J/A+A/668/A67 CO in the ALMA Radio-source Catalogue (ARC) (Audibert+, 2022)
CO in the ALMA Radio-source Catalogue (ARC):
The molecular gas content of radio galaxies as a function of redshift.
Audibert A., Dasyra K.M., Papachristou M., Fernandez-Ontiveros J.A.,
Ruffa I., Bisigello L., Combes F., Salome P., Gruppioni C.
<Astron. Astrophys. 668, A67 (2022)>
=2022A&A...668A..67A 2022A&A...668A..67A (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Millimetric/submm sources ; Carbon monoxide
Keywords: catalogs - ISM: jets and outflows - galaxies: evolution -
galaxies: star formation - galaxies: statistics -
radio lines: galaxies
Abstract:
To evaluate the role of radio activity in galaxy evolution, we
designed a large archival CO survey of radio galaxies (RGs) to
determine their molecular gas masses at different epochs. We used a
sample of 120 RGs representative of the NVSS 1.4GHz survey, when flux
limited at 0.4Jy. Of those, 66 galaxies belonged to the ALMA
Radio-source Catalogue (ARC) of calibrators and had spectral window
tunings around CO (1-0), (2-1), (3-2), or (4-3). We reduced their ALMA
data, determined their H2 mass contents, and combined the results with
similar results for the remaining 54 galaxies from the literature. We
found that, while at all epochs the majority of RGs have undetectable
reservoirs, there is a rapid increase in the H2 mass content of the
CO-detected RGs with z. At 1<z<2.5, one-fourth of the RGs have at
least as much molecular gas as simulations would indicate for a
typical halo mass of that epoch. These galaxies plausibly have
"normal" or even starbursty hosts. Overall, reservoirs of
107≲MH2≲1010M☉ are seen at z<0.3, and
1010≲MH2≲1012M☉ at z>1. Taking into account the
completeness correction of the sample, we created the corresponding
H2 mass functions at 0.005<z<0.3 and 1<z<2.5. The local mass
function reveals that the number density of low-z RGs with detectable
molecular gas reservoirs is only a little lower (a factor of ∼4) than
that of pure (or little star-forming) type 1 and 2 AGN in simulations.
At 1<z<2.5, there is a significant decrease in the number density of
high-z RGs due to the rarity of bright radio galaxies. An estimate for
the missing faint RGs would, nonetheless, bring populations close
again. Finally, we find that the volume density of molecular gas
locked up in the brightest 1/5000-1/7000 RGs is similar in the
examined z bins. This result likely indicates that the inflow rate on
one hand and the star-formation depletion rate plus the jet-driven
expulsion rate on the other hand counteract each other in the most
luminous RGs of each epoch.
Description:
We report the reduced ALMA archival CO(1-0) up to CO(4-3) data cubes
for the 17 radio galaxies detected in CO. We datacubes were created in
CASA using a robust parameter set to 2 and the minimum velocity
resolution possible among [20,60,100]km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 180 19 List of fits datacubes
fits/* . 19 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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 32 I3 --- Nz Number of pixels along Z-axis
34- 59 A26 "datime" Obs.date Observation date
61- 70 E10.4 m/s bVRAD Lower value of VRAD
72- 80 E9.4 m/s BVRAD Upper value of VRAD
82- 87 I6 m/s dVRAD VRAD resolution
89- 95 I7 Kibyte size Size of FITS file
97-119 A23 --- Name Galaxy name
121-163 A43 --- FileName Name of FITS file, in subdirectory fits
165-180 A16 --- Title Title of the FITS file
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Acknowledgements:
Anelise Audibert, anelise.audibert(at)iac.es
(End) Patricia Vannier [CDS] 14-Sep-2022