Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 731/742 Spitzer Space Telescope − General Observer Proposal #30670 Evolution of Compact Extreme Starburst Galaxies Principal Investigator: James Lowenthal Institution: Smith College Technical Contact: James Lowenthal, Smith College Co−Investigators: Matthew Bershady, University of Wisconsin Jesus Gallego, Universidad Complutense de Madrid Rafael Guzman, University of Florida Salman Hameed, Hampshire College David Koo, UCO/Lick Observatory Science Category: starburst galaxies Observing Modes: IracMap MipsPhot Hours Approved: 45.8 Abstract: The global SFR was tenfold greater at z=1 than at z=0, and "downsizing" scenarios of galaxy formation maintain that the strong evolution in SFR progresses from high− to low−mass systems with time. Meanwhile, large reservoirs of star formation previously hidden from the optical by obscuring dust are being uncovered in the IR and submm in diverse populations of galaxies over a wide range of redshift. We propose deep IRAC imaging and MIPS photometry of a unique sample of well−studied 26 extreme starburst galaxies, half of them nearby HII galaxies and the other half luminous compact blue galaxies (LCBGs) at redshift z~0.5. These intensely starforming but mostly low−mass systems, like their massive cousins the ultraluminous infrared galaxies (ULIRGs), apparently evolve significantly: they can account for as much as 40% of the increase in global SFR observed between z=0 and z=1. They may also include local analogs of Lyman break galaxies at z~3, and are probably the same class of UV−bright starbursts recently observed in the local universe with GALEX. Coverage of our sample has two significant advantages over other multiwavelength surveys: spatially resolved HST/STIS−UV and optical imaging and spectroscopy, and high spectral and spatial resolution 2D spectroscopy with Keck/HIRES. Thus we can measure important physical parameters that are unavailable with the FLS, EGSS, GOODS, and other surveys. Our main science goal is (1) to use the mid− and far−IR emission to measure optically obscured star formation from z~1 to z=0 as a function of dynamical mass and rest−UV size and morphology; this will directly address inconsistencies in our current downsizing picture of galaxy evolution and the role of compact extreme starbursts. We also plan (2) to compare the SEDs of our samples to those of LBGs, to test the hypothesis that LCBGs include local analogs of LBGs; and (3) to measure the starbursts’ stellar masses in the rest−NIR, which is necessary for analysis of SFH, b parameter, and their cosmic evolution. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 732/742 Spitzer Space Telescope − General Observer Proposal #20528 Exploring the Dust Content of Galactic Winds with MIPS Principal Investigator: Crystal Martin Institution: University of California Santa Barbara Technical Contact: Crystal Martin, UCSB Co−Investigators: Karl Gordon, Steward Observatory Charles Engelbracht, Steward Observatory Science Category: starburst galaxies Observing Modes: MipsPhot MipsScan Hours Approved: 45.0 Abstract: This program explores the dust content of galactic winds. Nearly half of all stars in the universe probably form in a starburst event, where high concentrations of supernova explosions drive galactic−scale gaseous outflows. In nearby starburst galaxies, winds have been mapped at radio, optical, and X−ray frequencies revealing bipolar lobes of hot gas laced with cooler filaments bubbling out of the host galaxy. Most of the outflowing material is entrained interstellar gas, so it will remain quite dusty unless the grains are destroyed. Dusty winds have significant implications for the circulation of heavy elements in galaxies, the dust content of the intergalactic medium, and the acceleration of gaseous outflows. GALEX images of scattered ultraviolet light from galactic winds now provide compelling evidence for the survival of some grains. MIPS photometry of starburst winds at 24, 70, and 160 microns can, in principle, measure the dust temperature providing accurate estimates of the amount of dust (e.g. Engelbracht et al. 2004). To date, however, most MIPS observations of starburst galaxies are far too shallow to detect thermal emission from halo dust. The requested observations would provide the most sensitive observations currently possible for a sample of starburst galaxies, selected to span the full range of starburst luminosity and spatial geometry in the local universe. Thursday March 25, 2010 xgal_covers.txt 366/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 733/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50162 Tracing the History of Star Formation and Accretion with a Deep Spitzer/Radio Survey Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Jennifer Donley, University of Arizona Co−Investigators: Nick Seymouor, SSC Tom Dwelly, University of Southampton Ian McHardy, University of Southampton Jennifer Donley, Steward Observatory Mat Page, MSSL Andrew Hopkins, University of Sydney Nic Loaring, SALT Science Category: starburst galaxies Observing Modes: MipsScan Hours Approved: 21.6 Abstract: At the faint flux densities reached by the deepest radio surveys (2; a method that is free from many of the assumptions (e.g. dust attenuation) typically made when measuring star formation rates. However, a significant minority of the faint radio population is accretion powered (i.e. by AGN), and such objects must first be removed from the SFG sample before we can e.g. measure the cosmic star formation rate density. Determining the power source behind the faintest radio sources is difficult due to their typically low luminosities at optical/NIR wavelengths. We have explored a range of measures such as radio morphology, radio spectral index and radio−to−24um flux density ratio to determine the power source (AGN or SFG) for faint radio sources detected in our VLA/GMRT/MERLIN/Spitzer survey field. We find that the radio−to−24um flux density ratio discriminator is particularly effective at separating AGN and SFRG powered radio sources, but unfortunately our current 24um MIPS data are not sufficiently deep to allow secure classification of radio sources below ~100uJy − the flux range where SFGs are expected to become the dominant radio population. Therefore we request further deep MIPS observations of our field in order to apply the radio−to−24um discrimination method to our entire radio sample. With this Spitzer data we will be able to make an independent measure of the cosmic star−formation rate density, and determine the radio luminosity function of starforming galaxies to z~2. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 734/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #24 Studies of the broad 22−micron feature Principal Investigator: Thomas Roellig Institution: NASA Ames Research Center Technical Contact: Thomas Roellig, NASA Ames Research Center Science Category: starburst galaxies Observing Modes: IrsMap IrsStare Hours Approved: 28.4 Abstract: Recently a broad 22 um feature has been observed in H II regions and starburst galaxies. We are planing further studies of this feature and its relationship with starburst galaxies. Supernovae are very likely the major production source of this broad 22 um dust feature and the strength of the feature can be used to trace the supernova rate in a galaxy. We plan to use the IRS to observe a sample of galaxies with different degree of starburst activities, with the goal of studying the strength of the 22 um feature strength and its relationship to starburst activity. In addition, we also plan to map the Carina Nebula where the 22 um feature was previously observed, with the goal of studying the excitation mechanism of this feature and the identification of its carrier. Finally, we will also observe the 22 micron feature in two supernova remnants. Thursday March 25, 2010 xgal_covers.txt 367/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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