Gravitational wave backgrounds and the cosmic transition from Population III to Population II stars     

Stefania Marassi  Raffaella Schneider  Valeria Ferrari 《Monthly notices of the Royal Astronomical Society》2009,398(1):293-302

  相似文献   

The 2dF–SDSS LRG and QSO survey: the QSO luminosity function at 0.4 < z < 2.6     

Scott M. Croom  Gordon T. Richards  Tom Shanks  Brian J. Boyle  Michael A. Strauss  Adam D. Myers  Robert C. Nichol  Kevin A. Pimbblet  Nicholas P. Ross  Donald P. Schneider  Robert G. Sharp  David A. Wake 《Monthly notices of the Royal Astronomical Society》2009,399(4):1755-1772

  相似文献   

Super earth explorer: a coronagraphic off-axis space telescope     

J. Schneider  A. Boccaletti  D. Mawet  P. Baudoz  J.-L. Beuzit  R. Doyon  M. Marley  D. Stam  G. Tinetti  W. Traub  J. Trauger  A. Aylward  J. Y-K. Cho  C.-U. Keller  S. Udry 《Experimental Astronomy》2009,23(1):357-377

The Super-Earth Explorer is an Off-Axis Space Telescope (SEE-COAST) designed for high contrast imaging. Its scientific objective is to make the physico-chemical characterization of exoplanets possibly down to 2 Earth radii. For that purpose it will analyze the spectral and polarimetric properties of the parent starlight reflected by the planets, in the wavelength range 400–1,250 nm.  相似文献   

Detectable signatures of cosmic radiative feedback     

R. Schneider  R. Salvaterra  T. Roy Choudhury  A. Ferrara  C. Burigana  L. A. Popa 《Monthly notices of the Royal Astronomical Society》2008,384(4):1525-1532

  相似文献   

Reconstructing deep‐time histories from integrated thermochronology: An example from southern Baffin Island,Canada     

Kalin T. McDannell  David A. Schneider  Peter K. Zeitler  Paul B. O'Sullivan  Dale R. Issler 《地学学报》2019,31(3):189-204

We present a multi‐chronometric approach for reconstructing deep‐time thermal histories using southern Baffin Island as a case study. This continuous thermal history begins with the Palaeoproterozoic Trans‐Hudson Orogeny and is derived from inverse and forward models that integrate thermochronometers spanning some 500°C: new apatite U–Pb ages and K‐feldspar ⁴⁰Ar/³⁹Ar multi‐diffusion domain data, published (U–Th)/He zircon ages and new multi‐kinetic fission‐track results. Integration of data from a wider temperature range reduces ambiguities in thermal‐history modelling and permits us to constrain the timing of geological processes including, extended post‐orogenic cooling, enhanced later Proterozoic cooling, and then episodic burial and exhumation in the Palaeozoic–Mesozoic.  相似文献   

Comparing the Validity and Reliability of Place Attachment Across Cultures     

Christopher J. Wynveen  Ingrid E. Schneider  Stuart Cottrell  Arne Arnberger  Alexander C. Schlueter  Eick Von Ruschkowski 《社会与自然资源》2017,30(11):1389-1403

Researchers often measure human–place bonds via place attachment scales across a variety of settings. However, scale use does not always include an evaluation of the scales’ psychometric properties, especially in multisite studies. Failure to consider a place attachment scale’s measurement properties makes both validity and reliability assumptions and may lead to improper data interpretation. Hence, this investigation assessed a place attachment scale across three sites via data collected on site in natural resource protected areas in Colorado, Minnesota, and Germany. A series of confirmatory factor analyses assessed the hypothesized two-dimensional (i.e., place identity and place dependence) model, Cronbach’s alphas calculated a measure of internal consistency, and a multigroup procedure cross-validated the scale. Some items did not load on the hypothesized dimension and the pattern of factor loadings was not equivalent across settings, suggesting assessment of place attachment scales may be necessary when used in new contexts.  相似文献   

Microcrater populations on Apollo 17 rocks     

E. Schneider  F. Hörz 《Icarus》1974,22(4):459-473

Approximately 6000 microcrates were investigated using binocular microscope techniques on Apollo 17 rocks 70215, 72215, 72235, 72395, 72435, 73216, 73218, 73275, 74275, 76135, 76136 and 79155. The crater populations observed have identical characteristics to those obtained from previous missions.Special emphasis was placed on assessing the influence of target properties on the observable crater populations. Although these properties cannot be quantitatively evaluated at present, the empirical results indicate that crater populations on glass, breccia, and crystalline rock surfaces may differ fundamentally. As a consequence, lunar surface exposure ages of individual rocks based on micrometeoroid craters may be subject to criticism.  相似文献   

Cosmic-ray positrons: are there primary sources?     

Stphane Coutu  Steven W. Barwick  James J. Beatty  Amit Bhattacharyya  Chuck R. Bower  Christopher J. Chaput  Georgia A. de Nolfo  Michael A. DuVernois  Allan Labrador  Shawn P. McKee  Dietrich Müller  James A. Musser  Scott L. Nutter  Eric Schneider  Simon P. Swordy  Gregory Tarl  Andrew D. Tomasch  Eric Torbet 《Astroparticle Physics》1999,11(4):208-435

Galactic cosmic rays consist of primary and secondary particles. Primary cosmic rays are thought to be energized by first order Fermi acceleration processes at supernova shock fronts within our Galaxy. The cosmic rays that eventually reach the Earth from this source are mainly protons and atomic nuclei, but also include electrons. Secondary cosmic rays are created in collisions of primary particles with the diffuse interstellar gas. They are relatively rare but carry important information on the Galactic propagation of the primary particles. The secondary component includes a small fraction of antimatter particles, positrons and antiprotons. In addition, positrons and antiprotons may also come from unusual sources and possibly provide insight into new physics. For instance, the annihilation of heavy supersymmetric dark matter particles within the Galactic halo could lead to positrons or antiprotons with distinctive energy signatures. With the High-Energy Antimatter Telescope (HEAT) balloon-borne instrument, we have measured the abundances of positrons and electrons at energies between 1 and 50 GeV. The data suggest that indeed a small additional antimatter component may be present that cannot be explained by a purely secondary production mechanism. Here we describe the signature of the effect and discuss its possible origin.  相似文献   

A simultaneous maximum likelihood approach for galaxy--galaxy lensing and cluster lens reconstruction     

Bernhard Geiger  Peter Schneider 《Monthly notices of the Royal Astronomical Society》1999,302(1):118-130

  相似文献   

Gravitational wave background from a cosmological population of core-collapse supernovae     

Valeria Ferrari  Sabino Matarrese  Raffaella Schneider 《Monthly notices of the Royal Astronomical Society》1999,303(2):247-257

  相似文献