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Infrared-Luminous Galaxies and Galaxy Evolution

Infrared-Luminous Galaxies and Galaxy Evolution. Casey Papovich Steward Observatory STScI May Symposium 2004. Spitzer MIPS Instrument Science Team

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Infrared-Luminous Galaxies and Galaxy Evolution

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  1. Infrared-Luminous Galaxies and Galaxy Evolution Casey Papovich Steward Observatory STScI May Symposium 2004 Spitzer MIPS Instrument Science Team • George Rieke (MIPS PI), H. Dole, E. Egami, E. Le Floc'h, P. Perez-Gonzalez, M. Rieke, A. Alonso-Herrero, L. Bai, C. Beichmann, M. Blaylock, J. Cadien, C. Engelbracht, K. Gordon, D. Hines, K. Misselt, J. Morrison, J. Mould, J. Muzerolle, G. Neugebauer, P. Richards, J. Rigby, K. Su, E. Young Collaborators • P. Barmby, G. Fazio (IRAC PI), J. Huang, T. Soifer and IRAC IST • Eric Bell, Hans-Walter Rix, C. Wolf, D. McIntosh, J. Caldwell, K. Meisenheimer, M. Barden, R. Somerville, and the GEMS and COMBO-17 teams

  2. Multi-Wavelength Emission Primer Soifer & Neugebauer (1991): Locally, galaxies emit ~ 30% in the Infrared (8-1000µm) Hauser & Dwek (2001; review of CBR): Things must be different in the past. Status of Cosmic Background Radiation (CBR); Hauser & Dwek (2001)

  3. Spitzer 24µm Number Counts ~ 50,000 24µm sources IRAS 25 um (Hacking and Houck 1991) Papovich et al. 2004, ApJS, accepted

  4. Spitzer 24µm Scan of CDF-S 1.25 deg 0.5 deg ~ 6 arcsec resolution

  5. Spitzer 24µm Scan of CDF-S 1.25 deg 0.5 deg ~ 6 arcsec resolution

  6. Spitzer 24µm Scan of CDF-S 1.25 deg COMBO-17 R-band (C. Wolf et al.) MIPS 24µm ~ 6 arcsec resolution

  7. Redshift Distribution of Optically Selected IR Sources COMBO-17: Wolf et al. (2004); Spec.: Le F₩rve et al. (2004)

  8. Cumulative Redshift Distribution of Optically Selected IR Sources

  9. Fiducial Luminosity Density Evolution > 6 × LIR(8-1000mm) ~ 3 × n Ln(V) Luminosity Density n Ln(U) ~ 3 ×

  10. Morphological Distribution of (Optically-selected) IR-luminous Galaxies Disk-like Bulge-like Disk-like Bulge-like z = 0.7-1.0 z = 0.3-0.7 Sersic Index Morphological analysis from GEMS: H.-W. Rix et al. (2004)

  11. Morphological Distribution of (Optically-selected) IR-luminous Galaxies MIPS-detected with LIR > 1010.5LM Disk-like Bulge-like Disk-like Bulge-like z = 0.7-1.0 z = 0.3-0.7 IR-luminous IR-luminous Sersic Index Morphological analysis from GEMS: H.-W. Rix et al. (2004)

  12. HST-Spitzer Connection Morphologies of IR-Luminous Galaxies LIRG, z = 0.33 ULIRG, z = 0.68 LIRG, z = 0.33 LIRG, z = 0.46 LIRG, z = 0.48 LIRG, z = 0.24 Images from GEMS: H.-W. Rix et al. (2004)

  13. Future Directions: What is needed for future? • IR-luminous sources are rare (~ 30-40 per ACS field). Large, deep surveys required. • Work at z > 1.4 requires near-IR. NICMOS: small FOV; WFC3 obvious choice. Track morphological and environmental impact on IR-activity to z > 2 in rest-frame optical. • Choice of deep, multi-wavelength crucial for lasting legacy and accessibility at all wavelengths.

  14. 'Nature'-chosen survey fields Groth Strip ELAIS N1 HDF-N NOAO Boötes Field COSMOS Lockman Hole Marano HDF-S ELAIS S1 CDF-S IRAS 100mm All Sky Map

  15. 'Nature'-chosen survey fields Substantial penalty for IR (and X-ray) observations in high Galactic cirrus fields!

  16. Some Early Results • Number counts of ~ 50,000 24µm sources imply significant population of IR-luminous galaxies at z > 1-2. Supported by preliminary redshift distributions of optically-selected IR sources in COMBO-17 and spectra. • But, missing >1000 IR-luminous sources to R < 24-25 in CDF-S field! (Majority? of) IR-luminosity density is optically faint sources at z > 1 • IR-luminous galaxies span range of mophological type in GEMS/HST images: explore morphological indicators (asymmetry/close-pairs) that correlate with IR activity.

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