SLOSHING COLD FRONTS IN SLOSHING COLD FRONTS IN GROUPSGROUPS
FABIO GASTALDELLO
(IASF-MILAN, UC IRVINE)
DI GESU, BUOTE, ECKERT, ETTORI, GHIZZARDI, GIACINTUCCI, GIRARDI,
HUMPHREY, ROSSETTI, ROEDIGER, DE GRANDI, MOLENDI, MATHEWS,
BRIGHENTI
OUTLINEOUTLINE
• 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 5044SLOSHING CFs IN NGC 5044
Gastaldello+09
z=0.009 kT=1.2 keV
SLOSHING CFs IN NGC 5044SLOSHING CFs IN NGC 5044
Gastaldello+09
z=0.009 kT=1.2 keV
SLOSHING CFs IN NGC 5044SLOSHING CFs IN NGC 5044
Gastaldello+09
SLOSHING CFs IN NGC 5044SLOSHING CFs IN NGC 5044
Gastaldello+09
z=0.009 kT=1.2 keV
EXCESS IN NGC 5044 EXCESS IN NGC 5044
EXCESS IN NGC 5044 EXCESS IN NGC 5044
EXCESS IN NGC 5044 EXCESS IN NGC 5044
SLOSHING CFs IN IC 1860SLOSHING CFs IN IC 1860
FG et al. submitted
z=0.022 kT=1.4 keV
SLOSHING CFs IN IC 1860SLOSHING CFs IN IC 1860
FG et al. submitted
z=0.022 kT=1.4 keV
SLOSHING CFs IN IC 1860SLOSHING CFs IN IC 1860
FG et al. submitted
SLOSHING CFs IN IC 1860SLOSHING CFs IN IC 1860
FG et al. in prep
SLOSHING CFs IN IC 1860SLOSHING CFs IN IC 1860
SLOSHING CFs IN IC 1860SLOSHING CFs IN IC 1860
COMPARISON W/ SIMULATIONSCOMPARISON W/ SIMULATIONS
SLOSHING CFs IN NGC 5846SLOSHING CFs IN NGC 5846
Machacek+11
SLOSHING CFs IN NGC 5846SLOSHING CFs IN NGC 5846
Machacek+11
SLOSHING CFs IN NGC 5846SLOSHING CFs IN NGC 5846
Machacek+11
SLOSHING CFs IN NGC 5846SLOSHING CFs IN NGC 5846
SLOSHING CFs IN NGC 5846SLOSHING CFs IN NGC 5846
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERSPERTURBERS
AM 06
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: NGC 5846PERTURBERS: NGC 5846
Machacek+11
NGC 5850: HIGH SPEED NGC 5850: HIGH SPEED ENCOUNTER WITH NGC 5846 ?ENCOUNTER WITH NGC 5846 ?
Higdon+98
NGC 5850: HIGH SPEED NGC 5850: HIGH SPEED ENCOUNTER WITH NGC 5846 ?ENCOUNTER WITH NGC 5846 ?
Higdon+98
NGC 5850: HIGH SPEED NGC 5850: HIGH SPEED ENCOUNTER WITH NGC 5846 ?ENCOUNTER WITH NGC 5846 ?
Higdon+98
MENDEL+08 STUDY OF 111 MEMBERS:
PECULIAR VELOCITY OF 156 km/s WRT THE MEAN VELOCITY
Z-score: 4.8σ
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: NGC 5044PERTURBERS: NGC 5044
DETECTION OF A SUBSTRUCTURE (99.9 %) AT 1.4 Mpc MENDEL+08. OR NGC 5054 (DAVID+09).
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: NGC 5044PERTURBERS: NGC 5044
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: NGC 5044PERTURBERS: NGC 5044
cz = 2733 km/s
cz = 1658 km/s
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: NGC 5044PERTURBERS: NGC 5044
cz = 2733 km/s
cz = 1658 km/s
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: IC1860PERTURBERS: 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 PECULIAR VELOCITIES AND PERTURBERS: IC1860PERTURBERS: IC1860
PRESENCE OF SUBSTRUCTURES AT A MARGINAL LEVEL 96%
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: IC1860PERTURBERS: IC1860
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: IC1860PERTURBERS: IC1860
PECULIAR VELOCITIES AND PECULIAR VELOCITIES AND PERTURBERS: NGC 5846PERTURBERS: 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 5044RADIO EMISSION: NGC 5044
GMRT RADIO DATA AT 610 MHz
David+09
RADIO EMISSION: NGC 5044RADIO EMISSION: NGC 5044
GMRT RADIO DATA AT 235 MHz
David+09
RADIO EMISSION: NGC 5044RADIO EMISSION: NGC 5044
GMRT RADIO DATA AT 235 MHz
David+09
RADIO EMISSION: NGC 5846RADIO EMISSION: NGC 5846
GMRT RADIO DATA AT 610 MHz
Machacek+11
RADIO EMISSION: IC 1860RADIO EMISSION: IC 1860
ABSENCE OF EXTENDED 1.4 GHz EMISSION (DUNN+10)
RADIO EMISSION: IC 1860RADIO EMISSION: IC 1860
GMRT RADIO DATA AT 325 MHz. EMISSION AT THESE SCALES INDICATES VERY STEEP SPECTRUM.
RADIO EMISSIONRADIO EMISSION
ZuHone+13
SUMMARYSUMMARY
• 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 LISTWISH LIST
• SIMULATIONS TAILORED TO THE GROUP REGIME
• RADIO OBSERVATIONS AND PARTICLE ACCELERATIONS IN GROUPS
Top Related