Results 121 to 130 of about 18,989 (273)
Long‐term impacts of primary school scholarships: Evidence from Cambodia
Journal of Policy Analysis and Management, Volume 43, Issue 1, Page 10-38, Winter 2024.ABSTRACT This randomized trial investigates the long‐term effects of a primary school scholarship program in rural Cambodia. We estimate impacts—9 years after program inception—on educational attainment, cognitive skills, socio‐emotional outcomes, labor market outcomes, and well‐being.
Felipe Barrera‐Osorio +2 more
wiley +1 more source
Multi-TeV Flaring from High-energy Blazars: An Evidence of the Photohadronic Process [PDF]
Astrophysical Journal, 2019 High-energy peaked blazars are known to undergo episodes of flaring in GeV–TeV gamma-rays involving different timescales. This flaring mechanism is not well understood, despite long-term simultaneous multiwavelength observations.
S. Sahu +2 more
semanticscholar +1 more source
The space density ofz > 4 blazars [PDF]
Monthly notices of the Royal Astronomical Society, 2019 High redshift blazars are an important class of Active Galactic Nuclei (AGN) that can provide an independent estimate of the supermassive black-hole mass function in high redshift radio-loud AGN without the bias due to absorption along the line-of-sight.
A. Caccianiga +11 more
semanticscholar +1 more source
Publications of the Astronomical Society of Japan, 2002 Based on the beaming model, a relation between the observed polarization and the Doppler factor was obtained by Fan et al. (1997, AAA068.159.190), who showed that the polarization is associated with the Doppler factor (boosting factor) in BL Lacertae objects (BLs).
Jun-Hui Fan, Jun-Hui Fan
openaire +2 more sources
Optical Variability of TeV Blazars on long time-scales [PDF]
Monthly notices of the Royal Astronomical Society, 2019 We present the results of photometric observations of three TeV blazars, 3C 66A, S5 0954+658 and BL Lacertae, during the period 2013--2017. Our extensive observations were performed in a total of 360 nights which produced $\sim$6820 image frames in BVRI ...
H. Gaur +14 more
semanticscholar +1 more source
Fermi-LAT Stacking Analysis Technique: An Application to Extreme Blazars and Prospects for their CTA Detection [PDF]
Astrophysical Journal, 2019 We present a likelihood profile stacking technique based on the Fermi-Large Area Telescope (LAT) data to explore the γ-ray characteristics of Fermi-LAT undetected astrophysical populations.
V. Paliya +4 more
semanticscholar +1 more source
Radiation processes in blazars [PDF]
AIP Conference Proceedings, 1997 We present an overview of the current theoretical models attempting to describe the structure and radiative processes operating in blazars and discuss the observational constraints that these models must confront.
openaire +3 more sources
Asca Observations of Blazars [PDF]
Highlights of Astronomy, 1998 During the last years it has become evident that blazar class of AGN emit a lot of energy in the gamma-ray regime. It is generally thought that the non-thermal emission from blazars, observed from radio to GeV/TeV 7-rays, is radiation of very energetic particles via both synchrotron and Compton processes.
Greg Madejski +2 more
openaire +2 more sources
Sharp Polarimetric Eyes: More Trees than Forest?
Galaxies, 2016 The Fermi Gamma-ray Space Telescope (Fermi) has focused the intensive multi-wavelength and international observational effort on blazars since it was launched in 2008. Part of this effort involves systematic monitoring of the highly variable polarization
Paul S. Smith
doaj +1 more source
Extreme blazars as counterparts of IceCube astrophysical neutrinos [PDF]
, 2016 We explore the correlation of $\gamma$-ray emitting blazars with IceCube neutrinos by using three very recently completed, and independently built, catalogues and the latest neutrino lists.
P. Padovani +6 more
semanticscholar +1 more source