Results 1 to 10 of about 4,651,873 (337)
Young and Intermediate-Age Distance Indicators [PDF]
Space Science Reviews, 2017 Distance measurements beyond geometrical and semi-geometrical methods, rely mainly on standard candles. As the name suggests, these objects have known luminosities by virtue of their intrinsic properties and play a major role in our understanding of ...
Smitha Subramanian +2 more
exaly +7 more sources
Extreme Quasars as Distance Indicators in Cosmology [PDF]
Frontiers in Astronomy and Space Sciences, 2020 Quasars accreting matter at very high rates (known as extreme Population A [xA] quasars, possibly associated with super-Eddington accreting massive black holes) may provide a new class of distance indicators covering cosmic epochs from present day up to ...
Deborah Dultzin +10 more
doaj +8 more sources
Cosmological Distance Indicators [PDF]
Space Science Reviews, 2018 We review three distance measurement techniques beyond the local universe: (1) gravitational lens time delays, (2) baryon acoustic oscillation (BAO), and (3) HI intensity mapping.
S. H. Suyu +3 more
semanticscholar +7 more sources
Gamma-Ray Bursts as Distance Indicators by a Statistical Learning Approach [PDF]
The Astrophysical Journal LettersGamma-ray bursts (GRBs) can be probes of the early Universe, but currently, only 26% of GRBs observed by the Neil Gehrels Swift Observatory have known redshifts ( z ) due to observational limitations.
Maria Giovanna Dainotti +8 more
doaj +2 more sources
Influence of distance from traffic sounds on physiological indicators and subjective evaluation
Transportation Research, Part D: Transport and Environment, 2020 This study examined the influence of different distances of traffic noise and sea sounds on physiological indicators and subjective evaluation. Scene re-creations employed three types of distance: actual close sounds (close to the sound source recorded ...
Zhongzhe Li, Jian Kang
exaly +2 more sources
Big Data and Cognitive Computing, 2022 Large retail companies routinely gather huge amounts of customer data, which are to be analyzed at a low granularity. To enable this analysis, several Key Performance Indicators (KPIs), acquired for each customer through different channels are associated
Andrea Ponti +4 more
doaj +3 more sources
Cepheids as Distance Indicators
Annual Review of Astronomy and Astrophysics, 1999 This review attempts to summarize the various ways of determining Cepheid reddenings and luminosities and the zero points of the Cepheid period-luminosity and period-luminosity-color relations. The methods of determining luminosities that are discussed involve Cepheid parallaxes, Cepheid proper motions and radial velocities, Cepheids in clusters and ...
M. Feast
semanticscholar +2 more sources
Publications of the Astronomical Society of the Pacific, 1986 From published photographic observations the dispersion in the maximum magnitude versus rate of decline relation for novae in M31 is σ = 0.28 mag, from which the intrinsic dispersion is found to be σ0 < 0.14 mag. This is far smaller than the 1.5 mag range in distance moduli that corresponds to 50 < H < 100 km s-1Mpc-1.
S. van den Bergh, C. Pritchet
semanticscholar +2 more sources
The Calibration of Novae as Distance Indicators
The Astrophysical Journal, 1995 The problem of the correct calibration of the maximum magnitude versus rate of decline relationship for Galactic novae is discussed, on the basis of the properties of the nova populations of M31 and the Large Magellanic Cloud (LMC). We have compared the "observed" maximum magnitude versus rate of decline (hereafter MMRD) distributions of M3 1 and LMC ...
M. Valle, M. Livio
semanticscholar +3 more sources
Optical and X-ray GRB Fundamental Planes as cosmological distance indicators [PDF]
Monthly notices of the Royal Astronomical Society, 2022 Gamma-ray bursts (GRBs), can be employed as standardized candles, extending the distance ladder beyond Type Ia supernovae (SNe Ia, z = 2.26). We standardize GRBs using the three-dimensional (3D) Fundamental Plane relation (the Dainotti relation) among ...
M. Dainotti +7 more
semanticscholar +1 more source