Results 31 to 40 of about 156,542 (187)
VLT spectropolarimetry of two powerful radio galaxies at z~1.4: UV continuum, emission-line properties and the nature of high-redshift dust [PDF]
Mon.Not.Roy.Astron.Soc. 351 (2004) 997, 2004 (Abridged) Deep VLT spectropolarimetric observations are presented for two powerful radio galaxies, 0850-206 and 1303+091. These observations cover the rest-frame wavelength range ~ 1450 - 3750 A. New radio observations and continuum images of the same sources are also presented.
arxiv +1 more source
SEARCH FOR A COMPACT SCINTILLATING COMPONENT IN SNR 3С58 AT DECAMETER WAVELENGTHS
Radio Physics and Radio Astronomy, 2014 The upper limit for the flux of a compact source of continuum radio emission in SNR 3C58, (2.7 ± 0.9) Jy, was obtained by the highest sensitive observations of interplanetary scintillations at decameter wavelengths.
N. N. Kalinichenko
doaj +1 more source
On Measuring the 21 cm Global Spectrum of the Cosmic Dawn with an Interferometer Array
The Astrophysical Journal, 2023 We theoretically investigate the recovery of the global spectrum (monopole) from visibilities (cross-correlation only) measured by an interferometer array and the feasibility of extracting the 21 cm signal of the cosmic dawn.
Xin Zhang +4 more
doaj +1 more source
20cm VLA radio-continuum study of M31: Images and point source catalogues [PDF]
Serbian Astronomical Journal, 2012 We present a series of new high-sensitivity and high-resolution radio-continuum images of M31 at λ=20 cm (ν=1.4 GHz). These new images were produced by merging archived 20 cm radio-continuum observations from the Very Large Array (VLA) telescope.
Galvin T.J. +5 more
doaj +1 more source
Imprints of Molecular Clouds in Radio Continuum Images [PDF]
, 2012 We show radio continuum images of several molecular complexes in the inner Galaxy and report the presence of dark features that coincide with dense molecular clouds. Unlike infrared dark clouds, these features which we call "radio dark clouds" are produced by a deficiency in radio continuum emission from molecular clouds that are embedded in a bath of ...
arxiv +1 more source
Multiwavelength Variability Analysis of 3C 279
Frontiers in Astronomy and Space Sciences, 2017 We present a multifrequency analysis of the variability in the flat-spectrum radio quasar 3C 279 from 2008 to 2014. Our multiwavelength datasets range from 1 mm to gamma-rays, with additional optical polarimetry.
Víctor M. Patiño-Álvarez +8 more
doaj +1 more source
Estimation of the Flux at 1450 MHz of OB Stars for FAST and SKA
The Astronomical Journal, 2023 Radio observation is crucial to understanding the wind mechanism of OB stars but very scarce. This work estimates the flux at 1450 MHz ( S _1.4GHz ) of about 5000 OB stars identified by the LAMOST spectroscopic survey and confirmed by the Gaia ...
Qichen Huang +4 more
doaj +1 more source
6C radio galaxies at z~1: The influence of radio power on the alignment effect [PDF]
New Astron.Rev. 47 (2003) 255-260, 2003 Powerful radio galaxies often display enhanced optical/UV continuum emission and extended emission line regions, elongated and aligned with the radio jet axis. The expansion of the radio source strongly affects the gas clouds in the surrounding IGM, and the kinematic and ionization properties of the extended emission line regions display considerable ...
arxiv +1 more source
The Nature of Radio Continuum Emission in the Dwarf Starburst Galaxy NGC 625 [PDF]
Astrophys.J. 610 (2004) 772-780, 2004 We present new multi-frequency radio continuum imaging of the dwarf starburst galaxy NGC 625 obtained with the Very Large Array. Data at 20, 6, and 3.6 cm reveal global continuum emission dominated by free-free emission, with only mild synchrotron components. Each of the major HII regions is detected; the individual spectral indices are thermal for the
arxiv +1 more source
The Astrophysical Journal Letters, 2023 Recent studies have proposed that the nuclear millimeter continuum emission observed in nearby active galactic nuclei (AGNs) could be created by the same population of electrons that gives rise to the X-ray emission that is ubiquitously observed in ...
Claudio Ricci +12 more
doaj +1 more source