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  1. No Access

    Article

    Extragalactic nature of G227.1 + 1.0

    Green and Gull1 have presented evidence that G227.1 + 1.0, one of the small-diameter radio sources in the Molonglo survey of Clark and Crawford2, is a Crab-like supernova remnant. If this is the case, the object ...

    Gary A. Chanan, David J. Helfand, Hyron Spinrad, Kate Ebneter in Nature (1986)

  2. No Access

    Article

    Cometary impacts, molecular clouds, and the motion of the Sun perpendicular to the galactic plane

    Raup and Sepkoski1 have presented evidence from marine fossils for a 26-Myr periodicity in the occurrence of mass extinctions. Using the same data Rampino and Stothers2 obtained a different period, 30±1 Myr, whic...

    Patrick Thaddeus, Gary A. Chanan in Nature (1985)

  3. No Access

    Article

    The peculiar X-ray and radio star AS431

    During a systematic survey of X-ray flux-limited late-type stars1,2, we have rediscovered a highly reddened emission-line star, previously listed3 as AS431, which sheds light on whether both radio and X-ray emiss...

    Jean-Pierre Caillault, Gary A. Chanan, David J. Helfand, Joseph Patterson… in Nature (1985)

  4. No Access

    Article

    A companion quasar to 3C345

    Although some quasistellar objects (QSOs) are known to be members of small groups of galaxies (see refs 1–3), there is no known case of a QSO in a rich cluster of galaxies4. Whether this has important implication...

    Bruce Margon, Gary A. Chanan, Ronald A. Downes in Nature (1981)

  5. No Access

    Article

    Thermal X-ray emission from neutron stars

    The Einstein Observatory (HEAO 2) presents the first realistic opportunity to see a neutron star by observing radiation from its surface. In this review we show that the detection of such thermal radiation or ...

    David J. Helfand, Gary A. Chanan, R. Novick in Nature (1980)