J/A+A/615/A94 ALMA massive protocluster gas clumps maps (Fontani+, 2018)
Fragmentation properties of massive protocluster gas clumps: an ALMA study.
Fontani F., Commercon B., Giannetti A., Beltran M.T., Sanchez-Monge A.,
Testi L., Brand J., Tan J.C.
<Astron. Astrophys. 615, A94 (2018)>
=2018A&A...615A..94F 2018A&A...615A..94F (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Infrared sources ; Radio lines
Keywords: ISM: clouds - stars: formation
Abstract:
Fragmentation of massive dense molecular clouds is the starting point
in the formation of rich clusters and massive stars. Theory and
numerical simulations indicate that the population of the fragments
(number, mass, diameter, separation) resulting from the gravitational
collapse of such clumps is probably regulated by the balance between
the magnetic field and the other competitors of self-gravity, in
particular turbulence and protostellar feedback. We have observed 11
massive, dense and young star-forming clumps with the Atacama Large
Millimeter Array (ALMA) in the thermal dust continuum emission at 1mm
with an angular resolution of 0.25 arcseconds with the aim of
determining their population of fragments.
Description:
Observations with the ALMA array at a frequency of ∼278GHz were
performed during cycles 2 and 3 in configuration C36-6 with baselines
of up to 1091m, providing an angular resolution of 0.25" and a maximum
recoverable scale of 3.5". The total integration time on each source
was ∼18-20min. Bandpass and phases were calibrated by observing
J1427-4206 and J1617-5848, respectively.The absolute flux scale
was set through observations of Titan and Ceres. Continuum was
extracted by averaging in frequency the line-free channels. The total
bandwidth used is ∼1.7GHz.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 131 9 List of fits images
fits/* . 9 Individual fits images
--------------------------------------------------------------------------------
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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 55 A26 --- Obs.date Observation date (YYYY-MM-DDThh:mm:ss.sssssss)
57- 63 F7.3 GHz Freq ? Observed frequency
65- 68 I4 Kibyte size Size of FITS file
70-112 A43 --- FileName Name of FITS file, in subdirectory fits
114-131 A18 --- Name Clump name
--------------------------------------------------------------------------------
Acknowledgements:
Francesco Fontani, fontani(at)arcetri.astro.it
(End) Francesco Fontani [INAF-OAA, Italy], Patricia Vannier [CDS] 10-Jul-2018