7.1k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- National Institute for AstrophysicsIT1.2k papers
- University of BolognaIT1.1k papers
- Centre National de la Recherche ScientifiqueFR830 papers
- Leiden UniversityNL562 papers
- University of PaduaIT461 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR449 papers
- Astrophysique, Instrumentation et ModélisationFR424 papers
- Center for Astrophysics Harvard & SmithsonianUS420 papers
- Netherlands Institute for Radio AstronomyNL418 papers
- Osservatorio Astronomico di PadovaIT411 papers
- Osservatorio astronomico di BolognaIT398 papers
- California Institute of TechnologyUS397 papers
30 papers · 2 filters
Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow
LAT Collaboration, GBM Collaboration, Swift Collaboration +2
We report on the multiwavelength observations of the bright, long gamma-ray burst \GRB, by the \Fermi and \Swift observatories, and by the MOA and GROND optical telescopes. The ana…
VLBI Imagings of Kilo-parsec Knot in 3C 380
Shoko Koyama, Motoki Kino, Hiroshi Nagai +3
We investigate observational properties of a kilo-parsec scale knot in radio-loud quasar 3C 380 by using two epoch archival data obtained by Very Long Baseline Interferometry (VLBI…
Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations
H. J. Pletsch, L. Guillemot, H. Fehrmann +150
Millisecond pulsars, old neutron stars spun-up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "…
Chandra Observations of 3C Radio Sources with z<0.3 II: completing the snapshot survey
F. Massaro, G. R. Tremblay, D. E. Harris +14
We report on the second round of Chandra observations of the 3C snapshot survey developed to observe the complete sample of 3C radio sources with z<0.3 for 8 ksec each. In the firs…
Radio and gamma-ray follow-up of the exceptionally high activity state of PKS 1510-089 in 2011
M. Orienti, S. Koyama, F. D'Ammando +24
We investigate the radio and gamma-ray variability of the flat spectrum radio quasar PKS 1510-089 in the time range between 2010 November and 2012 January. In this period the sourc…
GENJI Programme: Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI
Hiroshi Nagai, Motoki Kino, Kotaro Niinuma +11
We introduce the GENJI program (Gamma-ray Emitting Notable AGN Monitoring by Japanese VLBI), which is a monitoring program of gamma-ray bright AGNs with the VERA array (VLBI Explor…
Radio Detection of the Fermi LAT Blind Search Millisecond Pulsar J1311-3430
P. S. Ray, S. M. Ransom, C. C. Cheung +15
We report the detection of radio emission from PSR J1311-3430, the first millisecond pulsar discovered in a blind search of Fermi Large Area Telescope (LAT) gamma-ray data. We dete…
To be or not to be a blazar. The case of the Narrow-Line Seyfert 1 SBS 0846+513
F. D'Ammando, M. Orienti, J. Finke
The presence of a relativistic jet in some radio-loud Narrow-Line Seyfert 1s (NLSy1) galaxies, first suggested by their variable radio emission and the flat radio spectra, is now c…
Radio-to-gamma-ray Monitoring of the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022 from 2008 to 2011
L. Foschini, E. Angelakis, L. Fuhrmann +39
We present more than three years of observations at different frequencies, from radio to high-energy gamma-rays, of the Narrow-Line Seyfert 1 (NLS1) Galaxy PMN J0948+0022 (z=0.585)…
Possible Detection of Apparent Superluminal inward motion in Markarian 421 after the Giant X-ray flare in February, 2010
K. Niinuma, M. Kino, H. Nagai +7
We report on the VLBI follow-up observations using the Japanese VLBI Network (JVN) array at 22 GHz for the largest X-ray flare of TeV blazar Mrk 421 that occurred in mid-February,…
PKS 2123-463: a confirmed gamma-ray blazar at high redshift
F. D'Ammando, A. Rau, P. Schady +11
The flat spectrum radio quasar (FSRQ) PKS 2123-463 was associated in the First Fermi-LAT source catalog with the gamma-ray source 1FGL J2126.1-4603, but when considering the full f…
VLBA monitoring of Mrk 421 at 15 GHz and 24 GHz during 2011
R. Lico, M. Giroletti, M. Orienti +13
High-resolution radio observations are ideal for constraining the value of physical parameters in the inner regions of active-galactic-nucleus jets and complement results on multiw…
Probing the origin of giant radio halos through radio and gamma-ray data : the case of the Coma cluster
G. Brunetti, P. Blasi, O. Reimer +3
We combine all available information about the spectral shape and morphology of the radio halo of the Coma cluster with the gamma-ray upper limits obtained by the Fermi-LAT and wit…
GRB110721A: An extreme peak energy and signatures of the photosphere
The Fermi LAT Collaboration, the GBM Collaboration, A. Pe'er
GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). The burst consisted o…
Fermi LAT study of cosmic-rays and the interstellar medium in nearby molecular clouds
LAT collaboration
We report an analysis of the interstellar gamma-ray emission from the Chamaeleon, R Coronae Australis (R CrA), and Cepheus and Polaris flare regions with the Fermi Large Area Teles…
SBS 0846+513: a new gamma-ray emitting Narrow-Line Seyfert 1 galaxy
F. D'Ammando, M. Orienti, J. Finke +11
We report Fermi-LAT observations of the radio-loud AGN SBS 0846+513 (z=0.5835), optically classified as a Narrow-Line Seyfert 1 galaxy, together with new and archival radio-to-X-ra…
Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state
M. Ackermann, M. Ajello, J. Ballet +208
The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuou…
Chandra X-ray Observations of the Two Brightest Unidentified High Galactic Latitude Fermi-LAT gamma-ray Sources
C. C. Cheung, D. Donato, N. Gehrels +2
We present Chandra ACIS-I X-ray observations of 0FGL J1311.9-3419 and 0FGL J1653.4-0200, the two brightest high Galactic latitude (|b|>10 deg) gamma-ray sources from the 3 month Fe…
Gamma-ray observations of the Orion Molecular Clouds with the Fermi Large Area Telescope
M. Ackermann, M. Ajello, A. Allafort +142
We report on the gamma-ray observations of giant molecular clouds Orion A and B with the Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope. The gamma-ray emis…
Fermi LAT Search for Dark Matter in Gamma-ray Lines and the Inclusive Photon Spectrum
LAT Collaboration, M. Ackermann, M. Ajello +117
Dark matter particle annihilation or decay can produce monochromatic gamma-ray lines and contribute to the diffuse gamma-ray background. Flux upper limits are presented for gamma-r…
VLBA monitoring of Mrk 421 at 15 and 24 GHz during 2011
R. Lico, M. Giroletti, M. Orienti +13
We present a preliminary analysis of new high resolution radio observations of the nearby TeV blazar Markarian 421 (z=0.031). This study is part of an ambitious multifrequency camp…
High resolution radio observations of gamma-ray emitting Narrow-Line Seyfert 1s
M. Orienti, F. D'Ammando, M. Giroletti
The detection by Fermi-LAT of gamma-ray emission from radio-loud Narrow-Line Seyfert 1s (NLS1s) indicates that relativistic jets do not form only in blazars and radio galaxies, but…
Assessing the Significance of Apparent Correlations Between Radio and Gamma-ray Blazar Fluxes
V. Pavlidou, J. L. Richards, W. Max-Moerbeck +13
Whether a correlation exists between the radio and gamma-ray flux densities of blazars is a long-standing question, and one that is difficult to answer confidently because of vario…
The gamma-ray emission region in the FRII Radio Galaxy 3C 111
Paola Grandi, Eleonora Torresi, Carlo Stanghellini
The Broad Line Radio Galaxy 3C 111, characterized by a Fanaroff-Riley II (FRII) radio morphology, is one of the sources of the Misaligned Active Galactic Nuclei sample, consisting…