Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 387/742 Spitzer Space Telescope − Theoretical Research Proposal #30183 Infrared Predictions from Simulations of Merging Galaxies Principal Investigator: Patrik Jonsson Institution: University of California, Santa Cruz Technical Contact: Patrik Jonsson, University of California, Santa Cruz Co−Investigators: T.J. Cox, Harvard University/CfA Brent Groves, Max−Planck Institute for Astrophysics Jennifer Lotz, NOAO Joel Primack, University of California, Santa Cruz Science Category: interacting/merging galaxies Dollars Approved: 100145.0 Abstract: We propose to develop a radiative−transfer model which can create panchromatic simulated observations from hydrodynamic simulations. With such a model it will be possible to make detailed predictions of Spitzer observations such as IRAC/MIPS fluxes and IRS spectra. The model, which will be based on a new Monte−Carlo implementation enabling unprecedented spectral resolution, will include a photoionization model of star−forming regions, PAH emission and dust−induced infrared spectral features like silicate absorption. We will then use this model in our ongoing program of simulating interacting and merging galaxies and generate a public library of IR images and spectra which can be compared directly to Spitzer observations of interacting galaxies. The particular strength of these simulations is the inherent connection between the dynamical state of the galaxies, such as morphology and star−formation rate, and the predicted infrared luminosities, colors and spectral features. Using these outputs, we will investigate whether observed IR−luminous galaxies at redshifts around 1, as observed in recent deep redshift surveys, and galaxies at higher redshift, as seen by SCUBA, are merger−driven starbursts. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 388/742 Spitzer Space Telescope − General Observer Proposal #20671 Unveiling the hidden star forming regions in interacting galaxies Principal Investigator: Ernest Krmpotic Institution: Max Planck Institut fuer Astronomie Technical Contact: Ernest Krmpotic, Max Planck Institut fuer Astronomie Co−Investigators: Ulrich Klaas, Max Planck Institut fuer Astronomie Dietrich Lemke, Max Planck Institut fuer Astronomie Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 3.5 Abstract: We propose to map 6 closely interacting galaxy pairs with the IRAC and MIPS cameras on board the Spitzer Space Telescope. The selected luminous infrared galaxy pairs (Lfir~1−15 x 10^10 Lsun) have 100micron flux densities greater than 10 Jy and typical extent of 2−3 arcmin with nuclei separations between 45 and 150 arcsec. The objects exhibit low f60/f100 ratios indicative for large amounts of cold dust. The galaxy interactions are known to play a crucial role in triggering starbursts by means of redistribution of ISM due to strong tidal forces. We expect the dust to fragment in individual knots and to be in different evolution stages; hence that very cold dust concentrations, expected to be in pre−starburst phase, can coexist with those heated by already active starburst. Taking into account the unprecedented sensitivity and spatial resolution of Spitzer combined with the spatial scale and sufficient brightness of the objects, we set our goals to resolve the individual dust knots of down to 5% of the integral flux. These observatinos will contribute an essential part to the multi wavelength dataset of our full sample of 12 interacting galaxy pairs. For the majority of the sample we already have obtained the data in the submm/mm and NIR wavelength regime. The completed datarecord will enable us to address some of the intriguing questions of star formation/starbursts on the galactic scale, e.g.: 1) Location and extent of the starburst activity inside an interacting galaxy pair; 2) The determination of the number of dust knots, including their masses and evolutionary status; 3) The strength of the starburst activity in dependence of the projected distance; 4) The influence of the galaxy structure and the orbital dynamics of the encounter on the gas dynamics and the evolution. Thursday March 25, 2010 xgal_covers.txt 194/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 389/742 Spitzer Space Telescope − General Observer Proposal #40459 A mid−infrared study of Hickson Compact Groups: Probing the Effects of Environment in Galaxy Interactions Principal Investigator: Emeric Le Floc’h Institution: Institute for Astronomy, University of Hawaii Technical Contact: Emeric Le Floc’h, IfA, U. Hawaii Co−Investigators: Vassilis Charmandaris, University of Crete Manolis Xilouris, National Observatory of Athens Martha Haynes, Cornell University Sara Slater, Harvard University Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 7.3 Abstract: It has become increasingly evident that interactions and the merging of galaxies have contributed substantially to their evolution, both in terms of their stellar population and their morphological appearance. Since truly isolated galaxies are the exception rather than the rule, the immediate environment of galaxies has therefore direct implications on their dynamical evolution. Here we propose to use the unique imaging capabilities of Spitzer to study with IRAC and MIPS a sample of 13 Hickson Compact Groups (HCGs) for which we have already obtained the deepest near−IR images to−date. HCGs are systems of 4 or more galaxies located within a small area on the sky and that exhibit evidence of interactions. Reflecting a strong local density enhancement, they occupy a unique position in the framework of galaxy evolution, bridging the range of galaxy environments characteristic of the field, loose groups and rich clusters. However, the lack of deep high spatial resolution wide field mid−IR imaging of those systems has so far left open numerous questions regarding the star forming properties of their member galaxies: are compact groups a transient dynamical phenomenon? How do they evolve? Is their compact configuration the precursor to the formation of field ellipticals? Are they characterized by warm infrared colors as the interacting galaxy pairs or is star formation suppressed as in the center of rich clusters? Are they dynamically closed systems or can they replenish the intergalactic medium with reprocessed material in the form of star forming tails or dwarf galaxies? The Spitzer observations will allow us to address all these issues and to estimate for the first time the distribution and the total dust content in these groups. Such data will add in a systematic way a missing piece to the puzzle of how the proximity of several interacting galaxies affects their evolution. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 390/742 Spitzer Space Telescope − General Observer Proposal #50191 Pushing star formation to the limit: probing the Schmidt−Kennicutt law in extreme environments Principal Investigator: Ute Lisenfeld Institution: Universidad de Granada Technical Contact: Ute Lisenfeld, Universidad de Granada Co−Investigators: Vassilis Charmandaris, University of Crete, Greece Pierre−Alain Duc, Saclay, France Jonathan Braine, Observatoire de Bordeaux, France Elias Brinks, University of Hertfordshire, England Kevin, C. Xu, California Institute of Technology Mederic Boquien, University of Massachusetts, USA Frederic Bournaud, Saclay, France Science Category: interacting/merging galaxies Observing Modes: MipsPhot Hours Approved: 2.5 Abstract: We propose to study star formation (SF) in extreme environments in order to test to breaking point the many prescriptions that have been proposed that predict under which conditions SF occurs. In particular we will investigate (i) what sets the threshold for SF and (ii) what determines, once above this threshold, the rate of SF. So far, studies dedicated to this question have been based only on data of spiral and dwarf galaxies. We argue that in order to make progress, observations are needed of SF in extreme environments, such as intergalactic SF regions. We propose to study the relation between SF and SF rate (SFR), and the neutral (atomic and molecular) gas in a sample of 13 intergalactic SF regions, spanning a wide range of luminosities. All targets have a wealth of ancillary data, mainly obtained by us such as HI, CO, Halpha, and GALEX UV. Although the latter two are indicators of unobscured SF, we know that even in intergalactic SF regions there is dust and considerable extinction. It is therefore crucial to obtain MIPS 24 um maps to determine the total SF (obscured and unobscured). A modest 2.5 hrs total time spent on 13 targets is guaranteed to deliver a substantial return on investment in the form of a much improved understanding of the sufficient and necessary conditions for SF to take place. Thursday March 25, 2010 xgal_covers.txt 195/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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