Physical Sciences and Mathematics Commons^™

A Sub-Kpc-Scale Binary Active Galactic Nucleus With Double Narrow-Line Regions, Jong-Hak Woo, Hojin Cho, Bernd Husemann, S. Komossa, Daeseong Park, Vardha N. Bennert

Physics

We present the kinematic properties of a type-2 Quasi stellar object (QSO), SDSS J132323.33−015941.9 at z ∼ 0.35, based on the analysis of Very Large Telescope integral field spectroscopy and Hubble Space Telescope (HST) imaging, which suggest that the target is a binary active galactic nucleus (AGN) with double narrow-line regions. The QSO features double-peaked emission lines ([O iii] and Hβ) which can be decomposed into two kinematic components. The flux-weighted centroids of the blue and red components are separated by ∼0.2 arcsec (0.8 kpc in projection) and coincide with the location of the two stellar cores detected …

Longitudinal Emittance Blowup In The Large Hadron Collider, P. Baudrenghien, T. Mastoridis

Physics

The Large Hadron Collider (LHC) relies on Landau damping for longitudinal stability. To avoid decreasing the stability margin at high energy, the longitudinal emittance must be continuously increased during the acceleration ramp. Longitudinal blowup provides the required emittance growth. The method was implemented through the summer of 2010. Band-limited RF phase-noise is injected in the main accelerating cavities during the whole ramp of about 11 min. Synchrotron frequencies change along the energy ramp, but the digitally created noise tracks the frequency change. The position of the noise-band, relative to the nominal synchrotron frequency, and the bandwidth of the spectrum are …

Bayesian Approach For Uncertainty Analysis Of An Urban Storm Water Model And Its Applications To A Heavily Urbanized Watershed, Misgana K. Muleta, Jonathan Mcmillan, Geremew G. Amenu, Steven J. Burian

Physics

The significance of uncertainty analysis (UA) to quantify reliability of model simulations is being recognized. Consequently, literature on parameter and predictive uncertainty assessment of water resources models has been rising. Applications dealing with urban drainage systems are, however, very limited. This study applies formal Bayesian approach for uncertainty analysis of a widely used storm water management model and illustrates the methodology using a highly urbanized watershed in the Los Angeles Basin, California. A flexible likelihood function that accommodates heteroscedasticity, non-normality, and temporal correlation of model residuals has been used for the study along with a Markov-chain Monte Carlo-based sampling scheme. …

Discovery Of An Eo-Meso-Neoarchean Terrane In The East Greenland Caledonides, Scott M. Johnston, Andrew R.C. Kylander-Clark

Physics

tThis study investigates basement gneisses from the Niggli Spids thrust sheet of the East Greenland Caledonides in an attempt to place them into the broader context of the Archean–Paleoproterozoicarchitecture of the Greenland shield. Our combined whole-rock geochemical and U–Pb zircon geochronol-ogy results from Gåseland reveal an Archean terrane defined by TTG magmatic events at 3607 Ma and3070–2980 Ma followed by metamorphism and high-K granite intrusion at 2790–2677 Ma. These results identify a relatively pristine Archean terrane with previously unknown Eoarchean rocks that holds poten-tial for future investigations into the early evolution of continental crust, and adds to a growing body …

Characterization Of Samples For Optimization Of Infrared Stray Light Coatings, Carey L. Baxter, Rebecca Salvemini, Zaheer A. Ali, Patrick Waddell, Greg Perryman, Bob Thompson

STAR Program Research Presentations

NASA’s Stratospheric Observatory for Infrared Astronomy (SOFIA) is a converted 747SP that houses a 2.5 m telescope that observes the sky through an opening in the side of the aircraft. Because it flies at altitudes up to 45,000 feet, SOFIA gets 99.99% transmission in the infrared. Multiple science instruments mount one at a time on the telescope to interpret infrared and visible light from target sources. Ball Infrared Black (BIRB) currently coats everything that the optics sees inside the telescope assembly (TA) cavity in order to eliminate noise from the glow of background sky, aircraft exhaust, and other sources. A …

Vertical Beam Size Measurements In The Spear3 Accelerator At Slac, Natalie Ann Larosa, Jeff Corbett

STAR Program Research Presentations

Synchrotron radiation is a powerful tool used in many fields of science ranging from materials characterization to structural biology. Each year thousands of scientists travel to SLAC to use high-resolution x-rays emitted from a relativistic electron beam circulating in the SPEAR3 synchrotron light source. To characterize the beam size in SPEAR3, we constructed a visible-light interferometer capable of measuring the 22um vertical beam size. The interferometer is located 17m away from the source point and consists of two vertically separated slits. Visible light emitted from the synchrotron passes through the two slits and interferes on a CCD camera to produce …

Breaking Peroxy Bonds In H20 Ice Doped With H202 To Create Positive Hole Charge Carriers., Corey C. Stockburger

STAR Program Research Presentations

Using stress-activated electric conductivity in water ice doped with hydrogen peroxide as a model for stress-activated electric conductivity of igneous and high-grade metamorphic rocks due to the presence of peroxy defects, which when broken, createpositive-hole charge carriers. Blocks of pure H2O ice and H2O2–doped H2O ices, frozen at –20°C, will be stressed with piezo electric transducers(pzt) at one end to generate stress-activated electric currents flowing down the stress gradient. Pure H2O ice should produce no current or a small insignificant amount during rapid deformation or fracture. Stressing H2O2-doped H2O ices, however, should lead to 100-1000 times higher currents. These stress-activated …

Characterization Of The Drilling Via The Vibration Augmenter Of Rotary-Drills And Sound Signal Processing Of Impacted Pipe As A Potential Water Height Assessment Tool, Nicholas Morris

STAR Program Research Presentations

The focus of the internship has been on two topics: a) Characterize the drilling performance of a novel percussive augmenter – this drill was developed by the JPL’s Advanced Technologies Group and its performance was characterized; and b) Examine the feasibility of striking a pipe as a means of assessing the water height inside the pipe. The purpose of this investigation is to examine the possibility of using a simple method of applying impacts to a pipe wall and determining the water height from the sonic characteristic differences including damping, resonance frequencies, etc. Due to multiple variables that are relevant …

Feedback Stabilization At Spear3, Daniel Kelley, Jeff Corbett

STAR Program Research Presentations

The SPEAR3 synchrotron lightsource at SLAC relies on a sophisticated radio frequency (RF) timing system to maintain current – electrons – in the storage ring. One problem SPEAR3 operators have dealt with is the thermal expansion of one of the cables supporting this RF timing system. As the cable expands and contracts with the diurnal rise and fall of the sun, the phase of the RF in the cable shifts. This shifting phase affects the timing accuracy of electron injections into the storage ring.

A common feedback control algorithm PID (Proportional Integral Derivative) has countless applications in engineering. PID feedback …

The Standard New Astronomy Cryostat For Sofia: A Design For Cryogen-Free Infrared Astronomy, Carey F. Scott, Jeffrey Van Cleve, Eric Burgh, Earl T. Daley, Ali Kashani, Zaheer Ali

STAR Program Research Presentations

Astronomy at infrared wavelengths requires optical instruments that operate at low temperatures, which is typically done using liquid cryogens such as nitrogen and helium. These cryogens are costly and limit the operational time of the science instrument. The Standard New Astronomy Cryostat for SOFIA (SNACS) will provide a design for a helium cryocooler-cooled cryostat that meets the stringent airworthiness requirements of the Stratospheric Observatory for Infrared Astronomy (SOFIA) and can be used by future instrument builders to reduce the cost and risk of their instrument design and development. The SNACS dewar will provide approximately 3.4 x 10^-1 cubic meters …

Flitecam Data Process Validation, Jesse K. Tsai, Sachindev S. Shenoy, Brent Cedric Nicklas, Zaheer Ali, William T. Reach

STAR Program Research Presentations

FLITECAM Data Processing Validation

Many of the challenges that come from working with astronomical imaging arise from the reduction of raw data into scientifically meaningful data. First Light Infrared Test CAMera (FLITECAM) is an infrared camera operating in the 1.0–5.5 μm waveband on board SOFIA (Stratospheric Observatory For Infrared Astronomy). Due to the significant noise from the atmosphere and the camera itself, astronomers have developed many methods to reduce the effects of atmospheric and instrumental emission. The FLITECAM Data Reduction Program (FDRP) is a program, developed at SOFIA Science Center, subtracts darks, removes flats, and dithers images.

This project contains …

Designing A Cold Source To Be Integrated With The Existing Telescope Assembly Alignment Simulator, Rebecca L. Salvemini, Carey Baxter, Zaheer Ali, Greg Perryman, Robert Thompson, Daniel Nolan

STAR Program Research Presentations

The stratospheric observatory for infrared astronomy (SOFIA), is a modified Boeing 747-SP with a 2.5m telescope mounted inside. SOFIA flies at an altitude of 45,000 feet, above 99% of the water vapor in the atmosphere, allowing transmission of most infrared radiation. SOFIA has seven different science instruments (SI) that can be used to collect astronomical data, enabling scientists to look at many different wavelengths of infrared and visible radiation.

The Lick Agn Monitoring Project 2011: Fe Ii Reverberation From The Outer Broad-Line Region, Aaron J. Barth, Anna Pancoast, Vardha N. Bennert, Brendon J. Brewer, Gabriela Canalizo, Alexei V. Filippenko, Elinor L. Gates, Jenny E. Greene, Weidong Li, Matthew A. Malkan, David J. Sand, Daniel Stern, Tommaso Treu, Jong-Hak Woo, Roberto J. Assef, Hyun-Jin Bae, Tabitha Buehler, S. Bradley Cenko, Kelsey I. Clubb, Michael C. Cooper, Aleksander M. Diamond-Stanic, Sebastian F. Hönig, Michael D. Joner, C. David Laney, Mariana S. Lazarova, A. M. Nierenberg, Jeffrey M. Silverman, Erik J. Tollerud, Jonelle L. Walsh

Physics

The prominent broad Fe ii emission blends in the spectra of active galactic nuclei have been shown to vary in response to continuum variations, but past attempts to measure the reverberation lag time of the optical Fe ii lines have met with only limited success. Here we report the detection of Fe ii reverberation in two Seyfert 1 galaxies, NGC 4593 and Mrk 1511, based on data from a program carried out at Lick Observatory in Spring 2011. Light curves for emission lines including Hβ and Fe ii were measured by applying a fitting routine to decompose the spectra into …

Update On Beam Induced Rf Heating In The Lhc, B. Salvant, O. Aberle, G. Arduini, R. Assmann, B. Baglin, M.J. Barnes, W. Bartmann, P. Baudrenghien, O. Berrig, C. Bracco, E. Bravin, G. Bregliozzi, R. Bruce, A. Bertarelli, F. Carra, G. Cattenoz, F. Caspers, S. Claudet, H. Day, M. Garlasche, L. Gentini, B. Goddard, A. Grudiev, B. Henrist, R. Jones, O. Kononenko, G. Lanza, L. Lari, T. Mastoridis, V. Mertens, E. Métral, N. Mounet, J.E. Muller, A.A. Nosych, J.L. Nougaret, S. Persichelli, A.M. Piguiet, S. Redaelli, F. Roncarolo, G. Rumolo, B. Salvachua, M. Sapinski, R. Schmidt, E. Shaposhnikova, L. Tavian, M. Timmins, J. Uythoven, A. Vidal, J. Wenninger, D. Wollmann, M. Zerlauth, P. Fassnacht, S. Jakobsen, M. Deile

Physics

Since June 2011 the rapid increase of the luminosity performance of the LHC has come at the expense of both increased temperature and pressure of specific, near-beam, LHC equipment. In some cases, this beam induced heating has caused delays while equipment cool-down, beam dumps and even degradation of some devices. This contribution gathers the observations of beam induced heating, attributed to longitudinal beam coupling impedance, their current level of understanding and possible actions planned to be implemented during the 1st LHC Long Shutdown (LS1) in 2013-2014.

Investigations Of The Lhc Emittance Blow-Up During The 2012 Proton Run, M. Kuhn, G. Arduini, P. Baudrenghien, J. Emery, A. Guerrero, W. Hofle, V. Kain, M. Lamont, T. Mastoridis, F. Roncarolo, M. Sapinski, M. Schaumann, R. Steinhagen, G. Trad, D. Valuch

Physics

About 30 % of the potential luminosity performance is lost through the different phases of the LHC cycle, mainly due to transverse emittance blow-up. Measuring the emittance growth is a difficult task with high intensity beams and changing energies. Improvements of the LHC transverse profile instrumentation helped to study various effects. A breakdown of the growth through the different phases of the LHC cycle is given as well as a comparison with the data from the LHC experiments for transverse beam size. In 2012 a number of possible sources and remedies have been studied. Among these are intra beam scattering, …

Search For 14.4 Kev Solar Axions From M1 Transition Of 57fe With Cuore Crystals, F. Alessandria, R Ardito, D. R. Artusa, F.T. Avignone Iii, O. Azzolini, M Balata, T.I. Banks, G. Bari, J. Beeman, F Bellini, A. Bersani, M. Biassoni, T. Bloxham, C Brofferio, C Bucci, X.Z. Cai, L. Canonica, S Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Casali, N. Chott, M Clemenza, C Cosmelli, O Cremonesi, R.J. Creswick, I Dafinei, A. Dally, V. Datskov, A. De Biasi, M.P. Decowski, M. M. Deninno, S Di Domizio, M.L. Di Vacri, L. Ejzak, R. Faccini, D.Q. Fang, H.A. Farach, E. Ferri, F Ferroni, E Fiorini, M.A. Franceschi, S.J. Freedman, B.K. Fujikawa, A Giachero, L. Gironi, A Giuliani, J. Goett, P Gorla, C. Gotti, E Guardincerri, T. D. Gutierrez, E.E. Haller, K. Han, K.M. Heeger, H.Z. Huang, R. Kadel, G. Keppel, L. Kogler, Yu. G. Kolomensky, D. Lenz, Y.L. Li, C. Ligi, X. Liu, Y.G. Ma, C. Maiano, M. Maino, M. Martinez, R.H. Maruyama, N. Moggi, S Morganti, T. Napolitano, S. Newman, S Nisi, C Nones, E.B. Norman, A Nucciotti, F. Orio, D. Orlandi, J.L. Ouellet, M Pallavicini, E. Palmieri, L. Pattavina, M Pavan, M Pedretti, G Pessina, S Pirro, E Previtali, V. Rampazzo, F. Rimondi, C Rosenfeld, C. Rusconi, S Sangiorgio, N.D. Scielzo, M Sisti, A.R. Smith, L. Taffarello, M. Tenconi, W.D. Tian, C. Tomei, S. Trentalange, G Ventura, M Vignati, B.S. Wang, H.W. Wang, C. A. Whitten Jr., T. Wise, A. Woodcraft, L Zanotti, C. Zarra, B.X. Zhu, S. Zucchelli

Physics

We report the results of a search for axions from the 14.4 keV M1 transition from ⁵⁷Fe in the core of the sun using the axio-electric effect in TeO₂bolometers. The detectors are 5

× 5 × 5 cm³ crystals operated at about 10 mK in a facility used to test bolometers for the CUORE experiment at the Laboratori Nazionali del Gran Sasso in Italy. An analysis of 43.65 kg⋅d of data was made using a newly developed low energy trigger which was optimized to reduce the energy threshold of the detector. An upper limit of 0.58 …

Validation Of Techniques To Mitigate Copper Surface Contamination In Cuore, F. Alessandria, R. Ardito, D.R. Artusa, F.T. Avignone Iii, O. Azzolini, M. Balata, T.I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, T. Bloxham, C. Brofferio, C. Bucci, X.Z. Cai, L. Canonica, S. Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Casali, N. Chott, M. Clemenza, C. Cosmelli, O. Cremonesi, R.J. Creswich, I. Dafinei, A. Dally, V. Datskov, A. De Biasi, M.M. Deninno, S. Di Domizio, M.L. Di Vacri, L. Ejzak, R. Faccini, D.Q. Fang, H.A. Farach, E. Ferri, F. Ferroni, E. Fiorini, M.A. Franceschi, S.J. Freedman, B.K. Fujikawa, A. Giachero, L. Gironi, A. Giuliani, J. Goett, A. Goodsell, P. Gorla, C. Gotti, E. Guardincerri, T.D. Gutierrez, E.E. Haller, K. Han, K.M. Heeger, H.Z. Huang, R. Kadel, K. Kazkaz, G. Keppel, L. Kogler, Yu. G. Kolomensky, D. Lenz, Y.L. Li, C. Ligi, X. Liu, Y.G. Ma, C. Maiano, M. Maino, M. Martinez, R.H. Maruyama, Y. Mei, N. Moggi, S. Morganti, T. Napolitano, S. Newman, S. Nisi, C. Nones, E.B. Norman, A. Nucciotti, F. Orio, D. Orlandi, J.L. Ouellet, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, M. Pedretti, G. Pessina, S. Pirro, E. Previtali, V. Rampazzo, R. Reil, F. Rimondi, C. Rosenfeld, C. Rusconi, S. Sangiorgio, N.D. Scielzo, M. Sisti, A.R. Smith, L. Sparks, F. Stivanello, L. Taffarello, M. Tenconi, W.D. Tian, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, B.S. Wang, H.W. Wang, C.A. Whitten Jr, T. Wise, A. Woodcraft, L. Zanotti, C. Zarra, B.X. Zhu, S. Zucchelli

Physics

In this article we describe the background challenges for the CUORE experiment posed by surface contamination of inert detector materials such as copper, and present three techniques explored to mitigate these backgrounds. Using data from a dedicated test apparatus constructed to validate and compare these techniques we demonstrate that copper surface contamination levels better than 10⁻⁷- 10⁻⁸ Bq/cm² are achieved for ²³⁸U and ²³²Th. If these levels are reproduced in the final CUORE apparatus the projected 90% C.L. upper limit on the number of background counts in the region of interest is 0.02–0.03 counts/keV/kg/y …

The Extended Narrow-Line Region Of Two Type-I Quasi-Stellar Objects, Semyeong Oh, Jong-Hak Woo, Vardha N. Bennert, Bruno Jungwiert, Martin Haas, Christian Leipski, Marcus Albrecht

Physics

We investigate the narrow-line region (NLR) of two radio-quiet QSOs, PG1012+008 and PG1307+085, using high signal-to-noise spatially resolved long-slit spectra obtained with FORS1 at the Very Large Telescope. Although the emission is dominated by the point-spread function of the nuclear source, we are able to detect extended NLR emission out to several kiloparsec scales in both QSOs by subtracting the scaled central spectrum from outer spectra. In contrast to the nuclear spectrum, which shows a prominent blue wing and a broad line profile of the [Oiii] line, the extended emission reveals no clear signs of large-scale outflows. Exploiting the wide …

The Low-Luminosity End Of The Radius-Luminosity Relationship For Active Galactic Nuclei, Misty C. Bentz, Kelly D. Denney, Catherine J. Grier, Aaron J. Barth, Bradley M. Peterson, Marianne Vestergaard, Vardha N. Bennert, Gabriela Canalizo, Gisella De Rosa, Alexei V. Filippenko, Elinor L. Gates, Jenny E. Greene, Weidong Li, Matthew A. Malkan, Richard W. Pogge, Daniel Stern, Tommaso Treu, Jong-Hak Woo

Physics

We present an updated and revised analysis of the relationship between the Hβ broad-line region (BLR) radius and the luminosity of the active galactic nucleus (AGN). Specifically, we have carried out two-dimensional surface brightness decompositions of the host galaxies of nine new AGNs imaged with the Hubble Space Telescope Wide Field Camera 3. The surface brightness decompositions allow us to create “AGN-free” images of the galaxies, from which we measure the starlight contribution to the optical luminosity measured through the ground-based spectroscopic aperture. We also incorporate 20 new reverberation-mapping measurements of the Hβ time lag, which is assumed to yield …

Computational Problems In Introductory Physics: Lessons From A Bead On A Wire, Thomas J. Bensky, Matthew J. Moelter

Physics

We have found that incorporating computer programming into introductory physics requires problems suited for numerical treatment while still maintaining ties with the analytical themes in a typical introductory-level university physics course. In this paper, we discuss a numerical adaptation of a system commonly encountered in the introductory physics curriculum: the dynamics of an object constrained to move along a curved path. A numerical analysis of this problem that includes a computer animation can provide many insights and pedagogical avenues not possible with the usual analytical treatment. We present two approaches for computing the instantaneous kinematic variables of an object constrained …

The Low Energy Spectrum Of Teo2 Bolometers: Results And Dark Matter Perspectives For The Cuore-0 And Cuore Experiments, F. Alessandria, R. Ardito, D.R. Artusa, F.T. Avignone Iii, O. Azzolini, M. Balata, T.I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, T. Bloxham, C. Brofferio, C. Bucci, X.Z. Cai, L. Canonica, S. Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Casali, N. Chott, M. Clemenza, C. Cosmelli, O. Cremonesi, R.J. Creswick, I. Dafinei, A. Dally, V. Datskov, A. De Biasi, M.P. Decowski, M.M. Deninno, S. Di Domizio, M.L. Di Vacri, L. Ejzak, R. Faccini, D.Q. Fang, H.A. Farach, E. Ferri, F. Ferroni, E. Fiorini, M.A. Franceschi, S.J. Freedman, B.K. Fujikawa, A. Giachero, L. Gironi, A. Guiliani, J. Goett, P. Gorla, C. Gotti, E. Guardincerri, T.D. Gutierrez, E.E. Haller, K. Han, K.M. Heeger, H.Z. Huang, R. Kadel, K. Kazkaz, G. Keppel, L. Kogler, Yu. G. Kolomensky, D. Lenz, Y.L. Li, C. Ligi, X. Liu, Y.G. Ma, C. Maino, M. Maino, M. Martinez, R.H. Maruyama, N. Moggi, S. Morganti, T. Napolitano, S. Newman, S. Nisi, C. Nones, E.B. Norman, A. Nucciotti, F. Orio, D. Orlandi, J.L. Ouellet, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, M. Pedretti, G. Pessina, S. Pirro, E. Previtali, V. Rampazzo, F. Rimondi, C. Rosenfeld, C. Rusconi, S. Sangiorgio, N.D. Scielzo, M. Sisti, A.R. Smith, F. Stivanello, L. Taffarello, M. Tenconi, W.D. Tian, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, B.S. Wang, H.W. Wang, C.A. Whitten Jr., T. Wise, A. Woodcraft, L. Zanotti, C. Zarra, B.X. Zhu, S. Zucchelli

Physics

We collected 19.4 days of data from four 750 g TeO2 bolometers, and in three of them we were able to set the energy threshold around 3 keV using a new analysis technique. We found a background rate ranging from 25 cpd/keV/kg at 3 keV to 2 cpd/keV/kg at 25 keV, and a peak at 4.7 keV. The origin of this peak is presently unknown, but its presence is confirmed by a reanalysis of 62.7 kg·days of data from the finished CUORICINO experiment. Finally, we report the expected sensitivities of the CUORE-0 (52 bolometers) and CUORE (988 bolometers) experiments to …

The Properties Of Post-Starburst Quasars Based On Optical Spectroscopy, Sabrina L. Cales, Michael S. Brotherton, Zhaohui Shang, Jessie C. Runnoe, Michael A. Dipompeo, Vardha Nicola Bennert, Gabriela Canalizo, Kyle D. Hiner, R. Stoll, Rajib Ganguly, Aleksandar Diamond-Stanic

Physics

We present optical spectroscopy of a sample of 38 post-starburst quasars (PSQs) at z ~ 0.3, 29 of which have morphological classifications based on Hubble Space Telescope imaging. These broad-lined active galactic nuclei (AGNs) possess the spectral signatures of massive intermediate-aged stellar populations, making them potentially useful for studying connections between nuclear activity and host galaxy evolution. We model the spectra in order to determine the ages and masses of the host stellar populations, and the black hole masses and Eddington fractions of the AGNs. Our model components include an instantaneous starburst, a power law, and emission lines. We find …