J/A+A/646/A122 NOEMA millimeter reduced data cubes of HerBS-89a (Berta+, 2021)
Close-up view of a luminous star-forming galaxy at z=2.95.
Berta S., Young A., Cox P., Neri R., Jones B., Baker A., Omont A., Dunne L.,
Carnero Rosell A., Marchetti L., Negrello M., Yang C., Riechers D.,
Dannerbauer H., Perez-Fournon I., van der Werf P., Bakx T., Ivison R.,
Beelen A., Buat V., Cooray A., Cortzen I., Dye S., Eales S., Gavazzi R.,
Harris A.I., Herrera C.N., Hughes D., Jin S., Krips M., Lagache G.,
Lehnert M., Messias H., Serjeant S., Stanley F., Urquhart S., Vlahakis C.,
Weiss A.
<Astron. Astrophys. 646, A122 (2021)>
=2021A&A...646A.122B 2021A&A...646A.122B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; H II regions ; Millimetric/submm sources ;
Spectra, millimetric/submm
Keywords: galaxies: high-redshift - galaxies: ISM - galaxies: star formation -
gravitational lensing: strong - submillimeter: galaxies -
radio lines: ISM
Abstract:
Exploiting the sensitivity of the IRAM NOrthern Extended Millimeter
Array (NOEMA) and its ability to process large instantaneous
bandwidths, we have studied the morphology and other properties of the
molecular gas and dust in the starburst galaxy, H-ATLAS
J131611.5+281219 (HerBS- 89a), at z=2.95. High angular resolution
(0.3") images reveal a partial 1.0" diameter Einstein ring in the dust
continuum emission and the molecular emission lines of 12CO(9-8) and
H2O(202-111). Together with lower angular resolution (0.6")
images, we report the detection of a series of molecular lines
including the three fundamental transitions of the molecular ion OH+,
namely (11-01), (12-01) and (10-01), seen in absorption;
the molecular ion CH+(1-0) seen in absorption (and tentatively in
emission); two transitions of amidogen (NH2), namely (202-111)
and (220-211) seen in emission; and HCN(11-10) and/or
NH(12-01) seen in absorption. The NOEMA data are complemented with
Very Large Array data tracing the 12CO(1-0) emission line, which
provides a measurement of the total mass of molecular gas and an
anchor for a CO excitation analysis. In addition, we present Hubble
Space Telescope imaging that reveals the foreground lensing galaxy in
the near-infrared (1.15um). Together with photometric data from the
Gran Telescopio Canarias, we derive a photometric redshift of
zphot=0.9+0.3-0.5 for the foreground lensing galaxy. Modelling the
lensing of HerBS-89a, we reconstruct the dust continuum (magnified by
a factor µ~=5.0) and molecular emission lines (magnified by
µ∼4-5) in the source plane, which probe scales of ∼0.1" (or 800pc).
The 12CO(9-8) and H2O(202-111) emission lines have comparable
spatial and kinematic distributions; the source-plane reconstructions
do not clearly distinguish between a one-component and a two-component
scenario, but the latter, which reveals two compact rotating
components with sizes of ~=1kpc, that are likely merging, more
naturally accounts for the broad line widths observed in HerBS-89a. In
the core of HerBS-89a, very dense gas with nH2∼107-9cm-3 is
revealed by the NH2 emission lines and the possible HCN(11-10)
absorption line. HerBS-89a is a powerful star forming galaxy with a
molecular gas mass of Mmol=(2.1±0.4)x1011M☉, an infrared
luminosity of LIR=(4.6±0.4)x1012L☉, and a dust mass of
Mdust=(2.6±0.2)x109M☉, yielding a dust-to-gas ratio
δGDR~=80. We derive a star formation rate
SFR=614±59M☉/yr and a depletion timescale
τdepl=(3.4±1.0)x108years. The OH+ and CH+ absorption lines,
which trace low (∼100cm-3) density molecular gas, all have their
main velocity component red-shifted by {DELTA}V∼100km/s relative to
the global CO reservoir. We argue that these absorption lines trace a
rare example of gas inflow towards the center of a starburst galaxy,
indicating that HerBS-89a is accreting gas from its surroundings.
Description:
We provide the reduced HerBS-89a data cubes. Observations were carried
out with the NOEMA interferometer, under observing programs E18AE and
W19DE. For each campaign, two cubes are available, covering the lower
and upper side bands (LBS and USB) of the instrumental setup. The data
have been processed using the GILDAS software. The Clark cleaning
algorithm was adopted. The spectral cubes belonging to the two
different observing programs are rebinned to 40 and 60km/s velocity
channel widths, respectively. The data have finally been transformed
from the GILDAS to the FITS format using standard GILDAS routines
Objects:
--------------------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------------------
13 16 11.5 +28 12 19 HerBS 89 = H-ATLAS J131611.5+281219
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 108 4 List of fits datacubes
fits/* . 4 Individual fits 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- 43 E12.6 m/s bVRAD Lower value of VRAD interval
45- 55 E11.6 m/s BVRAD Upper value of VRAD interval
57- 61 I5 m/s dVRAD VRAD resolution
63- 68 I6 Kibyte size Size of FITS file
70- 82 A13 --- FileName Name of FITS file, in subdirectory fits
84-108 A25 --- Title Title of the FITS file
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Acknowledgements:
Stefano Berta, berta(at)iram.fr
(End) Stefano Berta [IRAM, France], Patricia Vannier [CDS] 09-Dec-2020