J/A+A/608/A48 HAE229 CO (1-0) ATCA datacube (Dannerbauer+, 2017)
The implications of the surprising existence of a large massive CO disk in a
distant protocluster.
Dannerbauer H., Lehnert M.D., Emonts B., Ziegler B., Altieri B.,
De Breuck C., Hatch N., Kodama T., Koyama Y., Kurk J.D., Matiz T.,
Miley G., Narayanan D., Norris R.P., Overzier R., Roettgering H.J.A.,
Sargent M., Seymour N., Tanaka M., Valtchanov I., Wylezalek D.
<Astron. Astrophys. 608, A48 (2017)>
=2017A&A...608A..48D 2017A&A...608A..48D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Photometry, H-alpha ; Carbon monoxide
Keywords: galaxies: clusters: individual: MRC1138-262 -
galaxies: high-redshift - galaxies: evolution - galaxies: ISM -
submillimeter: galaxies - galaxies: individual: HAE229
Abstract:
It is not yet known if the properties of molecular gas in distant
protocluster galaxies are significantly acted by their environment as
galaxies are in local clusters. Through a deep, 64 hours of effective
on-source integration with the Australian Telescope Compact Array
(ATCA), we discovered a massive, Mmol=2.0±0.2x011M☉,
extended, ∼40kpc, CO(1-0)-emitting disk in the protocluster
surrounding the radio galaxy, MRC1138-262. The galaxy, at
zCO=2.1478, is a clumpy, massive disk galaxy, M*∼5x1011M☉,
which lies 250kpc in projection from MRC1138-262 and is a known
Hα emitter, named HAE229. This source has a molecular gas
fraction of ∼30%. The CO emission has a kinematic gradient along its
major axis, centered on the highest surface brightness rest-frame
optical emission, consistent with HAE229 being a rotating disk.
Surprisingly, a significant fraction of the CO emission lies outside
of the UV/optical emission. In spite of this, HAE229 follows the same
relation between star-formation rate and molecular gas mass as normal
field galaxies.
HAE229 is the first CO(1-0) detection of an ordinary, star-forming
galaxy in a protocluster.We compare a sample of cluster members at
z>0.4 that are detected in low-order CO transitions, with a similar
sample of sources drawn from the field.We confirm findings that the
CO-luminosity and full-width at half maximum (FWHM) are correlated in
starbursts and show that this relation is valid for normal high-z
galaxies as well as for those in overdensities. We do not find a clear
dichotomy in the integrated Schmidt-Kennicutt relation for
protocluster and field galaxies. Our results suggest that environment
does not have an impact on the "star-formation electronic
efficiency" or the molecular gas content of high-redshift galaxies.
Not finding any environmental dependence in these characteristics,
especially for such an extended CO disk, suggests that
environmentally-specific processes such as ram pressure stripping do
not operate electronic efficiently in (proto)clusters.
Description:
Our CO(1-0) observations of HAE229 were performed with the Australia
Telescope Compact Array during April 2011 - February 2015 in the H75,
H168, H214, 750A, 750D, and 1.5A array configurations and only
including baselines ranging from 31-800m in our reduction.
We provide the reduced ATCA data cube of HAE229. The units are in
Jy/beam.
Objects:
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RA (2000) DE Designation(s)
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11 40 46.1 -26 29 12 HAE229 = [KPR2004] HA 229
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 132 1 Informations on datacube
HAE229_cube.fits 2880 1173 Fits datacube
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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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 28 I3 --- Nz Number of slices
30- 50 A21 --- Obs.date Observation date (YYYY-MM-DDThh:mm:ss.s)
52- 63 E12.6 m/s bHV Lower value of heliocentric velocity interval
65- 75 E11.6 m/s BHV Upper value of heliocentric velocity interval
77- 81 I5 m/s dHV Heliocentric velocity resolution
83- 86 I4 Kibyte size Size of FITS file
88-103 A16 --- FileName Name of FITS file
105-132 A28 --- Title Title of the FITS file
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Acknowledgements:
Helmut Dannerbauer, helmut(at)iac.es
(End) Patricia Vannier [CDS] 11-Oct-2017