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Infrared Luminous Galaxies and Their Role in Galaxy Evolution

This presentation discusses the characteristics, contributions, and morphological types of infrared-luminous galaxies and their significance in galaxy evolution. Utilizing data from the Spitzer MIPS instrument, we analyze their infrared emissions, with a specific focus on the redshift distribution, luminosity density evolution, and morphological analysis from the GEMS dataset. Notably, we highlight the challenges of observing these galaxies, the need for extensive deep surveys, and future directions for understanding their impact on cosmic structure formation at different evolutionary stages.

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Infrared Luminous Galaxies and Their Role in 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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