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THE BULLET GROUP
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Transcript of THE BULLET GROUP
FABIO GASTALDELLO
INAF-IASF MILAN & UC IRVINE
M. LIMOUSIN, G. FOEX, R. MUNOZ, T. VERDUGO, V. MOTTA, A. MORE, R. CABANAC, D. BUOTE, D. ECKERT, S. ETTORI, A. FRITZ, S. GHIZZARDI, P. HUMPHREY, M. MENEGHETTI,
M. ROSSETTI
THE BULLET GROUP THE BULLET GROUP
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Galaxies Galaxies
Intra-cluster medium (ICM)Intra-cluster medium (ICM)
Thermal plasmaThermal plasma
Dark MatterDark Matter
Gravitational potentialGravitational potential
1E 0657-156 THE BULLET CLUSTER1E 0657-156 THE BULLET CLUSTER
MARKEVITCH+044
CONSTRAINTS ON DM SELF-CONSTRAINTS ON DM SELF-INTERACTION CROSS SECTIONINTERACTION CROSS SECTION
CLOWE+061
m
1
m
3-5 cm2 g-1
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OTHER BULLET CLUSTERSOTHER BULLET CLUSTERS
W. DAWSON’S WEBSITE www.mergingclustercollaboration.org 6
IMAGE SEPARATION IMAGE SEPARATION DISTRIBUTION OF SLDISTRIBUTION OF SL
OGURI 2006
GALAXY GROUPS – POOR CLUSTERS WITH
IMAGE SEPARATION IN THE RANGE 6”-16”
HAVE BEEN SCARCELY REPORTED
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SL2S GROUPSSL2S GROUPS
• INITIAL SAMPLE OF 13 OBJECTS (LIMOUSIN+09), 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 MANY GROUPS
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X-RAY FOLLOW-UPX-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 FASSNACHT+08 IS CLASS B2108+213 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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SL2SJ08544-0053
z = 0.351
BIMODAL LUMINOSITY DISTRIBUTION (BCGs at
the same redshift, MUNOZ+13).
PERTURBED LENSING CONFIGURATION WHICH
REQUIRES EXTERNAL MASS (LIMOUSIN+10)
SL2SJ08544-0053SL2SJ08544-0053
LIMOUSIN+1012
THE BULLET GROUPTHE BULLET GROUP
SEPARATION BETWEEN THE X-RAY PEAK AND THE MASS PEAK OF 25”±4” (124±20 Kpc). DM σ < 10 cm2 g-1 . LOWEST MASS TO DATE (2 X 1014 Msun ) FOR DM/BARYON SEPARATION 14
BULLET GROUP CANDIDATESBULLET GROUP CANDIDATES
XMM DATA SHOW ANOTHER INTERESTING, DISTURBED MORPHOLOGY FOR SA54
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BULLETICITYBULLETICITY
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MASSEY+11
Measurement of a statistical signal using lensing (Euclid) and X-ray surveys (EROSITA)
SUMMARYSUMMARY
• X-RAY FOLLOW-UP OF STRONG LENSING GROUPS HAS REVEALED ONE EXAMPLE OF BULLET GROUP, THE LOWEST MASS OBJECT TO DATE SHOWING DM-BARYONS SEPARATION.
• THERE ARE OTHER CANDIDATES SUITABLE FOR XMM OBSERVATIONS IN THE SL2S SAMPLE.
• POSSIBILITY OF A STATISTICAL STUDY OF DM-BARYONS SEPARATION (“BULLETICITY”) WITH FUTURE X-RAY AND LENSING SURVEYS.
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SL2SJ08544-0053SL2SJ08544-0053
CLEARLY EXTENDED SOURCE (rc = 128 ± 56 kpc, 26” ± 11”, ß = 0.52 ± 0.07)
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CONSTRAINTS ON DM SELF-CONSTRAINTS ON DM SELF-INTERACTION CROSS SECTIONINTERACTION CROSS SECTION
RANDALL+08 27