Results 91 to 100 of about 38,529 (262)

Kiloparsec-Scale Jets in FR I Radio Galaxies and the Gamma-Ray Background

, 2005
We discuss the contribution of kiloparsec-scale jets in FR I radio galaxies to the diffuse gamma-ray background radiation. The analyzed gamma-ray emission comes from inverse-Compton scattering of starlight photon fields by the ultrarelativistic electrons
Aharonian F., Bloom E. D., Falle S. A. E. G., J. Kataoka, Komissarov S. S., Nikishov A. I., Padovani P., Parma P., Protheroe R. J., Protheroe R. J., T. M. Kneiske, Weferling B., Ł. Stawarz   +12 more
core   +1 more source

Unified model for cosmic rays above $10^{17}$ eV and the diffuse gamma-ray and neutrino backgrounds

, 2015
We investigate how the extragalactic proton component derived within the "escape model" can be explained by astrophysical sources. We consider as possible cosmic ray (CR) sources normal/starburst galaxies and radio-loud active galactic nuclei (AGN).
Giacinti, G., Kachelriess, M., Kalashev, O., Neronov, A., Semikoz, D. V.   +4 more
core   +1 more source

A Census of the Deep Radio Sky with the VLA. I. 10 GHz Survey of the GOODS-N Field

The Astrophysical Journal
We present the first high-resolution, high-frequency radio continuum survey that fully maps an extragalactic deep field: the 10 GHz survey of the Great Observatories Origins Deep Survey-North (GOODS-N) field. This is a Large Program of the Karl G. Jansky
Eric F. Jiménez-Andrade, Eric J. Murphy, Emmanuel Momjian, James J. Condon, Ranga-Ram Chary, Russ Taylor, Mark Dickinson   +6 more
doaj   +1 more source

Confinement of Extragalactic Radio Sources by Massive Objects [PDF]

, 1976
Philip S. Callahan
openalex   +1 more source

A Multimechanism Hybrid Model of Peaked-spectrum Radio Sources

The Astrophysical Journal
Peaked-spectrum (PS) sources exhibit turnover characteristics in their broad radio spectra. However, the mechanism underlying this phenomenon remains elusive.
Guang-Chen Sun, Yichao Li, Furen Deng, Yanping Cong, Fangxia An, Jiajun Zhang, Yougang Wang, Xin Zhang, Xuelei Chen   +8 more
doaj   +1 more source

Spectral Index Studies of Extragalactic Radio Sources [PDF]

, 1977
P. Katgert, L. Padrielli, J. K. Katgert, A. Willis   +3 more
openalex   +1 more source

Extragalactic source contributions to arcminute-scale Cosmic Microwave Background anisotropies

, 2004
The possible contributions of the various classes of extragalactic sources (including, in addition to the canonical radio sources, GHz Peaked Spectrum sources, advection-dominated sources, starburst galaxies, high-redshift proto-spheroidal galaxies) to ...
Bennett, Blain, Blake, Bressan, Chapman, Ciaramella, Cooray, Dallacasa, Dawson, De Zotti, De Zotti, De Zotti, Dunlop, Dupac, Dupac, F. Argüeso, Fomalont, Fomalont, Franceschini, G. De Zotti, G. L. Granato, Galliano, Gnedin, González-Nuevo, Granato, Granato, Greve, Griffiths, Gruppioni, Haiman, Impey, J. González-Nuevo, Komatsu, Kuo, L. Silva, L. Toffolatti, Loan, M. Negrello, Magliocchetti, Mason, Myers, Narayan, Negrello, Perna, Perrotta, Pierpaoli, Pozzi, Reach, Readhead, Rebolo, Ricci, Richards, Scott, Scott, Silva, Silva, Spergel, Teräsranta, Tinti, Toffolatti, Van Waerbeke, Waldram, Windhorst, Zhang   +63 more
core   +1 more source

Constraining the Faint-end Slope of the Fast Radio Burst Energy Function Using CHIME/FRB Catalog-1 and Local Volume Galaxies

The Astrophysical Journal
Despite hundreds of detected fast radio bursts (FRBs), the faint-end slope ( γ ) of their energy distribution remains poorly constrained, hindering understanding of whether bright, cosmological FRBs and faint, Galactic magnetar SGR 1935+2154-like bursts ...
Mohit Bhardwaj, Victoria M. Kaspi, K. W. Masui, B. M. Gaensler, Adaeze L. Ibik, Mawson W. Sammons   +5 more
doaj   +1 more source

Optical Spectra of Extragalactic Radio Sources [PDF]

Highlights of Astronomy, 1968
Extragalactic radio sources can be grouped spectroscopically into those that show absorption lines produced by a stellar population (e.g. the nearer radio galaxies, and some more distant ones, usually of D or E type) and those that show only lines (usually in emission) produced by low-density gas (e.g. QSO’s and many N-type galaxies).
openaire   +1 more source

Radio-Excess IRAS Galaxies: PMN/FSC Sample Selection

, 2003
A sample of 178 extragalactic objects is defined by correlating the 60 micron IRAS FSC with the 5 GHz PMN catalog. Of these, 98 objects lie above the radio/far-infrared relation for radio-quiet objects.
Altschuler D. R., Bajaja E., Bennett A. S., Black A. R. S., Blundell K. M., Capetti A., Carvalho J. C., Carvalho J. C., Carvalho J. C., Catherine L. Drake, Cram L. E., de Grijp M. H. K., de Grijp M. H. K., de Jong T., Fanaroff B. L., Fanti C., Fanti C., Fanti C., Fanti R., Heckman T. M., Kuhr H., Leahy J. P., Michael A. Dopita, Miller L., Mirabel I. F., Morganti R., Morganti R., Norris R. P., Owsianik I., O’Dea C. P., O’Dea C. P., Pedler A., Peter J. McGregor, Phillips R. B., Roy A. L., Sadler E. M., Saikia D. J., Slee O. B., Sopp H. M., Spencer R. E., van der Kruit P. C., Veron-Cetty M.-P., W. J. M. van Breugel, Wunderlich E., Zheng Z.   +44 more
core   +1 more source