Galaxy Galaxy Lensing in CLASH clusters
description
Transcript of Galaxy Galaxy Lensing in CLASH clusters
Elinor Medezinski
Johns Hopkins University
Galaxy Galaxy Lensing in CLASH clusters
E. Medezinski - CLASH team meeting
Galaxy-Galaxy LensingDynamical methods work well within optical radius r < 20 kpc
Galaxy-Galaxy lensing is a unique method to probe galaxy Dark Matter Halos out to large radii
100 h-1kpc ~ 200 h-1kpc
Stacking background galaxies inside aperture around cluster galaxy gives mass of galaxy lens
Averaging over many cluster galaxies within cluster annulus averages out cluster contribution
One can then deduce:M/L ratios of galaxiesTruncation of galaxies in different part of clusters
aperture
cluster
E. Medezinski - CLASH team meeting
B-R vs. R-z’ selected samples
E. Medezinski - CLASH team meeting
Truncated Singular Isothermal Sphere (TSIS) density profile
2sin2cos)(1
)()(1
4
,rrfor 0
rrfor cos14
242
rrfor 0
rrfor 2
21
2
t
t1
2
2
22
2
2
2
2
ggrgrrr
rrrg
DDD
Gc
rr
rDDD
crr
GRdrr
GrM
Grr
LSL
scrit
tS
LSLv
crit
tvvsubhalo
t
tv
TSIS
Marginalize over parameter space to find best-fit V,Rt,,
Exclude inner 20-30 kpc/h from fit
E. Medezinski - CLASH team meeting
MCMC analysis
E. Medezinski - CLASH team meeting
MACSJ1206 MCMC results0.1Rvir<R<0.6Rvir
0.6Rvir<R<1.1Rvir
1.1Rvir<R<1.8Rvir
1.8Rvir<R<2.8Rvir
Exclude inner cluster core where strong contribution from cluster lensingHalo truncated outside R>Rvir
E. Medezinski - CLASH team meeting
Halo properties vs. Cluster radius – MACSJ1206
Truncation radius galaxy type
Mass Luminosity M/L
E. Medezinski - CLASH team meeting
Use specstroscopic redshifts to reliably select a subsample of cluster galaxies.
Two main clouds – red and blue cluster galaxies
Spec-z selected samples
E. Medezinski - CLASH team meeting
Red galaxies clustered, blue galaxies not clustered – do they belong to the cluster?
Number density profiles
E. Medezinski - CLASH team meeting
Red cluster g-gMass Luminosity M/L
Truncation radius galaxy type
E. Medezinski - CLASH team meeting
Blue cluster (?) g-gMass Luminosity M/L
Truncation radius galaxy type
A2261 Results – CC selected sample
E. Medezinski - CLASH team meeting
Truncation radius galaxy type
Mass Luminosity M/L
E. Medezinski - CLASH team meeting
A2261 BVR from Subaru, i'z' from KPNO – shallow.
galaxy type
Red cl. Blue cl.
Mass
Luminosity
M/L
Truncation radius galaxy type
Luminosity
Truncation radius
M/L
Mass
E. Medezinski - CLASH team meeting
A383
Problems – not as deep (old reduction of Mario) l.o.s stuctures, cluster substructure No spec-z's redshifts of cluster galaxies
A370 ZwCl0024
E. Medezinski - CLASH team meeting
Natarajan et al. 2009
E. Medezinski - CLASH team meeting
Next steps More clusters with more spectro-selected cluster
galaxies Use 2D multi-halo model to subtract cluster
lensing contribution Incorporate HST shapes in centeral bins Try other galaxy mass models? NFW? Stack several clusters for better statistics Divide by stellar mass, local density, type etc. to
get information on the galactic halo in different enviroments