Results 31 to 40 of about 53,848 (207)

ON THE PROGRAM AND PRELIMINARY RESULTS OF INVESTIGATIONS OF INTRADAY AND INTERDIURNAL FLUX VARIABILITY OF EXTRAGALACTIC RADIO SOURCES AT TELESCOPES OF VENTSPILS INTERNATIONAL RADIO ASTRONOMY CENTER (VIRAC)

Radio Physics and Radio Astronomy, 2017
Purpose: From April 2017, a monitoring program of observations has been started at the RT-16 telescope of Ventspils Radio Astronomy Center (frequencies 5, 6.1, 6.7, 8.4 GHz) to study the intraday and interdiurnal variability of extragalactic radio ...
A. L. Sukharev, V. V. Bezrukovs, M. Y. Bleiders, A. A. Orbidans, M. I. Ryabov   +4 more
doaj   +1 more source

Opacity in compact extragalactic radio sources and its effect on radio-optical reference frame alignment [PDF]

, 2007
Accurate alignment of the radio and optical celestial reference frames requires detailed understanding of physical factors that may cause offsets between the positions of the same object measured in different spectral bands.
A. B. Pushkarev, A. P. Lobanov, Böttcher, J. A. Zensus, Kadler, Lara, Lestrade, Lobanov, Y. Y. Kovalev   +8 more
core   +1 more source

Extragalactic Results from the Infrared Space Observatory

, 2000
More than a decade ago the IRAS satellite opened the realm of external galaxies for studies in the 10 to 100 micron band and discovered emission from tens of thousands of normal and active galaxies.
Acosta-Pulido JA, Afonso C, Alexander T, Altieri B, Alton PB, Aussel H, Aussel H, Awaki H, Binette L, Boller T, Boselli A, Boselli A, Boulade O, Braine J, Catherine J. Cesarsky, Cesarsky CJ, Cesarsky D, Cesarsky D, Chapman SC, Clavel J, Clegg PE, Clements DL, Contursi A, de Graauw T, Desert FX, Desert FX, Doherty RM, Duley WW, Efstathiou A, Elbaz D, Fadda D, Fischer J, Flores H, Franceschini A, Gilmore G, Haas M, Haas M, Haas M, Hippelein H, Kawara K, Kegel WH, Kessler MF, Knapp GR, Krügel E, Kunze D, Lagache G, Lagache G, Lagache G, Lai O, Laureijs RJ, Laurent O, Laurent O, Lemke D, Lemonon L, Lord SD, Lutz D, Lutz D, Lutz D, Lutz D, Mattila K, Mattila K, Metcalfe L, Mirabel IF, Mirabel IF, Moorwood AFM, Moorwood AFM, Najarro F, Nakagawa T, Oliva E, Pagani L, Pfenniger D, Puget JL, Puget JL, Radovich M, Reinhard Genzel, Rigopoulou D, Rigopoulou D, Rigopoulou D, Rodriguez Espinosa JM, Rouan D, Roussel H, Rowan-Robinson M, Schaerer D, Scott D, Scoville NZ, Serjeant S, Siebenmorgen R, Stickel M, Sturm E, Sturm E, Taniguchi Y, Taniguchi Y, Tecza M, Thornley MD, Tran DQ, Tuffs RJ, Unger SJ, Valentijn EA, Verstraete L, Viegas SM, Vignati P, Vigroux L, Walter R, Wilkes BJ   +103 more
core   +1 more source

Parsec-scale structure in the warm ISM from polarized galactic radio background observations [PDF]

, 2001
We present multi-frequency polarization observations of the diffuse radio synchrotron background modulated by Faraday rotation, in two directions of positive latitude.
de Bruyn, A. G., Haverkorn, M., Katgert, P.   +2 more
core   +3 more sources

Symmetries in Stellar, Galactic, and Extragalactic Astronomy [PDF]

, 2021
Examples are presented for appearance of geometric symmetry in the shape of various astronomical objects and phenomena. Usage of these symmetries in astrophysical and extragalactic research is also discussed.
openaire   +2 more sources

Highlights from the IceCube Neutrino Observatory [PDF]

EPJ Web of Conferences
The IceCube Neutrino Observatory has been collecting data for more than a decade. During this time, it has heralded the birth of neutrino astronomy with the discovery of the astrophysical neutrino flux.
Aguilar Juan A.
doaj   +1 more source

The Kinematic Bimodality: Efficient Feedback and Cold Gas Deficiency in Slow-rotating Galaxies

The Astrophysical Journal Letters, 2023
The bimodality in the stellar spin of low-redshift (massive) galaxies, ubiquitously existing at all star formation levels and in diverse environments, suggests that galaxies grow and quench through two diverged evolutionary pathways.
Bitao Wang, Yingjie Peng
doaj   +1 more source

RadioAstron space-VLBI project: studies of masers in star forming regions of our Galaxy and megamasers in external galaxies [PDF]

, 2017
Observations of the masers in the course of RadioAstron mission yielded detections of fringes for a number of sources in both water and hydroxyl maser transitions. Several sources display numerous ultra-compact details. This proves that implementation of
Alakoz, A. V., Baan, W. A., Shakhvorostova, N. N., Sobolev, A. M.   +3 more
core   +1 more source

A strict lower-limit EBL: Applications on gamma-ray absorption

, 2008
A strict lower limit flux for the extragalactic background light from ultraviolet to the far-infrared photon energies is presented. The spectral energy distribution is derived using an established EBL model based on galaxy formation. The model parameters
Felix A. Aharonian, Frank Rieger, Herve Dole, Tanja M. Kneiske, Werner Hofmann   +4 more
core   +1 more source

A Y-band look of the sky with 1-m class telescopes [PDF]

, 2011
Y -band is a broad passband that is centered at ~ 1 micron. It is becoming a new, popular window for extragalactic study especially for observation of red objects thanks to recent CCD technology developments.
Choi, Changsu, Ibrahimov, Mansur, Im, Myungshin, Jeon, Yiseul   +3 more
core   +1 more source