J/MNRAS/432/62 PS1 MDS X-ray selected galaxy clusters (Ebeling+, 2013)
X-ray selected galaxy clusters in the Pan-STARRS Medium Deep Survey.
Ebeling H., Edge A.C., Burgett W.S., Chambers K.C., Hodapp K.W.,
Huber M.E., Kaiser N., Price P.A., Tonry J.L.
<Mon. Not. R. Astron. Soc., 432, 62-72 (2013)>
=2013MNRAS.432...62E 2013MNRAS.432...62E
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: galaxies: clusters: general - X-rays: galaxies: clusters
Abstract:
We present the results of a pilot study for the extended Massive
Cluster Survey (eMACS), a comprehensive search for distant, X-ray
luminous galaxy clusters at z>0.5. Our pilot study applies the eMACS
concept to the 71deg2 area extended by the 10 fields of the
Pan-STARRS1 (PS1) Medium Deep Survey (MDS). Candidate clusters are
identified by visual inspection of PS1 images in the g, r, i and z
bands in a 5x5arcmin2 region around X-ray sources detected in the
ROSATAll-Sky Survey (RASS).
Description:
Our strategy for the identification of galaxy clusters at z>0.5 from
these data sets is brute force: we select all X-ray sources listed in
the RASS BSC and FSC that fall within our study area, and then examine
PS1 images in the gP1, rP1, iP1 and zP1 bands in a 5x5arcmin2 region
around the X-ray source position. Candidate clusters at intermediate
to high redshift (z≳0.3) are readily identifiable as pronounced
overdensities of faint, red galaxies. In order to prevent seemingly
blank fields from erroneously being classified as potentially very
distant clusters, we also query NASA Extragalactic Database (NED) for
known celestial objects within 2-arcmin radius of the respective X-ray
source, a process that eliminates large numbers of active galactic
nuclei (AGN) and quasi-stellar objects (QSOs).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 56 165 Galaxy redshifts obtained with Keck-II/DEIMOS
during our eMACS extended Massive Cluster Survey)
pilot study
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Cluster Cluster name (1)
20- 23 A4 --- Gal Galaxy name (in Cluster)
25 A1 --- f_Gal [Nc] indicates a change in table at CDS (2)
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 36 F5.2 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 48 F4.1 arcsec DEs Declination (J2000)
50- 55 F6.4 --- z [0.1/2.003] Galaxy redshift
56 A1 --- Note [a] a for QSO/type 1 AGN (broad emission lines)
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Note (1): General informations on Clusters:
eMACS J0840.2+4421 : nz = 30, z = 0.6393, σ=1310+125-205
RX J0959.0+0255 : nz = 21, z = 0.3494, σ=590+90-100
eMACS J1057.5+5759 : nz = 26, z = 0.5978, σ=860+100-170
eMACS J1419.2+5326 : nz = 32, z = 0.6384, σ=1020+80-120
RX J1613.7+5542 : nz = 9, z = 0.3512, σ=590
Note (2): this flag has the following meaning:
c = coordinates added (for g*s galaxies)
N = name changed (2 galaxies are named RX J1613.7+5542-g7 in the original
table; the one with redshift 0.3498 was renamed RX J1613.7+5542-g9,
and similarly RX J1613.7+5542-g7s was renamed RX J1613.7+5542-g9s.
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History:
* 06-Nov-2014: From electronic version of the journal
* 22-Dec-2014: position added for g*s galaxies, and two names were
changed (see the Note (2) above)
(End) Patricia Vannier [CDS] 06-Nov-2014