J/A+A/630/A69 Radio observations of G074.11+00.11 (Saajasto+, 2019)
Cloud G074.11+00.11: a stellar cluster in formation.
Saajasto M., Harju J., Juvela M., Tie L., Zhang Q., Liu S.-Y., Hirano N.,
Wu Y., Kim K.-T., Tatematsu K., Wang K., Thompson M.
<Astron. Astrophys. 630, A69 (2019)>
=2019A&A...630A..69S 2019A&A...630A..69S (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Radio sources ; Molecular clouds
Keywords: ISM: clouds - ISM: kinematics and dynamics - ISM: structure
Abstract:
We present molecular line and dust continuum observations of a
Planck-detected cold cloud, G074.11+00.11. The cloud consists of a
system of curved filaments and a central star-forming clump. The clump
is associated with several infrared sources and H2O maser emission.
We aim to determine the mass distribution and gas dynamics within the
clump, to investigate if the filamentary structure seen around the
clump repeats itself on a smaller scale, and to estimate the fractions
of mass contained in dense cores and filaments. The velocity
distribution of pristine dense gas can be used to investigate the
global dynamical state of the clump, the role of filamentary inflows,
filament fragmentation and core accretion. We use molecular line and
continuum observations from single dish observatories and
interferometry facilities to study the kinematics of the region. The
molecular line observations show that the central clump may have
formed as a result of a large-scale filament collision. The central
clump contains three compact cores. Assuming a distance of 2.3kpc,
based on Gaia observations and a three-dimensional extinction method
of background stars, the mass of the central clump exceeds 700 solar
masses, which is roughly 25% of the total mass of the cloud. Our
virial analysis suggests that the central clump and all identified
substructures are collapsing. We find no evidence for small-scale
filaments associated with the cores. Our observations indicate that
the clump is fragmented into three cores with masses in the range of
[10,50] solar masses and that all three are collapsing. The presence
of an H2O maser emission suggests active star formation. However the
CO lines show only weak signs of outflows. We suggest that the region
is young and any processes leading to star formation have just
recently begun.
Description:
This catalogue contains the radio observations of a cold clump
G074.11+00.11. The catalogue contains all of the observed molecular
lines, however, please note that not all of the observed molecules
were detected. The included data has been obtained from several
telescopes: Purple Mountain Observatory (PMO), Korean Very Long
Baseline Interferometry Network (KVN), the Submillimeter Telescope
(SMT), and the Submillimeter Array (SMA). For a more detailed
description of the data, velocity resolutions etc. please see the
Section 2, Observations of the main paper and the references therein.
Objects:
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RA (2000) DE Designation(s)
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20 17 58.5 +35 56 15 G074.11+00.11 = PLCKECC G074.11+00.11
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ch3oh_1.dat 26 4096 KVN CH3OH line from position 1
ch3oh_2.dat 26 4096 KVN CH3OH line from position 2
h2co_1.dat 26 4096 KVN H2CO line from position 1
h2co_2.dat 26 4096 KVN H2CO line from position 2
h2co_3.dat 26 4096 KVN H2CO line from position 3
h2co_4.dat 26 4096 KVN H2CO line from position 4
h2co_5.dat 26 4096 KVN H2CO line from position 5
h2co_6.dat 26 4096 KVN H2CO line from position 6
h2co_7.dat 26 4096 KVN H2CO line from position 7
h2co_8.dat 26 4096 KVN H2CO line from position 8
h2co_9.dat 26 4096 KVN H2CO line from position 9
h2o_1.dat 26 4096 KVN H2O line from position 1
h2o_2.dat 26 4096 KVN H2O line from position 2
n2h_1.dat 26 4096 KVN N2H+ line from position 1
n2h_2.dat 26 4096 KVN N2H+ line from position 2
n2h_3.dat 26 4096 KVN N2H+ line from position 3
n2h_4.dat 26 4096 KVN N2H+ line from position 4
n2h_5.dat 26 4096 KVN N2H+ line from position 5
n2h_6.dat 26 4096 KVN N2H+ line from position 6
n2h_7.dat 26 4096 KVN N2H+ line from position 7
n2h_8.dat 26 4096 KVN N2H+ line from position 8
n2h_9.dat 26 4096 KVN N2H+ line from position 9
list.dat 128 7 List of fits datacubes
fits/* . 7 Individual fits datacubes
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Byte-by-byte Description of file: [chn]*.dat
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Bytes Format Units Label Explanations
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1- 14 E14.7 km/s Vel Velocity
16- 26 E11.5 K Tmb Mean beam temperature
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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- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 30 I3 --- Nz Number of pixels along Z-axis
32- 57 A26 "datime" Obs.date Observation date
59- 66 F8.1 m/s bVel Lower value of velocity interval
68- 74 F7.1 m/s BVel Upper value of velocity interval
76- 82 F7.3 m/s dVel Velocity resolution
84- 88 I5 Kibyte size Size of FITS file
90-101 A12 --- FileName Name of FITS file, in subdirectory fits
103-128 A26 --- Title Title of the FITS file
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Acknowledgements:
Mika Saajasto, mika.saajasto(at)helsinki.fi
(End) Mika Saajasto [Univ. Helsinki, Finland] Patricia Vannier [CDS] 22-Jul-2019