Results 31 to 40 of about 7,395,903 (283)
SALT2: using distant supernovae to improve the use of type Ia supernovae as distance indicators [PDF]
, 2007 We present an empirical model of Type Ia supernovae spectro-photometric evolution with time. The model is built using a large data set including light-curves and spectra of both nearby and distant supernovae, the latter being observed by the SNLS ...
J. Guy +24 more
semanticscholar +1 more source
ASTROPHYSICAL TESTS OF MODIFIED GRAVITY: CONSTRAINTS FROM DISTANCE INDICATORS IN THE NEARBY UNIVERSE [PDF]
, 2012 We use distance measurements in the nearby universe to carry out new tests of gravity, surpassing other astrophysical tests by over two orders of magnitude for chameleon theories. The three nearby distance indicators—cepheids, tip of the red giant branch
B. Jain, V. Vikram, Jeremy Sakstein
semanticscholar +1 more source
Local Distance Indicators [PDF]
Symposium - International Astronomical Union, 2005 A summary is given of the calibration of the Cepheid scale required in the derivation of distances from observations at V and I, as in the HST work on extragalactic Cepheids. There is some evidence that a small metallicity correction may be necessary in deriving distances in this way.
openaire +2 more sources
The Astronomical Journal, 2023 The accuracy of stellar distances inferred purely from parallaxes degrades rapidly with distance. Proper motion measurements, when combined with some idea of typical velocities, provide independent information on stellar distances.
C. A. L. Bailer-Jones
doaj +1 more source
Travel Matrix Decomposition for Understanding Spatial Long-Distance Travel Structure
Complexity, 2023 Mobile phone location data enable us to obtain accurate and temporally detailed long-distance travel distribution. However, the traditional long-distance travel distribution model cannot normally handle this detailed temporal information.
Hiromichi Yamaguchi +2 more
doaj +1 more source
Surface brightness fluctuations as primary and secondary distance indicators [PDF]
, 2012 The surface brightness fluctuations (SBF) method measures the variance in a galaxy’s light distribution arising from fluctuations in the numbers and luminosities of individual stars per resolution element.
J. Blakeslee
semanticscholar +1 more source
Open Praxis, 2023 Due to the forces of globalization, higher education institutions have increased their participation in international partnerships and the flow of academic services and resources across borders.
Rebecca E. Heiser
doaj +1 more source
The extragalactic distance scale. V - Tertiary distance indicators
The Astrophysical Journal, 1979 G. D. de Vaucouleurs
semanticscholar +2 more sources
EVALUATION INDICATORS IN DISTANCE EDUCATION AT THE UNIVERSITY SYSTEM
RIED: Revista Iberoamericana de Educación a Distancia, 2001 The key- question the article propose is if it is possible to stablish a unique quality indicators system for all the universities. We realize there is no a consensus about which are the objectives at the University level.
Javier Callejo +4 more
doaj +1 more source
The Local Distance Network: A community consensus report on the measurement of the Hubble constant at ∼1% precision [PDF]
Astronomy & AstrophysicsThe direct empirical determination of the local value of the Hubble constant (̋cst) has markedly advanced thanks to improved instrumentation, measurement techniques, and distance estimators.
S. Casertano +36 more
semanticscholar +1 more source