Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 707/742 Spitzer Space Telescope − Theoretical Research Proposal #40197 Anisotropy in the Cosmic Near Infrared Background: Simulations vs Observations Principal Investigator: Eiichiro Komatsu Institution: University of Texas, Austin Technical Contact: Eiichiro Komatsu, University of Texas, Austin Co−Investigators: Paul Shapiro, University of Texas at Austin Elizabeth Fernandez, University of Texas at Austin Science Category: cosmic infrared background Dollars Approved: 74999.0 Abstract: The goal of the proposed research is to make the most detailed and reliable theoretical prediction for the distribution of fluctuations in the cosmic near infrared background from unresolved high−z galaxies and ionized bubbles at z>7, taking into account the large scale structure as well as inhomogeneous distribution of ionized (HII) bubbles around sources. We shall use both analytical calculations (Fernandez & Komatsu 2006) and numerical simulations (Iliev et al. 2006) for completing this task. In particular we will be the first to use high−fidelity large−scale simulations of the cosmic reionization to calculate fluctuations in the cosmic near infrared background. The results from our research will be made publicly available in the form of simulated maps of the near infrared background as well as the angular power spectrum computed from the simulated maps. Our products should be immediately useful for interpreting the power spectrum of significant fluctuations (Kashlinsky et al. 2007; Cooray et al. 2007) detected in the Spitzer data from the GOODS Spitzer Legacy Program. The data from other Spitzer Legacy Programs, such as S−COSMOS, which do wide−field deep imaging surveys in the near infrared bands, should also benefit from our products. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 708/742 Spitzer Space Telescope − General Observer Proposal #20174 Physics of the Hotspots and Jets in the Powerful Radio Galaxy Cygnus A Principal Investigator: Daniel Harris Institution: Smithsonian Astrophysical Observatory Technical Contact: Daniel Harris, Smithsonian Astrophysical Observatory Co−Investigators: Lukasz Stawarz, Smithsonian Astrophysical Observatory Michal Ostrowski, Jagiellonski University, Poland Chi Teddy Cheung, NRAO and MIT Science Category: extragalactic jets Observing Modes: IracMap Hours Approved: 3.9 Abstract: We propose Spitzer imaging of the archetype powerful radio galaxy Cygnus A with IRAC at 4.5 and 8.0 microns. The main goal of our 3.6 hr observation is to detect and measure the high energy (infrared) portion of the synchrotron spectra of the well−known hotspots. These observations will be compared directly to expectations from different models for high−energy particle acceleration in non−relativistic shocks. Additionally, we aim to study possible manifestations of the propagation of the powerful radio jets which have been revealed tentatively in previous high resolution X−ray and radio spectral imaging. Thursday March 25, 2010 xgal_covers.txt 354/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 709/742 Spitzer Space Telescope − General Observer Proposal #20501 Star Formation and Ionized Gas along the Centaurus A Jet Principal Investigator: Rosina Iping Institution: the Catholic University of America Technical Contact: Rosina Iping, the Catholic University of America Co−Investigators: Susan Neff, NASA’s GSFC George Sonneborn, NASA’s GSFC Science Category: extragalactic jets Observing Modes: IrsMap Hours Approved: 1.9 Abstract: We propose IRS spectral mapping of several distinct environments along the jet of NGC 5128 (Cen A) to determine the characteristics of star formation, dust properties, and shocked gas where the jet interacts with the outer regions of the galaxy. Powerful jets are common phenomena of AGN with massive black holes. The jets carry substantial energy out of AGN and may induce significant star formation along the way. Cen A is the nearest AGN with a powerful jet and a key object for understanding the jet−galaxy interactions. Recently, UV emission was detected by GALEX along the jet of Cen A at distances up to 40 kpc from the AGN. Some of the UV emission is associated young hot stars, whose formation was probably induced by jet−cloud interaction. However, significant amounts of UV emission are detected that are not clearly associated with star formation. Optical emission ([O III], Halpha) may arise from collisionally ionized gas associated with jet shocks, or from photoionization by young stars. IRS 5−15 um spectral mapping of key regions in Cen A, augmented by our GALEX and FUSE observations, will permit us to determine the origin of the hot plasma (shocks or stars) and the distribution of young stars as traced by dust in the star forming region. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 710/742 Spitzer Space Telescope − General Observer Proposal #20455 Deep Imaging of Quasar Jets with IRAC Principal Investigator: Svetlana Jorstad Institution: Boston University Technical Contact: Svetlana Jorstad, Boston University Co−Investigators: Alan Marscher, Boston U., USA Jonathan Gelbord, MIT, USA Herman Marshall, MIT, USA Dan Schwartz, SAO, USA Diana Worrall, SAO & U. of Bristol, UK Mark Birkinshaw, SAO & U. of Bristol, UK Eric Perlman, UMBC, USA Science Category: extragalactic jets Observing Modes: IracMap Hours Approved: 11.9 Abstract: We propose to obtain IRAC images of the jets of 6 quasars that have extended X−ray and radio emission, with bright knots on arcsecond scales. The resulting mid−IR images combined with existing X−Ray/optical/radio measurements will allow us to obtain the spectral energy distributions (SED) for each of roughly 30 knots from 10E9 to 10E18 Hz . This is crucial information to decide between two competing high−energy radiation processes − inverse Compton scattering and synchrotron radiation. The SEDs will be used to infer the values of the Doppler beaming factor, magnetic field, and density and cutoffs of the electron energy distribution for the knots. These parameters are needed to calculate the kinetic power of the most luminous quasar jets, which have been estimated to range from 1E46 to extreme values exceeding 1E49 erg/s. From this study, we will be able to determine the extent to which the jet decelerates significantly with distance from the nucleus and how the efficiency of ultra−high−energy particle acceleration depends on location and morphology. Thursday March 25, 2010 xgal_covers.txt 355/371
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