J/A+A/641/A22 CARLA J1103+3449 cluster datacube (Markov+, 2020)
Massive molecular gas reservoir around the central AGN in the
CARLA J1103+3449 cluster at z=1.44.
Markov V., Mei S., Salome P., Combes F., Stern D., Galametz A.,
De Breuck C., Wylezalek D., Amodeo S., Cooke E.A., Gonzalez A.H.,
Hatch N.A., Noirot G., Rettura A., Seymour N., Stanford S.A., Vernet J.
<Astron. Astrophys. 641, A22 (2020)>
=2020A&A...641A..22M 2020A&A...641A..22M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Radio lines ; Carbon monoxide
Keywords: galaxies: clusters: individual: CARLA J1103+3449 -
galaxies: evolution - galaxies: star formation - galaxies: jets -
radio continuum: galaxies
Abstract:
Passive early-type galaxies dominate cluster cores at z≲1.5. At
higher redshift, cluster core galaxies are observed to have on-going
star-formation, which is fuelled by cold molecular gas.We measured the
molecular gas reservoir of the central region around the radioloud
active galactic nucleus (AGN) in the cluster CARLA J1103+3449 at
z=1.44 using NOEMA. The AGN synchrotron emission dominates the
continuum emission at 94.48GHz, and we measured its flux at the AGN
position and at the position of two radio jets. Combining our
measurements with published results over the range 4.71GHz-94.5GHz,
and assuming Ssynch∝ν-α, we obtain a flat
spectral index of = 0:14 0:03 for the AGN core emission, and a steeper
index of α=1.43±0.04 and α=1.15±0.04 at positions
close to the western and eastern lobes, respectively. The total
spectral index is α=0.92±0.02 over the range 73.8MHz-94.5GHz.We
detect two CO(2-1) emission lines, both blueshifted with respect to
the AGN. Their emission corresponds to two regions, 17kpc southeast
and 14kpc southwest of the AGN, not associated with galaxies. In these
two regions, we find a total massive molecular gas reservoir of
Mtotgas=3.9±0.4x1010M☉, which dominates (≳60%) the
central total molecular gas reservoir. These results can be explained
by massive cool gas flows in the center of the cluster. The AGN
early-type host is not yet quenched; its star formation rate is
consistent with being on the main sequence of star-forming galaxies in
the field (star formation rate ∼30-140M[sun/yr), and the cluster
core molecular gas reservoir is expected to feed the AGN and the host
star formation before quiescence. The other confirmed cluster members
show star formation rates at 2 below the field main sequence at
similar redshifts and do not have molecular gas masses larger than
galaxies of similar stellar mass in the field.
Description:
We observe CARLA J1103+3449 with the IRAM/NOEMA (P.I.: A. Galametz,
S. Mei), with eight antennas over a five day period (28-30 July, 3-4
August 2017), for a total exposure time of 29h (including overheads).
We targeted the CO(2-1) emission line at the rest-frame frequency
νrest=230.538GHz, which is redshifted to νobs=94.48GHz at
z=1.44.
Objects:
-------------------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------------------
11 03 26.26 +34 49 47.2 CARLA J1103+3449 = VLSS J1103.4+3449
-------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 133 1 Information on fits datacube
fits/* . 1 Fits datacube
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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 pixels along Z-axis
31- 40 E10.4 m/s bVRAD Lower value of VRAD interval
42- 50 E9.4 m/s BVRAD Upper value of VRAD interval
52- 57 I6 m/s dVRAD VRAD resolution
59- 63 I5 Kibyte size Size of FITS file
65- 75 A11 --- FileName Name of FITS file, in subdirectory fits
77-133 A57 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Simona Mei, simona.mei(at)obspm.fr
(End) Patricia Vannier [CDS] 21-Jul-2020