Now showing items 1-7 of 7

    • Average Spectra of Massive Galaxies in the Sloan Digital Sky Survey 

      Eisenstein, Daniel James; Hogg, David W.; Fukugita, Masataka; Nakamura, Osamu; Bernardi, Mariangela; Finkbeiner, Douglas; Schlegel, David J.; Brinkmann, J.; Connolly, Andrew J.; Csabai, Istvan; Gunn, James E.; Ivezi?, ?eljko; Lamb, Don Q.; Loveday, Jon; Munn, Jeffrey A.; Nichol, Robert C.; Schneider, Donald P.; Strauss, Michael A.; Szalay, Alex; York, Don G. (IOP Publishing, 2003)
      We combine Sloan Digital Sky Survey spectra of 22,000 luminous, red, bulge-dominated galaxies to get high signal-to-noise ratio average spectra in the rest-frame optical and ultraviolet (2600-7000 Å). The average spectra ...
    • The DEEP2 Galaxy Redshift Survey: First Results on Galaxy Groups 

      Gerke, Brian F.; Newman, Jeffrey A.; Davis, Marc; Marinoni, Christian; Yan, Renbin; Coil, Alison L.; Conroy, Charlie; Cooper, Michael C.; Faber, S. M.; Finkbeiner, Douglas; Guhathakurta, Puragra; Kaiser, Nick; Koo, David C.; Phillips, Andrew C.; Weiner, Benjamin J.; Willmer, Christopher N. A. (IOP Publishing, 2005)
      We use the first 25% of the DEEP2 Galaxy Redshift Survey spectroscopic data to identify groups and clusters of galaxies in redshift space. The data set contains 8370 galaxies with confirmed redshifts in the range 0.7 ≤ z ...
    • Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. I. Compression-Driven Instabilities and the Electron Heating Mechanism 

      Sironi, Lorenzo; Narayan, Ramesh (IOP Publishing, 2015)
      In systems accreting well below the Eddington rate, such as the central black hole in the Milky Way (Sgr A∗), the plasma in the innermost regions of the disk is believed to be collisionless and have two temperatures, with ...
    • Galaxy Clustering in Early Sloan Digital Sky Survey Redshift Data 

      Zehavi, Idit; Blanton, Michael R.; Frieman, Joshua A.; Weinberg, David H.; Mo, Houjun J.; Strauss, Michael A.; Anderson, Scott F.; Annis, James; Bahcall, Neta A.; Bernardi, Mariangela; Briggs, John W.; Brinkmann, Jon; Burles, Scott; Carey, Larry; Castander, Francisco J.; Connolly, Andrew J.; Csabai, Istvan; Dalcanton, Julianne J.; Dodelson, Scott; Doi, Mamoru; Eisenstein, Daniel James; Evans, Michael L.; Finkbeiner, Douglas; Friedman, Scott; Fukugita, Masataka; Gunn, James E.; Hennessy, Greg S.; Hindsley, Robert B.; Ivezic, Zeljko; Kent, Stephen; Knapp, Gillian R.; Kron, Richard; Kunszt, Peter; Lamb, Donald Q.; Leger, R. French; Long, Daniel C.; Loveday, Jon; Lupton, Robert H.; McKay, Timothy; Meiksin, Avery; Merrelli, Aronne; Munn, Jeffrey A.; Narayanan, Vijay; Newcomb, Matt; Nichol, Robert C.; Owen, Russell; Peoples, John; Pope, Adrian; Rockosi, Constance M.; Schlegel, David; Schneider, Donald P.; Scoccimarro, Roman; Sheth, Ravi K.; Siegmund, Walter; Smee, Stephen; Snir, Yehuda; Stebbins, Albert; Stoughton, Christopher; SubbaRao, Mark; Szalay, Alexander S.; Szapudi, Istvan; Tegmark, Max; Tucker, Douglas L.; Uomoto, Alan; Vanden Berk, Dan; Vogeley, Michael S.; Waddell, Patrick; Yanny, Brian; York, Donald G.; undefined, undefined (IOP Publishing, 2002)
      We present the first measurements of clustering in the Sloan Digital Sky Survey (SDSS) galaxy redshift survey. Our sample consists of 29,300 galaxies with redshifts 5700 km s-1 ≤ cz ≤ 39,000 km s-1, distributed in several ...
    • Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. I. Particle Energy Spectra and Acceleration Mechanism 

      Guo, Xinyi; Sironi, Lorenzo; Narayan, Ramesh (IOP Publishing, 2014)
      Electron acceleration to non-thermal energies in low Mach number (Ms 5) shocks is revealed by radio and X-ray observations of galaxy clusters and solar flares, but the electron acceleration mechanism remains poorly ...
    • Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. Ii. Firehose-Mediated Fermi Acceleration and Its Dependence on Pre-Shock Conditions 

      Guo, Xinyi; Sironi, Lorenzo; Narayan, Ramesh (IOP Publishing, 2014)
      Electron acceleration to non-thermal energies is known to occur in low Mach number (Ms 5) shocks in galaxy clusters and solar flares, but the electron acceleration mechanism remains poorly understood. Using two-dimensional ...
    • Optical confirmation and redshift estimation of the Planck cluster candidates overlapping the Pan-STARRS Survey 

      Liu, J.; Hennig, C.; Desai, S.; Hoyle, B.; Koppenhoefer, J.; Mohr, J. J.; Paech, K.; Burgett, W. S.; Chambers, K. C.; Cole, S.; Draper, P. W.; Kaiser, N.; Metcalfe, N.; Morgan, J. S.; Price, P. A.; Stubbs, Christopher William; Tonry, J. L.; Wainscoat, R. J.; Waters, C. (Oxford University Press (OUP), 2015)
      We report results of a study of Planck Sunyaev–Zel'dovich effect selected galaxy cluster candidates using the Panoramic Survey Telescope & Rapid Response System (Pan-STARRS) imaging data. We first examine 150 Planck-confirmed ...