Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 231/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #494 Deep spectroscopic observations of a z=4.3 HyLIRG with indications of Pa alpha and PAH emission Principal Investigator: Kalliopi Dasyra Institution: SSC Technical Contact: Kalliopi Dasyra, SSC Co−Investigators: George Helou, IPAC Lee Armus, SSC Mark Lacy, SSC Andreea Petric, SSC Dominik Riechers, Caltech, dr@astro.caltech.edu Brian Siana, SSC Science Category: high−z galaxies Observing Modes: IrsMap Hours Approved: 5.1 Abstract: We request IRS observations of J1717+6009, a z=4.27 source that is an outlier in redshift, IR luminosity, and spectral properties in the 5mJy Spectroscopic Legacy project 5MUSES, which surveyed the XFLS, ELAIS−N1, ELAIS−N2, XMM, and Lockman Hole fields. With rest−frame 4.6 and 13.3 micron luminosities of 5*10^13 L_sun, this source is a bright Hyperluminous Infrared Galaxy. Its rest−frame UV/optical spectra show broad absorption lines that are associated with strong outflows. J1717+6009 is an exceptionally rare candidate for the study of coeval AGN accretion, feedback, and star−formation activity at z>4. It is unique because it shows tentative evidence for both hydrogen recombination and PAH feature emission in the MIR. The existing ~4−min long IRS observations per spectral order, which were obtained after the cycle 5 deadline, have low S/N (4.5−7.5 sigma) detections at the Pa alpha, the PAH 3.3, and the PAH 6.2 micron wavelengths. We request new IRS observations, which will last in total 5.1 hours, to allow for a reliable detection of the 3.3 and 6.2 micron PAH features and several rest−frame NIR hydrogen lines. The flux ratios of NIR and optical/UV hydrogen lines will help us estimate the AGN gas column density. The widths of the broad hydrogen lines can constrain the mass and the accretion rate of the black hole in this AGN. The luminosity of the PAH features will help us estimate the star formation that the host galaxy is undergoing. If successful, these deep observations will establish Spitzer as the observatory to pioneer the detection of PAHs at z>4, and will lay the foundations for the use of the JWST MIRI instrument for the study of star formation up to the era of reionization using the 3.3 micron PAH feature. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 232/742 Spitzer Space Telescope − Theoretical Research Proposal #20283 High−Redshift Galaxies in GOODS: Simulations vs. Observations Principal Investigator: Romeel Dave Institution: University of Arizona Technical Contact: Romeel Dave, University of Arizona Co−Investigators: Kristian Finlator, University of Arizona Science Category: high−z galaxies (z>0.5) Dollars Approved: 50877.0 Abstract: We propose to carry out detailed comparisons of cosmological hydrodynamic simulations of galaxy formation versus Spitzer/IRAC and HST/ACS observations of z~4 "B−dropout" galaxies in the Great Observatories Origins Deep Survey. The goals are to (1) Test whether current simulations of galaxy formation produce results compatible with high−redshift galaxy observations; (2) Constrain model parameters, particularly those associated with dust extinction and galactic feedback; and (3) Provide detailed interpretations of observed broad−band colors in terms of galaxy physical properties such as stellar mass and extinction within a self−consistent cosmological scenario. We will carry out the comparisons by "observing" simulated galaxies through the appropriate broad band filters, computing each galaxy’s magnitudes from its star formation history using population synthesis models. From this, we will gain insights into the physical processes that govern galaxy formation at these epochs, and provide a baseline concordant model that can be used to compare simulations to a wider range of observations such as galaxy clustering, redshift evolution, extragalactic background light, and galaxy properties observed at non−optical/NIR wavelengths. Thursday March 25, 2010 xgal_covers.txt 116/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 233/742 Spitzer Space Telescope − Theoretical Research Proposal #30065 Comparing Simulations and Observations of Reionization−Epoch Galaxies Principal Investigator: Romeel Dave Institution: University of Arizona Technical Contact: Romeel Dave, University of Arizona Co−Investigators: Kristian Finlator, University of Arizona Science Category: high−z galaxies (z>0.5) Dollars Approved: 56649.0 Abstract: We propose to test and constrain models of early galaxy formation through comparisons with observations of reionization−epoch (z>6) galaxies observed using Spitzer. The goals are to (1) Make predictions for z>6 objects using state−of−the−art cosmological hydrodynamic simulations of galaxy formation tailored to study the reionization epoch; (2) Develop a publicly−available tool called SPOC designed to obtain detailed constraints on physical properties of observed galaxies through comparisons with simulated galaxy catalogs; and (3) Use SPOC to test and constrain models of galaxy formation through comparisons with rapidly− advancing observations in the new frontier of early universe studies. The results of this study will yield deeper insights into the galaxy formation process at these mostly unexplored epochs, with implications for understanding the formation of massive galaxies, studying the topology and evolution of IGM reionization, and designing future surveys to detect first objects. The SPOC tool will facilitate a closer connection between observations and theory by enabling the community to interpret data within the framework of current hierarchical structure formation models, in turn providing detailed tests of these models that is essential for driving the field forward. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 234/742 Spitzer Space Telescope − Theoretical Research Proposal #40047 TOGA: A Web Interface for Testing Galaxy Formation Models Against Observations Principal Investigator: Romeel Dave Institution: University of Arizona Technical Contact: Romeel Dave, University of Arizona Co−Investigators: Kristian Finlator, University of Arizona Science Category: high−z galaxies (z>0.5) Dollars Approved: 31706.0 Abstract: Comparisons between galaxy surveys and hierarchical sturucture formation models are a key driver for progress in understanding galaxy formation. In order to facilitate such comparisons, we propose to establish a website to disseminate simulation data in a manner that may be directly compared against galaxy survey data. The website, called TOGA, will enable users to (1) download photometric catalogs (including physical properties) of simulated galaxies from a suite of state−of−the−art hydrodynamic simulations of galaxy formation, and (2) run an SED fitter on individual galaxy photometry to determine the likelihood that a given observed galaxy can be reproduced in a particular model. These tools will enable detailed comparisons between models and data tailored to individual surveys, and will be particularly useful for high−redshift galaxy studies where Spitzer data is crucial for constraining physical properties. The two tools work together to test predictions of both the bulk properties of galaxies and the properties of individual galaxies, enabling the most comprehensive, detailed, and fair model testing possible. The overall goal is to understand in detail the success and especially the failures of current hierarchical galaxy formation models when compared with the rapidly advancing galaxy survey data. The TOGA website will be operational by Fall 2007, with improvements planned throughout 2008. Thursday March 25, 2010 xgal_covers.txt 117/371
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