J/ApJ/838/110 Spectroscopic survey of ZwCl 0008.8+5215 (Golovich+, 2017)
MC2: multiwavelength and dynamical analysis of the merging galaxy cluster
ZwCl 0008.8+5215: an older and less massive Bullet Cluster.
Golovich N., van Weeren R.J., Dawson W.A., Jee M.J., Wittman D.
<Astrophys. J., 838, 110-110 (2017)>
=2017ApJ...838..110G 2017ApJ...838..110G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts ; Spectroscopy ; Photometry, RI
Keywords: galaxies: clusters: individual (ZwCl 0008.8+5215);
galaxies: clusters: intracluster medium; gravitational lensing: weak;
large-scale structure of universe; X-rays: galaxies: clusters
Abstract:
We present and analyze a rich data set including Subaru/SuprimeCam,
HST/Advanced Camera for Surveys and Wide Field Camera 3, Keck/DEIMOS,
Chandra/ACIS-I, and JVLA/C and D array for the merging cluster of
galaxies ZwCl 0008.8+5215. With a joint Subaru+HST weak gravitational
lensing analysis, we identify two dominant subclusters and estimate
the masses to be M200=5.7-1.8+2.8x1014M☉ and
1.2-0.6+1.4x1014M☉. We estimate the projected separation
between the two subclusters to be 924-206+243kpc. We perform a
clustering analysis of spectroscopically confirmed cluster member
galaxies and estimate the line-of-sight velocity difference between
the two subclusters to be 92±164km/s. We further motivate, discuss,
and analyze the merger scenario through an analysis of the 42ks of
Chandra/ACIS-I and JVLA/C and D array polarization data. The X-ray
surface brightness profile reveals a merging gas-core reminiscent of
the Bullet Cluster. The global X-ray luminosity in the 0.5-7.0keV band
is 1.7±0.1x1044erg/s and the global X-ray temperature is
4.90±0.13keV. The radio relics are polarized up to 40% , and along
with the masses, velocities, and positions of the two subclusters, we
input these quantities into a Monte Carlo dynamical analysis and
estimate the merger velocity at pericenter to be 1800-300+400km/s.
This is a lower-mass version of the Bullet Cluster and therefore may
prove useful in testing alternative models of dark matter (DM). We do
not find significant offsets between DM and galaxies, but the
uncertainties are large with the current lensing data. Furthermore, in
the east, the BCG is offset from other luminous cluster galaxies,
which poses a puzzle for defining DM-galaxy offsets.
Description:
We conducted a spectroscopic survey of ZwCl 0008 with the DEIMOS
spectrograph on the Keck II telescope over three separate observing
runs (2013 January 16, July 14, and September 5); central wavelength
of 6700Å and spectral resolution of ∼1Å (50km/s).
ZwCl 0008 was observed with Subaru/SuprimeCam in two filters. In g,
the total integration time was 720s, consisting of four 180s
exposures. In r, the total integration time was 2880s, consisting of
eight 360s exposures.
Two subfields (see Figure 2) of ZwCl 0008 were observed with HST using
both Advanced Camera for Surveys (ACS) and WFC3 in parallel during the
2013 October 10 and 2014 January 24 periods under the program
HST-GO-13343. Each region was imaged with two orbits of ACS/F814W and
two orbits of WFC3/F606W.
We obtained 42ks of Chandra/ACIS-I observations of ZwCl 0008 (ObsID:
15318, 17204, 17205) during Cycles 14 and 16. The final
exposure-corrected image was made in the 0.5-2.0keV band.
ZwCl 0008 was observed with the Jansky Very Large Array in D-array and
C-array. All four correlation products were recorded in the 2-4GHz
S-band in 2015 Oct 19 and 2014 Oct 9.
Objects:
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RA (ICRS) DE Designation(s) (z)
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00 11 25.6 +52 31 41 ZwCl 0008+5215 = ZwCl 0008+5215 (z=0.104)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 118 202 High quality DEIMOS galaxies
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
II/261 : GOODS initial results (Giavalisco+, 2004)
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009)
J/A+A/549/A8 : Atm. extinction properties above Mauna Kea (Buton+, 2013)
J/ApJ/772/131 : Musket Ball Cluster redshift catalog (Dawson, 2013)
J/A+A/580/A95 : Planck/AMI Sunyaev-Zel'dovich measurements (Perrott+, 2015)
J/ApJ/805/143 : MC2: redshift analysis of CIZA J2242.8+5301 (Dawson+, 2015)
J/MNRAS/450/630 : MC2: SFR in CIZA J2242.8+5301 (Sobral+, 2015)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.6 deg RAdeg Right Ascension in decimal degrees (J2000)
10- 17 F8.5 deg DEdeg Declination in decimal degrees (J2000)
19- 26 F8.6 --- zsp [0.06/1.2] Spectroscopic redshift (1)
28- 35 E8.2 --- e_zsp [/0.0002] Uncertainty in zsp
37- 40 F4.1 mag rmag [13.6/23] Subaru/SuprimeCam r-band magnitude
42-118 A77 --- Notes Spectral notes
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Note (1): Of the galaxies, six are foreground galaxies, 80 are background
galaxies, and 117 fall between 0.093≤z≤0.115, which is
zcluster±3000km/s, where zcluster=0.104.
This range is ~±3σ, where σ is the velocity dispersion.
These 117 galaxies are considered cluster members.
See section 3.1.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 31-Oct-2017