J/ApJ/918/61 The strong-lensing ClG 0440+0204. II. GMOS sp. (Carrasco+, 2021)
Dissecting the strong-lensing galaxy cluster MS 0440.5+0204.
II. New optical spectroscopic observations in a wider area and cluster dynamical
state.
Carrasco E.R., Verdugo T., Motta V., Foex G., Ellingson E., Gomez P.L.,
Falco E., Limousin M.
<Astrophys. J., 918, 61 (2021)>
=2021ApJ...918...61C 2021ApJ...918...61C
ADC_Keywords: Clusters, galaxy; Spectra, optical; Redshifts; Photometry;
Gravitational lensing; Colors
Keywords: Galaxy clusters ; Redshift surveys ; Gravitational lensing
Abstract:
We present an optical study of the strong-lensing galaxy cluster
MS0440.5+0204 at z=0.19593, based on CFHT/MegaCam g', r' photometry
and GMOS/Gemini and CFHT/MOS/SIS spectroscopy in a broader area than
previous works. We have determined new spectroscopic redshifts for the
most prominent gravitational arcs surrounding the central galaxy in
the cluster. The new redshifts and the information provided by the
photometric catalog allow us to perform a detailed weak- and
strong-lensing mass reconstruction of the cluster. The large number of
member galaxies and the area covered by our observations allow us to
estimate more accurately the velocity dispersion and mass of the
cluster and to examine in detail the nature of the cluster and
surrounding structures. The dynamical mass is in good agreement with
the mass inferred from the lensing analysis and X-ray estimates. About
68% of the galaxies are located in the inner ≲0.86h70-1Mpc region
of the cluster. The galaxy redshift distribution in the inner region
of the cluster shows a complex structure with at least three
substructures along the line of sight. Other substructures are also
identified in the galaxy density map and in the weak-lensing mass map.
The member galaxies in the northeast overdensity are distributed in a
filament between the clusters MS 0440.5+0204 and ZwCL 0441.1+0211,
suggesting that these two structures might be connected. MS0440.5+0204
appears to be dynamically active, with a cluster core that is likely
experiencing a merging process, and with other nearby groups at
projected distances of ≲1h70-1Mpc that could be being accreted by
the cluster.
Description:
The images and spectroscopic data were obtained with the Gemini
Multi-Object Spectrograph (GMOS) mounted at the Gemini South telescope
in Chile.
The central 5.5'x5.5' region of the galaxy cluster MS0440.5+0204 was
observed with the g' (3x300s exposures), r' (3x200s exposures), and i'
filters (3x200s exposures) on 2011 November 12 UT (program
ID: GS-2011B-Q-59).
The GMOS multiobject observations were carried out a year later,
between 2013 January 13 and February 4 UT (Program ID: GS-2012B-Q-53).
The MS 0440.5+0204 cluster was observed with MegaCam at CFHT as part
of the Canadian Cluster Comparison Project (CCCP;
Hoekstra+ 2012MNRAS.427.1298H 2012MNRAS.427.1298H & Mahdavi+ 2013ApJ...767..116M 2013ApJ...767..116M), using
the g' and r' filters. The images were reprocessed. See Section 2.2.
We obtained J band data with the SofI camera on the New Technology
Telescope at the European Southern Observatory (ESO), La Silla
Observatory in Chile. The observation was carried out on
1998-October-29 (PROG=62.O-0143, ID=4271). See Section 2.3.
In order to increase the number of galaxies with confirmed
spectroscopic redshifts to be used in the dynamical analysis, the 97
measured GMOS redshifts were combined with the 57 spectroscopic
redshifts reported by G98 (Gioia+ 1998ApJ...497..573G 1998ApJ...497..573G) and with the
113 unpublished spectroscopic redshifts obtained by
Yee+ (1996ApJS..102..269Y 1996ApJS..102..269Y) as part of the CNOC cluster Redshift Survey
(Carlberg+ 1994JRASC..88...39C 1994JRASC..88...39C). The spectroscopic observations were
conducted at CFHT using the MOS/SIS multiobject spectrograph,
covering an area of ∼0.45°x0.14° (∼5.3x1.6h70-2Mpc2 in
the cluster rest frame). See Section 2.4.
Throughout this work we adopt the following cosmological parameters:
ΩM=0.3, ΩΛ=0.7, and H0=70h70.km.s-1.Mpc1^.
With this cosmology 1" corresponds to 3.24h70-1kpc at the redshift
of the cluster (z=0.196).
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
04 43 09.69 +02 10 18.9 MS 0440.5+0204 = ClG 0440+0204
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 113 258 Galaxy redshifts
--------------------------------------------------------------------------------
See also:
B/cfht : Log of CFHT Exposures (CADC, 1979-)
IX/15 : Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)
B/eso : ESO Science Archive Catalog (ESO, 1991-2022)
J/ApJS/133/1 : GIS catalog project : source catalog (Ueda+, 2001)
J/AJ/132/1796 : Spectroscopy in nearby group cores (Carrasco+, 2006)
J/ApJ/664/777 : Multiwavelength study of RX J1117.4+0743 (Carrasco+, 2007)
J/ApJ/668/643 : Multiply imaged gravitational lens systems (Limousin+, 2007)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/ApJ/762/L30 : CLASH: MCS J0416.1-2403 analysis (Zitrin+, 2013)
J/ApJ/783/52 : Redshifts in the field of A383 (Geller+, 2014)
J/ApJ/805/143 : MC2: redshift analysis of CIZA J2242.8+5301 (Dawson+, 2015)
J/MNRAS/446/683 : Free-form lensing grid solution for A1689 (Diego+, 2015)
J/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015)
J/ApJS/224/33 : CLASH-VLT: the cluster MACS J0416.1-2403 (Balestra+, 2016)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 I1 --- Type [0/1]? Galaxy type code (1)
3- 19 A17 --- Name Galaxy name
21- 30 A10 --- ID Internal identifier
32 A1 --- r_z Reference for z (2)
34- 35 I2 h RAh [4]? Hour of Right Ascension (J2000)
37- 38 I2 min RAm [42/44]? Minute of Right Ascension (J2000)
40- 44 F5.2 s RAs ? Second of Right Ascension (J2000)
46 A1 --- DE- [+ ] Sign of the Declination (J2000)
47- 48 I2 deg DEd [2]? Degree of Declination (J2000)
50- 51 I2 arcmin DEm ? Arcminute of Declination (J2000)
53- 56 F4.1 arcsec DEs ? Arcsecond of Declination (J2000)
58- 62 F5.2 mag rpmag [17.49/23.26]? Sloan total r' band AB
magnitude (3)
64- 67 F4.2 mag gp-rp [0.5/1.9]? Sloan (g'-r') color index (3)
69- 75 F7.5 --- z [0.06/0.8] Individual spectroscopic redshift (4)
77- 83 F7.5 --- e_z [3e-5/0.002] Uncertainty in z
85- 88 F4.1 --- R [0/19.5]? Tonry & Davis 1979AJ.....84.1511T 1979AJ.....84.1511T
R value
90- 91 I2 --- Nl [4/16]? Number of emission line used
to derived z
93 I1 --- f_z [0/1] Flag on z (5)
95- 101 F7.5 --- zf [0.068/0.8]? Final redshift (6)
103- 109 F7.5 --- e_zf [0.0002/0.001]? Uncertainty in zf
111- 113 A3 --- Mm Membership flag ("Yes": 90 occurrences or "No")
--------------------------------------------------------------------------------
Note (1): Code as follows:
0 = Primary galaxy sample.
1 = Member galaxies from Gioia+ (1998ApJ...497..573G 1998ApJ...497..573G)
not covered by our observations.
Note (2): Reference as follows:
C = CFHTMOS: CFHT using the MOS/SIS multiobject spectrograph - unpublished
spectroscopic redshifts obtained by Yee+ (1996ApJS..102..269Y 1996ApJS..102..269Y) as part
of the CNOC cluster Redshift Survey (Carlberg+ 1994JRASC..88...39C 1994JRASC..88...39C);
113 occurrences
M = Gemini GMOS observations; 97 occurrences
G = Gioia+ (1998ApJ...497..573G 1998ApJ...497..573G); 48 occurrences.
Note (3): Measured inside a fixed aperture of 1.2 arcsec corrected by galactic
extinction (A(g')=0.587, A(r')=0.406mag) using the reddening maps of
Schlafly & Finkbeiner (2011ApJ...737..103S 2011ApJ...737..103S) and assuming a reddening
law of Rv=3.1 (Fitzpatrick 1999PASP..111...63F 1999PASP..111...63F).
Note (4): Corrected by the zero point.
Note (5): For galaxies with multiple measurements included in the final
weighted redshift. Code as follows:
1 = the individual redshift is included.
0 = the individual redshift is discarded.
Note (6): Corrected to the heliocentric system. For galaxies with multiple
measurements, these values are the mean weighted value.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Verdugo et al. Paper I. 2020ApJ...897....4V 2020ApJ...897....4V
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Jan-2023