Results 61 to 70 of about 37,310 (215)

Observational Evidence of Accretion Disk-Caused Jet Precession in Galactic Nuclei

, 2005
We show that the observational data of extragalactic radio sources tend to support the theoretical relationship between the jet precession period and the optical luminosity of the sources, as predicted by the model in which an accretion disk causes the ...
Appl S., Bo-Yan Zhou, Collin-Souffrin S., Fanti C., Florido E., Hummel C. A., Hummel C. A., Hunstead R. W., Ju-Fu Lu, Klein U., Lu J. F., Nan R., Parma P., Rieger F. M., Roos N., Saikia D. J., Shakura N., van Ojik R., Vicente L.   +18 more
core   +2 more sources

The Fanaroff-Riley Transition and the Optical Luminosity of the Host Elliptical Galaxy [PDF]

, 2001
We show that a model for radio source dynamics we had earlier proposed can readily reproduce the relationship between the radio power division separating the two Fanaroff-Riley classes of extragalactic radio sources and the optical luminosity of the host
Gopal-Krishna, Wiita, Paul J.
core   +2 more sources

Populations of Extragalactic Radio Sources [PDF]

Australian Journal of Physics, 1994
In the late 1950s and early 1960s, radio sky surveys were the centre of an intense and public debate-Big-Bang versus Steady-State cosmology-the arguments revolving about source counts and statistical interpretations in the face of instrumental complications.
openaire   +1 more source

JWST imaging of the closest globular clusters—I. Possible infrared excess among white dwarfs in NGC 6397

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We present James Webb Space Telescope observations of the globular cluster NGC 6397 and use them to extend to infrared wavelengths the characterization of the cluster's entire white dwarf (WD) cooling sequence (CS). The data allows us to probe fundamental astrophysical WD properties and to search for evidence in their colors for (or against ...
L. R. Bedin, D. Nardiello, M. Salaris, M. Libralato, P. Bergeron, A. J. Burgasser, D. Apai, M. Griggio, M. Scalco, J. Anderson, R. Gerasimov, A. Bellini   +11 more
wiley   +1 more source

Milestones in the Observations of Cosmic Magnetic Fields [PDF]

, 2002
Magnetic fields are observed everywhere in the universe. In this review, we concentrate on the observational aspects of the magnetic fields of Galactic and extragalactic objects.
Alfven H., Anantharamaiah K. R., Andreasyan R. R., Appenzeller I., Argon A. L., Athreya R. M., Axon D. J., Baker J. R., Baker J. R., Baryshnikova I., Battaner E., Beck R., Behr A., Bel N., Berdyugin A., Berdyugin A., Berkhuijsen E. M., Berkhuijsen E. M., Berkhuijsen E. M., Beuermann K., Bhatt H. C., Bicknell G. V., Biermann L., Bingham R. G., Birk G. T., Blackman E. G., Blackman E. G., Blackman E. G., Blasi P., Bourke T. L., Bower G. C., Brandenburg A., Brandenburg A., Brandenburg A., Bridle A. H., Brouw W. N., Brown J. C., Brunthaler A., Carilli C. L., Caswell J. L., Chy_zy K. T., Cimatti A., Clarke T. E., Contopoulos I., Cooper B. F. C., Costa M. E., Crutcher R. M., Crutcher R. M., Crutcher R. M., Cudlip W., Dahlem M., de Araujo J. C. N., Deiss B. M., Dickey J. M., Dickey J. M., Dombrovsky V. A., Dowell C. D., Draper P. W., Dumke M., Duncan A. R., Duncan A. R., Duncan A. R., Eilek J. A., Elvius A., Elvius A., Elvius A., Fendt C., Fendt C., Feretti L., Ferriere K., Fiebig D., Fosalba P., Furlanetto S. R., Furst E., Furst E., Gaensler B. M., Gardner F. F., Gardner F. F., Gavazzi G., Gnedin N. Y., Golla G., Gomez de Castro A. I., Goodman A. A., Gray A. D., Greaves J. S., Greaves J. S., Hall J. S., Hamilton P. A., Han J. L., Han J. L., Han J. L., Han J. L., Han J. L., Hanisch R. J., Harris D. E., Harris D. E., Harrison E. R., Haslam C. G. T., Haslam C. G. T., Haslam C. G. T., Haverkorn M., Haynes R. F., Haynes R. F., Haynes R. F., Heiles C., Heiles C., Henriksen M., Hogbom J. A., Holland W. S., Homan D. C., Houde M., Howard A. M., Inoue M., Inoue M., Jin-Lin Han, Johnson R. A., Junkes N., Kempner J. C., King D. J., Kishimoto M., Klaas U., Klare G., Klein U., Klein U., Knapik J., Kolatt T., Korhonen T., Krause F., Krause F., Krause M., Krause M., Krause M., Krautter J., Kronberg P. P., Kronberg P. P., Kronberg P. P., Kulsrud R. M., Landecker T. L., Lang C. C., Lang C. C., LaRosa T. N., LaRosa T. N., Leroy J. L., Lesch H., Levin S. M., Li Z., Liang H., Loden L. O., Lyne A. G., Lähteenmäki A., Macquart J.-P., Manchester R. N., Markevitch M., Markkanen T., Mathewson D. S., Mathewson D. S., Mathewson D. S., Mathewson D. S., McClure-Griffiths N. M., Mestel L., Mitra D., Momose M., Morris M., Moss D., Neininger N., Neininger N., Novak G., Novak G., Novak G., Onaka T., Oort J. H., Parker E. N., Pawsey J. L., Piddington J. H., Pierce-Price D., Qiao G. J., Rand R. J., Rao R., Razin V. A., Rees M. J., Reich W., Reich W., Reich W., Reich W., Reich W., Reuter H.-P., Richard Wielebinski, Rohde R., Ruzmaikin A. A., Ruzmaikin A. A., Ryle M., Sarma A. P., Sarma A. P., Scarrott S. M., Scarrott S. M., Scarrott S. M., Scarrott S. M., Scarrott S. M., Scarrott S. M., Schekochihin A. A., Schleuning D. A., Schlickeiser R., Schmidt T., Schroder R., Serkowski K., Shklovsky I. S., Sicotte H., Sofue Y., Sofue Y., Sofue Y., Spoelstra T. A. T., Spoelstra T. A. T., Spoelstra T. A. T., Spoelstra T. A. T., Spoelstra T. A. T., Steenbeck M., Steenbeck M., Stix M., Subramanian K., Subramanian K., Tabara H., Tadhunter C. N., Tamura M., Taylor G. B., Thomson R. C., Thum C., Tosa M., Totani T., Udomprasert P. S., Vallee J. P., Vallee J. P., Vallee J. P., van Ommen, Venturi T., Walmsley M., Ward-Thompson D., Westerhout G., Wiechen H., Wielebinski R., Wielebinski R., Wielebinski R., Wielebinski R., Wieringa M. H., Wilkinson A., Willson M. A. G., Woltjer L., Wood K., Yusef-Zadeh F., Yusef-Zadeh F., Zeldovich I. B., Zheng X.   +250 more
core   +2 more sources

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source

Rotation Measure Jitter: Wavelength-dependent Scatter in Rotation Measure Related to Faraday Complexity

The Astrophysical Journal
The relation between Faraday rotation measure (RM) and differential Faraday rotation by unresolved structure of a turbulent plasma is investigated for extragalactic radio sources.
Jeroen M. Stil
doaj   +1 more source

Galactic HCO+ Absorption toward Compact Extragalactic Radio Sources

, 2018
As part of the search for the "dark molecular gas (DMG)," we report on the results of HCO$^+$ J = 1-0 absorption observations toward nine bright extragalactic millimeter wave continuum sources. The extragalactic sources are at high Galactic latitudes (|b|
Byun, Do-Young, Heiles, Carl E., Kim, Kee-Tae, Koo, Bon-Chul, Park, Geumsook   +4 more
core   +1 more source

Counts of Extragalactic Radio Sources [PDF]

Australian Journal of Physics, 1961
In this paper a formula is derived giving the cumulative totals of class II radio sources, to successive limits of flux density, when changes in the space· density and in the radiative properties of these sources are taken into account.
openaire   +1 more source

Effects of Forbush Decreases on the Global Electric Circuit

Space Weather, Volume 22, Issue 4, April 2024.
Abstract The suppression of high‐energy cosmic rays, known as Forbush decreases (FDs), represents a promising factor in influencing the global electric circuit (GEC) system. Researchers have delved into these effects by examining variations, often disruptive, of the potential gradient (PG) in ground‐based measurements taken in fair weather regions.
J. Tacza, G. Li, J.‐P. Raulin
wiley   +1 more source