X-RAY%20FOLLOW-UP%20OF%20STRONG%20LENSING%20OBJECTS:%20SL2S%20GROUPS%20(AND%20A1703)

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X-RAY FOLLOW-UP OF STRONG LENSING OBJECTSSL2S
GROUPS (AND A1703)
FABIO GASTALDELLO (IASF-MILAN, UCI) M. LIMOUSIN
THE SL2S COLLABORATION
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OUTLINE

• INTRODUCTION TO GROUPS IN SL2S
• XMM SNAPSHOT PROGRAM FOR X-RAY FOLLOW-UP OF SL2S
  GROUPS DETECTIONS AND PRELIMINARY INITIAL
  INFORMATION
• THE BULLET GROUP
• A1703

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IMAGE SEPARATION DISTRIBUTION OF SL
GALAXY GROUPS POOR CLUSTERS WITH IMAGE
SEPARATION IN THE RANGE 6-16 HAVE BEEN SCARCELY
REPORTED
OGURI 2006
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IMAGE SEPARATION DISTRIBUTION OF SL
NO 6-15 IMAGE SEPARATION LENSES IN THE CLASS
SURVEY (PHILLIPS01,McKEAN10)
OGURI 2006
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SL2S GROUPS

• INITIAL SAMPLE OF 13 OBJECTS, A SUBSAMPLE OF THE
  SL2S BASED ON MULTI-COLOUR CFHTLS, IDEAL TO
  DETECT SL FEATURES AND FOLLOW-UP HUBBLE IMAGING
  (z 0.3-0.8)
• LUMINOSITY MAPS BASED ON LIGHT DISTRIBUTION OF
  ELLIPTICALS HAVE FOR SOME OBJECTS COMPLICATED
  SHAPE. WEAK LENSING SIGNAL DETECTED FOR 6 GROUPS

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SL2S GROUPS
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X-RAY FOLLOW-UP

• CLEARLY DIFFICULT BECAUSE WE ARE TARGETING LOW
  FLUX OBJECTS, HOWEVER MORE MASSIVE OBJECTS THAN
  PREVIOUS STUDIES (E.G., LARGEST IMAGE SEPARATION
  IN FASSNACHT08 IS CLASS B2108213 WITH RE
  2.5)
• XMM SNAPSHOTS OF 5-10 ks TO SECURE FLUXES FOR
  DEEPER CHANDRA OBSERVATION. ENOUGH PHOTONS FOR
  MORPHOLOGY AND POSSIBLY TEMPERATURE

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SL2SJ09013-0158 z 0.30 (PHOT) STRAIGHT ARC
BETWEEN THE TWO GALAXIES SL RE 6.8
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SL2SJ09013-0158
TWO GROUPS DETECTED, THE N-ONE CONSISTENT WITH
THE ELONGATION IN LUMINOSITY CONTOURS. THE S-ONE
ASSOCIATED WITH THE LENS HAS A TEMPERATURE
CONSISTENT WITH A POOR CLUSTER kT 3.4 0.6 keV
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SL2SJ09013-0158
CLEARLY EXTENDED SOURCE (rc 150 60 kpc, 34
13, ß 0.58 0.12)
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SL2SJ22214-0053 z 0.334 STRAIGHT ARC BETWEEN
THE TWO GALAXIES SL RE 6.830.15
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SL2SJ22214-0053
JUST A POINT SOURCE DETECTED, HOWEVER VERY
SHALLOW XMM EXPOSURE (5 KS)
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SL2SJ09413-1100 z 0.385 EXTENDED STELLAR HALO
FOR CENTRAL GALAXY SL RE 7.500.81
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SL2SJ09413-1100
RATHER REGULAR X-RAY EMISSION TEMPERATURE OF
KT3.60.4
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SL2SJ09413-1100
CLEARLY EXTENDED SOURCE
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SL2SJ02140-0532 z 0.444 MULTIPLE IMAGES
(SOUTHERN ARC MAYBE NOT ASSOCIATED) SL RE 7.3
0.5
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SLWLGALAXY DYNAMICS (VERDUGO11) UNIMODAL NFW
W/ c_200 6.00.6 AND M_200 1.0 x 1014
REPRODUCES WELL ALL THE CONSTRAINTS
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SL2SJ02140-0535
EVIDENCE FOR A SINGLE HALO FIT A SINGLE HALO IN
SL, NO OPTICAL SUBSTRUCTURE (MUNOZ11, IN
PREP) X-RAY EXTENDED BUT NOT ENOUGH COUNTS FOR
SPECTRAL INFORMATION
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SL2SJ08544-0053 z 0.351 BIMODAL LUMINOSITY
DISTRIBUTION (TWO DISTRINCT SUBGROUPS FROM
SPECTROSCOPY WITH A VELOCITY DIFFERENCE OF 1200
km/s, MUNOZ12, IN PREP.). PERTURBED LENSING
CONFIGURATION WHICH REQUIRES EXTERNAL MASS
(LIMOUSIN10) SL RE 5.5 0.1
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(No Transcript)
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SL2SJ08544-0053
ELONGATED X-RAY EMISSION TEMPERATURE OF
KT2.70.4
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SL2SJ08544-0053
CLEARLY EXTENDED SOURCE (rc 128 56 kpc, 26
11, ß 0.52 0.07)
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SL2SJ08544-0053THE BULLET GROUP
SEPARATION BETWEEN X-RAY GAS AND GALAXIES
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THE BULLET GROUP
SEPARATION BETWEEN THE X-RAY PEAK AND THE GALAXY
ASSOCIATED WITH THE LENS OF 22 (109 Kpc)
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WHY LOOKING FOR BULLETS ?
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Intra-cluster medium (ICM) Thermal plasma X-rays
(10-30)
Galaxies (5)
Dark Matter Gravitational potential
1E 0657-156 THE BULLET CLUSTER
MARKEVITCH04
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CONSTRAINTS ON DM SELF-INTERACTION CROSS SECTION
RANDALL08
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BABY BULLET (MACS J0025)
BRADAC08
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SL2S J08544
SL2S J08544
SHAN10
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ABELL 1703
LIMOUSIN08 RICHARD09
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ABELL 1703
RICHARD09
UNIMODAL REGULAR CLUSTER
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ABELL 1703
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ABELL 1703
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ABELL 1703
TEMPERATURE OF KT7.91.2 keV
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SUMMARY

• SL2S IS FINALLY PROVIDING A GOOD SAMPLE OF
  LENSING GROUPS/POOR CLUSTERS, OPENING A NEW
  WINDOW OF THE MASS SPECTRUM FOR LENSING/X-RAY
  COMPARISON
• STAY TUNED FOR MORE TARGETS AND MORE DATA THE
  GOAL IS TO OBTAIN CHANDRA OBSERVATIONS TO ALLOW
  X-RAY HE MASS RECONSTRUCTION, AS DONE FOR LOCAL
  (z lt 0.1) GROUPS (GASTALDELLO07)
• THE BULLET GROUP IS THE FIRST GROUP MASS-SIZE
  EXAMPLE OF A BULLET AND A GOOOD PROMISE FOR A
  STATISTICAL DETECTION OF BULLETICITY (Massey11)
• A1703 IS REALLY AN EXCEPTIONAL TARGET AND WE HOPE
  TO GET BETTER X-RAY DATA WITH CHANDRA

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SL2SJ02254-0737 z 0.511 RADIO SOURCE COINCIDENT
WITH CENTRAL GALAXY SL RE 6.0 0.3
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SL2SJ08591-0345 z 0.647 VERY EXOTIC SL
CONFIGURATION, DIFFICULT TO KNOW HOW MANY
MULTIPLE IMAGES ARE OBSERVED SL RE 8
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IMAGE SEPARATION OF SL

• Fraction of lensing by satellites peaks at 1 and
  decreases rapidly with increasing image
  separation
• 14 and 4 percent of lenses in groups and
  clusters, half of them expected to be by
  satellites
• Separation enhanced significantly by surrounding
  haloes