Results 11 to 20 of about 5,019,889 (353)
Surface Brightness Fluctuations as Primary and Secondary Distance Indicators
, 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.
Blakeslee, John
core +2 more sources
Possible distance indicators in gamma-ray pulsars [PDF]
Research in Astronomy and Astrophysics, 2011 Distance measurement of gamma-ray pulsars is a current challenge in pulsar studies. The Large Area Telescope (LAT) aboard the Fermi gamma-ray observatory discovered more than 70 gamma-ray pulsars including 24 new gamma-selected pulsars with almost no ...
W. Wang
semanticscholar +4 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
Semi-regular red giants as distance indicators I. The period-luminosity relations of semi-regular variables revisited [PDF]
Astronomy & Astrophysics, 2021 Context. Semi-regular variables (SRVs) are similar to Miras in brightness, and they also follow one or more period–luminosity relations (PLRs), though not necessarily the same one as Miras.
M. Trabucchi +3 more
semanticscholar +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
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
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
Improving sampling and calibration of GRBs as distance indicators [PDF]
Monthly notices of the Royal Astronomical Society, 2020 We present a sample of 74 Gamma-Ray Bursts (GRBs) from the Fermi-GBM catalogue for which we compute the distance moduli and use them to constrain effective dark energy models.
A. Montiel, J. I. Cabrera, J. Hidalgo
semanticscholar +1 more source
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