J/A+A/708/A361 NOEMA [CII] images in luminous galaxies (Martinez-Cuadra+, 2026)
A NOEMA pilot survey of [C II] line emission in luminous galaxies at z∼6.
Martinez-Cuadra B., Herrera-Camus R., Foerster Schreiber N., Tacconi L.,
Genzel R., Liu D., Harikane Y., Jolly J.B., Naab T., Neri R., Tozzi G.,
Uebler H.
<Astron. Astrophys. 708, A361 (2026)>
=2026A&A...708A.361M 2026A&A...708A.361M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Interstellar medium ; Radial velocities ; Radio sources
Keywords: galaxies: high-redshift - galaxies: ISM - galaxies: structure
Abstract:
We present observations from the Northern Extended Millimeter Array
(NOEMA) of four luminous galaxies at z∼6, when the Universe was less
than 1Gyr old. These galaxies are detected in the [CII] 158um
fine-structure line, and three also exhibit underlying dust continuum
emission. The [CII] line velocities are offset by a few hundred km/s
relative to the Lyα emission, possibly indicating the presence
of outflows or a large reservoir of surrounding atomic gas. From the
combination of dust continuum and rest-frame UV emission, we estimate
that approximately 50% of the star formation is obscured by dust,
consistent with values found in other massive star-forming galaxies at
similar redshifts. The [CII]-to-FIR luminosity ratios of the
continuum-detected galaxies are elevated compared to nearby galaxies
with similar FIR luminosities. In one system, J163026+4315, the [CII]
emission is spatially resolved, allowing us to measure the source size
and FIR surface brightness (FIR). We find that the [CII/FIR ratio as a
function of FIR in this source follows the trends observed in
both local and high-redshift galaxy populations. A kinematic analysis
of the resolved [CII] emission provides tentative evidence for a
rotating disk, although higher angular resolution data are needed to
confirm this. These results demonstrate the power of NOEMA to probe
the physical conditions and structure of the interstellar medium in
galaxies in the first billion years of cosmic history.
Description:
We identified four luminous galaxies J152555+4303, J151657+4228,
J162833+4312, and J163026+4315 at redshift z∼6. This dataset
contains the data cubes of the [CII] line emission of each galaxy.
The [CII] datacubes have a channel width of 40km/s. The spectral axis
is given in velocity (km/s) and the flux densities are expressed in
Jy/beam.
We used the NOEMA interferometer in its most compact configuration (D)
and Band 3 (??? sky = 196.128 ??? 276.000 GHz) to observe the [CII]
158 micron fine-structure line and underlying dust continuum.
Objects:
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RA (2000) DE Designation(s)
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15 16 57.8 +42 28 52.7 J151657+4228 = HSCS J151657+422852
15 25 55.7 +43 03 24.0 J152555+4303 = HSCS J152555+430324
16 28 33.0 +43 12 10.7 J162833+4312 = HSCS J162833+431210
16 30 26.3 +43 15 58.1 J163026+4315 = HSCS J163026+431558
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 139 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- 29 I2 --- Nz Number of slices
31- 37 I7 m/s bVRAD Lower value of VRAD interval
39- 44 I6 m/s BVRAD Upper value of VRAD interval
46- 52 F7.1 m/s dVRAD VRAD Rresolution
54- 57 I4 Kibyte size Size of FITS file
59-107 A49 --- FileName Name of FITS file, in subdirectory fits
109-139 A31 --- Title Title of the FITS file
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Acknowledgements:
B. Martinez-Cuadra, bmartinez2019(at)udec.cl
(End) Patricia Vannier [CDS] 02-Mar-2026