J/A+A/660/A137 COSMOS/AzTEC-3 submillimeter galaxy datacube (Guaita+, 2022)
Tomography of the environment of the COSMOS/AzTEC-3 submillimeter galaxy at
z∼5.3 revealed by Lymanα and MUSE observations.
Guaita L., Aravena M., Gurung-Lopez S., Cantalupo S., Marino R.,
Riechers D., da Cunha E., Wagg J., Algera H.S.B., Dannerbauer H., Cox P.
<Astron. Astrophys. 660, A137 (2022)>
=2022A&A...660A.137G 2022A&A...660A.137G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Millimetric/submm sources
Keywords: galaxies: high-redshift - galaxies: interactions -
galaxies: evolution - galaxies: kinematics and dynamics -
galaxies: starburst - galaxies: clusters: general -
Abstract:
Submillimeter galaxies (SMGs) have been proposed as the progenitors of
massive ellipticals in the local Universe. Mapping the neutral gas
distribution and investigating the gas accretion toward the SMGs at
high redshift can provide information on the way SMG environments can
evolve into clusters at z=0.
In this work, we study the members of the protocluster around AzTEC-3,
a submillimeter galaxy at z=5.3. We use Lyα emission and its
synergy with previous CO and [CII]158um observations.
We analyzed the data from the Multi Unit Spectroscopic Explorer (MUSE)
instrument in an area of 1.4x1.4arcmin2 around AzTEC-3 and derived
information on the Lyα line in emission. We compared the
Lyα profile of various regions of the environment with the zELDA
radiative transfer model, revealing the neutral gas distribution and
kinematics.
We identified ten Lyα emitting sources, including two regions
with extended emission: one embedding AzTEC-3 and LBG-3, which is a
star-forming galaxy located 2" (12kpc) north of the SMG and another
toward LBG-1, which is a star-forming galaxy located 15" (90kpc) to
the southeast. The two regions extend for ∼27x38kpc2
(∼170x240ckpc2) and ∼20x20kpc2 (∼125x125ckpc2), respectively.
The sources appear distributed in an elongated configuration of about
70" (430kpc) in extent. The number of sources confirms the
overdensity around AzTEC-3. We study the MUSE spectra of the
AzTEC-3+LBG-3 system and LBG-1 in detail. For the AzTEC-3+LBG-3
system, the Lyα emission appears redshifted and more spatially
extended than the [CII] line emission. Similarly, the Lyα
line spectrum is broader in velocity than [CII] for LBG-1. In the
former spectrum, the Lyα emission is elongated to the north of
LBG-3 and to the south of AzTEC-3, where a faint Lyα emitting
galaxy is also located. The elongated structures could resemble tidal
features due to the interaction of the two galaxies with AzTEC-3.
Also, we find a bridge of gas, revealed by the Lyα emission
between AzTEC-3 and LBG-3. The Lyα emission toward LBG-1 embeds
its three components. The HI kinematics support the idea of a merger
of the three components.
Given the availability of CO and [CII] observations from previous
campaigns, and the Lyα information from our MUSE dataset, we
find evidence of starburst-driven phenomena and interactions around
AzTEC-3. The stellar mass of the galaxies of the overdensity and the
Lyα luminosity of the HI nebula associated with AzTEC-3 imply a
dark matter halo of ∼1012M☉ at z=5.3. By comparing this with
semi-analytical models, the dark matter halo mass indicates that the
region could evolve into a cluster of 2x1013M☉ by z=2 and into
a Fornax-type cluster at z=0 with a typical mass of 2x1014M☉.
Description:
The fits file is the reduced datacube used to detect the sources
analyzed in the paper. The datacube is a mosaic of the entire observed
area aligned to an official WCS.
Objects:
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RA (2000) DE Designation(s)
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10 00 20.69 +02 35 20.4 AzTEC 3 = AzTEC J100020.71+023518.2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 173 1 Information in fits datacube
fits/* . 1 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- 22 F3.1 arcsec/pix scale Scale of the image
24- 26 I3 --- Nx Number of pixels along X-axis
28- 30 I3 --- Ny Number of pixels along Y-axis
32- 35 I4 --- Nz Number of slices
37- 59 A23 "datime" Obs.date Observation date
61- 67 F7.2 0.1nm bAWAV Lower value of AWAV (in Angstroem)
69- 75 F7.2 0.1nm BAWAV Upper value of AWAV (in Angstroem)
77- 80 F4.2 0.1nm dAWAV AWAV resolution (in Angstroem)
82- 88 I7 Kibyte size Size of FITS file
90-137 A48 --- FileName Name of FITS file, in subdirectory fits
139-173 A35 --- Title Title of the FITS file
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Acknowledgements:
Lucia Guaita, lucia.guaita(at)gmail.com
(End) Patricia Vannier [CDS] 08-Feb-2022