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SLOSHING COLD FRONTS IN GROUPS

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Presentation on theme: "SLOSHING COLD FRONTS IN GROUPS"— Presentation transcript:

1 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

2 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

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

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

5 SLOSHING CFs IN NGC 5044 Gastaldello+09

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

7 EXCESS IN NGC 5044

8 EXCESS IN NGC 5044

9 EXCESS IN NGC 5044

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

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

12 SLOSHING CFs IN IC 1860 FG et al. submitted

13 SLOSHING CFs IN IC 1860 FG et al. in prep

14 SLOSHING CFs IN IC 1860

15 SLOSHING CFs IN IC 1860

16 COMPARISON W/ SIMULATIONS

17 SLOSHING CFs IN NGC 5846 Machacek+11

18 SLOSHING CFs IN NGC 5846 Machacek+11

19 SLOSHING CFs IN NGC 5846 Machacek+11

20 SLOSHING CFs IN NGC 5846

21 SLOSHING CFs IN NGC 5846

22 PECULIAR VELOCITIES AND PERTURBERS
AM 06

23 PECULIAR VELOCITIES AND PERTURBERS: NGC 5846
Machacek+11

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

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

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

27 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

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

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

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

31 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

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

33 PECULIAR VELOCITIES AND PERTURBERS: IC1860

34 PECULIAR VELOCITIES AND PERTURBERS: IC1860

35 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

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

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

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

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

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

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

42 RADIO EMISSION ZuHone+13

43

44

45 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 ?

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

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