Published on August 29, 2007
Star formation and submm/far-IR luminous galaxies: Star formation and submm/far-IR luminous galaxies Andrew Blain Caltech 26th May 2005 Kyoto COSMOS meeting Slide2: Resolved `example’: the Antennae Excellent example of distinct opt/UV and IR luminosity BUT modest luminosity Interaction long known, but great luminosity unexpected ~90% energy escapes at far-IR wavelengths Resolved images important Relevant scales ~1' at high redshift HST WFPC2 ISOCAM CSO/SHARC-2 Dowell et al. Current status and questions: Current status and questions The most luminous high-z galaxies emit most radiation in far-IR Associated with forming ellipticals/bulges? Arguments: space density, dynamical CO mass, clustering All will be better established by COSMOS Need to find these things ‘ULIRGs’ - few 1012Lo MAMBO (Eva Schinnerer andamp; MPI/Bonn) and BOLOCAM (James Aguirre, U Colorado / CSO Caltech) MAMBO 1.25mm, 1mJy RMS over 0.13 deg2 BOLOCAM 1.1mm, 2.5 mJy RMS over 0.28 deg2 I.e. BOLOCAM 3x coarser resolution, 3x higher noise, 2x wider area BOLOCAM noise very uniform: can probe fluctuations from faint sources, at 1- level Reasonable coverage over 15% of HST COSMOS Future APEX/SCUBA-2 survey for whole region Knowledge of properties of far-IR/submm galaxies properties link to Spitzer strategies - in addition to BzK selection Multiwavelength details: Multiwavelength details Radio (RMS~10Jy) is just adequate to reach the most luminous galaxies over z~1-2 Ground-based photometry will help with a real test of viability of photo-z’s for these objects - how red and recognizable? X-ray data over uniquely large field will identify the minority of powerful AGN in the sample can use limits from Spitzer/submm to better assess opacity in AGN Can they be identified with red objects? WFC3 IF HST is serviced COSMOS may be key beneficiary Spitzer colors/fluxes: Spitzer colors/fluxes Spitzer rest near-IR and mid-IR red sources can be ID’ed as submm galaxies with reasonable efficiency 8/4.5 andgt; 1, 24/8 andgt;3 is reasonable cut Met by COSMOS observations Should provide decent sample of high-z ULIRGS for LSS 8m / 4.5m 24m / 8m Big symbols are submm galaxies (SMGs): size scales with z Small symbols Lockman Hole andamp; GOODS-N Spitzer galaxies Appropriate Spitzer depths: Appropriate Spitzer depths 24/8m vs 24m Large: SMGs Small: IRAC Lockman andamp; GOODS-N Most existing examples found if sensitivity is to 100Jy at 24m Need to go ~30 times deeper at 8m 24m flux 24m/8m color Summary: Summary COSMOS contains largest mm-wave images Still at relatively early stage Much better multiwavelength coverage than other fields AGN - starburst discrimination Spitzer data will assist dramatically If deep enough to exploit to identify mid-IR bright galaxies in color-color space Limits on far-IR properties of the zoo of interesting lower-z objects are valuable Pathfinder for future instruments: APEX, SCUBA-2 andamp; ultimately ALMA
Appropriate Spitzer depths24/8µm vs 24µmLarge: SMGsSmall: IRACLockman & GOODS-NMost existing examples found if sensitivity is to 100µ ...
Star formation and submm/far-IR luminous galaxiesAndrew Blain Caltech26th May 2005Kyoto COSMOS meeting