Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 395/742 Spitzer Space Telescope − General Observer Proposal #3247 Spirals, Bridges and Tails: Star Formation and the Disturbed ISM in Colliding Galaxies before Merger. Principal Investigator: Curtis Struck Institution: Iowa State University Technical Contact: Curtis Struck, Iowa State University Co−Investigators: Philip Appleton, IPAC Vassilis Charmandaris, Cornell University William Reach, IPAC Beverly Smith, East Tennessee State University Science Category: interacting/merging galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 31.4 Abstract: We propose to use Spitzer’s unprecedented sensitivity and wide spatial and spectral evolution to study the distribution of star formation in a sample of colliding galaxies with a wide range of tidal and splash structures. Star forming environments like those in strong tidal spirals, and in extra−disk structures like tails were probably far more common in the early stages of galaxy evolution, and important contributors to the net star formation. Using the Spitzer data and data from other wavebands, we will compare the pattern of SF to maps of gas and dust density and phase distribution. With the help of dynamical modeling, we will relate these in turn to dynamical triggers, to better understand the trigger mechanisms. We expect our observations to complement both the SINGS archive and the archives produced by other GO programs, such as those looking at merger remnants or tidal dwarf formation. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 396/742 Spitzer Space Telescope − General Observer Proposal #3403 A Mid/Far−Infrared Imaging Survey of Advanced Major−Merger Remnants: Fine−Structure Elliptical Galaxies Principal Investigator: Jason Surace Institution: Spitzer Science Center Technical Contact: Jason Surace, Spitzer Science Center Co−Investigators: John Hibbard, National Radio Astronomy Observatory Francine Marleau, Spitzer Science Center, Caltech Lin Yan, Spitzer Science Center, Caltech Aaron Evans, Stony Brook University Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 11.9 Abstract: We propose to observe in the mid and far−infrared twelve moderate−age elliptical galaxies which are believed to be the direct descendants of major galaxy−galaxy mergers. The new observations will trace the old stellar population as well as reveal the presence, physical characteristics, and distribution of any dust present in the systems. The observations will help connect the heavily−studied, very dusty starburst−dominated mergers seen locally and "normal" elliptical galaxies, and provide insight into the behavior of stars and dust in late−stage mergers. Thursday March 25, 2010 xgal_covers.txt 198/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 397/742 Spitzer Space Telescope − General Observer Proposal #30603 Probing the Distribution of Star Formation and Dust in a Unique, Transforming Spiral Galaxy Principal Investigator: Todd Tripp Institution: University of Massachusetts Technical Contact: Todd Tripp, University of Massachusetts Co−Investigators: Limin Song, University of Massachusetts Min Yun, University of Massachusetts David Bowen, Princeton University Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 2.7 Abstract: We have identified a spiral galaxy (NGC4319) that appears to be in the process of transforming into an S0 galaxy. This spiral is embedded in X−ray emitting hot gas in the NGC4291 group, and it appears that ram pressure has stripped most of the H~I out of the galaxy making it H~I deficient and molecule−rich. Using a background Seyfert galaxy behind NGC4319, we have detected an array of ultraviolet absorption lines from the ISM of NGC4319 using high−resolution spectrographs on HST and FUSE. We find that the H~I column density is surprisingly low, but nevertheless we detect 17 absorption lines of H_2 from the J = 0, 1, 2, and 3 rotational levels. We have also observed the galaxy with the FCRAO 14m telescope, and we detect CO emission from the barred center. Here we propose to map NGC4319 and 3 nearby companion galaxies (in the same group) with IRAC and MIPS to investigate the following questions: (1) How does ram pressure and tidal stripping affect star formation in NGC4319? (2) Is there hidden spiral structure in the 3 companion S0 and elliptical galaxies (e.g., as observed by Pahre et al. in other lenticulars)? (3) How has ram pressure and tidal stripping affected the dust in these galaxies? (4) Is dust being ejected into the IGM of the group? Combined with our unique information from ultraviolet spectroscopy already obtained, this program will provide valuable insight on the effects of ram pressure and tidal stripping on galaxy evolution. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 398/742 Spitzer Space Telescope − General Observer Proposal #3187 The Evolution of Activity in Massive Gas−Rich Mergers Principal Investigator: Sylvain Veilleux Institution: University of Maryland Technical Contact: Sylvain Veilleux, University of Maryland Co−Investigators: Reinhard Genzel, MPE, UC Berkeley [co−PI] Eckhard Sturm, MPE [Project Scientist] Dieter Lutz, MPE Linda Tacconi, MPE Matthew Lehnert, MPE Alessandra Contursi, MPE David Sanders, University of Hawaii, Institute for Astronomy Robert Joseph, University of Hawaii, Institute for Astronomy Alan Stockton, University of Hawaii, Institute for Astronomy Josh Barnes, University of Hawaii, Institute for Astronomy Joe Mazzarella, IPAC, Caltech Steve Lord, IPAC, Caltech Hagai Netzer, Tel Aviv University Amiel Sternberg, Tel Aviv University Chris Mihos, Case Western Reserve University Olivier Guyon, Subaru Telescope Kaliopi Dasyra, MPE Science Category: interacting/merging galaxies Observing Modes: IrsStare Hours Approved: 95.3 Abstract: We wish to study in detail the basic physical processes involved in creating massive early type hosts on the one hand, and growing/feeding embedded massive black holes on the other hand, in major galaxy mergers. This is an important question since 50% of cosmic star formation at high−z and most of the big BHs appear to be formed in this process, which we need to better understand in a local laboratory, in order to apply this knowledge to high z. We want to test the ‘Sanders’ (1988) scenario that massive ellipticals as well as QSO−like (> 10^8 Msun) black holes are formed when two big, gas rich galaxies merge. We want to understand how and at what rate during the various stages of the merger black holes are fed and grow in mass. We want to verify whether the output BHs are typical of QSOs and whether this process adheres to the local BHmass−sigma relationship. Our approach is unique and goes much beyond the proposed GTO and Legacy programs in this area. Taking an unbiased set of 54 local Universe active mergers and QSOs, we first need to fully understand the structural properties of each galaxy merger as well as the time/phase at which we see it. This we get from our near−IR/optical data sets, which is the first such complete investigation. Then we need to assign to each system the amount of radiation/energy produced in star formation and BH accretion. This information we get (and only can obtain) from mid−IR spectroscopic data which will be acquired with SST. The SST data we propose to get for the first time allow obtaining the key fine−structure line diagnostics for a large sample, and for the first time, for QSOs. With our previous ISO spectroscopy we have pioneered the basic technique. Here we wish to apply these techniques to a full sample that allows the exploration of evolution. Thursday March 25, 2010 xgal_covers.txt 199/371
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