formation.
Orion A is the nearest giant molecular cloud, and its so-called
S-shaped filament is a very active star-forming region that is a good
target for such a study. We have recently reported on the collapse and
fragmentation properties of the northernmost part of this structure,
located ∼2.4pc north of Orion KL - Orion Molecular Cloud (OMC) 3. As
part of our project to study the S-shaped filament, we analyze the
fragmentation properties of the northern OMC 1 filament (located
≲0.3pc north of Orion KL). This filament is a dense structure
previously identified by JCMT/SCUBA submillimeter continuum and VLA
NH3 observations and was shown to have fragmented into clumps. Our
aim is to search for cores and young protostars embedded within OMC 1n
and to study how the filament is fragmenting to form them.
We observed OMC 1North (hereafter OMC 1n) with the Submillimeter
Array (SMA) at 1.3mm and report on our analysis of the continuum
data.
Description:
We observed OMC 1n using the eight 6m antennas of the SMA1 in the
compact configuration on December 4, 20, and 24, 2008 (2007B-S028,
P.I.: L. Zapata) and in the subcompact configuration on February 1,
2009 (2008B-S072, P.I.: L. Zapata) at 230GHz. The primary beam at this
frequency is 55", and the nine pointing centers were distributed in a
Nyquist-sampled grid.
Objects:
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RA (2000) DE Designation(s)
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05 35 14.5 -05 22 07 OMC 1n = NAME OMC 1N
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 114 1 Informations of fits image
map.fits 2880 5426 Fits image
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 7 F7.4 deg RAdeg Lower value of right ascension interval (J2000)
9- 15 F7.4 deg B_RA Upper value of right ascension interval
17- 24 F8.5 deg DEdeg Lower value of declination interval (J2000)
26- 33 F8.5 deg B_DE Upper value of declination interval
35- 38 I4 --- Nx Number of pixels along X-axis
40- 43 I4 --- Ny Number of pixels along Y-axis
45- 65 A21 --- Obs.Date Observation date
67- 77 E11.6 m/s Vlsr LSR velocity
79- 83 I5 Kibyte size Size of FITS file
85- 92 A8 --- FileName Name of FITS file
94-114 A21 --- Title Title of the FITS file
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Acknowledgements:
Paula Teixeira, paula.teixeira(at)univie.ac.at
(End) Patricia Vannier [CDS] 24-Feb-2016