J/A+A/606/A123 Molecular maps of NGC1333 (Hacar+, 2017)
Fibers in the NGC1333 proto-cluster.
Hacar A., Tafalla M., Alves J.
<Astron. Astrophys. 606, A123 (2017)>
=2017A&A...606A.123H 2017A&A...606A.123H (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Molecular clouds ; Radio lines ;
Clusters, open
Keywords: ISM: clouds - ISM: kinematics and dynamics - ISM: structure -
Stars: formation - Submillimeter: ISM
Abstract:
Are the initial conditions for clustered star formation the same as
for non-clustered star formation? To investigate the initial gas
properties in young proto-clusters we carried out a comprehensive and
high-sensitivity study of the internal structure, density,
temperature, and kinematics of the dense gas content of the NGC1333
region in Perseus, one of the nearest and best studied embedded
clusters. The analysis of the gas velocities in the
Position-Position-Velocity space reveals an intricate underlying gas
organization both in space and velocity. We identified a total of 14
velocity-coherent, (tran-)sonic structures within NGC1333, with
similar physical and kinematic properties than those quiescent,
star-forming (aka fertile) fibers previously identified in low-mass
star-forming clouds. These fibers are arranged in a complex spatial
network, build-up the observed total column density, and contain the
dense cores and protostars in this cloud. Our results demonstrate that
the presence of fibers is not restricted to low-mass clouds but can be
extended to regions of increasing mass and complexity. We propose that
the observational dichotomy between clustered and non-clustered
star-forming regions might be naturally explained by the distinct
spatial density of fertile fibers in these environments.
Description:
Molecular observations in the NGC1333 proto-clusters:
- N2H+(1-0) IRAM30m observations (resolution=30 arcsec)
- NH3(1,1) Effelsberg100m observations (resolution=60 arcsec)
- NH3(2,2) Effelsberg100m observations (resolution=60 arcsec)
Data are provided in both FITS and CLASS formats.
Objects:
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RA (2000) DE Designation(s)
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03 28 55 +31 22.2 NGC1333 = NGC 1333
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 175 3 list of datacubes
fits/* . 3 Individudal datacubes in FITS
class/* . 3 Individudal datacubes in CLASS
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See also:
J/PAZh/27/403 : CCD R photometry in the UMa supercluster (Kopylova+, 2001)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 21 I2 --- Nx Number of pixels along X-axis
23- 25 I3 --- Ny Number of pixels along Y-axis
27- 30 I4 --- Nz Number of slices
32- 39 F8.1 m/s bVRAD Lower value of VRAD interval
41- 47 F7.1 m/s BVRAD Upper value of VRAD interval
49- 55 F7.4 m/s dVRAD Radial velocity resolution
57- 61 I5 Kibyte size Size of FITS file
63- 94 A32 --- FileName Name of FITS file, in subdirectory fits
96-150 A55 --- Title Title of the FITS file
152-175 A24 --- FileName2 Name of the CLASS file, in subdirectory class
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Acknowledgements:
Alvaro Hacar, hacar(at)strw.leidenuniv.nl
(End) Alvaro Hacar [Leiden obs., NL], Patricia Vannier [CDS] 24-Oct-2017