Physics

Migmatite Gneiss Of The Jættedal Complex, Liverpool Land, East Greenland: Protracted High-T Metamorphism In The Overriding Plate Of The Caledonian Orogen, S. M. Johnston, A. Kylander-Clark, H. K. Brueckner

The Greenland Caledonides (GC) formed in the overriding Laurentian plate during the closure of the Iapetus Ocean and the subduction of Baltica, and offer a unique opportunity to study metamorphic patterns, regional structures and the kinematic evolution of the overriding plate of a continental collision. We present new metamorphic petrology and coupled zircon geochronology and geochemistry data from the Jættedal complex in southern Liverpool Land to document the thermal evolution of the orogenic core of the southern GC. Pelitic migmatite gneisses from the Jættedal complex document metamorphic conditions of 850–730 °C at pressures of 11–9.5 kbar. Zircon from these samples …

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The Muse View Of Qso Pg 1307+085: An Elliptical Galaxy On The MBh–Σ* Relation Interacting With Its Group Environment, Bernd Husemann, Vardha Nicola Bennert, Julia Scharwächter, J.-H. Woo, O. S. Choundhury

Physics

We report deep optical integral-field spectroscopy with the Multi-Unit Spectroscopic Explorer (MUSE) at the Very Large Telescope of the luminous radio-quiet quasi-stellar object (QSO) PG 1307+085 obtained during commissioning. Given the high sensitivity and spatial resolution delivered by MUSE, we are able to resolve the compact (r_e ∼ 1.3 arcsec) elliptical host galaxy. After spectroscopic deblending of the QSO and host galaxy emission, we infer a stellar velocity dispersion of σ_* = 155 ± 19 km s⁻¹. This places PG 1307+085 on the local M_BH–σ_* relation within its intrinsic scatter but offset …

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A Local Baseline Of The Black Hole Mass Scaling Relations For Active Galaxies. Iii. The Mbh-Σ Relation, Vardha Nicola Bennert, Tommaso Treu, Matthew W. Auger, Maren Cosens, Daeseong Park, Rebecca Rosen, Chelsea E. Harris, Matthew A. Malkan, Jong-Hak Woo

Physics

We create a baseline of the black hole (BH) mass ()—stellar-velocity dispersion (σ) relation for active galaxies, using a sample of 66 local () Seyfert-1 galaxies, selected from the Sloan Digital Sky Survey (SDSS). Analysis of SDSS images yields AGN luminosities free of host-galaxy contamination, and morphological classification. 51/66 galaxies have spiral morphology. Out of these, 28 bulges have Sérsic index and are considered candidate pseudo-bulges, with eight being definite pseudo-bulges based on multiple classification criteria met. Only 4/66 galaxies show signs of interaction/merging. High signal-to-noise ratio Keck spectra provide the width of the broad Hβ emission …

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Yielding And Microstructure In A 2d Jammed Material Under Shear Deformation, Nathan C, Keim, Paulo E. Arratia

Physics

The question of how a disordered material's microstructure translates into macroscopic mechanical response is central to understanding and designing materials like pastes, foams and metallic glasses. Here, we examine a 2D soft jammed material under cyclic shear, imaging the structure of ∼5 × 10⁴ particles. Below a certain strain amplitude, the structure becomes conserved at long times, while above, it continually rearranges. We identify the boundary between these regimes as a yield strain, defined without rheological measurement. Its value is consistent with a simultaneous but independent measurement of yielding by stress-controlled bulk rheometry. While there are virtually no irreversible …

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Transient Reflectance Of Photoexcited Cd3As2, Christopher P. Weber, Ernest Arushanov, Bryan S. Berggren, Tahereh Hosseini, Nikolai Kouklin, Alex Nateprov

Physics

We report ultrafast transient-grating measurements of crystals of the three-dimensional Dirac semimetal cadmium arsenide, Cd₃As₂, at both room temperature and 80 K. After photoexcitation with 1.5-eV photons, charge-carriers relax by two processes, one of duration 500 fs and the other of duration 3.1 ps. By measuring the complex phase of the change in reflectance, we determine that the faster signal corresponds to a decrease in absorption, and the slower signal to a decrease in the light's phase velocity, at the probe energy. We attribute these signals to electrons' filling of phase space, first near the photon …

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Hst Imaging Of Fading Agn Candidates. I. Host-Galaxy Properties And Origin Of The Extended Gas*, William Keel, W. Peter Maksym, Vardha Nicola Bennert, Chris J. Lintott, S. Drew Chojnowski, Alexei Moiseev, Aleksandrina Smirnova, Kevin Schawinski, C. Megan Urry, Daniel A. Evans

Physics

We present narrow- and medium-band Hubble Space Telescope imaging, with additional supporting ground-based imaging, spectrophotometry, and Fabry–Perot interferometric data, for eight galaxies identified as hosting a fading active galactic nucleus (AGN). These are selected to have AGN-ionized gas projected kpc from the nucleus and energy budgets with a significant shortfall of ionizing radiation between the requirement to ionize the distant gas and the AGN as observed directly, indicating fading of the AGN on ≈50,000 yr timescales. This paper focuses on the host-galaxy properties and origin of the gas. In every galaxy, we identify evidence of ongoing or past interactions, including …

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The Lick Agn Monitoring Project 2011: Spectroscopic Campaign And Emission-Line Light Curves, Aaron J. Barth, Vardha N. Bennert, Gabriela Canalizo, Alexei V. Filippenko, Elinor L. Gates, Jenny E. Greene, Weidong Li, Matthew A. Malkan, Anna Pancoast, David J. Sand, Daniel Stern, Tommaso Treu, Jong-Hak Woo, Roberto J. Assef, Hyun-Jin Bae, Brendon J. Brewer, S. Bradley Cenko, Kelsey I. Clubb, Michael C. Cooper, Aleksandar M. Diamond-Stanic, Kyle D. Hiner, Sebastian F. Honig, Eric Hsiao, Michael T. Kandrashoff, Mariana S. Lazarova, A.M. Nierenberg, Jacob Rex, Jeffrey M. Silverman, Erik J. Tollerud, Jonelle L. Walsh

Physics

In the Spring of 2011 we carried out a 2.5 month reverberation mapping campaign using the 3 m Shane telescope at Lick Observatory, monitoring 15 low-redshift Seyfert 1 galaxies. This paper describes the observations, reductions and measurements, and data products from the spectroscopic campaign. The reduced spectra were fitted with a multicomponent model in order to isolate the contributions of various continuum and emission-line components. We present light curves of broad emission lines and the active galactic nucleus (AGN) continuum, and measurements of the broad Hβ line widths in mean and rms spectra. For the most highly variable AGNs we …

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Neutrinoless Double-Beta Decay Search With Cuore And Cuore-0 Experiments, N. Moggi, D.R. Artusa, F. T. Avignone Iii, O. Azzolini, M Balata, T.I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, C. Brofferio, C. Bucci, X. Z. Cai, A. Camacho, A. Caminata, L. Canonica, X.G. Cao, S Capelli, L. Capelli, L. Carbone, L. Cardani, N. Casali, L. Cassina, D. Chiesa, N. Chott, M Clemenza, S. Copello, C. Cosmelli, O. Cremonesi, R.J. Creswick, J.S. Cushman, I. Dafinei, A. Dally, V. Datskov, S. Dell'oro, M. M. Deninno, S Di Domizio, M.L. Di Vacri, A. Drobizhev, L. Ejzak, D.Q. Fang, H.A. Farach, M. Faverzani, G. Fernandes, E. Ferri, F. Ferroni, E. Fiorini, M.A. Franceschi, S.J. Freedman, B.K. Fujikawa, A. Giachero, L. Gironi, A. Giuliani, P. Gorla, C. Gotti, Thomas D. Gutierrez, E.E. Haller, K. Han, K.M. Heeger, R. Hennings-Yeomans, K.P. Hickerson, H. Z. Huang, R. Kadel, G. Keppel, Yu. G. Kolomensky, Y. L. Li, C. Ligi, K.E. Lim, X Liu, Y. G. Ma, C. Maiano, M. Maino, M. Martinez, R.H. Maruyama, Y. Mei, S. Morganti, T. Napolitano, S. Nisi, C. Nones, E.B. Norman, A. Nucciotti, T. O'Donnell, F. Orio, D. Orlandi, J.L. Ouellet, C.E. Pagliarone, M Pallavicini, M. Pallavicini, V. Palmieri, L. Pattavina, M Pavan, G Pessina, V. Pettinacci, G. Piperno, C. Pira, S Pirro, S. Pozzi, E Previtali, C. Rosenfeld, C. Rusconi, E. Sala, S Sangiorgio, D. Santone, N.D. Scielzo, M Sisti, A. R. Smith, L. Taffarello, M. Tenconi, F. Terranova, W.D. Tian, C. Tomei, S. Trentalange, G. Ventura, M Vignati, B. S. Wang, H. W. Wang, L. Wielgus, J. Wilson, L.A. Winslow, T. Wise, A. Woodcraft, L Zanotti, C. Zarra, G. Q. Zhang, B. X. Zhu, S. Zucchelli

Physics

The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for the neutrinoless double-beta decays. Observation of the process would unambiguously establish that neutrinos are Majorana particles and provide information on their absolute mass scale hierarchy. CUORE is now under construction and will consist of an array of 988 TeO₂ crystal bolometers operated at 10 mK, but the first tower (CUORE-0) is already taking data. The experimental techniques used will be presented as well as the preliminary CUORE-0 results. The current status of the full-mass experiment and its expected sensitivity will then be discussed.

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Cosmic Evolution Of Black Holes And Spheroids. V. The Relation Between Black Hole Mass And Host Galaxy Luminosity For A Sample Of 79 Active Galaxies, Daeseong Park, Jong-Hak Woo, Vardha N. Bennert, Tommaso Treu, Matthew W. Auger, Matthew A. Malkan

Physics

We investigate the cosmic evolution of the black hole (BH) mass–bulge luminosity relation using a sample of 52 active galaxies at z ∼ 0.36 and z ∼ 0.57 in the BH mass range of 107.4–109.1 M0. By consistently applying multicomponent spectral and structural decomposition to high-quality Keck spectra and high-resolution Hubble Space Telescope images, BH masses (MBH) are estimated using the Hβ broad emission line combined with the 5100 Å nuclear luminosity, and bulge luminosities (Lbul ) are derived from surface photometry. Comparing the resulting MBH − Lbul relation to local active galaxies and taking into account selection effects, we …

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Role Of Disorder In Finite-Amplitude Shear Of A 2d Jammed Material, Nathan C. Keim, Paulo E. Arratia

Physics

A material’s response to small but finite deformations can reveal the roots of its response to much larger deformations. Here, we identify commonalities in the responses of 2D soft jammed solids with different amounts of disorder. We cyclically shear the materials while tracking their constituent particles, in experiments that feature a stable population of repeated structural relaxations. Using bidisperse particle sizes creates a more amorphous material, while monodisperse sizes yield a more polycrystalline one. We find that the materials’ responses are very similar, both at the macroscopic, mechanical level and in the microscopic motions of individual particles. However, both locally …

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Searching For Neutrinoless Double-Beta Decay Of 130te With Cuore, D.R. Artusa, F.T. Avignone Iii, O. Azzolini, M. Balata, T.I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, C. Brofferio, C. Bucci, X.Z. Cai, A. Camacho, L. Canonica, X.G. Cao, S. Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Casali, D. Chiesa, N. Chott, M. Clemenza, S. Copello, C. Cosmelli, O. Cremonesi, R.J. Creswick, I. Dafinei, A. Dally, V. Datskov, A. De Biasi, M.M. Deninno, S. Di Domizio, M.L. Di Vacri, L. Ejzak, D.Q Fang, H.A. Farach, M. Faverzani, G. Fernandes, 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, T.D. Gutierrez, E.E. Haller, K. Han, K.M. Heeger, R. Hennings-Yeomans, H.Z. Huang, R. Kadel, K. Kazkaz, G. Keppel, Yu. G. Kolomensky, 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. Nisi, C. Nones, E.B. Norman, A. Nucciotti, T. O'Donnell, F. Orio, D. Orlandi, J.L. Ouellet, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, M. Pedretti, G. Pessina, V. Pettinacci, G. Piperno, C. Pira, S. Pirro, E. Previtali, V. Rampazzo, C. Rosenfeld, C. Rusconi, E. Sala, S. Sangiorgio, N.D. Scielzo, M. Sisti, A.R. Smith, L. Taffarello, M. Tenconi, F. Terranova, W.D. Tian, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, B.S. Wang, H.W. Wang, L. Wielgus, J. Wilson, L.A. Winslow, T. Wise, A. Woodcraft, L. Zanotti, C. Zarra, B.X. Zhu, S. Zucchelli

Physics

Neutrinoless double-beta (0νββ) decay is a hypothesized lepton-number-violating process that offers the only known means of asserting the possible Majorana nature of neutrino mass. The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for 0νββ decay of 130Te using an array of 988 TeO2 crystal bolometers operated at 10 mK. The detector will contain 206 kg of 130Te and have an average energy resolution of 5 keV; the projected 0νββ decay half-life sensitivity after five years of livetime is 1.6 × 1026 y at 1σ (9.5 × 1025 y at the 90% confidence level), …

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Radar Absorption, Basal Reflection, Thickness And Polarization Measurements From The Ross Ice Shelf, Antarctica, Jordan C. Hanson, Steven W. Barwick, Eric C. Berg, Dave Z. Besson, Thorin J. Duffin, Spencer R. Klein, Stuart A. Kleinfelder, Corey Reed, Mahshid Roumi, Thorsten Stezelberger, Joulien Tatar, James A. Walker, Liang Zou

Physics

Radio-glaciological parameters from the Moore’s Bay region of the Ross Ice Shelf, Antarctica, have been measured. The thickness of the ice shelf in Moore’s Bay was measured from reflection times of radio-frequency pulses propagating vertically through the shelf and reflecting from the ocean, and is found to be 576 ± 8 m. Introducing a baseline of 543 ± 7m between radio transmitter and receiver allowed the computation of the basal reflection coefficient, R, separately from englacial loss. The depth-averaged attenuation length of the ice column, 〈L〉 is shown to depend linearly on frequency. The best fit (95% confidence level) is …

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Confocal Sputtering Of Conformal Α-Β Phase W Films On Etched Al Features, John Mark Kreikebaum, Blas Cabrera, Jeffrey J. Yen, Paul L. Brink, Matt Cherry, Astrid Tomada, Betty A. Young

Physics

The authors report on thin-film processing improvements in the fabrication of superconducting quasiparticle-trap-assisted electrothermal-feedback transition-edge sensors used in the design of cryogenic dark matter search detectors. The work was performed as part of a detector upgrade project that included optimization of a new confocal sputtering system and development of etch recipes compatible with patterning 40 nm-thick, α-β mixed-phase W films deposited on 300–600 nm-thick, patterned Al. The authors found that their standard exothermic Al wet etch recipes provided inadequate W/Al interfaces and led to poor device performance. The authors developed a modified Al wet-etch recipe that effectively mitigates geometrical step-coverage …

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Full-Text Articles in Physics

Migmatite Gneiss Of The Jættedal Complex, Liverpool Land, East Greenland: Protracted High-T Metamorphism In The Overriding Plate Of The Caledonian Orogen, S. M. Johnston, A. Kylander-Clark, H. K. Brueckner

Physics

The Muse View Of Qso Pg 1307+085: An Elliptical Galaxy On The MBh–Σ* Relation Interacting With Its Group Environment, Bernd Husemann, Vardha Nicola Bennert, Julia Scharwächter, J.-H. Woo, O. S. Choundhury

Physics

A Local Baseline Of The Black Hole Mass Scaling Relations For Active Galaxies. Iii. The Mbh-Σ Relation, Vardha Nicola Bennert, Tommaso Treu, Matthew W. Auger, Maren Cosens, Daeseong Park, Rebecca Rosen, Chelsea E. Harris, Matthew A. Malkan, Jong-Hak Woo

Physics

Yielding And Microstructure In A 2d Jammed Material Under Shear Deformation, Nathan C, Keim, Paulo E. Arratia

Physics

Transient Reflectance Of Photoexcited Cd3As2, Christopher P. Weber, Ernest Arushanov, Bryan S. Berggren, Tahereh Hosseini, Nikolai Kouklin, Alex Nateprov

Physics

Hst Imaging Of Fading Agn Candidates. I. Host-Galaxy Properties And Origin Of The Extended Gas*, William Keel, W. Peter Maksym, Vardha Nicola Bennert, Chris J. Lintott, S. Drew Chojnowski, Alexei Moiseev, Aleksandrina Smirnova, Kevin Schawinski, C. Megan Urry, Daniel A. Evans

Physics

Physics

Physics

Cosmic Evolution Of Black Holes And Spheroids. V. The Relation Between Black Hole Mass And Host Galaxy Luminosity For A Sample Of 79 Active Galaxies, Daeseong Park, Jong-Hak Woo, Vardha N. Bennert, Tommaso Treu, Matthew W. Auger, Matthew A. Malkan

Physics

Role Of Disorder In Finite-Amplitude Shear Of A 2d Jammed Material, Nathan C. Keim, Paulo E. Arratia

Physics

Physics

Physics

Confocal Sputtering Of Conformal Α-Β Phase W Films On Etched Al Features, John Mark Kreikebaum, Blas Cabrera, Jeffrey J. Yen, Paul L. Brink, Matt Cherry, Astrid Tomada, Betty A. Young

Physics