Results 101 to 110 of about 24,339 (257)

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, Andreas de Barros, Deon Filmer   +2 more
wiley   +1 more source

Towards discrimination between galactic and intergalactic axion-photon mixing

, 2016
There exists a growing evidence for the anomalous transparency of the Universe for energetic gamma rays. Popular explanations include conversion of photons into hypothetical axion-like particles (ALPs) and back in astrophysical magnetic fields.
Troitsky, Sergey
core   +1 more source

X-ray and Radio Follow-up Observations of High-Redshift Blazar Candidates in the Fermi-LAT Unassociated Source Population

, 2013
We report on the results of X-ray and radio follow-up observations of two GeV gamma-ray sources 2FGL J0923.5+1508 and 2FGL J1502.1+5548, selected as candidates for high-redshift blazars from unassociated sources in the {\it Fermi} Large Area Telescope ...
Honma, M., Inoue, S., Inoue, Y., Kataoka, J., Maeda, K., Nakamori, T., Niinuma, K., Takahashi, Y., Totani, T.   +8 more
core   +1 more source

The blazar's divide and the properties of Fermi blazars

, 2009
8 pages, 8 figures. Invited talk at the meeting: Accretion and ejection in AGN: a global view (Como, June 2009). To be published in Astron. Soc. of the Pacific Conf. Series (ASPCS)
openaire   +2 more sources

Hunting Very High-energy-emitting (>100 GeV) High-synchrotron-peaked Blazars

The Astrophysical Journal Supplement Series
Very high-energy (VHE; >100 GeV) γ -ray emission originates via some of the most extreme particle acceleration processes in the Universe. Considering beamed active galactic nuclei, i.e., blazars, only a small fraction, mainly high-synchrotron-peaked BL ...
Sushmita Agarwal, Vaidehi S. Paliya
doaj   +1 more source

The physical properties of candidate neutrino-emitter blazars [PDF]

EPJ Web of Conferences
High-energy neutrinos detected by the IceCube Observatory provide a unique opportunity to study the origin of cosmic rays and the nature of the sources producing them.
Azzollini A., Buson S., Coleiro A., Fichet de Clairfontaine G., Pfeiffer L., Sanchez Zaballa J. M., Boughelilba M., Lincetto M.   +7 more
doaj   +1 more source

Fermi detected blazars seen by INTEGRAL

, 2009
Multiwavelength observations are essential to constrain physical parameters of the blazars observed by Fermi/LAT. Among the 187 AGN significantly detected in public INTEGRAL data above 20 keV by the imager IBIS/ISGRI, 20 blazars were detected.
Beckmann, V., Ricci, C., Soldi, S.
core   +1 more source

Modeling the Emission Processes in Blazars

, 2006
Blazars are the most violent steady/recurrent sources of high-energy gamma-ray emission in the known Universe. They are prominent emitters of electromagnetic radiation throughout the entire electromagnetic spectrum.
A. Achterberg, A. Atoyan, A. Cavaliere, A. Mastichiadis, A. Mastichiadis, A. Mücke, A. Mücke, A. Mücke, A. Pe’er, A. Reimer, A. Sokolov, A. Sokolov, A.E. Wehrle, A.P. Marscher, C. Arbeiter, C. von Montigny, C.D. Dermer, C.D. Dermer, D. Kazanas, D. Petry, E. Pian, F. Aharonian, F.M. Rieger, G. Fossati, G. Fossati, G. Ghisellini, G. Ghisellini, G. Ghisellini, G. Ghisellini, G. Madejski, H. Krawczynski, H. Krawczynski, H. Kubo, H. Li, J. Kataoka, J. Niemiec, J. Rachen, J.A. Gaidos, J.G. Kirk, J.J.P. Virtanen, J.R. Mattox, K. Mannheim, K. Mannheim, L. Maraschi, L. Maraschi, L. Stawarz, M. Blażejowski, M. Blażejowski, M. Böttcher, M. Böttcher, M. Böttcher, M. Böttcher, M. Böttcher, M. Böttcher, M. Böttcher, M. Böttcher, M. Georganopoulos, M. Georganopoulos, M. Kino, M. Kusunose, M. Kusunose, M. Lainela, M. Ostrowski, M. Ostrowski, M. Pohl, M. Ravasio, M. Sikora, M. Sikora, M. Sikora, M. Sikora, M. Spada, M. Villata, Markus Böttcher, R. Moderski, R. Mukherjee, R. Mukherjee, R. Sambruna, R. Sambruna, R. Schlickeiser, R. Vainio, R.C. Hartman, R.C. Hartman, R.C. Hartman, S.D. Bloom, T. Takahashi, V. D’Elia, W. Bednarek, W. Collmar, Y.H. Zhang   +88 more
core   +1 more source

Polarization in Blazars [PDF]

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).
openaire   +1 more source

BlazEr1: The eROSITA Blazar Catalog. Blazars and Blazar Candidates in the First eROSITA Survey

39 pages, 28 figures, accepted for publication in A& ...
Haemmerich, S., Gokus, A., McBride, F., Weber, P., Marcotulli, L., Zainab, A., Collmar, W., Salvato, M., Wolf, J., Sbarrato, T., Belladitta, S., Buchner, J., Saeedi, S., Dauner, L., Lorenz, M., Koenig, O., Kirsch, C., Berger, K., Bahic, S., Tubin-Arenas, D., Krumpe, M., Homan, D., Markowitz, A., Benke, P., Roesch, F., Kavitha, P. Rajasekar, Tambe, H., Kadler, M., Ros, E., Ojha, R., Wilms, J.   +30 more
openaire   +2 more sources