Extragalactic abstracts - IRSA - California Institute of Technology
Extragalactic abstracts - IRSA - California Institute of Technology
Extragalactic abstracts - IRSA - California Institute of Technology
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Spitzer_Approved_<strong>Extragalactic</strong><br />
Mar 25, 10 16:24 Page 259/742<br />
Spitzer Space Telescope − General Observer Proposal #40363<br />
Deep MIPS−70 and 160−micron Imaging <strong>of</strong> the z=1.16 SMG−P4<br />
Principal Investigator: David Frayer<br />
Institution: <strong>California</strong> <strong>Institute</strong> <strong>of</strong> <strong>Technology</strong><br />
Technical Contact: David Frayer, <strong>California</strong> <strong>Institute</strong> <strong>of</strong> <strong>Technology</strong><br />
Co−Investigators:<br />
Harry Teplitz, IPAC<br />
Lee Armus, IPAC<br />
Minh Huynh, IPAC<br />
Science Category: high−z galaxies (z>0.5)<br />
Observing Modes: MipsPhot<br />
Hours Approved: 3.5<br />
Abstract:<br />
We propose deep MIPS−70 and 160−micron observations <strong>of</strong> the z=1.16 submillimeter<br />
galaxy (SMG) P4. SMG−P4 is a composite AGN+starburst system showing large PAH<br />
equivalent widths indicating that the infrared emission arises predominantly<br />
from star−formation activity. The current data suggest that the far−infrared<br />
(FIR) spectral energy distribution (SED) is shifted to lower dust temperatures<br />
(cooler FIR colors) than that found for most local ULIRGs, but is consistent<br />
with the constraints on the high−redshift SMGs from ultradeep 70−micron imaging.<br />
Observations at 70 and 160−micron near the FIR peak are needed to constrain the<br />
SED, bolometric luminosity, star formation rate, and dust mass <strong>of</strong> the system.<br />
Spitzer_Approved_<strong>Extragalactic</strong><br />
Printed_by_SSC<br />
Mar 25, 10 16:24 Page 260/742<br />
Spitzer Space Telescope − General Observer Proposal #20643<br />
Testing the Preposterous Universe with Infrared Supernovae<br />
Principal Investigator: Peter Garnavich<br />
Institution: University <strong>of</strong> Notre Dame<br />
Technical Contact: Peter Garnavich, University <strong>of</strong> Notre Dame<br />
Co−Investigators:<br />
Chris Stubbs, Harvard−Smithsonian Center for Astrophysics<br />
Brian Schmidt, The Australian National University<br />
Robert Kirshner, Harvard−Smithsonian Center for Astrophysics<br />
Nicholas Suntzeff, CTIO/NOAO<br />
Chris Smith, CTIO/NOAO<br />
John Tonry, University <strong>of</strong> Hawaii<br />
Alex Filippenko, University <strong>of</strong> <strong>California</strong>, Berkeley<br />
Kevin Krisciunas, Notre Dame<br />
Peter Challis, Harvard−Smithsonian Center for Astrophysics<br />
Bruno Leibundgut, European Southern Observatory<br />
Adam Riess, STScI<br />
Thomas Matheson, NOAO<br />
Armin Rest, CTIO/NOAO<br />
Alejandro Clocchiatti, Universidad Catolica de Chile<br />
Saurabh Jha, University <strong>of</strong> <strong>California</strong>, Berkeley<br />
Gajus Miknaitis, University <strong>of</strong> Washington<br />
Andy Becker, University <strong>of</strong> Washington<br />
Jason Spyromilio, European Southern Observatory<br />
Weidong Li, University <strong>of</strong> <strong>California</strong>, Berkeley<br />
Jesper Sollerman, Stockholm Observatory<br />
Michael Wood−Vasey, Harvard−Smithsonian Center for Astrophysics<br />
Maria Elena Salvo, The Australian National University<br />
Claudio Aguilera, CTIO/NOAO<br />
Ryan Chornock, University <strong>of</strong> <strong>California</strong>, Berkeley<br />
Stephane Blondin, European Southern Observatory<br />
Malcolm Hicken, Harvard−Smithsonian Center for Astrophysics<br />
Science Category: high−z galaxies (z>0.5)<br />
Observing Modes: IracMap<br />
Hours Approved: 83.4<br />
Abstract:<br />
The current standard cosmological model has been called "preposterous" because<br />
it requires a finely tuned dark energy component. We propose a stringent test <strong>of</strong><br />
the accelerating universe using type Ia supernovae observed in the infrared<br />
rest−frame $K$−band. At redshifts near z=0.6, the K−band slides nicely into the<br />
IRAC 3.6 micron band. The infrared has a number <strong>of</strong> exceptional properties. The<br />
effects <strong>of</strong> dust extinction are minimal, reducing a major systematic that has<br />
been suspected <strong>of</strong> dimming high−redshift supernovae. Also, recent work indicates<br />
that type Ia supernovae are true standard candles in the infrared meaning that<br />
evolutionary biases will be reduced. We find that good signal−to−noise<br />
measurements <strong>of</strong> 4 type Ia events at z~0.6 will differentiate between an<br />
accelerating and low−density universe at more than the 99% confidence level, and<br />
make a critical test <strong>of</strong> the dark energy paradigm. Studying high redshift<br />
supernovae in the infrared is not possible from the ground and rest−frame K−band<br />
observations can only be done with Spitzer and IRAC. NASA and DOE are currently<br />
considering the optimum mission concept to investigate the properties <strong>of</strong> the<br />
dark energy. This proposed experiment will test the feasibility <strong>of</strong> using SNIa in<br />
the infrared as a reliable way <strong>of</strong> mapping the expansion history <strong>of</strong> the universe<br />
with the Joint Dark Energy Mission.<br />
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