J/A+A/562/A35 Radio spectra of HDF850.1 (Neri+, 2014)
High-resolution C+ imaging of HDF850.1 reveals a merging galaxy at z = 5.185.
Neri R., Downes D., Cox P., Walter F.
<Astron. Astrophys. 562, A35 (2014)>
=2014A&A...562A..35N 2014A&A...562A..35N
ADC_Keywords: Galaxies, radio ; Millimetric/submm sources ; Galaxies, spectra
Keywords: galaxies: high-redshift - galaxies: kinematics and dynamics -
galaxies: ISM - galaxies: individual: HDF850.1
Abstract:
New high-resolution maps with the IRAM interferometer of the
redshifted C+ 158um line and the 0.98mm dust continuum of HDF850.1 at
z=5.185 show the source to have a blueshifted northern component and a
redshifted southern component, with a projected separation of 0.3", or
2kpc. We interpret these components as primordial galaxies that are
merging to form a larger galaxy.
Description:
To further investigate HDF850.1's morphology, we re-observed its C+
line and adjacent millimeter continuum with the IRAM Plateau de Bure
Interferometer in the A configuration, with long baselines to 760m, in
February 2012, and in the B configuration in March 2012. We combined
the new data with the earlier observations (Walter et al.,
2012Natur.486..233W 2012Natur.486..233W) from November 2011, in the shorter-baseline
C-configuration. The observations were made at 307.267GHz (0.98mm),
the frequency of the 2P3/2->2P1/2 fine-structure line of C+
at a redshift of z=5.1853.
Objects:
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RA (2000) DE Designation(s)
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12 36 51.72 +62 12 21.4 HDF850.1 = [HSD98] HDF850.1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig2.dat 32 90 Spectra data
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Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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2- 8 F7.1 km/s Vlsr Velocity (LSR reference frame)
12- 16 F5.2 mJy SintN Spatially integrated flux density (HDF850.1-N)
(blueshifted)
20- 24 F5.2 mJy SintS Spatially integrated flux density (HDF850.1-S)
(redshifted)
28- 32 F5.2 mJy Sint Sum of spatially integrated flux density for
HDF850.1-N and HDF850.1-S (HDF850.1-N+S)
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Acknowledgements:
Dennis Downes, downes(at)iram.fr
(End) Patricia Vannier [CDS] 20-Dec-2013