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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.

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sloshing cold fronts in groups

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

OUTLINE

slide3

SLOSHING CFs IN NGC 5044

z=0.009 kT=1.2 keV

Gastaldello+09

slide4

SLOSHING CFs IN NGC 5044

z=0.009 kT=1.2 keV

Gastaldello+09

slide6

SLOSHING CFs IN NGC 5044

z=0.009 kT=1.2 keV

Gastaldello+09

sloshing cfs in ic 18602

SLOSHING CFs IN IC 1860

FG et al. submitted

sloshing cfs in ic 18603

SLOSHING CFs IN IC 1860

FG et al. in prep

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

peculiar velocities and perturbers ngc 50441

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 ic1860

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 ic18601

PECULIAR VELOCITIES AND PERTURBERS: IC1860

PRESENCE OF SUBSTRUCTURES AT A MARGINAL LEVEL 96%

peculiar velocities and perturbers ngc 58461

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

RADIO EMISSION: NGC 5044

David+09

GMRT RADIO DATA AT 610 MHz

radio emission ngc 50441

RADIO EMISSION: NGC 5044

David+09

GMRT RADIO DATA AT 235 MHz

radio emission ngc 50442

RADIO EMISSION: NGC 5044

David+09

GMRT RADIO DATA AT 235 MHz

radio emission ngc 5846

RADIO EMISSION: NGC 5846

Machacek+11

GMRT RADIO DATA AT 610 MHz

radio emission ic 1860

RADIO EMISSION: IC 1860

ABSENCE OF EXTENDED 1.4 GHz EMISSION (DUNN+10)

radio emission ic 18601

RADIO EMISSION: IC 1860

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

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 ?

SUMMARY

wish list

SIMULATIONS TAILORED TO THE GROUP REGIME

  • RADIO OBSERVATIONS AND PARTICLE ACCELERATIONS IN GROUPS

WISH LIST

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