SLOSHING COLD FRONTS IN GROUPS

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Presentation transcript:

SLOSHING COLD FRONTS IN GROUPS FABIO GASTALDELLO (IASF-MILAN, UC IRVINE) DI GESU, BUOTE, ECKERT, ETTORI, GHIZZARDI, GIACINTUCCI, GIRARDI, HUMPHREY, ROSSETTI, ROEDIGER, DE GRANDI, MOLENDI, MATHEWS, BRIGHENTI

OUTLINE SLOSHING COLD FRONTS IN GROUPS: NGC 5044, IC 1860, NGC 5846 PECULIAR VELOCITIES OF THE BCGs OPTICALLY DISTURBED SPIRAL GALAXIES AS PERTURBERS RADIO EMISSION

SLOSHING CFs IN NGC 5044 z=0.009 kT=1.2 keV Gastaldello+09

SLOSHING CFs IN NGC 5044 z=0.009 kT=1.2 keV Gastaldello+09

SLOSHING CFs IN NGC 5044 Gastaldello+09

SLOSHING CFs IN NGC 5044 z=0.009 kT=1.2 keV Gastaldello+09

EXCESS IN NGC 5044

EXCESS IN NGC 5044

EXCESS IN NGC 5044

SLOSHING CFs IN IC 1860 z=0.022 kT=1.4 keV FG et al. submitted

SLOSHING CFs IN IC 1860 z=0.022 kT=1.4 keV FG et al. submitted

SLOSHING CFs IN IC 1860 FG et al. submitted

SLOSHING CFs IN IC 1860 FG et al. in prep

SLOSHING CFs IN IC 1860

SLOSHING CFs IN IC 1860

COMPARISON W/ SIMULATIONS

SLOSHING CFs IN NGC 5846 Machacek+11

SLOSHING CFs IN NGC 5846 Machacek+11

SLOSHING CFs IN NGC 5846 Machacek+11

SLOSHING CFs IN NGC 5846

SLOSHING CFs IN NGC 5846

PECULIAR VELOCITIES AND PERTURBERS AM 06

PECULIAR VELOCITIES AND PERTURBERS: NGC 5846 Machacek+11

NGC 5850: HIGH SPEED ENCOUNTER WITH NGC 5846 ? Higdon+98

NGC 5850: HIGH SPEED ENCOUNTER WITH NGC 5846 ? Higdon+98

NGC 5850: HIGH SPEED ENCOUNTER WITH NGC 5846 ? Higdon+98

PECULIAR VELOCITIES AND PERTURBERS: NGC 5044 MENDEL+08 STUDY OF 111 MEMBERS: PECULIAR VELOCITY OF 156 km/s WRT THE MEAN VELOCITY Z-score: 4.8σ

PECULIAR VELOCITIES AND PERTURBERS: NGC 5044 DETECTION OF A SUBSTRUCTURE (99.9 %) AT 1.4 Mpc MENDEL+08. OR NGC 5054 (DAVID+09).

PECULIAR VELOCITIES AND PERTURBERS: NGC 5044 cz = 2733 km/s cz = 1658 km/s

PECULIAR VELOCITIES AND PERTURBERS: NGC 5044 cz = 2733 km/s cz = 1658 km/s

PECULIAR VELOCITIES AND PERTURBERS: IC1860 STUDY OF 81 MEMBERS AVAILABLE IN NED: PECULIAR VELOCITY OF 113±50 km/s (Z-score significant at the 2.3σ level) WRT THE MEAN VELOCITY

PECULIAR VELOCITIES AND PERTURBERS: IC1860 PRESENCE OF SUBSTRUCTURES AT A MARGINAL LEVEL 96%

PECULIAR VELOCITIES AND PERTURBERS: IC1860

PECULIAR VELOCITIES AND PERTURBERS: IC1860

PECULIAR VELOCITIES AND PERTURBERS: NGC 5846 39 OBJECTS WITHIN 400 Kpc, NO SIGNIFICANT SUBSTRUCTURES, PECULIAR VELOCITY OF THE BCG OF -119 Km/s SIGNIFICANT AT 1.6σ

RADIO EMISSION: NGC 5044 David+09 GMRT RADIO DATA AT 610 MHz

RADIO EMISSION: NGC 5044 David+09 GMRT RADIO DATA AT 235 MHz

RADIO EMISSION: NGC 5044 David+09 GMRT RADIO DATA AT 235 MHz

RADIO EMISSION: NGC 5846 Machacek+11 GMRT RADIO DATA AT 610 MHz

ABSENCE OF EXTENDED 1.4 GHz EMISSION (DUNN+10) RADIO EMISSION: IC 1860 ABSENCE OF EXTENDED 1.4 GHz EMISSION (DUNN+10)

RADIO EMISSION: IC 1860 GMRT RADIO DATA AT 325 MHz. EMISSION AT THESE SCALES INDICATES VERY STEEP SPECTRUM.

RADIO EMISSION ZuHone+13

SUMMARY COLD FRONTS IN RELAXED GROUPS ARE PROBABLY PROVIDING THE BEST EVIDENCE OF THE SLOSHING SCENARIO. WE FIND THE RIGHT FEATURES IN THE ICM, PECULIAR VELOCITIES OF THE BCGs AND GOOD CANDIDATES FOR THE PERTURBER IN IC1860 WE HAVE EVIDENCE OF COINCIDENCE OF EXTENDED RADIO EMISSION SPATIALLY COINCIDENT WITH THE EXTENT OF A COLD FRONT (UNLIKE OTHER GROUPS). DO WE NEED REACCELERATION ?

WISH LIST SIMULATIONS TAILORED TO THE GROUP REGIME RADIO OBSERVATIONS AND PARTICLE ACCELERATIONS IN GROUPS