Results 1 to 10 of about 206,109 (147)
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 +5 more sources
RR Lyrae and Type II Cepheid Variables in Globular Clusters: Optical and Infrared Properties
Universe, 2022 Globular clusters are both primary fossils of galactic evolution and formation and are ideal laboratories for constraining the evolution of low-mass and metal-poor stars.
Anupam Bhardwaj
doaj +1 more source
Miras as a distance indicator in the CSST, JWST, and Gaia era
Frontiers in Astronomy and Space Sciences, 2023 Mira variables are important distance indicators owing to the clear period–luminosity relation at infrared wavelengths. We have compiled a sample of 343 Galactic Miras selected from the American Association of Variable Star Observers database and Gaia ...
Yan Sun +10 more
doaj +1 more source
Investigating the Relationship Between Urban form and Energy Consumption in Urban Settlements (Case Study: Qazvin City) [PDF]
برنامهریزی توسعه شهری و منطقهای, 2022 Due to global warming, increasing greenhouse gas emissions, and people's dependence on private cars, the need for more attention from urban experts to the impact of urban form indicators and economic and social indicators on energy consumption and ...
fateme ghorbani, Aliakbar Salaripour
doaj +1 more source
Cosmological Distance Indicators [PDF]
Space Science Reviews, 2018 Review article accepted for publication in Space Science Reviews (Springer), 45 pages, 10 figures. Chapter of a special collection resulting from the May 2016 ISSI-BJ workshop on Astronomical Distance Determination in the Space ...
Suyu, S. +3 more
openaire +5 more sources
The Astrophysical Journal, 2023 The tip of the red giant branch (TRGB) is an apparent discontinuity of the luminosity function (LF) due to the end of the red giant evolutionary phase and is used to measure distances in the local universe.
J. Wu +7 more
doaj +1 more source
The Astronomical Journal, 2023 Given the recent successful launch of the James Webb Space Telescope, determining robust calibrations of the slopes and absolute magnitudes of the near- to mid-infrared tip of the red-giant branch (TRGB) will be essential to measuring precise ...
Barry F. Madore +2 more
doaj +1 more source
Quantifying Uncertainties on the Tip of the Red Giant Branch Method
The Astronomical Journal, 2023 We present an extensive grid of numerical simulations quantifying the uncertainties in measurements of the tip of the red giant branch (TRGB). These simulations incorporate a luminosity function composed of 2 mag of red giant branch (RGB) stars leading ...
Barry F. Madore +3 more
doaj +1 more source
Drift Distance in Aircraft Glyphosate Application Using Rice Plants as Indicators [PDF]
Planta Daninha, 2020 : This study aimed to evaluate the potential for glyphosate drift during aerial application using rice plants as sentinels, aiming to determine the effect of drift on irrigated rice crops.
R.A. CÓRDOVA +5 more
doaj +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