Now showing items 1-20 of 29

    • A COMPACT TWO-STEP LASER TIME-OF-FLIGHT MASS SPECTROMETER FOR IN SITU ANALYSIS OF PLANETARY SURFACES 

      Getty, Stephanie A.; Brinckerhoff, William B.; Cornish, Timothy J.; Grubisic, Andrej; Li, Xiang; Uckert, Kyle (2015-09-16)
    • On the Nature of the High-Energy Rollover in 1H 0419-577 

      Turner, T, J.; Reeves, J. N.; Braito, V,; Costa, M. (Oxford Academic, 2018)
      A NuSTAR/Swift observation of the luminous Seyfert 1 galaxy 1H 0419-577 taken during 2015 reveals one of the most extreme high energy cut-offs observed to date from an AGN - an origin due to thermal Comptonization would ...
    • Delayed Shock-induced Dust Formation in the Dense Circumstellar Shell Surrounding the Type IIn Supernova SN 2010jl 

      Sarangi, Arkaprabha; Dwek, Eli; Arendt, Richard G. (IOP Science, 2018)
      The light curves of Type IIn supernovae are dominated by the radiative energy released through the interaction of the supernova shock waves with their dense circumstellar medium (CSM). The ultraluminous Type IIn supernova ...
    • Thirty‐year trends in acid deposition and neutralization in two headwater catchments, northwestern Massachusetts, USA 

      Dethier, David P.; Wieman, Scott T.; Racela, Jason (Wiley, 2018-09-04)
      Long-term decreases in acidic precursors have changed the chemistry of precipitation and streamflow in two moderately to well-buffered, forested headwater catchments in the Taconic Range of western New England, USA. We ...
    • Resolving the X-ray obscuration in a low flux observation of the quasar PDS 456 

      Reeves, James; Braito, Valentina; Nardini, Emanuele; Hamann, Fred; Chartas, George; Lobban, Andrew; O'Brien, Paul; Turner, Jane (2018-09-19)
      Simultaneous XMM-Newton, NuSTAR and HST observations, performed in March 2017, of the nearby (z=0.184 ) luminous quasar PDS 456 are presented. PDS 456 had a low X-ray flux compared to past observations, where the first of ...
    • A deep X-ray view of the bare AGN Ark 120 VI. Geometry of the hot corona from spectroscopic and polarization signatures 

      Marinucci, A.; Porquet, D.; Tamborra, F.; Bianchi, S.; Braito, V.; Lobban, A.; Marin, F.; Matt, G.; Middei, R.; Nardini, E.; Reeves, J.; Tortosa, A. (ESO, 2018-11-30)
      Context. The spectral shape of the hard X-ray continuum of active galactic nuclei (AGN) can be ascribed to inverse Compton scattering of optical/UV seed photons from the accretion disc by a hot corona of electrons. This ...
    • NuSTAR Detection of X-rays Concurrent with Gamma Rays in the Nova V5855 Sgr 

      Nelson, Thomas; Mukai, Koji; Li, Kwan-Lok; Vurm, Indrek; Metzger, Brian D.; Chomiuk, Laura; Sokoloski, J.L.; Linford, Justin D.; Bohlsen, Terry; Luckas, Paul (2018-12-31)
      We report the first detection of hard (>10 keV) X-ray emission simultaneous with gamma rays in a nova eruption. Observations of the nova V5855 Sgr carried out with the NuSTAR satellite on Day 12 of the eruption revealed ...
    • Tests of General Relativity and Fundamental Physics with Space-based Gravitational Wave Detectors 

      Berti, Emanuele; Barausse, Enrico; Cholis, Ilias; Garcia-Bellido, Juan; Holley-Bockelmann, Kelly; Hughes, Scott A.; Kelly, Bernard; Kovetz, Ely D.; Littenberg, Tyson B.; Livas, Jeffrey; Mueller, Guido; Natarajan, Priya; Shoemaker, David H.; Shoemaker, Deirdre; Schnittman, Jeremy D.; Vallisneri, Michele; Yunes, Nicolas (2019-03-07)
      Low-frequency gravitational-wave astronomy can perform precision tests of general relativity and probe fundamental physics in a regime previously inaccessible. A space-based detector will be a formidable tool to explore ...
    • Kiloparsec-scale Jets: Physics, Emission Mechanisms, and Challenges 

      Perlman, Eric S.; Meyer, Eileen; Eilek, Jean; Tchekhovskoy, Sasha; Nyland, Kristina; Agudo, Ivan; Baum, Stefi; Hardcastle, Martin; Kadler, Matthias; Labiano, Alvaro; Marshall, Herman; O’Dea, Christopher; Worrall, Diana (2019-03-08)
      Jets are a ubiquitous part of the accretion process, created in AGN, by a coupling between the magnetic field near the central black hole and inflowing material. We point out what advances can be achieved by new technologies, ...
    • What is the nature and origin of the highest-energy particles in the universe 

      Sarazin, Fred; Anchordoqui, Luis; Beatty, James; Bergman, Douglas; Covault, Corbin; Farrar, Glennys; Krizmanic, John; Nitz, David; Olinto, Angela; Unger, Michael; Tinyakov, Peter; Wiencke, Lawrence (2019-03-10)
      This white paper was submitted to the US Astronomy and Astrophysics Decadal Survey (Astro2020) and defines the science questions to be answered in the next decade in the field of Ultra-High Energy Cosmic-Rays. Following a ...
    • High-Energy Polarimetry - a new window to probe extreme physics in AGN jets 

      Rani, B.; Zhang, H.; Hunter, S. D.; Kislat, F.; Böttcher, M.; McEnery, J. E.; Thompson, D. J.; Giannios, D.; Guo, F.; Li, H.; Baring, M.; Agudo, I.; Buson, S.; Petropoulou, M.; Pavlidou, V.; Angelakis, E.; Myserlis, I.; Wadiasingh, Z.; Silva, R. M. Curado da; Kilian, P.; Guiriec, S.; Bozhilov, V. V.; Hodgson, J.; Antón, S.; Kazanas, D.; Coppi, P.; Venters, T.; Longo, F.; Bottacini, E.; Ojha, R.; Zhang, B.; Ciprini, S.; Moiseev, A.; Shrader, C. (2019-03-11)
      The constantly improving sensitivity of ground-based and space-borne observatories has made possible the detection of high-energy emission (X-rays and gamma-rays) from several thousands of extragalactic sources. Enormous ...
    • Energetic Particles of Cosmic Accelerators II: Active Galactic Nuclei and Gamma-ray Bursts 

      Venters, Tonia M.; Guiriec, Sylvain; Lien, Amy Y.; Ajello, Marco; Brandt, Terri J.; Blumer, Harsha; Briggs, Michael; Coppi, Paolo; D'Ammando, Filippo; Fields, Brian; Finke, Justin; Fryer, Chris; Hamaguchi, Kenji; Harding, J. Patrick; Hewitt, John W.; Humensky, Brian; Hunter, Stanley D.; Li, Hui; Longo, Francesco; McEnery, Julie; Ojha, Roopesh; Pavlidou, Vasiliki; Petropoulou, Maria; Prescod-Weinstein, Chanda; Rani, Bindu; Santander, Marcos; Tomsick, John A.; Wadiasingh, Zorawar; Walter, Roland (2019-03-11)
      The high-energy universe has revealed that energetic particles are ubiquitous in the cosmos and play a vital role in the cultivation of cosmic environments on all scales. Though they play a key role in cultivating the ...
    • Energetic Particles of Cosmic Accelerators I: Galactic Accelerators 

      Venters, Tonia M.; Hamaguchi, Kenji; Brandt, Terri J.; Ajello, Marco; Blumer, Harsha; Briggs, Michael; Coppi, Paolo; D'Ammando, Filippo; Becker, Michaël De; Fields, Brian; Guiriec, Sylvain; Hewitt, John W.; Humensky, Brian; Hunter, Stanley D.; Li, Hui; Lien, Amy Y.; Longo, Francesco; Marcowith, Alexandre; McEnery, Julie; Ojha, Roopesh; Pavlidou, Vasiliki; Prescod-Weinstein, Chanda; Santander, Marcos; Tomsick, John A.; Wadiasingh, Zorawar; Walter, Roland (2019-03-11)
      The high-energy universe has revealed that energetic particles are ubiquitous in the cosmos and play a vital role in the cultivation of cosmic environments on all scales. Energetic particles in our own galaxy, galactic ...
    • Multi-Physics of AGN Jets in the Multi-Messenger Era 

      Rani, B.; Petropoulou, M.; Zhang, H.; D'Ammando, F.; Finke, J.; Baring, M.; Böttcher, M.; Dimitrakoudis, S.; Gan, Z.; Giannios, D.; Hartmann, D. H.; Krichbaum, T. P.; Marscher, A. P.; Mastichiadis, A.; Nalewajko, K.; Ojha, R.; Paneque, D.; Shrader, C.; Sironi, L.; Tchekhovskoy, A.; Thompson, D. J.; Vlahakis, N.; Venters, T. M. (2019-03-11)
      Active galactic nuclei (AGN) with relativistic jets, powered by gas accretion onto their central supermassive black hole (SMBH), are unique laboratories for studying the physics of matter and elementary particles in extreme ...
    • Neutrinos, Cosmic Rays and the MeV Band 

      Ojha, R.; Zhang, H.; Kadler, M.; Neilson, N. K.; Kreter, M.; McEnery, J.; Buson, S.; Caputo, R.; Coppi, P.; D'Ammando, F.; Angelis, A. De; Fang, K.; Giannios, D.; Guiriec, S.; Guo, F.; Kopp, J.; Krauss, F.; Li, H.; Meyer, M.; Moiseev, A.; Petropoulou, M.; Prescod-Weinstein, C.; Rani, B.; Shrader, C.; Venters, T.; Wadiasingh, Z. (2019-03-13)
      The possible association of the blazar TXS 0506+056 with a high-energy neutrino detected by IceCube holds the tantalizing potential to answer three astrophysical questions: 1. Where do high-energy neutrinos originate? 2. ...
    • Supermassive black holes at high redshifts 

      Paliya, Vaidehi S.; Ajello, Marco; Marcotulli, Lea; Tomsick, John; Perkins, Jeremy S.; Prandini, Elisa; D'Ammando, Filippo; Angelis, Alessandro De; Thompson, David; Li, Hui; Dominguez, Alberto; Beckmann, Volker; Guiriec, Sylvain; Wadiasingh, Zorawar; Coppi, Paolo; Harding, J. Patrick; Petropoulou, Maria; Hewitt, John W.; Ojha, Roopesh; Marcowith, Alexandre; Doro, Michele; Castro, Daniel; Baring, Matthew; Hays, Elizabeth; Orlando, Elena; Guiriec, Sylvain; Bozhilov, Vladimir; Agudo, Ivan; Venters, Tonia; McEnery, Julie; The, Lih-Sin; Hartmann, Dieter; Buson, Sara; Longo, Francesco; Gasparrini, Dario (2019-03-14)
      MeV blazars are the most luminous persistent sources in the Universe and emit most of their energy in the MeV band. These objects display very large jet powers and accretion luminosities and are known to host black holes ...
    • Observing the transient pulsations of SMC X-1 with NuSTAR 

      Pike, Sean N.; Harrison, Fiona A.; Bachetti, Matteo; Brumback, McKinley C.; Fürst, Felix S.; Madsen, Kristin K.; Pottschmidt, Katja; Tomsick, John A.; Wilms, Jörn (2019-03-15)
      We report on NuSTAR observations of transient pulsations in the neutron star X-ray binary SMC X-1. The transition from non-pulsing to pulsing states was not accompanied by a large change in flux. Instead, both pulsing and ...
    • A Shocking Shift in Paradigm for Classical Novae 

      Chomiuk, Laura; Aydi, Elias; Babul, Aliya-Nur; Derdzinski, Andrea; Kawash, Adam; Li, Kwan-Lok; Linford, Justin; Metzger, Brian D.; Mukai, Koji; Rupen, Michael P.; Sokoloski, Jennifer; Sokolovsky, Kirill; Steinberg, Elad (2019-03-19)
      The discovery of GeV gamma-rays from classical novae has led to a reassessment of these garden-variety explosions, and highlighted their importance for understanding radiative shocks, particle acceleration, and dust formation ...
    • A Shocking Shift in Paradigm for Classical Novae 

      Chomiuk, Laura; Aydi, Elias; Babul, Aliya-Nur; Derdzinski, Andrea; Kawash, Adam; Li, Kwan-Lok; Linford, Justin; Metzger, Brian D.; Mukai, Koji; Rupen, Michael P.; Sokoloski, Jennifer; Sokolovsky, Kirill; Steinberg, Elad (2019-03-19)
      The discovery of GeV gamma-rays from classical novae has led to a reassessment of these garden-variety explosions, and highlighted their importance for understanding radiative shocks, particle acceleration, and dust formation ...