Results 51 to 60 of about 390,667 (199)

Does the obscured AGN fraction really depend on luminosity? [PDF]

, 2015
We use a sample of 151 local non-blazar AGN selected from the INTEGRAL all-sky hard X-ray survey to investigate if the observed declining trend of the fraction of obscured (i.e.
Churazov, Eugene, Krivonos, Roman, Sazonov, Sergey   +2 more
core   +2 more sources

Colorimetría del Fruto de Café (Coffea arabica L.) Durante su Desarrollo y Maduración Coffee Fruit (Coffea arabica L.) Colorimetry During its Development and Maturation

Revista Facultad Nacional de Agronomía Medellín, 2011
Obtener estándares del color del fruto de café durante su desarrollo y maduración es necesario para diferentes procesos relacionados con la cosecha y poscosecha de este producto.
José Jaime Carvajal Herrera, Iván Darío Aristizábal Torres, Carlos Eugenio Oliveros Tascón, Jhon Wilson Mejía Montoya   +3 more
doaj  

Dust-driven winds of AGB stars: The critical interplay of atmospheric shocks and luminosity variations

, 2016
Winds of AGB stars are thought to be driven by a combination of pulsation-induced shock waves and radiation pressure on dust. In dynamic atmosphere and wind models, the stellar pulsation is often simulated by prescribing a simple sinusoidal variation in ...
Eriksson, K., Höfner, S., Liljegren, S., Nowotny, W.   +3 more
core   +1 more source

Luminosity indicators in dusty photoionized environments [PDF]

, 1998
The luminosity of the central source in ionizing radiation is an essential parameter in a photoionized environment, and one of the most fundamental physical quantities one can measure.
Dejan  Vinković, Ekaterina  Verner, Emmanuel  Momjian, Engelbracht C. W., Gary  Ferland, Hummer D., Joseph  LaMothe, Mark  Bottorff, Oliveira S. A., Storey P. J., van de Steene G. C.   +10 more
core   +2 more sources

A reddening-free method to estimate the $^{56}$Ni mass of Type Ia supernovae

, 2016
The increase in the number of Type Ia supernovae (SNe\,Ia) has demonstrated that the population shows larger diversity than has been assumed in the past. The reasons (e.g. parent population, explosion mechanism) for this diversity remain largely unknown.
Blondin, S., Dhawan, S., Leibundgut, B., Spyromilio, J.   +3 more
core   +3 more sources

Isotropic Luminosity Indicators in a Complete AGN Sample

, 2009
The [O IV] 25.89 micron line has been shown to be an accurate indicator of active galactic nucleus (AGN) intrinsic luminosity in that it correlates well with hard (10-200 keV) X-ray emission. We present measurements of [O IV] for 89 Seyfert galaxies from
Aleksandar M. Diamond-Stanic, Antonucci, Armus, Bassani, Bransford, Cannon, Chiaberge, Condon, Dale, de Grijp, Done, Dong, Evans, Feldmeier, Freedman, Fricke, George H. Rieke, Ghosh, Gilli, Grandi, Ho, Ho, Ho, Houck, Iyomoto, Jane R. Rigby, Jones, Kaspi, Kewley, La Franca, Laor, Lavalley, Lawrence, Levenson, Levenson, Levenson, Levenson, Maiolino, Meléndez, Meléndez, Miller, Moran, Mould, Nemmen, Netzer, Nicastro, Oliva, Reynolds, Rigby, Rigby, Risaliti, Sadler, Salvati, Sandage, Sandqvist, Satyapal, Schaerer, Schmitt, Shapley, Slee, Spoon, Steffen, Terashima, Terashima, Tran, Treister, Turner, Turner, Ueda, Veron-Cetty, Vila, Werner, White, Winkler, Yang, Yang, Yaqoob, Yaqoob, Young   +78 more
core   +1 more source

Luminosity–Luminosity Correlations in Flux-limited Multiwavelength Data [PDF]

The Astrophysical Journal, 2019
Abstract We explore the general question of correlations among different waveband luminosities in a flux-limited multiband observational data set. Such correlations, often observed for astronomical sources, may be either intrinsic or induced by the redshift evolution of the luminosities and the data truncation due to the flux limits.
J. Singal, V. Petrosian, J. Haider, S. Malik   +3 more
openaire   +1 more source

Abiotic factors drives floristic variations of fern’s metacommunity in an Atlantic Forest remnant

Brazilian Journal of Biology, 2018
We analyzed floristic variations in fern’s metacommunity at the local scale and their relationship with abiotic factors in an Atlantic Forest remnant of northeastern Brazil.
L. E. N. Costa, R. P. Farias, A. C. P. Santiago, I. A. A. Silva, I. C. L. Barros   +4 more
doaj   +1 more source

Blue Stragglers in Low-Luminosity Star Clusters

, 2005
We examine the blue straggler populations of 13 low-luminosity (M_V_t >~ -6) globular clusters and 2 old open clusters. These clusters test blue straggler formation in environments intermediate between higher luminosity (and usually higher density ...
Eric L. Sandquist, Ferraro F. R.
core   +2 more sources

Luminosity function of GRBs [PDF]

Astronomy & Astrophysics, 2001
We attempt to constrain the luminosity function of Gamma Ray Bursts (GRBs) from the observed number count--flux relation and the afterglow redshift data. We assume three classes of luminosity functions for our analysis: (a) Log-normal distribution, (b) Schechter distribution, and (c) Scale-free distribution. We assume several models of the evolution of
Sethi, Shiv, Bhargavi, S. G.
openaire   +2 more sources