J/MNRAS/449/4010 SALT galaxy clusters detected by ACT (Kirk+, 2015)
SALT spectroscopic observations of galaxy clusters detected by ACT and a
Type II quasar hosted by a brightest cluster galaxy.
Kirk B., Hilton M., Cress C., Crawford S.M., Hughes J.P., Battaglia N.,
Bond J.R., Burke C., Gralla M.B., Hajian A., Hasselfield M., Hincks A.D.,
Infante L., Kosowsky A., Marriage T.A., Menanteau F., Moodley K.,
Niemack M.D., Sievers J.L., Sifon C., Wilson S., Wollack E.J., Zunckel C.
<Mon. Not. R. Astron. Soc., 449, 4010-4026 (2015)>
=2015MNRAS.449.4010K 2015MNRAS.449.4010K (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Redshifts
Keywords: galaxies: clusters: general -
galaxies: clusters: individual: ACT-CL J0320.4+0032 -
quasars: general - cosmology: observations
Abstract:
We present Southern African Large Telescope follow-up observations of
seven massive clusters detected by the Atacama Cosmology Telescope
(ACT) on the celestial equator using the Sunyaev-Zel'dovich (SZ)
effect. We conducted multi-object spectroscopic observations with the
Robert Stobie Spectrograph in order to measure galaxy redshifts in
each cluster field, determine the cluster line-of-sight velocity
dispersions, and infer the cluster dynamical masses. We find that the
clusters, which span the redshift range 0.3<z<0.55, range in
mass from (5-20)x1014M☉ (M200c). Their masses,
given their SZ signals, are similar to those of Southern hemisphere
ACT clusters previously observed using Gemini and the VLT. We note
that the brightest cluster galaxy in one of the systems studied,
ACT-CL J0320.4+0032 at z=0.38, hosts a type II quasar. Only a
handful of such systems are currently known, and therefore ACT-CL
J0320.4+0032 may be a rare example of a very massive halo in which
quasar-mode feedback is actively taking place.
Description:
The clusters targeted for SALT observations were drawn from the
SZ-selected sample constructed by the ACT team. ACT is a 6m telescope
located in northern Chile that observes the sky in three frequency
bands (centred at 148, 218, and 277GHz) simultaneously with arcminute
resolution.
We conducted observations of the seven target ACT clusters with RSS in
multi-object spectroscopy (MOS) mode, which uses custom designed slit
masks.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 55 40 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J0320.4+0032 measured using SALT RSS
tablea1.dat 55 28 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J0045.2-0152 measured using SALT RSS
tablea2.dat 55 27 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J0156.4-0123 measured using SALT RSS
tablea3.dat 55 20 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J0219.9+0129 measured using SALT RSS
tablea4.dat 55 28 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J0342.7-0017 measured using SALT RSS
tablea5.dat 55 39 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J0348.6-0028 measured using SALT RSS
tablea6.dat 55 24 Spectroscopic redshifts of galaxies in the direction
of ACT-CL J2058.8+0123 measured using SALT RSS
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Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID ID number
5 A1 --- Mask [1234S] Mask number or S (1)
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 18 F6.3 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000)
33- 37 F5.2 mag rmag SDSS r magnitude
39- 44 F6.4 --- z Redshfit
46 I1 --- q_z [3/4] Redshift quality flag (see Sect. 2.4) (2)
48 A1 --- EmLine [V-] V indicates objects which show emission
lines in their spectra
(e.g. [OII] λ3727)
50 A1 --- Memb [V-] V indicates objects which are determined
to be cluster members (see Section 3.2)
52- 55 F4.2 Mpc r ? Projected distance from the BCG position
as given in Menanteau et al.
(2013ApJ...765...67M 2013ApJ...765...67M)
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Note (1): Member galaxies in Mask 'S' have redshifts from SDSS DR10
(Ahn et al., 2014ApJS..211...17A 2014ApJS..211...17A).
Note (2): Redshift quality flag as follows:
3 = galaxies exhibiting a single, strongly detected feature
4 = galaxies exhibiting multiple absorption and/or emission features
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Jan-2016