J/A+A/631/A3 G202.3+2.5 position-position-velocity cubes (Montillaud+, 2019)
Multi-scale analysis of the Monoceros OB 1 star-forming region
II. Colliding filaments in the Monoceros OB1 molecular cloud.
Montillaud J., Juvela M., Vastel C., He J.H., Liu T., Ristorcelli I.,
Eden D.J., Kang S.-j., Kim K.-T., Koch P.M., Won Lee C., Rawlings M.G.,
Saajasto M., Sanhueza P., Soam A., Zahorecz S., Alina D., Boegner R.,
Cornu D., Doi Y., Malinen J., Marshall D., Micelotta E.R., Pelkonen V.M.,
Toth L.V., Traficante A., Wang K.
<Astron. Astrophys. 631, A3 (2019)>
=2019A&A...631A...3M 2019A&A...631A...3M (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; Molecular clouds
Keywords: ISM: clouds - star: formation
Abstract:
Current theories and models attempt to explain star formation
globally, from core scales to giant molecular cloud scales. A
multi-scale observational characterisation of an entire molecular
complex is necessary to constrain them. We investigate star formation
in G202.3+2.5, a ∼10x3pc sub-region of the Monoceros OB1 cloud with a
complex morphology harbouring interconnected filamentary structures.
We aim to connect the evolution of cores and filaments in G202.3+2.5
with the global evolution of the cloud and to identify the engines of
the cloud dynamics. In this first paper, the star formation activity
is evaluated by surveying the distributions of dense cores and
protostars, and their evolutionary state, as characterised using both
infrared observations from the Herschel and WISE telescopes and
molecular line observations with the IRAM 30-m telescope. We find
ongoing star formation in the whole cloud, with a local peak in star
formation activity around the centre of G202.3+2.5 where a chain of
massive cores (10-50M☉) forms a massive ridge (>150M☉).
All evolutionary stages from starless cores to Class II protostars are
found in G202.3+2.5, including a possibly starless, large column
density (8x1022cm-2), and massive (52M☉) core. All the
core-scale observables examined in this paper point to an enhanced
star formation activity centred on the junction between the three main
branches of the ramified structure of G202.3+2.5. This suggests that
the increased star-formation activity results from the convergence of
these branches. To further investigate the origin of this enhancement,
it is now necessary to extend the analysis to larger scales, in order
to examine the relationship between cores, filaments and their
environment. We address these points through the analysis of the
dynamics of G202.3+2.5 in a joint paper.
Description:
Data cubes obtained with the IRAM 30-m and TRAO 14-m telescopes for
G202.3+2.5 in the Monoceros OB 1 molecular complex. The cloud was
mapped in the "on-the-fly" mode with both telescopes. With the IRAM
30-m, the EMIR frontend was used in the 3mm band, with both VESPA and
FTS at spectral resolutions of ∼0.06km/s (20kHz) and ∼0.6km/s
(200kHz), respectively, and angular resolution of ∼25". VESPA data are
provided for 13CO and C18O. FTS are provided for 12CO, 13CO,
C18O, CS, C34S, and N2H+. With the TRAO 14-m telescope, the
SEQUOIA 4x4 array was used to observe 13CO (1-0). The provided cube
has a spectral resolution of 0.33km/s and an angular resolution of
∼50arcsec.
Objects:
------------------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------------------
06 41 08.47 +10 42 54.0 G202.3+2.5 = PGCC G202.23+02.61
------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 133 10 List of fits datacube
fits/* . 10 Individual fits datacubes
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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 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 F7.3 m/s dVRAD VRAD resolution
57- 61 F5.1 kHz dnu Frequency resolution
63- 68 I6 Kibyte size Size of FITS file
70- 94 A25 --- FileName Name of FITS file, in subdirectory fits
96-133 A38 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Julien Montillaud, julien(at)obs-besancon.fr,
UTINAM/Univ. B. Franche-Comte, France
References:
Montillaud et al., Paper I, 2019A&A...631L...1M 2019A&A...631L...1M
(End) J. Montillaud [UTINAM, Franche-Comte, France] P. Vannier [CDS] 12-Sep-2019