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THE BULLET GROUP

THE BULLET GROUP. FABIO GASTALDELLO INAF-IASF MILAN & UC IRVINE. THE BULLET GROUP. FABIO GASTALDELLO INAF-IASF MILAN & UC IRVINE

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THE BULLET GROUP

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  1. THE BULLET GROUP FABIO GASTALDELLO INAF-IASF MILAN & UC IRVINE

  2. 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

  3. Intra-cluster medium (ICM) Thermal plasma Galaxies Dark Matter Gravitational potential 1E 0657-156 THE BULLET CLUSTER MARKEVITCH+04

  4. CONSTRAINTS ON DM SELF-INTERACTION CROSS SECTION 3-5 cm2 g-1 CLOWE+06

  5. OTHER BULLET CLUSTERS W. DAWSON’S WEBSITE www.mergingclustercollaboration.org

  6. GALAXY GROUPS – POOR CLUSTERS WITH IMAGE SEPARATION IN THE RANGE 6”-16” HAVE BEEN SCARCELY REPORTED IMAGE SEPARATION DISTRIBUTION OF SL OGURI 2006

  7. 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 SL2S GROUPS

  8. SL2S GROUPS

  9. IMAGE SEPARATION DISTRIBUTION OF SL2S MORE+12

  10. 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 X-RAY FOLLOW-UP

  11. SL2SJ08544-0053 z = 0.351 BIMODAL LUMINOSITY DISTRIBUTION (BCGs at the same redshift, MUNOZ+13). PERTURBED LENSING CONFIGURATION WHICH REQUIRES EXTERNAL MASS (LIMOUSIN+10) SL2SJ08544-0053 LIMOUSIN+10

  12. SL2SJ08544-0053 ELONGATED X-RAY EMISSION TEMPERATURE OF KT=3.5±0.5 keV

  13. THE 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. SL2S J08544 SL2S J08544 SHAN+10

  15. THE NUMBER DENSITY OF BULLET GROUPS IS 3 TIMES LARGER THAN BULLET CLUSTERS FERNANDEZ-TRINCADO+14

  16. BULLET GROUP CANDIDATES SA10 SA41 SA54 SA113 SA58 SA117

  17. BULLET GROUP CANDIDATES XMM DATA SHOW ANOTHER INTERESTING, DISTURBED MORPHOLOGY FOR SA54

  18. BULLETICITY MASSEY+11 Measurement of a statistical signal using lensing (Euclid) and X-ray surveys (EROSITA)

  19. 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. SUMMARY

  20. THANKS !

  21. SL2S GROUPS

  22. SL2SJ08544-0053 CLEARLY EXTENDED SOURCE (rc = 128 ± 56 kpc, 26” ± 11”, ß = 0.52 ± 0.07)

  23. SL2SJ08544-0053

  24. SL2SJ08544-0053

  25. BULLETTICITY MASSEY+11

  26. CONSTRAINTS ON DM SELF-INTERACTION CROSS SECTION RANDALL+08

  27. BABY BULLET (MACS J0025) BRADAČ+08

  28. FERNANDEZ-TRINCADO+14

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