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AGN Feedback in Two Interesting Groups

Explore the AWM4 and AGN feedback mechanisms in galaxies NGC 5044 and other relaxed objects, including implications for temperature gradients, cavities, and sloshing phenomena. Investigate the role of dust in cooling X-ray emitting gas to form warm Hα emitting gas.

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AGN Feedback in Two Interesting Groups

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  1. AGN FEEDBACK IN TWO INTERESTING GROUPS F. Gastaldello (IASF-MI, UCI) D. Buote (UCI), P. Humphrey (UCI), W. Mathews (UCSC), F. Brighenti (U. Bologna), P. Temi (AMES), S. Molendi (IASF-MI), S. Ettori (INAF-Bologna)

  2. AWM 4: corona in a relaxed object • NGC 5044: cavities, filaments and cold fronts in the Perseus of groups OUTLINE

  3. AWM4 AND AGN FEEDBACK Gastaldello+08, see also O’Sullivan+05, Giacintucci+08

  4. AWM4 AND AGN FEEDBACK It’s also a fossil system (Zibetti+08) Gastaldello+09

  5. AWM4 AND AGN FEEDBACK Inspired by Donahue+05

  6. AWM4 AND AGN FEEDBACK

  7. NCC AWM4 AND AGN FEEDBACK CC Bauer+05 CC De Grandi & Molendi 01 NCC

  8. AWM4 AND AGN FEEDBACK Sun+09 Gastaldello+08

  9. AWM4 AND AGN FEEDBACK Cavagnolo+08

  10. NGC 5044 Gastaldello+09 (using J. Sanders’ binning code) See also results from longer Chandra observation (David+09)

  11. NGC 5044 Gastaldello+09

  12. NGC 5044 CAON ET AL. 2000 Gastaldello+09

  13. DUST IN NGC 5044 8-4.5 µm PAH TEMI, BRIGHENTI & MATHEWS 2007

  14. NGC 5044 BLACK : X-ray FILAMENT box #2 RED: X-ray FILAMENT box #7 Gastaldello+09

  15. NGC 5044 Gastaldello+09

  16. 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 ? SUMMARY

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