Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 303/742 Spitzer Space Telescope − General Observer Proposal #20229 Cosmic Evolution of Dust and Star Formation: Emission Line Galaxies in the Subaru Deep Field Principal Investigator: Matthew Malkan Institution: UCLA Technical Contact: Matthew Malkan, UCLA Co−Investigators: Kazu Shimasaku, University of Tokyo Nobunari Kashikawa, National Astronomical Observatory of Japan Masanori Iye, National Astronomical Observatory of Japan Kentaro Motohara, Institute of Astronomy, Univ. of Tokyo Tadayuki Kodama, National Astronomical Observatory of Japan Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 29.4 Abstract: The Subaru Deep Field (SDF) is the only large (770 sq arcmin) region of the sky with ultradeep optical, UV, near−IR and narrowband imaging. The latter has provided 2600 galaxies with Balmer, [OIII], [OII, or Lyalpha emission lines. Our extensive followup spectroscopy has confirmed the reliability of this method of selecting star−forming galaxies in 9 redshift windows from z=0.1 to 1.5. With a deep MIPS−24 observation we will obtain a definitive calibration of reddening−corrected star formation rates using the 3 leading indicators−−UV continuum from young stars, optical emission lines from HII regions, and thermal re−radiation from warm dust. The direct comparison of 3 independent methods in the same galaxy sample will allow us to determine the role played by dust extinction, and to correct for it accurately. We wil thenl derive the cosmic evolution of star formation from a look−back time of 10 Gyrs to the present in typical galaxies, not just those in the high end of the luminosity function. With deep IRAC photometry for the same field, we will optimize our photometric redshift estimates, and determine the total stellar masses of many thousands of galaxies. These will include optical line−emitters, Lyman break galaxies, Lyman−alpha emitters and red galaxies over wide spans of redshift. We will measure where the stars form, as well as when, and determine how star formation correlates with galaxy mass as a function of cosmic time. Our field of view is large enough to overcome cosmic variance, and also to measure the clustering properties of these various groups of galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 304/742 Spitzer Space Telescope − General Observer Proposal #30008 Identifying z>7 galaxies from J−dropouts Principal Investigator: Matthew Malkan Institution: UCLA Technical Contact: Matthew Malkan, UCLA Co−Investigators: Alaina Henry, UCLA Harry Teplitz, Spitzer Science Center James Colbert, Spitzer Science Center Brian Siana, Spitzer Science Center Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 7.0 Abstract: NICMOS Parallel Imaging campaigns covered enough sky (250 pointings) with enough sensitivity in the 110W and 160W filters to identify 6 extremely red resolved sources which are prime candidates for J−band dropouts. Their complete absence of detectable J band flux can be caused by an opaque Lyman cut−ff at z=8−−10. We propose to followup these candidates with NICMOS imaging and jointly propose Spitzer IRAC photometry. Deep F110W and Spitzer/IRAC 3.5/4.8 micron imaging will confirm if any of these candidates are indeed Lyman Break galaxies observed less than 500 Myrs after the Big Bang. Genuine LBGs will remain undetected in F110W, while being detected with flat spectra in the IRAC bands. The combined SED will provide information about the stellar mass of these galaxies, and the possible presence of evolved stars or dust reddening. The proposed observations will be sensitive enough to detect the F110W flux from galaxies as red as (J−H)=2.8 (AB mags, 5 sigma). If any of the candidates are detected with bluer colors, they will most likely be exceptional Distant Red Galaxies at z of 4 to 6. The proposed data will constrain the stellar populations of these extraordinarily red galaxies, which would be candidates for the earliest, most massive galaxies which formed. Thursday March 25, 2010 xgal_covers.txt 152/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 305/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #296 Confirming a z~10 galaxy with IRAC Principal Investigator: Matthew Malkan Institution: UCLA Technical Contact: Alaina Henry, UCLA Co−Investigators: Alaina Henry, UCLA James Colbert, SSC Brian Siana, SSC Harry Teplitz, SSC Patrick McCarthy, OCIW Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 11.2 Abstract: The NICMOS Parallel Survey covered enough sky to find rare, luminous J−dropout Lyman Break Galaxies (LBGs) at z>8. We used IRAC to observe six LBG candidates with extemely red J110−H160 colors. One of these has the blue H160 − IRAC2 color expected of a z=10 galaxy. It remains undetected in IRAC1, suggesting the presence a Balmer/4000 Angstrom break. These extreme colors make this galaxy the best known z=10 candidate. The best fit photometric redshift is z=9.6, although some degeneracy remains, and the galaxy can be fit (less well) by a z=2.5 model. To break this degneracy, we propose deep IRAC observations to detect the source in channels 1 and 3. With this five point SED, we will not only determine the redshift− we will also constrain properties such as extinction. If this galaxy is confirmed as a z=10 LBG, it has important implications for galaxy formation and models which describe the reionization of the intergalactic medium. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 306/742 Spitzer Space Telescope − General Observer Proposal #50057 Uncovering the First Galaxies Principal Investigator: Matthew Malkan Institution: UCLA Technical Contact: Alaina Henry, UCLA Co−Investigators: Alaina Henry, University of California, Los Angeles James Colbert, Spitzer Science Center Brian Siana, Spitzer Science Center Harry Teplitz, Spitzer Science Center Patrick McCarthy, Carnegie Observatories Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 22.2 Abstract: The identification of UV−luminous sources at the epoch of reionization is just barely possible with current technology, requiring large area coverage and tremendous depth in the near− and mid−IR. In Spitzer Cycle 3, we demonstrated that the combination of HST pure parallel NICMOS imaging and Spitzer/IRAC followup identifies good candidates for LBGs at 76 can reionize the intergalactic medium. Such luminous galaxies at very high redshift would provide an ionizing background which is sufficient fo ionize the intergalactic medium−− something which fainter galaxies, alone, may not be able to do. Even if no candidate galaxies are confirmed by the proposed observations, we will place stringent upper limits on the reionizing photons present at z>7. Thursday March 25, 2010 xgal_covers.txt 153/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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