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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2306
DTSTART:20111013T203000Z
DTEND:20111013T220000Z
DTSTAMP:20260416T232245Z
LAST-MODIFIED:20111010T205548Z
LOCATION:4421 Sterling Hall
SUMMARY:Do Supermassive Black Holes Co-Evolve with Their Host Galaxies
 ?\, Astronomy Colloquium\, Chien Peng\, Carnegie Observatories
DESCRIPTION:For almost 20 years\, one of the intriguing puzzles in gal
 axy evolution is the strong correlations that have been observed betwe
 en galaxies and their central supermassive black holes. The correlatio
 ns suggested that galaxies and their central black holes somehow "knew
 " about each other\, and that their evolution occurred in lock-steps. 
  Theoretical models painted a beautiful picture that showed how quasar
  activity can both regulate the growth of the black hole and cause sta
 r formation inside galaxies to cease\, thereby producing strong correl
 ations that have been observed.  The energy feedback by quasars in tur
 n may solve a number of other puzzles in galaxy evolution.  In recent 
 years\, new observations from quasars\, ULIRGS\, maser galaxies\, and 
 dwarf galaxies\, are providing an increasingly complex picture about t
 he relationship between black holes and galaxies.  I will present rece
 nt data on the BH and galaxy relations both at high redshift and local
 ly\, evidence for a changing correlation\, and controversies surroundi
 ng the observations.  I will also discuss why\, if black holes self-re
 gulate galaxy growth as theories suggest\, that self regulation should
  have happened before redshift 2\, and subsequently the correlation ma
 y have to be maintained via statistical merging alone.  However\, I wi
 ll explain how statistical merging may itself be able to explain the e
 ntire correlation\, such that black holes and galaxies may actually no
 t need to know about one another.  Lastly\, I will tie all the quasar 
 data with observations of "red nugget\," normal\, galaxies at high red
 shift to illustrate which direction the needle compass points\, despit
 e there being controversies that remain about selection functions and 
 black hole mass estimates in active galaxies.
URL:https://www.physics.wisc.edu/events/?id=2306
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