Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 275/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #198 Tidal Dwarf Galaxies Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Sarah Higdon, Cornell University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsStare Hours Approved: 10.9 Abstract: Tidal Dwarf Galaxies (TDG’s) are formed from material stripped from the disks of spiral galaxies, which are undergoing tidal interactions with a nearby companion. These galaxies provide important clues to our understanding of galaxy formation, evolution and cosmic recycling. Using the IRS we will measure the star formation activity in 6 TDG candidates. We will measure the ionization state ( [NeII] 12.8 um, [NeIII] 15.6 um and [NeV] 14.3um and [OIV] 25.9 um), the density in the ionized gas ([SIII] 18.7um/33.5um), the PAH fractions at 5.5−9um and 11−12.2um and possibly (optimistic here!) molecular hydrogen emission form PDRs at H2 (S0) 28um and H2 (S1) at 17um. In addition to the IRS observations we will map both the Guitar and Stephan’s Quintet with IRAC. This will enable us to compare the PAH fraction in the dwarf galaxy to that of its parent. Similarly we will compare our observation of the proposed TDG at the southern tip of NGC 4038 with the GT observations of the central region of the Antennae. This program compliments two existing GT programmes: 1) the high−Z program − these observations enable us to observe in fine detail the nearby/present day analogs of galaxy formation in the early universe. 2) Blue Compact Dwarf programme − On first inpsection BCD’s and TDG’s appear the same: BCDs are similar in size to TDG’s, but TDG’s may not have a large dark matter halo component (affecting the long term stability of an object) and BCD’s typically have a much lower metallicity. We will be able to compare the star formation activity in terms of the ionization state and PAH fraction in the two galaxy types. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 276/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30184 Spitzer Observations Of A Z=2.3 Galaxy Cluster Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: James R. Houck, Cornell University Co−Investigators: James Higdon, Cornell University Sarah Higdon, Cornell University Terry Herter, Cornell University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 3.0 Abstract: Understanding the development of large scale structure and the evolution of galaxies in high−redshift clusters are key goals of observational astrophysics. We have identified a cluster of 14 luminous H−alpha emission line sources within a ~2 Mpc diameter region at z=2.3 towards the quasar FBQS J1416+2649. The J1416 cluster represents one of the richest known high−z galaxy clusters. We will use 3−hours of Spitzer Space Telescope time to otbain deep IRAC 3.6−8.0 um and MIPS 24 um images of the J1416 cluster in order to measure the rest−frame near− and mid−infrared emission from the 14 robustly star forming (or AGN dominated) galaxies. The final rest−frame optical to mid−infrared spectral energy distribution will be used to (1) constrain the evolved stellar populations in the cluster galaxies, allowing us to (2) model their star formation histories (i.e., recent starburst or exponentially decaying SFR, etc.) with Starburst99 and Pegase. Moreover, we will (3) identify highly obscured cluster galaxies and AGN and (4) estimate photometric redshifts for objects dominated by evolved stars throughout the young galaxy cluster. Selecting cluster galaxies based on both massive star formation and evolved stellar content will yield a more complete census of star and galaxy formation in an important epoch. Thursday March 25, 2010 xgal_covers.txt 138/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 277/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30226 IRS Spectroscopy of Silicate Dropouts at z~1.5 Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Harry Teplitz, Spitzer Science Center Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 9.0 Abstract: We request 9 hours of IRS spectrscopy to follow up strongly silicate absorbing ULIRGs at z~1.5. We have previously obtained 16 and 24 micron imaging of targets in the Bootes field to look for the sources with the most extreme 16/24 color. These are expected to be the signature of strong silicate absorption redshifted into the 24 micron filter. These sources are likely to be obscured AGN. The fraction of such AGN at z>1 has important implications for the sources of the IR and X−ray background. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 278/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30334 IRS Spectroscopy of Starburst−Dominated ULIRGs at 2 < z < 3 Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Vandana Desai, Caliornia Institue of Technology Co−Investigators: Vandana Desai, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap Hours Approved: 34.9 Abstract: We request 34.9 hours of Spitzer time to obtain mid−infrared IRS LL1 spectra of 16 extreme (f(24)/f(R) > 1000) infrared sources selected from the NOAO Deep Wide−Field Survey Bootes field. Each target displays a 1.6 micron rest−frame stellar bump indicating that 1) it has a redshift in the range 2 < z < 3; and 2) its infrared luminosity is primarily generated by reprocessed starlight, rather than AGN−heated dust. These spectra will allow us to study the mid−infrared properties of the most luminous starburst−dominated galaxies to z=3. We will also confirm the stellar bump as an indicator of starburst domination and calibrate the bump photometric redshifts for extreme, high redshift sources. Thursday March 25, 2010 xgal_covers.txt 139/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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