J/A+A/624/A138 G09v1.97 CO and H2O datacubes (Yang+, 2019)
CO, H2O, H2O+ line and dust emission in a z = 3.63 strongly lensed
starburst merger at sub-kiloparsec scales.
Yang C., Gavazzi R., Beelen A., Cox P., Omont A., Lehnert M.D., Gao Y.,
Ivison R.J., Swinbank A.M., Barcos-Munoz L., Neri R., Cooray A., Dye S.,
Eales S., Fu H., Gonzalez-Alfonso E., Ibar E., Michalowski M.J., Nayyeri H.,
Negrello M., Nightingale J., Perez-Fournon I., Riechers D.A., Smail I.,
van der Werf P.
<Astron. Astrophys. 624, A138 (2019)>
=2019A&A...624A.138Y 2019A&A...624A.138Y (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra; Interstellar medium; Millimetric/submm sources
Keywords: galaxies: high-redshift - galaxies: ISM -
gravitational lensing: strong - submillimeter: galaxies -
radio lines: ISM - ISM: molecules
Abstract:
Using the Atacama Large Millimeter/submillimeter Array (ALMA), we
report high angular-resolution observations of the redshift z=3.63
galaxy H-ATLAS J083051.0+013224 (G09v1.97), one of the most luminous
strongly lensed galaxies discovered by the Herschel-Astrophysical
Terahertz Large Area Survey (H-ATLAS). We present 0.2"-0.4" resolution
images of the rest-frame 188 and 419um dust continuum and the CO(6-5),
H2O(211-202), and Jup=2H2O+ line emission. We also report
the detection of H218O(211-202) in this source. The dust
continuum and molecular gas emission are resolved into a nearly
complete ∼1.5" diameter Einstein ring plus a weaker image in the
center, which is caused by a special dual deflector lensing
configuration. The observed line profiles of the CO(6-5),
H2O(211-202), and Jup=2H2O+ lines are strikingly similar. In
the source plane, we reconstruct the dust continuum images and the
spectral cubes of the CO, H2O, and H2O+ line emission at
sub-kiloparsec scales. The reconstructed dust emission in the source
plane is dominated by a compact disk with an effective radius of
0.7±0.1kpc plus an overlapping extended disk with a radius twice as
large. While the average magnification for the dust continuum is
µ∼10-11, the magnification of the line emission varies from 5 to 22
across different velocity components. The line emission of CO(6-5),
H2O(211-202), and H2O+ have similar spatial and kinematic
distributions. The molecular gas and dust content reveal that G09v1.97
is a gas-rich major merger in its pre-coalescence phase, with a total
molecular gas mass of ∼1011M☉. Both of the merging
companions are intrinsically ultra-luminous infrared galaxies (ULIRGs)
with infrared luminosities LIR reaching 4x1012L☉, and the
total LIR of G09v1.97 is (1.4±0.7)x1013L☉. The approaching
southern galaxy (dominating from V=-400 to -150km/s relative to the
systemic velocity) shows no obvious kinematic structure with a
semi-major half-light radius of as=0.4kpc, while the receding galaxy
(0 to 350km/s) resembles an as=1.2kpc rotating disk. The two
galaxies are separated by a projected distance of 1.3kpc, bridged by
weak line emission (-150 to 0km/s) that is co-spatially located with
the cold dust emission peak, suggesting a large amount of cold
interstellar medium (ISM) in the interacting region. As one of the
most luminous star-forming dusty high-redshift galaxies, G09v1.97 is
an exceptional source for understanding the ISM in gas-rich
starbursting major merging systems at high redshift.
Description:
The FITS file of the ALMA observed images and datacubes of the
CO(6-5), H2O(211-202), H2O+ (Jup=2) line and dust continuum
at 870 and 1940 micron of G09v1.97 are presented.
Objects:
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RA (2000) DE Designation(s)
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08 30 51.0 +01 32 24 G09v1.97 = NAME G09v1.97
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 137 5 List of gits images
fits/* . 5 Individual fits images
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See also:
J/A+A/595/A80 : H2O lines reduced spectra in 11 ULIRGs or HyLIRGs (Yang+, 2016)
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- 17 F8.5 deg DEdeg Declination of center (J2000)
19- 21 I3 --- Nx Number of pixels along X-axis
23- 25 I3 --- Ny Number of pixels along Y-axis
27- 33 F7.3 GHz Freq Central sky frequency
35- 38 F4.1 Mbyte size Size of FITS file
40- 63 A24 --- FileName Name of FITS file, in subdirectory fits
65-137 A73 --- Title Title of the FITS file
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Acknowledgements:
Chentao Yang, cyang(at)eso.org
(End) Chentao Yang [ESO Chile], Patricia Vannier [CDS] 06-Mar-2019