J/MNRAS/478/4952 SPIDERS BCGs gri photometry (Furnell+, 2018)
Exploring relations between BCG and cluster properties in the
SPectroscopic IDentification of eROSITA Sources survey from 0.05 <z < 0.3.
Furnell K.E., Collins C.A., Kelvin L.S., Clerc N., Baldry I.K.,
Finoguenov A., Erfanianfar G., Comparat J., Schneider D.P.
<Mon. Not. R. Astron. Soc., 478, 4952-4973 (2018)>
=2018MNRAS.478.4952F 2018MNRAS.478.4952F (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts ; Photometry, SDSS ;
Velocity dispersion ; Morphology
Keywords: galaxies: clusters: general -
galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: structure
Abstract:
We present a sample of 329 low-to intermediate-redshift (0.05<z<0.3)
brightest cluster galaxies (BCGs) in X-ray-selected clusters from the
SPectroscopic IDentification of eRosita Sources survey, a
spectroscopic survey within Sloan Digital Sky Survey-IV (SDSS-IV). We
define our BCGs by simultaneous consideration of legacy X-ray data
from ROSAT, maximum-likelihood outputs from an optical cluster-finder
algorithm and visual inspection. Using SDSS imaging data, we fit
Sersic profiles to our BCGs in three bands (g, r, i) with SIGMA a
GALFIT-based software wrapper. We examine the reliability of our fits
by running our pipeline on ∼104 point spread function-convolved
model profiles injected into eight random cluster fields; we then use
the results of this analysis to create a robust subsample of 198 BCGs.
We outline three cluster properties of interest: overall cluster X-ray
luminosity (LX), cluster richness as estimated by REDMAPPER
(λ),and cluster halo mass (M200), which is estimated via
velocity dispersion. In general, there are significant correlations
with BCG stellar mass between all three environmental properties, but
no significant trends arise with either Sersic index or effective
radius. There is no major environmental dependence on the strength of
the relation between effective radius and BCG stellar mass. Stellar
mass therefore arises as the most important factor governing BCG
morphology. Our results indicate that our sample consists of a large
number of relaxed, mature clusters containing broadly homogeneous BCGs
up to z∼0.3, suggesting that there is little evidence for much
ongoing structural evolution for BCGs in these systems.
Description:
This work makes use of observations primarily from two separate
sources: X-ray observations from the ROSAT All-Sky Survey (RASS), a
shallow, low signal-to-noise ratio, all-sky survey of soft X-ray
sources running between 1990 and 1999 (Voges et al.
1999A&A...349..389V 1999A&A...349..389V, Cat. IX/10) and optical data from the Sloan
Digital Sky Survey (SDSS; York et al., 2000AJ....120.1579Y 2000AJ....120.1579Y). The
spectroscopic data for this work originate from the SDSS-IV (Blanton
et al., 2017AJ....154...28B 2017AJ....154...28B) SPectroscopic IDentification of eRosita
Sources (SPIDERS) survey, which aims to investigate ∼104 X-ray
targets detectable by eROSITA prior to launch in 2018.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 602 329 Parameters used in this study
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See also:
J/A+A/636/A97 : SDSS-IV/SPIDERS X-ray PS Spectroscopic Catalog (Comparat+ 2020)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- SPIDERS Unique cluster ID from SPIDERS
9- 19 F11.7 deg RAdeg Right ascension of BCG (J2000)
21- 33 F13.9 deg DEdeg Declination of BCG (J2000)
35- 45 F11.9 --- zBCG Spectroscopic redshift of BCG
47- 59 E13.8 --- e_zBCG Error on spectroscopic redshift of BCG
61- 80 F20.18 --- zRM Photometric redshift of cluster red sequence
from redMaPPer
82-102 F21.19 --- e_zRM Error on photometric redshift of cluster red
sequence from redMaPPer
104-114 F11.9 --- zcl ?=- Spectroscopic cluster redshift,
estimated from biweight of cluster members
116-126 F11.9 --- E_zcl Upper error bound on spectroscopic cluster
redshift
128-138 F11.9 --- e_zcl Lower error bound on spectroscopic cluster
redshift
140-149 F10.5 km/s sigma200 ?=- Velocity dispersion of cluster
151-160 F10.5 km/s E_sigma200 Upper error bound on velocity dispersion of
cluster
162-171 F10.5 km/s e_sigma200 Lower error bound on velocity dispersion of
cluster
173-176 F4.1 --- N ?=- Number of cluster members used when
computing velocity dispersion
178-196 F19.15 --- alpha Cluster richness estimator from redMaPPer
198-206 E9.5 10-7W LX/Ez Cluster X-ray luminosity from ROSAT
208-217 F10.7 [Msun] log10MBCG ?=- Stellar mass of BCG
219-230 F12.10 [Msun] e_log10MBCG Error on stellar mass of BCG
232-241 F10.8 mag g-i ?=- k-corrected, dust-corrected, g-i colour
of BCG, measured in a 30 kpc aperture
243-254 F12.10 mag e_g-i Error on g-i colour of BCG
256-262 F7.4 mag gmag g-band apparent magnitude from SIGMA
264-269 F6.4 mag e_gmag Error on g-band apparent magnitude from SIGMA
271-285 F15.10 arcsec Reg Effective radius of BCG from SIGMA, g band
287-300 F14.10 arcsec e_Reg Error on effective radius of BCG from
SIGMA, g band
302-308 F7.4 --- ng Sersic index of BCG from SIGMA, g band
310-316 F7.4 --- e_ng Error on Sersic index of BCG from
SIGMA, g band
318-323 F6.4 --- b/ag Axis ratio from SIGMA, g band
325-330 F6.4 --- e_b/ag Error on axis ratio from SIGMA, gband
332-349 F18.14 deg thetag Position angle from SIGMA, g band
351-358 F8.4 deg e_thetag Error on position angle from SIGMA, g band
360-369 F10.7 --- chi2g Reduced χ2, g band
371-377 F7.4 mag rmag r-band apparent magnitude from SIGMA
379-384 F6.4 mag e_rmag Error on r-band apparent magnitude from SIGMA
386-400 F15.10 arcsec Rer Effective radius of BCG from SIGMA, r band
402-416 F15.10 arcsec e_Rer Error on effective radius of BCG from SIGMA,
r band
418-424 F7.4 --- nr Sersic index of BCG from SIGMA, r band
426-432 F7.4 --- e_nr Error on Sersic index of BCG from SIGMA,
r band
434-439 F6.4 -- b/ar Axis ratio from SIGMA, r band
441-446 F6.4 --- e_b/ar Error on axis ratio from SIGMA, r band
448-466 F19.15 deg thetar Position angle from SIGMA, r band
468-474 F7.4 deg e_thetar Error on position angle from SIGMA, r band
476-485 F10.7 --- chi2r Reduced χ2, r band
487-493 F7.4 mag imag i-band apparent magnitude from SIGMA
495-500 F6.4 mag e_imag Error on i-band apparent magnitude from SIGMA
502-516 F15.10 arcsec Rei Effective radius of BCG from SIGMA, i band
518-532 F15.10 arcsec e_Rei Error on effective radius of BCG from SIGMA,
i band
534-540 F7.4 --- ni Sersic index of BCG from SIGMA, i band
542-548 F7.4 --- e_ni Error on Sersic index of BCG from SIGMA,
i band
550-555 F6.4 --- b/ai Axis ratio from SIGMA, i band
557-563 F7.4 --- e_b/ai Error on axis ratio from SIGMA, i band
565-584 F20.16 deg thetai Position angle from SIGMA, i band
586-591 F6.4 deg e_thetai Error on position angle from SIGMA, i band
593-602 F10.7 --- chi2i Reduced χ2, i band
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Oct-2021