COLD FRONTS IN CLUSTERS COLD FRONTS IN CLUSTERS AND THE PECULIAR VELOCITY AND THE PECULIAR VELOCITY
OF THEIR BCGsOF THEIR BCGs
FABIO GASTALDELLOINAF-IASF MILAN & UC IRVINE
M. MESSA
S. GHIZZARDI, M. ROSSETTI, D. ECKERT, S. DE GRANDI, S. MOLENDI
• PECULIAR VELOCITY OF BCGs AND X-RAY THERMODYNAMICAL STATE / PRESENCE OF CFs
• THE IMPORTANCE OF ASSESSING SUBSTRUCTURES FOR THE ESTIMATES OF PECULIAR VELOCITIES: THE CASE OF A2626
OUTLINE OUTLINE
PECULIAR VELOCITIES OF BCGs PECULIAR VELOCITIES OF BCGs AND X-RAY STATEAND X-RAY STATE
CROSS-MATCH OF X-RAY PEAK AND BCG POSITION. ONLY IN EXTREME MERGERS (A754,
A3376) LARGE SEPARATION.
RESULTING SAMPLE OF 54 OBJECTS
COZIOL+09
452 ABELL CLUSTERS W/ MORE THAN 10 MEMBERS
VP OF BCG
CAVAGNOLO+09
241 CLUSTERS
K0 AS INDICATOR OF THERMODYNAMICAL STATE
FG, Messa, et al. in prep
PECULIAR VELOCITIES OF BCGs PECULIAR VELOCITIES OF BCGs AND X-RAY STATEAND X-RAY STATE
CC NCC
VVPP OF BCGs AND X-RAY STATE OF BCGs AND X-RAY STATE
KENDALL TEST: 93.2%
KS TEST 97.7 %
CAVEAT: SUBSTRUCTURES !CAVEAT: SUBSTRUCTURES !
vcl: 17307 km/s 16533 km/s
Vp: 802 km/s 27 km/s σv: 1057 km/s 658 km/s kT=2.9 keV
ABELL 262682 MEMBERS
CLEAR DETECTION OF SUBSTRUCTURES ALREADY IN MOHR+96
IT HOSTS A MINI RADIO HALO (GITTI+04)
PEAK 1
PEAK 2
With CF
A133 176
A1644 29
A1795 238
A496 55
A2029 61
A2052 185
A2199 156
CENTAURUS 125
A4059 27
A85 43
A478 340
VVPECPEC OF BCGs AND X-RAY STATE OF BCGs AND X-RAY STATE
NO CF
A1068 127
A2107 187
A2556 85
A2626 802 27
A2717 107
A3112 215
A3581 31
ESO 3060170 20
MKW3S 27
A1361 204
A2667 382
VVPECPEC OF BCGs OF BCGs
COZIOL+09: “A large fractions of BCGs have significant peculiar velocity. This has one immediate consequence, which is that most clusters harboring a dominant galaxy are not dynamically relaxed”
VAN DEN BOSCH+05: “The brightest galaxy in a dark matter halo is expected to reside at rest at the centre of the halo. In this paper, we test this `Central Galaxy Paradigm' (CGP) using group catalogues extracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) and the Sloan Digital Sky Survey (SDSS).We show that the CGP is only consistent with the data in haloes with M < 1013 Msun, while in more massive haloes the data indicate a non-zero offset between the brightest galaxy and the satellites. This indicates that either central galaxies reside at the minimum of the dark matter potential, but that the halo itself is not yet fully relaxed, or, that the halo is relaxed, but that the central galaxy oscillates in its potential well.
VVPECPEC OF BCGs OF BCGs
Van den Bosch+05
MIRALDA-ESCUDE’+95: “The fact that cD galaxies often have large peculiar velocities relative to the average of the cluster galaxies has been used as an argument against their identification as cluster centers: however, clusters are continuously merging, and their density peaks do not need to coincide with their centers of mass. Substructure will cause the density peaks to move, in response to the gravitational forces of the infalling material”
VVPECPEC OF BCGs OF BCGs
Abell 383Richard+11
• OFF-AXIS MERGERS INDUCING COLD FRONTS CAN EXPLAIN SPEEDING BCGs ALSO IN RELAXED CLUSTERS: NEEDS FURTHER INVESTIGATION TAKING CARE OF POSSIBLE SUBSTRUCTURES
• PECULIAR VELOCITIES OF BCGs FITS NATURALLY IN A HIERARCHICAL PICTURE OF STRUCTURE FORMATION AND SLOSHING/COLD FRONTS ARE AND X-RAY SIGNATURE
SUMMARY SUMMARY
COLD FRONTS AND METALS COLD FRONTS AND METALS ANISOTROPIES IN ZW ANISOTROPIES IN ZW
1742+33061742+3306
STEFANO ETTORIOBSERVATORY OF BOLOGNA
F. GASTALDELLO, M. GITTI, E. O’SULLIVAN, M. GASPARI, F. BRIGHENTI, L. DAVID, A. EDGE
ZW 1742+3306 ZW 1742+3306
ZW 1742+3306: COLD FRONTS ZW 1742+3306: COLD FRONTS
ZW 1742+3306: COLD FRONTS ZW 1742+3306: COLD FRONTS
ZW 1742+3306: COLD FRONTS ZW 1742+3306: COLD FRONTS
ZW 1742+3306: METAL BAR ZW 1742+3306: METAL BAR
AGN METAL OUTFLOWS AGN METAL OUTFLOWS
Kirkpatrick+11
AGN METAL OUTFLOWS AGN METAL OUTFLOWS
Kirkpatrick+11
AGN METAL OUTFLOWS AGN METAL OUTFLOWS
Kirkpatrick+11
SLOSHING CAN’T DO IT ... SLOSHING CAN’T DO IT ...
Roediger+11
ZW 1742+3306: METAL BAR ZW 1742+3306: METAL BAR
• VERY STRUCTURED COLD FRONT IN ZW1742: KH INSTABILITY
• ANISOTROPY IN THE METAL DISTRIBUTION: AGN MOST LIKELY, HOWEVER CAN SLOSHING DO IT ?
SUMMARY SUMMARY
