Quasar Heating inStructure ation類星體的加熱結構的形成

1、quasar heating in structure formationevan scannapiecokavli institute for theoretical physicspeng ohuc santa barbararob thackerqueens universityhugh couchmanmcmaster universitymarc davisuc berkeleywhat determines la classic argument(suginohara & ostriker 1998; lewis et al 2000; thacker et al 2000

2、; dav et al 2001) arnouts etal (2005) agn in the x-rayb-band quasar luminosity function lx m gas t1/2 t m2/3 dm1/3 lx gas dm-1/2 t2mushotzky and scharf 1997kaiser (1991)agn heatinges & oh (2004) modelnsome small fraction of an agns luminosity is converted to mechanical input associated with jets

3、 or winds.es & oh (2004) modelpredictionsdotted lines stradleoutflow efficienciesof 2.5% and 10%, central blue line is 5%big galaxies host large quasars, and can recover from feedback at only at high redshift.simulation modelingmodification of work done on sn outflowsthacker, es & couchman 2

4、006, in prepoutflows are modeled as thin spherical shells host galaxy remains intact.code detailsnopenmp version of the hydra sph code locally adaptive fourier-mesh schemegalaxy clusterstemperature/ kevlx1040104210441046lx t3.2fundamental differences between the semi-analytic & simulation models

5、naab, ostriker et al (2006)squasar-galaxy cross correlation functionblue=ggred=qghash=deep2 (from coil etal 06)blue line = 2x10seen in sdss (serber etal 2006)dynamical frictiondynamical frictionthree-body interactionsconclusionsq ui ckti m e?and ayu v420 codec decom pressorare needed to see thi s pi

6、 cture.entropy final statethanks to jon johansson, cns, u. of alberta galaxies and starswhy dont we use gadget2?simulation timetotal wallclockfinal epochfor this projectmultiple time-stepcapability in g2 isvery efficientg2 is ratherinefficient at high z(hydra)entropy evolution (slice from simulation

7、)rendered on 13403grid.simulation used0.5x109 particles(half hydro,half dark matter).dynamic range6000q ui ckti m e?and ayu v420 codec decom pressorare needed to see thi s pi cture.critical entropyheating sourcescorrelation function of quasarsnour simulation agrees with the observed turn-up in the small scale clustering of quasars ncf is explained by the “halo model” of clusteri