J/A+A/561/A49 867um image of SBS 0335-052 with ALMA (Hunt+, 2014)
ALMA observations of cool dust in a low-metallicity starburst, SBS 0335-052.
Hunt L.K., Testi L., Casasola V., Garcia-Burillo S., Combes F., Nikutta R.,
Caselli P., Henkel C., Maiolino R., Menten K.M., Sauvage M., Weiss A.
<Astron. Astrophys. 561, A49 (2014)>
=2014A&A...561A..49H 2014A&A...561A..49H
ADC_Keywords: Galaxies, optical ; Millimetric/submm sources
Keywords: galaxies: starburst - galaxies: dwarf - galaxies: star formation -
galaxies: ISM - galaxies: individual: SBS0335-052 -
galaxies: individual: IZw18
Abstract:
We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 0
Band 7 observations of an extremely metal-poor dwarf starburst galaxy
in the Local Universe, SBS 0335-052 (12+log(O/H)∼7.2). With these
observations, dust is detected at 870um (ALMA Band 7), but 87% of the
flux in this band is due to free-free emission from the starburst.
Description:
The observations were carried out in five separate sessions from Jul.
30 through Aug. 14, 2012 with the ALMA observatory as part of Early
Science Cycle 0. The average number of antennas was 24 and the array
was in the Early Science extended configuration providing baselines up
to 400m. SBS 0335-052 was observed with Band 7, simultaneously
in the continuum and in the 12CO(3-2) transition, with a rest
frequency of 345.79599GHz. The central sky frequencies of the upper
and lower sidebands were ∼352GHz and ∼340GHz, respectively. The
observations were done as 6 executions of the same scheduling block.
The unresolved extragalactic source J0339-017 was used for complex
gain calibration, while Callisto or Uranus were used as flux
calibrators. The measured fluxes of J0339-017 during the various
observing sessions were consistently found to be ∼0.98Jy and ∼0.95Jy
at 340GHz and 352GHz, respectively. The flux density scale accuracy
is expected to be better than 5%.
Objects:
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RA (2000) DE Designation(s)
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03 37 44.04 -05 02 38.5 SBSG 0335-052 = SBSG 0335-052
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 79 1 Information on FITS image
alma_346.fits 2880 55 ALMA FITS image of SBS0335-052 at 346GHz (867um)
(file originally named "almac0346_cont.fits")
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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 F3.1 arcsec/pix Scale Scale of the image
24- 26 I3 pix Nx Number of pixels along X-axis
27 A1 --- --- [x]
28- 30 I3 pix Ny Number of pixels along Y-axis
32- 46 E15.10 Hz RFreq Rest frequency (ALMA Band 7)
48- 57 E10.5 Hz OFreq Observed frequency (1)
59- 79 A21 --- FileName Name of FITS file
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Note (1): 1 sigma RMS continuum: 0.035 mJy/beam. Brightness units: Jy/beam.
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Acknowledgements:
Leslie Hunt, hunt(at)arcetri.astro.it
(End) Patricia Vannier [CDS] 31-Dec-2013