J/A+A/710/A218 Coma Cluster DESI galaxies (Pedratti+, 2026)
Novel insights on the Coma Cluster kinematics with DESI.
I. Linking mass profile, orbital anisotropy and galaxy populations.
Pedratti S., Pizzuti L., Fossati M., Biviano A., Boselli A., Ragagnin A.,
Carlin A.
<Astron. Astrophys. 710, A218 (2026)>
=2026A&A...710A.218P 2026A&A...710A.218P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Optical ; Redshifts
Keywords: galaxies: evolution - galaxies: clusters: individual: Coma -
galaxies: kinematics and dynamics
Abstract:
We investigate the kinematic properties of the Coma galaxy cluster
using a new, large, spectroscopic sample of member galaxies, from the
Dark Energy Spectroscopic Instrument (DESI). By means of the
MG-MAMPOSST code, which is based on the Jeans equation, we jointly
reconstruct the total cluster mass profile and the velocity anisotropy
profile. Assuming a Navarro-Frenk-White model, we estimate a virial
mass of M200c=1.04+0.07-0.08(stat)±0.09(syst)x1015M☉,
corresponding to r200c=2.07±0.05Mpc and a scale radius
for the mass profile of rs=0.73+0.30-0.24 (stat) ± 0.21 (syst)
Mpc, which provides the tightest robust kinematic mass profile
constraint to date. By separately considering the mass of the hot gas
and the galaxy stellar mass, we further determined the dark matter
mass profile, with M200cDM=8.6+1.2-0.8x1014M☉. We
discuss the impact of the mass and galaxy number density
parametrisations, the effect induced by different choices of the
cluster's rest frame and of the radial range of the kinematic
analysis, further comparing our results with previous estimates from
the literature. The cluster dynamical state was also assessed, using
the spatial and line-of-sight velocity distributions of the members.
We also analysed the line-of-sight velocity distributions and
anisotropy profiles of different galaxy populations, selected based on
their colour (red sequence, green valley, and blue cloud). The orbits
of green valley and blue cloud galaxies appear to be more radial in
the centre and in the outskirts, respectively, with the latter
predicting a higher cluster virial mass. This study provides new
insights into the interplay between dynamical and intrinsic properties
of galaxies in massive structures, which is fundamental to verify the
tight connection between a galaxy's evolution and its environment.
Description:
This table contains the initial sample of 2087 galaxies in the Coma
cluster field, prior to the application of any magnitude cut or
cluster membership selection. The catalogue includes identifiers,
equatorial coordinates, redshifts, and photometric magnitudes in the g
and r bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 83 2087 Galaxy sample before magnitude cut
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See also:
V/161 : DESI DR1 redshift catalog (DESI Col.+ 2025)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- TargetID DESI galaxy identifier
21- 35 F15.11 deg RAdeg Mean fiber right ascension (J2000)
37- 51 F15.11 deg DEdeg Mean fiber declination (J2000)
53- 67 E15.9 --- z Redshift
69- 75 F7.4 mag gmag g-band magnitude
77- 83 F7.4 mag rmag r-band magnitude
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Acknowledgements:
Stefano Pedratti, s.pedratti1(at)campus.unimib.it
License: CC-BY-4.0
(End) Patricia Vannier [CDS] 30-Apr-2026