J/A+A/628/A23 SPT0346-52 CO and H2O ALMA images (Apostolovski+, 2019)
Imaging the molecular interstellar medium in a gravitationally lensed
star-forming galaxy at z = 5.7.
Apostolovski Y., Aravena M., Anguita T., Spilker J., Weiss A.,
Bethermin M., Chapman S.C., Chen C.-C., Cunningham D., De Breuck C.,
Dong C., Hayward C.C., Hezaveh Y., Jarugula S., Litke K., Ma J.,
Marrone D.P., Narayanan D., Reuter C.A., Rotermund K., Vieira J.
<Astron. Astrophys. 628, A23 (2019)>
=2019A&A...628A..23A 2019A&A...628A..23A (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Gravitational lensing ; Millimetric/submm sources
Keywords: galaxies: high-redshift - galaxies: ISM - galaxies: star formation -
ISM: molecules
Abstract:
We present and study spatially resolved imaging obtained with the
Atacama Large Millimeter/submillimeter Array (ALMA) of multiple
12CO(J=6-5, 8-7 and 9-8) and two H2O(202-111 and 211-202)
emission lines and cold dust continuum toward the gravitationally
lensed dusty star forming galaxy SPT0346-52 at z=5.656.
Using a visibility-domain source-plane reconstruction we probe the
structure and dynamics of the different components of the interstellar
medium (ISM) in this galaxy down to scales of 1kpc in the source
plane.
Measurements of the intrinsic sizes of the different CO emission lines
indicate that the higher J transitions trace more compact regions in
the galaxy. Similarly, we find smaller dust continuum intrinsic sizes
with decreasing wavelength, based on observations at rest-frame 130,
300 and 450um. The source shows significant velocity structure, and
clear asymmetry where an elongated structure is observed in the source
plane with significant variations in their reconstructed sizes. This
could be attributed to a compact merger or turbulent disk rotation.
The differences in velocity structure through the different line
tracers, however, hint at the former scenario in agreement with
previous [CII] line imaging results. Measurements of the CO line
ratios and magnifications yield significant variations as a function
of velocity, suggesting that modeling of the ISM using integrated
values could be misinterpreted. Modeling of the ISM in SPT0346-52
based on delensed fluxes indicate a highly dense and warm medium,
qualitatively similar to that observed in high redshift quasar hosts.
Description:
Observations of SPT0346-52 were performed with ALMA bands 3 and 4 as a
part of projects 2013.1.00722.S and 2015.1.00117.S during ALMA cycles
2 and 3, respectively (PI: M. Aravena). Cycle 2 and 3 observations
were conducted during April and May of 2015, and during April of 2016,
respectively.
Objects:
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RA (2000) DE Designation(s)
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03 46 41.19 -52 05 05.5 SPT0346-52 = SPT-S J034640-5204.9
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 154 5 List of datacubes
fits/* . 5 Individual datacubes
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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 slices
32- 57 A26 "datime" Obs.date Observation date
59- 65 F7.3 GHz bFreq Lower value of frequency interval
67- 73 F7.3 GHz BFreq Upper value of frequency interval
75- 85 E11.6 Hz dFreq Frequency resolution
87- 92 I6 Kibyte size Size of FITS file
94-104 A11 --- FileName Name of FITS file, in subdirectory fits
106-154 A49 --- Title Title of the FITS file
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Acknowledgements:
Yordanka Apostolovski, yordanka.apostolovski(at)gmail.com
(End) Patricia Vannier [CDS] 17-Jul-2019