J/other/RNAAS/7.51 Brightest galaxies in Planck clusters (Smith+, 2023)
Towards discovery of gravitationally lensed explosive transients:
the brightest galaxies in massive galaxy clusters from Planck-SZ2
Smith J. C., Ryczanowski D., Bianconi M., Cristescu D., Harisankar S.,
Hawkins S., James M.L., Ridley E.J., Wooding S., Smith G.P.
<Research Notes of the AAS, 7, 51 (2023)>
=2023RNAAS...7...51S 2023RNAAS...7...51S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Gravitational lensing ; Galaxy catalogs
Keywords: galaxy cluster - gravitational lensing - galaxies
Abstract:
We combine the Planck-SZ2 galaxy cluster catalogue with near-infrared
photometry of galaxies from the VISTA Hemisphere Survey to identify
candidate brightest cluster galaxies (BCGs) in 306 massive clusters in
the Southern skies at redshifts of z>0.1. We find that 91% of these
clusters have at least one candidate BCG within the 95% confidence
interval on the cluster centers quoted by the Planck collaboration,
providing reassurance that our analyses are statistically compatible,
and find 92% to be reasonable candidates following a manual
inspection. We make our catalog publicly available to assist
colleagues interested in multi-wavelength studies of cluster cores,
and the search for gravitationally lensed explosive transients in
upcoming surveys including the Legacy Survey of Space and Time by the
Vera C. Rubin Observatory.
Description:
We use data from the VISTA hemisphere Survey (VHS, McMahon et al.,
2013Msngr.154...35M 2013Msngr.154...35M, Cat. II/359) to construct a list of two candidate
Brightest Central Galaxies (BCGs) for 306 galaxy clusters from the
second Planck Sunyaev-Zeldovich cluster catalogue (PSZ2, Planck
Collaboration et al., 2016A&A...594A..27P 2016A&A...594A..27P, Cat. J/A+A/594/A27). We are
confident that the automated identification of BCG candidates is
feasible for all 275 clusters where the predicted value of L* at the
cluster redshift is brighter than the VHS 5-sigma limit, as they show
convincing evidence of a red sequence ridge line of cluster members. A
further 6 clusters have convincing ridge lines of cluster members at a
(J-K) color that is discrepant with the redshift listed in the PSZ2
catalogue. In these cases, we forego the Planck redshift and instead
infer a new redshift from these ridge lines, and use this to select
BCG candidates. These clusters are flagged in the 'Comment' column,
with the inferred redshift provided in the 'AltZ' column. The
remaining 25 clusters with less certain BCG candidates are identified
via the additional 'Comment' flag. Relevant data for each cluster from
the PSZ2 catalogue is also provided. See paper for further
information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 461 306 VHS data of first and second brightest galaxies
of 306 PSZ2 clusters
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See also:
II/359 : VISTA Hemisphere Survey (VHS) catalog DR4.1 (McMahon+, 2013)
J/A+A/594/A27 : Planck Sunyaev-Zeldovich sources (PSZ2) (Planck+, 2016)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Index [1/306] Index of cluster in this catalog
5- 8 I4 --- PSZ2Index [3/1651] Index of cluster in PSZ2
10- 27 A18 --- PSZ2Name Name of cluster in PSZ2 catalog
29- 39 F11.7 deg RAdeg PSZ2 right-ascension of cluster (J2000)
41- 51 F11.7 deg DEdeg PSZ2 declination of cluster (J2000)
53- 60 F8.6 arcmin ePos [0.96/7.23] PSZ2 error radius of cluster
62- 69 F8.6 --- z [0.1/0.87] PSZ2 redshift of cluster
71- 76 F6.3 --- Altz [0/0.3]?=-1 Alternative redshift based
on red sequence colour (1)
78- 86 F9.6 10+14Msun MassEst [2.16/16.12] PSZ2 cluster mass estimate
88- 95 F8.6 10+14Msun e_MassEst [0.19/0.78] PSZ2 error on mass estimate
of cluster
97-104 F8.5 --- SNR [4.5/35.02] PSZ2 cluster signal-to-noise
106-117 I12 --- ID1 VHS ID of brightest galaxy
119-138 F20.16 deg RA1deg VHS right-ascension of brightest galaxy
(J2000)
140-159 F20.16 deg DE1deg VHS declination of brightest galaxy
(J2000)
161-178 F18.15 --- Jmag1 [12.85/19.34] VHS J-magnitude of
brightest galaxy
180-200 F21.19 --- e_Jmag1 [0.0/0.32] VHS error on J-magnitude of
brightest galaxy
202-219 F18.15 --- Ksmag1 [11.85/16.54] VHS Ks-magnitude of
brightest galaxy
221-241 F21.19 --- e_Ksmag1 [0.0/0.12] VHS error on Ks-magnitude of
brightest galaxy
243-260 F18.16 --- J-Ks1 [1.0/1.71] Calculated J-Ks of
brightest galaxy using VHS data
262-282 F21.19 --- e_J-Ks1 [0.0/0.13] VHS error on Petrosian J-Ks of
brightest galaxy
284-295 I12 --- ID2 VHS ID of second brightest galaxy
297-316 F20.16 deg RA2deg VHS right-ascension of
second brightest galaxy (J2000)
318-337 F20.16 deg DE2deg VHS declination of
second brightest galaxy (J2000)
339-356 F18.15 --- Jmag2 [13.13/18.5] VHS J-magnitude of
second brightest galaxy
358-378 F21.19 --- e_Jmag2 [0.0/0.33] VHS error on J-magnitude of
second brightest galaxy
380-397 F18.15 --- Ksmag2 [12.18/16.72] VHS Ks-magnitude of
second brightest galaxy
399-418 F20.18 --- e_Ksmag2 [0.0/0.16] VHS error on Ks-magnitude of
second brightest galaxy
420-437 F18.16 --- J-Ks2 [0.93/1.69] Calculated J-Ks of
second brightest galaxy using VHS data
439-459 F21.19 --- e_J-Ks2 [0.0/0.16] VHS error on Petrosian J-Ks of
second brightest galaxy
461 A1 --- Com [01234] Integer signifying relevant
information about the cluster (2)
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Note (1): -1 if Planck-SZ2 redshift produces correct red sequence colour
Note (2): Summary of standardised comments as follows:
0 = No comment
1 = Low galactic latitude |b|<20deg
2 = L* within ∼0.1mag (or fainter than) 5-sigma detection limit
3 = Low galactic latitude |b|<20deg AND L* within ∼0.1mag
(or fainter than) 5-sigma detection limit
4 = Red sequence at different colour
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Acknowledgements:
J.C. Smith, jxs1374(at)student.bham.ac.uk
(End) Patricia Vannier [CDS] 16-Feb-2023