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Ball State Faculty, Student, and Staff Research: Recent submissions

  • Accelerated particles from shocks formed in merging clusters of galaxies 
    Berrington, Robert C.; Dermer, Charles D.; Sturner, S.J. (2001)
    Subcluster interactions within clusters of galaxies produce shocks that accelerate nonthermal particles. We treat Fermi acceleration of nonthermal electrons and protons by injecting power-law distributions of particles ...
  • Computer Simulations of Nonthermal Particles in Clusters of Galaxies: Application to the Coma Cluster 
    Berrington, Robert C.; Dermer, Charles D. (2004)
    We have developed a numerical model for the temporal evolution of particle and photon spectra resulting from nonthermal processes at the shock fronts formed in merging clusters of galaxies. Fermi acceleration is approximated ...
  • Gamma Ray Emission from Merger Shocks in the Coma Cluster of Galaxies 
    Berrington, Robert C.; Dermer, Charles D. (2004)
    A numerical simulation model of the injection and cooling of nonthermal particles energized by shocks formed in merging clusters of galaxies is used to fit radio and X-ray data observed from the Coma cluster of galaxies. ...
  • Global Kinematics of the Globular Cluster M15* 
    Drukier, G.A.; Slavin, S.D.; Cohn, H.N.; Lugger, P.M.; Berrington, Robert C.; Murphy, B.W.; Seitzer, P.O. (1998-02)
    We present velocities for 230 stars in the outer parts of the globular cluster M15 measured with the Hydra multifiber spectrograph on the 3.5 m WIYN telescope. A new Bayesian technique is used for analyzing the data. The ...
  • Evidence for Stellar Streaming in the Cores of Elliptical Galaxies: A Kinematic Signature of Mergers? 
    Pierce, Michael J.; Berrington, Robert C. (2000-02-22)
    We present evidence for non-Gaussian velocity fields within the cores of luminous elliptical galaxies. This evidence is based on high signal-to-noise ratio, medium-resolution spectroscopy of the cores of early-type members ...
  • The Dynamics of the Merging Galaxy Cluster System A2256: Evidence for a New Subcluster 
    Berrington, Robert C.; Lugger, Phyllis M.; Cohn, Haldan N. (2002-05)
    We present 236 new radial velocities of galaxies in the cluster A2256 measured with the WIYN Hydra Multi-Object Spectrograph. Combined with the previous work of Fabricant, Kent, & Kurtz, we have velocities for a total of ...
  • Nonthermal Particles and Radiation Produced by Cluster Merger Shocks 
    Berrington, Robert C.; Dermer, Charles D. (2003-09-10)
    We have developed a numerical model for the temporal evolution of particle and photon spectra resulting from nonthermal processes at the shock fronts formed in merging clusters of galaxies. Fermi acceleration is approximated ...
  • The Global Kinematics of the Globular Cluster M92 
    Drukier, G.A.; Cohn, H.N.; Lugger, P.M.; Slavin, S.D.; Berrington, Robert C.; Murphy, B.W. (2007-02-07)
    We report the determination of high-accuracy radial velocities for 306 members of the globular cluster M92 using the Hydra multiobject spectrograph on the WIYN telescope. We have concentrated on stars outside of the central ...
  • A V801 Cygni Update 
    Berrington, Robert C. (1991)
    From newly collected data at the Maria Mitchell Observatory, a new ephemeris of V801 Cygni is derived.
  • The Cyclic Period Variability in SW Cygni 
    Berrington, Robert C.; Hall, Douglas S. (1994-05)
    Timings of primary eclipse up through 1992 are collected, plus a few overlooked in earlier studies. Analysis show that, after decreasing until approximately equals 1919 and increasing since then, the period has now started ...
  • The dynamical evolution of poor clusters of galaxies: Growth and properties of the first-ranked galaxy 
    Bode, Paul W.; Berrington, Robert C.; Cohn, Haldan N.; Lugger, Phyllis M. (1994-10)
    We report N-body simulations of the dynamical evolution of isolated clusters of 50 galaxies containing a dark matter component that comprises 90% of the cluster mass. For our adopted physical scaling, the line-of- sight ...
  • A Radial Velocity Survey of the Cyg OB2 Association 
    Kiminki, Daniel C.; Kobulnicky, Henry A.; Kinemuchi, K.; Irwin, Jennifer S.; Fryer, Christopher L.; Berrington, Robert C.; Uzpen, B.; Monson, Andy J.; Pierce, Michael J.; Woosley, S.E. (2006-09-27)
    We conducted a radial velocity survey of the Cyg OB2 association over a 6 yr (1999-2005) time interval to search for massive close binaries. During this time we obtained 1139 spectra on 146 OB stars to measure mean systemic ...
  • The Remote Observatories of the Southeastern Association for Research in Astronomy (SARA) 
    Keel, William C.; Oswalt, Terry; Mack, Peter; Henson, Gary; Hillwig, Todd; Batcheldor, Daniel; Berrington, Robert C.; De Pree, Chris; Hartmann, Dieter; Leake, Martha; Licandro, Javier; Murphy, Brian; Webb, James; Wood, Matt A. (2016-11-30)
    We describe the remote facilities operated by the Southeastern Association for Research in Astronomy (SARA) , a consortium of colleges and universities in the US partnered with Lowell Observatory, the Chilean National ...
  • The X-ray spectrum and spectral energy distribution of FIRST J155633.8+351758: a LoBAL quasar with a probable polar outflow 
    Berrington, Robert C.; Brotherton, Michael S.; Gallagher, Sarah C.; Ganguly, Rajib; Shang, Zhaohouli; DiPompeo, Michael; Chatterjee, Ritaban; Lacy, Mark; Gregg, Michael D.; Hall, Patrick B.; Laurent-Muehleisen, S.A. (2013-10-23)
    We report the results of a new 60 ks Chandra X-ray Observatory Advanced CCD Imaging Spectrometer S-array (ACIS-S) observation of the reddened, radio-selected, highly polarized ‘FeLoBAL’ quasar FIRST J1556+3517. We investigated ...
  • Online Discussion Boards: A Framework for Improving the Quality of Participation 
    Orozco, Luis Eduardo (2019)
    Online classes allow the convenience of learners to connect and retrieve information at any time. One of the most important activities from online classes is the interaction among students using an online discussion ...
  • Dynamic Terrorist Strategy: A Case Study of ISIS in Syria and Boko Haram in Nigeria 
    Ajibola, Olayinka (2019)
    Over the years, terrorist organizations have established various networks across the world and have inspired new ideas causing a rise in terrorist activities. This research examines the comparison of terrorist groups in ...
  • Sales and Operation Integration: The Role of Collaboration and Alignment 
    Rangarajan, Deva; Boute, Robert; Weijters, Bert; Paesbrugghe, Bert (2015)
    In this paper we focus on the collaboration and alignment between the Sales and Operations teams in organizations. Although the potential benefits of collaboration and alignment between sales and operations are significant, ...
  • What Keeps Sales Managers Up at Night 
    Rangarajan, Deva (2016)
    Demanding customers, stiff competition, focus of companies on short term gains has meant that the sales manager today is under tremendous pressure to cope with these problems or run the risk of seeing declining revenues, ...
  • Emerging Leadership Through Coloring: Stories of the Indiana Women of Achievement 
    Glowacki-Dudka, Michelle (2018-08)
  • How Big Data Can Transform Outcomes and Opportunities 
    Gelb, Betsy D.; Rangarajan, Deva; Hallikainen, Heli; Laukkanen, Tommi (2019)
    The increasing use of “big data” -- large, multi-dimensional and quickly changing datasets -- prompted this research, depth interviews that explore how big data affect organizations or even society at large. Examples ...

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