Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 283/742 Spitzer Space Telescope − General Observer Proposal #40801 Deep IR imaging of Submillimeter Galaxies detected by SMA: Unambiguously Identifying SMGs at High Redshifts Principal Investigator: Jiasheng Huang Institution: Smithsonian Astrophysical Observatory Technical Contact: Jiasheng Huang, Smithsonian Astrophysical Observatory Co−Investigators: Mat Ashby, SAO Joshua Younger, Harvard University Giovanni Fazio, SAO Grant Wilson, Univ. of Massachusetts at Amherst Min Yun, Univ. of Massachusetts at Amherst Tracy Webb, McGill Univ. David Sanders, Univ. of Hawaii Nick Scoville, Caletch David Hughes, Inaoep Itziar Aretxaga, Inaoep James Lowenthal, Smith College David Wilner, SAO Lin Yan, SSC Emeric Le Floc’h, Univ. of Hawaii Olivier Ilbert, Univ. of Hawaii Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsPeakupImage MipsPhot Hours Approved: 37.4 Abstract: In 2007 January, we detected no fewer than five AzTEC 1.1 mm galaxies via high−resolution interferometric imaging with the Sub−Millimeter Array (SMA) atop Mauna Kea at 890 microns. Despite the fact that these sources are all radio−quiet SMGs, with the high S/N SMA detections in the narrow SMA beam we unambiguously determine the position of the AzTEC galaxies with subarcsecond accuracy. All the counterparts, which lie in the SCOSMOS survey, are detected by IRAC at 3.6 and 4.5 microns in the existing SCOSMOS mosaics. Only two are detected at the longer IRAC wavelengths, however, and none are detected in the existing 24 micron data. Furthermore, only two are detected at optical wavelengths. These sources thus present (incomplete) SEDs that appear consistent with their being either 1. deeply dust−enshrouded galaxies at z=2, or 2. a distant z=4 population of very luminous objects. Because they are so optically faint, only broadband imaging such as Spitzer can provide will permit construction of their rest−frame optical−near−IR SEDs. This appears to be the only way to discriminate between the two possibilities for the origin of SMGs that are radio−quiet. Accordingly, we ask for 37.4 h to carry out a very deep imaging program utilizing all three Spitzer instruments to construct the SEDs for the four SMGs in our sample. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 284/742 Spitzer Space Telescope − General Observer Proposal #30526 Star formation rates in a sample of redshift 6.6 galaxies Principal Investigator: Esther Hu Institution: University of Hawaii Technical Contact: Esther Hu, University of Hawaii Co−Investigators: Lennox Cowie, Institute for Astronomy Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 13.6 Abstract: We propose to observe a sample of six spectroscopically confirmed Lyman alpha emitting galaxies at a redshift of 6.6. These objects, which were found using wide field narrow band imaging, lie in a small filament in the outer regions of the SSA22 field. Because of their spatial grouping they can be efficiently observed with IRAC to obtain their rest frame optical spectral energy distributions and to measure the strength of the H alpha line which lies in the 4.5 micron channel. We will combine this with measurements of the rest frame UV from Nicmos/HST observations to estimate star formation rates and limits on the dust extinction from these objects and to determine if there is evidence of earlier star fomation in these galaxies. We will use the measured star formation rates for the individual galaxies and the measured number densities from the wide field surveys to estimate the cosmic star formation densities contributed by the Lyman alpha emiiting galaxies at these redshifts and compare this with results derived from color break galaxy searches. Thursday March 25, 2010 xgal_covers.txt 142/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 285/742 Spitzer Space Telescope − General Observer Proposal #20218 Unveiling the Evolution of Lyman Break Galaxies: IRAC Survey of GOODS−N Flanking Fields Principal Investigator: Ikuru Iwata Institution: National Astronomical Observatory of Japan Technical Contact: Ikuru Iwata, National Astronomical Observatory of Japan Co−Investigators: Kouji Ohta, Dpt. Astronomy, Kyoto Univ. Masayuki Akiyama, Subaru Telescope, NAOJ Kentaro Aoki, Subaru Telescope, NAOJ Naoyuki Tamura, Dpt. of Physics, Univ. of Durham, UK Gaku Kiuchi, Dpt. Astronomy, Kyoto Univ. Mataka Andoh, Dpt. Astronomy, Kyoto Univ. Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 13.0 Abstract: We propose a wide−field IRAC survey of the "flanking fields" of the northern Great Observatories Origins Deep Survey (GOODS) field, where we have deep optical images and have selected a sample of LBGs at z ~ 5. With IRAC we intend to wipe an about 300 sq. arcmin field with sensitivity sufficient to detect relatively bright LBGs, z(AB)< 24.5. Using LBGs’ flux densities from rest−frame UV to near−infrared wavelengths we aim to constrain the star formation history of them and estimate their ages and stellar mass. Although past works using optical to near−infrared images have succeeded in depicting the history of mass assembly up to z = 3, there has never been information at z > 4. The capability of Spitizer in deep imaging at mid−IR should enable us to open the door to the higher redshift. Since our observation will increase the number of bright LBGs which must be rare in a deeper and narrower survey, it is complementary to the GOODS only with an expense of about 13 hours. From the studies we have made so far it is found that there is a hint of an evolution of LBG population from z~5 to z~3 (i.e., from the cosmic age of 2 Gyr to 1 Gyr), and the luminosity dependence ("down−sizing") in the evolution process of LBGs is suggested. So our LBG sample should provide indispensable clues to understand the evolutionary process of galaxies in the early universe. The detailed properties such as morphology, spectral features, metallicity of bright LBGs are being examined with follow−up observations. In addition, by the comparison of IRAC images and deep optical images, we will construct a large sample of luminous MIR−bright galaxies at 2.5 < z < 3.5. They would be dusty star forming galaxies and passively evolving massive galaxies undetected through Lyman break technique, and should enable us to make an unbiased view of galaxies at z~3. Since the data are for the flanking fields of a multi−band very deep survey, they should be valuable for wide range of studies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 286/742 Spitzer Space Telescope − General Observer Proposal #40957 An Independent search for Starbursting/AGN components within a Lyman Alpha Blob at High Redshift Principal Investigator: Matt Jarvis Institution: University of Hertfordshire Technical Contact: Daniel Smith, Oxford University Co−Investigators: Daniel Smith, University of Oxford Mark Lacy, Spitzer Science Center Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 2.0 Abstract: We propose to image a newly discovered Lyman Alpha Blob thought to be ionized by a "cold accretion" process using MIPS at 24 um, and all four IRAC channels. The ionizing sources of Lyman Alpha Blobs remain unclear; these observations are designed to provide an independent test for the presence of starbursting or AGN components. Thursday March 25, 2010 xgal_covers.txt 143/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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