Results 41 to 50 of about 224,275 (141)
The Effect of Superpositions on the Planetary Nebula Luminosity Function
The Astrophysical Journal, 2023 Planetary nebula (PN) surveys in systems beyond ∼10 Mpc often find high-excitation, point-like sources with [O iii ] λ 5007 fluxes greater than the apparent bright-end cutoff of the planetary nebula luminosity function (PNLF).
Owen Chase +3 more
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New model for calculation the radius of comet’s nucleus [PDF]
E3S Web of ConferencesIn this work, a new equation derived to obtain some physical properties like radius and luminosity of comets using distances between the comet, the Earth and the Sun that represent the geocentric distance and heliocentric distance at applying it to a ...
Mohammed Abd-AL Hamza Mariam +1 more
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General Physical Properties of Fermi Blazars
The Astrophysical Journal Supplement Series, 2023 We study the general physical properties of Fermi blazars using the Fermi fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazars are fitted by using the one-zone leptonic model to obtain some physical ...
Yongyun Chen +8 more
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ВЛИЯНИЕ ГРАВИТАЦИОННОГО ЛИНЗИРОВАНИЯ НА ФУНКЦИЮ СВЕТИМОСТИ КВАЗАРОВ
Odessa Astronomical Publications, 2011 The function of quasar distribution on apparent brightness is discussed. This function is found on base of suggestion that quasars, at least partly, are strong gravitational lensing images of the active nuclei of distant galaxies.
Ю. Л. Бухмастова
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General Physical Properties of Gamma-Ray-emitting Radio Galaxies
The Astrophysical Journal Supplement Series, 2023 We study the radio galaxies with known redshifts detected by the Fermi satellite after 10 yr of data (4FGL-DR2). We use a one-zone leptonic model to fit the quasi-simultaneous multiwavelength data of these radio galaxies and study the distributions of ...
Yongyun Chen +6 more
doaj +1 more source
Luminosities of Carbon-rich Asymptotic Giant Branch stars in the Milky Way [PDF]
, 2013 Stars evolving along the Asymptotic Giant Branch can become Carbon-rich in the final part of their evolution. They replenish the inter-stellar medium with nuclear processed material via strong radiative stellar winds.
Cristallo, Sergio, Guandalini, Roald
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The Planetary Nebula Luminosity Function in the Era of Precision Cosmology
Frontiers in Astronomy and Space Sciences, 2022 One of the great surprises of the late 1980s was the discovery that the [O III] λ5007 planetary nebula luminosity function (PNLF) could be used as a precision extragalactic standard candle.
Robin Ciardullo, Robin Ciardullo
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The white dwarf luminosity function. I. Statistical errors and alternatives [PDF]
, 2006 Over the years, several methods have been proposed to compute galaxy luminosity functions, from the most simple ones -counting sample objects inside a given volume- to very sophisticated ones -like the C- method, the STY method or the Choloniewski method,
Abazajian +59 more
core +3 more sources
The Astrophysical Journal, 2022 The calibration of the tip of the red giant branch (TRGB) in the I band has a direct role in determinations of the Hubble constant, a subject of recent interest due to the discrepancy between direct and indirect estimates of its value.
Siyang Li +2 more
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Estimating galaxy luminosity functions. [PDF]
The Astronomical Journal, 1997 29 pages, uses AASTeX 4.0 macros. Includes 6 tables and 8 Postscript figures.
openaire +4 more sources