1 / 7

Star formation and submm/far-IR luminous galaxies

Star formation and submm/far-IR luminous galaxies. Andrew Blain Caltech 26 th May 2005. Kyoto COSMOS meeting. Resolved `example’: the Antennae. ISOCAM. Excellent example of distinct opt/UV and IR luminosity BUT modest luminosity

alanna
Download Presentation

Star formation and submm/far-IR luminous galaxies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Star formation and submm/far-IR luminous galaxies Andrew Blain Caltech 26th May 2005 Kyoto COSMOS meeting

  2. Resolved `example’: the Antennae ISOCAM • 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 CSO/SHARC-2 Dowell et al.

  3. 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 & 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

  4. Multiwavelength details • Radio (RMS~10Jy) 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

  5. 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 > 1, 24/8 >3 is reasonable cut • Met by COSMOS observations • Should provide decent sample of high-z ULIRGS for LSS 24m / 8m 8m / 4.5m Big symbols are submm galaxies (SMGs): size scales with z Small symbols Lockman Hole & GOODS-N Spitzer galaxies

  6. Appropriate Spitzer depths • 24/8m vs 24m • Large: SMGs • Small: IRAC • Lockman & GOODS-N • Most existing examples found if sensitivity is to 100Jy at 24m • Need to go ~30 times deeper at 8m 24m/8m color 24m flux

  7. 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 & ultimately ALMA

More Related