J/A+A/629/A10 IRAS23033+5951 continuum & line data cubes at 1.3mm (Bosco+, 2019)
Fragmentation, rotation and outflows in the high-mass star-forming region
IRAS 23033+5951. A case study of the IRAM NOEMA large program CORE.
Bosco F., Beuther H., Ahmadi A., Mottram J.C., Kuiper R., Linz H.,
Maud L.T., Winters J.M., Henning T., Feng S., Peters T., Semenov D.,
Klaassen P.D., Schilke P., Urquhart J.S., Beltran M.T., Lumsden S.L.,
Leurini S., Moscadelli L., Cesaroni R., Sanchez-Monge A., Palau A.,
Pudritz R., Wyrowski F., Longmore S.
<Astron. Astrophys. 629, A10 (2019)>
=2019A&A...629A..10B 2019A&A...629A..10B (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Millimetric/submm sources
Keywords: ISM: individual objects: IRAS 23033+5951 -
ISM: kinematics and dynamics - ISM: jets and outflows -
circumstellar matter - stars: formation - stars: massive
Abstract:
The formation process of high-mass stars (>8M☉) is poorly
constrained, particularly, the effects of clump fragmentation creating
multiple systems and the mechanism of mass accretion onto the cores.
We study the fragmentation of dense gas clumps, and trace the
circumstellar rotation and outflows by analyzing observations of the
high-mass (∼500M☉) star-forming region IRAS 23033+5951.
Using the Northern Extended Millimeter Array (NOEMA) in three
configurations and the IRAM 30-m single-dish telescope at 220GHz, we
probe the gas and dust emission at an angular resolution of ∼0.45",
corresponding to 1900au.
In the mm continuum emission, we identify a protostellar cluster with
at least four mm-sources, where three of them show a significantly
higher peak intensity well above a signal-to-noise ratio of 100.
Hierarchical fragmentation from large to small spatial scales is
discussed. Two fragments are embedded in rotating structures and drive
molecular outflows, traced by 13CO (2-1) emission. The velocity
profiles across two of the cores are similar to Keplerian but are
missing the highest velocity components close to the center of
rotation, which is a common phenomena from observations like these,
and other rotation scenarios are not excluded entirely.
Position-velocity diagrams suggest protostellar masses of ∼6 and
19M_☉. Rotational temperatures from fitting CH3CN (12K-11K)
spectra are used for estimating the gas temperature and by that the
disk stability against gravitational fragmentation, utilizing Toomre's
Q parameter. Assuming that the candidate disk is in Keplerian rotation
about the central stellar object and considering different disk
inclination angles, we identify only one candidate disk to be unstable
against gravitational instability caused by axisymmetric
perturbations.
The dominant sources cover different evolutionary stages within the
same maternal gas clump. The appearance of rotation and outflows of
the cores are similar to those found in low-mass star-forming regions.
Description:
Interferometric observations carried out between 2014-2016 with the
NOrthern Extended Millimeter Array (NOEMA) towards the high-mass star
forming region IRAS23033+5951. The FITS files include the continuum
emission at 1.37mm (220GHz), and data cubes of the lines observed
with the Narrowband and WideX receivers with ∼0.4km/s and ∼2.7km/s
resolution, respectively. The data cube of merged NOEMA and 30-m
observations of 13CO as presented in the paper.
Objects:
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RA (2000) DE Designation(s)
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23 05 25.17 +60 08 11.5 IRAS 23033+5951 = IRCO 834
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 261 10 Description of FITS files
fits/* . 10 Indifidual fits files
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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- 24 F5.3 arcsec/pix Scale [0.074] Scale of the image
26- 29 I4 --- Nx [403/1024] Number of pixels along X-axis
31- 34 I4 --- Ny [403/1024] Number of pixels along Y-axis
36- 39 I4 --- Nz [31/1001]? Number of slices for datacubes
41- 47 F7.1 km/s RVmin [-2754/-64]? Lower value of radial
velocity interval for data cubes
49- 54 F6.1 km/s RVmax [-41/2647]? Upper value of radial
velocity interval for data cubes
56- 58 F3.1 km/s dRV [0.5/5.4]? Velocity resolution
60- 66 F7.3 GHz Freq [217/221]? Frequency of line observed
68- 74 I7 Kibyte size [642/4100105] Size of FITS file
76-115 A40 --- FileName Name of FITS file in subdirectory fits
117-261 A145 --- Title Title of the file
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Acknowledgements:
Felix Bosco, bosco(at)mpia.de,
Max Planck Institute for Astronomy, Germany
(End) Felix Bosco [Max Planck Inst. Germany], Patricia Vannier [CDS] 13-Aug-2019