COLD FRONTS IN X-RAY RELAXED GROUPS

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Presentation transcript:

COLD FRONTS IN X-RAY RELAXED GROUPS FABIO GASTALDELLO INAF-IASF MILANO UC IRVINE

OUTLINE / MOTIVATION COLD FRONTS (see Simona’s Astrosiesta talk) AND DYNAMICAL STATE COLD FRONTS IN THE RELAXED GROUP NGC 5044 THE CLASS OF COLD FRONTS IN RELAXED GROUPS: ANOTHER EXAMPLE IN IC 1860 … Introduction with NFW and cosmological relevance of the c-M relation with current observational results Lack of results in the group mass range which spurred the work I’m presenting here. Method of analysis (bkg subtraction, potential approach to HE equation, care to addressing systematics) Group results Cosmological implications of the extended sample ranging from ellipticals to massive clusters (Buote et al. 2006)

COLD FRONTS IN CLUSTERS IN MERGING CLUSTERS IN RELAXED CLUSTERS Markevitch & Vikhlinin 07

COLD FRONTS IN CLUSTERS Ascasibar & Markevitch 06

COLD FRONTS IN CLUSTERS Markevitch & Vikhlinin 07

HOW ABOUT GROUPS ? EXAMPLES IN MERGING SYSTEMS, e.g. NGC 1404 IN FORNAX (Machacek+05)

COLD FRONTS IN NGC 5044 FIRST BRIEF MENTION OF A POSSIBLE COLD FRONT IN THE RELAXED GROUP NGC 5044 (BUOTE+02)

COLD FRONTS IN NGC 5044 MENDEL+08 STUDY OF 111 MEMBERS: PECULIAR VELOCITY OF 150 km/s WRT THE MEAN VELOCITY

COLD FRONTS IN NGC 5044 GASTALDELLO+08: arXiv0807.3526

COLD FRONTS IN NGC 5044 280-350 350-80 GASTALDELLO+08: arXiv0807.3526

COLD FRONTS IN NGC 5044 GASTALDELLO+08

COLD FRONTS IN NGC 5044 GASTALDELLO+08

COLD FRONTS IN NGC 5044 GASTALDELLO+08

COLD FRONTS IN NGC 5044 DETECTION OF A SUBSTRUCTURE (99.9 %) AT 1.4 Mpc MENDEL+08

IC 1860 ONE SOURCE MIGHT JUST BE ODD, TWO ARE A CLASS ~ 70 MEMBERS FROM 2DF, AGAIN PECULIAR VELOCITY OF THE cD w/ 140 km/s

OK, BUT WHY DO WE CARE ? STEPS TOWARDS A PRECISE CHARACTERIZATION OF THE DYNAMICAL STATE OF A CLUSTER/GROUP THANKS TO MULTI-LAMBDA OBSERVATIONS Markevitch & Vikhlinin 07

OK, BUT WHY DO WE CARE ? STEPS TOWARDS A PRECISE CHARACTERIZATION OF THE DYNAMICAL STATE OF A CLUSTER/GROUP THANKS TO MULTI-LAMBDA OBSERVATIONS