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Browsing MIT Open Access Articles by Title

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  • Sjouwerman, Loránt O.; Murray, Claire E.; Pihlström, Ylva M.; Fish, Vincent L.; Araya, Esteban D. (IOP Publishing, 2010-11)
    We present the first detection of a 6.7 GHz Class II methanol (CH[subscript 3]OH) maser in the Andromeda galaxy (M31). The CH[subscript 3]OH maser was found in a VLA survey during the fall of 2009. We have confirmed the ...
  • van den Berg, Maureen; Homan, Jeroen; Fridriksson, Joel K.; Linares, Manuel Alegret (Institute of Physics/American Astronomical Society, 2014-09)
    Using the High Resolution Camera on board the Chandra X-ray Observatory, we have measured an accurate position for the bright persistent neutron star X-ray binary and atoll source GX 3+1. At a location that is consistent ...
  • Bahramian, Arash; Heinke, C. O.; Sivakoff, Gregory R.; Altamirano, Diego; Wijnands, Rudy; Homan, Jeroen; Linares, Manuel Alegret; Pooley, David; Degenaar, N.; Gladstone, Jeanette C. (IOP Publishing, 2013-12)
    We report and study the outburst of a new transient X-ray binary (XRB) in Terzan 5, the third detected in this globular cluster, Swift J174805.3-244637 or Terzan 5 X-3. We find clear spectral hardening in Swift/XRT data ...
  • Venemans, B. P.; Findlay, J. R.; Sutherland, W. J.; De Rosa, G.; McMahon, R. G.; Kuijken, K.; Lewis, J. R.; Simcoe, Robert A.; Gonzalez-Solares, E. A. (IOP Publishing, 2013-11)
    Studying quasars at the highest redshifts can constrain models of galaxy and black hole formation, and it also probes the intergalactic medium in the early universe. Optical surveys have to date discovered more than 60 ...
  • Nelson, L.; Gandolfi, D.; Nowak, G.; Palle, E.; Prsa, A.; Rappaport, Saul A.; Levine, Alan M.; Sanchis Ojeda, Roberto (IOP Publishing, 2015-04)
    We report the discovery of two new low-mass, thermally bloated, hot white dwarfs among the Kepler sample of eclipsing binaries. These are KIC 9164561 and KIC 10727668 with orbital periods of 1.2670 and 2.3058 days, ...
  • Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Mainzer, A.; Marsh, Kenneth A.; Beichman, Charles A.; Burgasser, Adam J.; Prato, Lisa A.; Simcoe, Robert A.; Marley, Mark S.; Saumon, D.; Freedman, Richard S.; Eisenhardt, P. R.; Wright, Edward L. (IOP Publishing, 2011-11)
    We present the discovery of seven ultracool brown dwarfs identified with the Wide-field Infrared Survey Explorer (WISE). Near-infrared spectroscopy reveals deep absorption bands of H[subscript 2]O and CH[subscript 4] that ...
  • Welander, Paula V.; Summons, Roger Everett (National Academy of Sciences (U.S.), 2012-08)
    Hopanoids methylated at the C-3 position are a subset of bacterial triterpenoids that are readily preserved in modern and ancient sediments and in petroleum. The production of 3-methylhopanoids by extant aerobic methanotrophs ...
  • Peng, En-Hsin; Andersson, Karl; Bautz, Marshall W.; Garmire, Gordon P. (Institute of Physics/American Astronomical Society, 2009-08)
    We present a new mass estimate of a well studied gravitational lensing cluster, Abell 1689, from deep Chandra observations with a total exposure of 200 ks. Within r = 200 h[superscript –1] kpc, the X-ray mass estimate is ...
  • Abeyaratne, Rohan; Knowles, James K. (Sage Publications, 2011-05)
    Motivated by issues arising for discrete second-order conservation laws and their continuum limits (applicable, for example, to one-dimensional nonlinear spring—mass systems), here we study the corresponding issues in the ...
  • Chen, Zhe; Vijayan, Sujith; Barbieri, Riccardo; Wilson, Matthew A.; Brown, Emery N. (MIT Press, 2009-07)
    UP and DOWN states, the periodic fluctuations between increased and decreased spiking activity of a neuronal population, are a fundamental feature of cortical circuits. Understanding UP-DOWN state dynamics is important for ...
  • Saez-Rodriguez, Julio; Alexopoulos, Leonidas G.; Epperlein, Jonathan; Samaga, Regina; Lauffenburger, Douglas A.; Klamt, Steffen; Sorger, Peter K. (EMBO and Macmillan Publishers Limited, 2009-12)
    Large-scale protein signalling networks are useful for exploring complex biochemical pathways but do not reveal how pathways respond to specific stimuli. Such specificity is critical for understanding disease and designing ...
  • Bourouiba, Lydia (American Physical Society, 2008-11)
    Rotating turbulence is characterized by the nondimensional Rossby number Ro, which is a measure of the strength of the Coriolis term relative to that of the nonlinear term. For rapid rotation (Ro→0), nonlinear interactions ...
  • Demanet, Laurent; Ying, Lexing (Society for Industrial and Applied Mathematics, 2011-02)
    This paper deals with efficient numerical representation and manipulation of differential and integral operators as symbols in phase-space, i.e., functions of space $x$ and frequency $\xi$. The symbol smoothness conditions ...
  • Vamvakos, Socrates D.; Stojanovic, Vladimir Marko; Nikolic, Borivoje (Institute of Electrical and Electronics Engineers (IEEE), 2009-10)
    Timing jitter is one of the most significant phase-locked loop characteristics, with high impact on performance in a range of applications. It is, therefore, important to develop the tools necessary to study and predict ...
  • Haslinger, Robert Heinz; Brown, Emery N.; Pipa, Gordon (MIT Press, 2010-10)
    One approach for understanding the encoding of information by spike trains is to fit statistical models and then test their goodness of fit. The time-rescaling theorem provides a goodness-of-fit test consistent with the ...
  • Haslinger, Robert Heinz; Pipa, Gordon; Brown, Emery N. (MIT Press, 2010-10)
    One approach for understanding the encoding of information by spike trains is to fit statistical models and then test their goodness of fit. The time-rescaling theorem provides a goodness-of-fit test consistent with the ...
  • Singh, Anima; Liu, J.; Guttag, John V. (Institute of Electrical and Electronics Engineers (IEEE), 2011-03)
    We investigate several entropy based approaches to finding cut points for discretizing continuous ECG-based risk metrics. We describe two existing approaches, Shannon entropy and asymmetric entropy, and one new approach, ...
  • Nair, Ranjith (American Physical Society, 2011-09)
    We consider the problem of distinguishing, with minimum probability of error, two optical beam-splitter channels with unequal complex-valued reflectivities using general quantum probe states entangled over M signal and M′ ...
  • Yamaguchi, Hiroya; Badenes, Carles; Petre, Robert; Nakano, Toshio; Castro, Daniel; Enoto, Teruaki; Hiraga, Junko S.; Hughes, John P.; Maeda, Yoshitomo; Nobukawa, Masayoshi; Safi-Harb, Samar; Slane, Patrick O.; Smith, Randall K.; Uchida, Hiroyuki (IOP Publishing, 2014-04)
    Supernova remnants (SNRs) retain crucial information about both their parent explosion and circumstellar material left behind by their progenitor. However, the complexity of the interaction between supernova ejecta and ...
  • Kollar, Thomas Fleming; Tellex, Stefanie A.; Roy, Nicholas (American Association for Artificial Intelligence, 2010)
    To be useful teammates to human partners, robots must be able to follow spoken instructions given in natural language. However, determining the correct sequence of actions in response to a set of spoken instructions is a ...
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