AGN FEEDBACK IN TWO AGN FEEDBACK IN TWO INTERESTING GROUPSINTERESTING GROUPS

F. Gastaldello F. Gastaldello

(IASF-MI, UCI)(IASF-MI, UCI)D. Buote (UCI), P. Humphrey (UCI), D. Buote (UCI), P. Humphrey (UCI),

W. Mathews (UCSC), F. Brighenti (U. W. Mathews (UCSC), F. Brighenti (U. Bologna), P. Temi (AMES), S. Molendi Bologna), P. Temi (AMES), S. Molendi

(IASF-MI), S. Ettori (INAF-Bologna)(IASF-MI), S. Ettori (INAF-Bologna)

OUTLINEOUTLINE

•AWM 4: corona in a relaxed object

•NGC 5044: cavities, filaments and cold fronts in

the Perseus of groups

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

Gastaldello+08, see also O’Sullivan+05, Giacintucci+08

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

Gastaldello+09

It’s also a fossil system (Zibetti+08)

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

Inspired by Donahue+05

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

Bauer+05Bauer+05

CCCC

NCCNCC

CCCC

NCCNCC De Grandi & Molendi 01De Grandi & Molendi 01

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

Gastaldello+08Sun+09

AWM4 AND AGN FEEDBACKAWM4 AND AGN FEEDBACK

Cavagnolo+08Cavagnolo+08

NGC 5044 NGC 5044

Gastaldello+09 (using J. Sanders’ binning code)

See also results from longer Chandra observation (David+09)

NGC 5044 NGC 5044

Gastaldello+09

NGC 5044 NGC 5044

CAON ET AL. 2000

Gastaldello+09

DUST IN NGC 5044 DUST IN NGC 5044

TEMI, BRIGHENTI & MATHEWS 2007

8-4.5 µm PAH

NGC 5044 NGC 5044

Gastaldello+09

BLACK : X-ray FILAMENT box #2

RED: X-ray FILAMENT box #7

NGC 5044 NGC 5044

Gastaldello+09

SUMMARYSUMMARY•Corona in a central BCG of a relaxed object:

what are the implications for the AGN feedback loop ?

•Why is it so different from other objects able to preserve the temperature gradient ?

Are there others ?

•Cavities close to the nucleus but not filled by 1.4 GHz emission in some groups (also

NGC 4325): is that strange ?

•Sloshing seems to be a rather common feature, we are starting to see that also in

groups (NGC 5098, aka RGH 80, Randall+09). What are the implications (see Markevitch’s

talk) ?

•What if dust just aids to cool X-ray emitting gas to form warm Hα emitting gas ?