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SUMMARY:Trigger mechanisms and evolution of ULIRGs: local vs high-z - Kall
 iopi Dasyra (Caltech\, Spitzer Science Center)
DTSTART:20081001T121500Z
DTEND:20081001T124500Z
UID:TALK13606@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:I will discuss results from NIR spectroscopic/imaging programs
  that aim to determine the dynamical triggers and the time evolution of UL
 IRGs. For the local sample\, I will present a stellar kinematical analysis
  performed using the long-slit spectrograph ISAAC mounted on the VLT.  The
  low moments of the stellar velocity profiles\, extracted from the CO band
 heads\, indicate that local ULIRGs are typically triggered by mergers of e
 qual-mass\, sub-m*\, gas-rich galaxies and lead to the formation of modera
 te-mass ellipticals. The position of ULIRG remnants on the fundamental pla
 ne of early-type galaxies is well constrained in comparison with that of r
 emnants of other interaction/merger categories (e.g. LIRGs) and that they 
 are less massive than local Palomar-Green (PG) QSOs. This result implies t
 hat only a subsample of the local ULIRGs and PG QSOs can be part of the sa
 me evolutionary sequence. At redshifts 2\, NICMOS2 images of 24-micron sel
 ected ULIRGs show small fraction of perturbations in contrast to both z=2 
 submm galaxies and local ULIRGs. This could be attributed to different pro
 perties in the stellar/ISM distribution between the two populations or sel
 ection effects. A bulge/disk decomposition of the brightest sources indica
 tes that if bulges are indeed present\, they are small. Therefore\, at lea
 st a non-negligible number of z~2 ULIRGs dynamically differs from their lo
 cal analogues.\n\n
LOCATION:Sackler Lecture Theatre\, IoA
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