J/A+A/691/A135 Abell 76 and Abell 1307 velocity catalogues (Barrena+, 2024)
Unveiling the shape:
A multi-wavelength analysis of the galaxy clusters Abell 76 and Abell 1307.
Barrena R., Pizzuti L., Chon G., Bohringer H.
<Astron. Astrophys. 691, A135 (2024)>
=2024A&A...691A.135B 2024A&A...691A.135B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies ; Radial velocities ; Photometry, SDSS
Keywords: galaxies: clusters: general -
galaxies: clusters: intracluster medium -
galaxies: clusters: individual: A76 -
galaxies: clusters: individual: A1307
Abstract:
We analyse the dynamical state of the galaxy clusters Abell 76 and
Abell 1307 from the optical point of view, presenting a coherent
scenario that responds to the X-ray emissions observed in these
structures. Our study is based on 231 and 164 spectroscopic redshifts,
for the clusters A76 and A1307, respectively, obtained mostly with the
Telescopio Nazionale Galileo, and complemented with others collected
from the SDSS DR16 spectroscopic database and the literature. We find
that A76 and A1307 are two galaxy clusters at z=0.0390 and 0.0815,
respectively, with velocity dispersions of 650±56km/s and
863±85km/s, and showing velocity distributions following, in
practice, Gaussian profiles. From our dynamical analysis, X-ray
studies and SZ-Planck emission, we obtain a mean total mass
M500=1.7±0.6x1014M☉ and 3.5±1.3x1014M☉ for A76
and A1307, respectively. Using the SDSS DR16 photometric database we
find that the spatial distribution of likely cluster members in the
case of A76 is very anisotropic, while A1307 shows a compact
distribution of galaxies, but double peaked and elongated in the
south-north direction. Using XMM-Newton X-ray data, we compare the
surface brightness maps with galaxy distributions and see that both
distributions are correlated. We reconstruct the total mass profile
and velocity anisotropy of both clusters by analysing the full
projected phase space, through the MG-MAMPOSSt code. Our study reveals
a slight indication of radial orbits for A76, while A1307 seems to
prefer more isotropic orbits in the whole cluster range. Summarizing,
A76 represent a typical young cluster, in an early stage of formation,
with a very low X-ray surface brightness but high temperature showing
a very anisotropic galaxy distribution. A1307 is however more
consolidated and massive showing in-homogeneous galaxy distribution
and an asymmetric X-ray emission, which suggest a scenario
characterised by recent minor mergers.
Description:
Full spectroscopic samples in the A76 and A1307 fields, which compile
231 and 164 spectroscopic redshifts, respectively. The new spectra
obtained with the 3.5m TNG telescope present a mean signal-to-noise
ratio (S/N) of 9.5 and a mean error of 57km/s. We detected 78 and 32
star-forming galaxies in A76 and A1307 fields, respectively, marked
with the label "ELG" in these catalogues. Also, Bright Cluster
Galaxies are labeled with as "BCGN"
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 59 231 Velocity catalogue of galaxies measured
spectroscopically in the A76 field
tablea2.dat 59 164 Velocity catalogue of galaxies measured
spectroscopically in the A1307 field
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Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Identifier number
4 A1 --- Flag [*] "*" means "classified as cluster member"
7- 8 I2 h RAh Right Ascension (J2000) at Ep=1989.0
10- 11 I2 min RAm Right Ascension (J2000) at Ep=1989.0
13- 17 F5.2 s RAs Right Ascension (J2000) at Ep=1989.0
19- 20 I2 deg DEd Declination (J2000) at Ep=1989.0
22- 23 I2 arcmin DEm Declination (J2000) at Ep=1989.0
25- 28 F4.1 arcsec DEs Declination (J2000) at Ep=1989.0
31- 36 I6 km/s RV Radial Velocity
38- 40 I3 km/s e_RV Error in radial Velolity
43- 47 F5.2 mag gmag ?=99.99 Magnitude in g'-band
49- 53 F5.2 mag rmag ?=99.99 Magnitude in r'-band
56- 59 A4 --- Comment Emission line galaxy or BCG (ELG or BCGN)
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Acknowledgements:
Rafael Barrena, rbarrena(at)iac.es
(End) Rafael Barrena [IAC, ULL], Patricia Vannier [CDS] 01-Oct-2024