J/A+A/632/L7 High-redshift molecular outflow (Jones+, 2019)
Detection of a high-redshift molecular outflow in a primeval hyperstarburst
galaxy.
Jones G.C., Maiolino R., Caselli P., Carniani S.
<Astron. Astrophys. 632, L7 (2019)>
=2019A&A...632L...7J 2019A&A...632L...7J (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Interstellar medium
Keywords: galaxies: high-redshift - galaxies: starburst -
ISM: jets and outflows
Abstract:
We report the discovery of a high-redshift, massive molecular outflow
in the starburst galaxy SPT 0346-52 (z=5.656) via the detected
absorption of high-excitation water transitions (H2O 42,3-41,4
and H2O 33,0-32,1) with the Atacama Large
Millimeter/submillimeter Array (ALMA). The host galaxy is one of the
most powerful starburst galaxies at high redshift (star formation
rate; SFR∼3600M☉/yr), with an extremely compact (∼320pc) star
formation region and a SFR surface density
({SIGMA}SFR∼5500M☉/yr/kpc2) five times higher than "maximum"
(i.e. Eddington-limited) starbursts, implying a highly transient
phase. The estimated outflow rate is ∼500M☉/yr, which is much
lower than the SFR, implying that in this extreme starburst the
outflow capabilities saturate and the outflow is no longer capable of
regulating star formation, resulting in a runaway process in which
star formation will use up all available gas in less than 30Myr.
Finally, while previous kinematic investigations of this source
revealed possible evidence for an ongoing major merger, the
coincidence of the hyper-compact starburst and high-excitation water
absorption indicates that this is a single starburst galaxy surrounded
by a disc.
Description:
Included are the reduced ALMA data cubes analysed in this paper: the
continuum-subtracted cube containing H2O 4(2,3)-4(1,4)
[AA201936989H2O4CS.fits] and the continuum-subtracted cube
containing 3(3,0)-3(2,1) [AA201936989H2O3CS.fits].
In addition, we have included a continuum image using the line-free
channels of all four SPWs [AA201936989_CONTINUUM.fits].
The uncalibrated data and calibration pipeline are available from the
ALMA data archive (https://almascience.eso.org/asax/), under project
code 2016.1.01313.S.
Objects:
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RA (2000) DE Designation(s)
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03 46 41.19 -52 05 05.5 SPT 0346-52 = 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 182 3 List of fits files
fits/* . 3 Individual fits files
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See also:
J/A+A/628/A23 : SPT0346-52 CO and H2O ALMA images (Apostolovski+, 2019)
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, for the datacubes
32- 54 A23 "datime" Obs.date Observation date
56- 66 E11.6 km/s bVel ? Lower value of velocity interval,
for the datacubes
68- 78 E11.6 km/s BVel ? Upper value of velocity interval,
for the datacubes
80- 86 F7.5 km/s dVel ? Velocity resolution, for the datacubes
88- 93 I6 Kibyte size Size of FITS file
95-120 A26 --- FileName Name of FITS file, in subdirectory fits
122-182 A61 --- Title Title of the FITS file
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Acknowledgements:
Gareth Jones, gcjones8(at)gmail.com
(End) Patricia Vannier [CDS] 21-Nov-2019