Results 21 to 30 of about 47,824 (185)
The molecular connection to the FIR-radio continuum correlation in galaxies [PDF]
Astronomy & Astrophysics, 2005 Accepted by A&A, 25 pages, 10 figures.
Matteo Murgia +8 more
openaire +4 more sources
Radio Emission of Nearby Early-type Galaxies at Low and Very-Low Radio Luminosity Range [PDF]
, 2022 We analyze radio continuum emission of early-type galaxies with dynamical measurements of central super-massive black hole (SMBH) masses, and well-characterized large-scale environments, but regardless on the exact level of the nuclear activity. The 1.4 GHz radio fluxes collected with $\sim$arcmin resolution for 62 nearby targets (distances $\lesssim ...
arxiv +1 more source
The Impact of GSM towers in Radio Astronomy [PDF]
2023 IEEE Radio and Antenna Days of the Indian Ocean (RADIO), 2023 Radio astronomy is a specialised area of astronomy that examines the radio emissions from astronomical bodies within the electromagnetic spectrum's radio range. As radio telescopes have become increasingly sensitive due to technological advancements, radio astronomers face the significant challenge of reducing the impact of human-generated radio ...
arxiv +1 more source
The genesis of morphologies in extended radio sources: X-shapes, off-axis distortions and giant radio sources [PDF]
Astrophys.J.695:156-170,2009, 2008 We examine relationships between the morphology in double radio sources and the radio-optical position angle offset--the relative orientation of the radio axis with respect to the major axis of the host galaxy. The study was done for a representative sample of radio sources: the nearby (redshift z < 0.5) 3CRR sources, and separately for samples of ...
arxiv +1 more source
Quasar Radio-Loudness and the Elliptical Core Problem [PDF]
(2010) MNRAS, 407, 2393, 2010 The dichotomy between radio-loud and radio-quiet QSOs is not simply one of host morphology. While spiral galaxies almost exclusively host radio-quiet QSOs, ellipticals can host either radio-louds or radio-quiets. We find that a combination of accretion rate and host scale determines which type of QSO a given elliptical galaxy will host.
arxiv +1 more source
The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars [PDF]
, 2020 We present the study on the X-ray emission for a sample of radio-detected quasars constructed from the cross-matches between SDSS, FIRST catalogs and XMM-Newton archives. A sample of radio-quiet SDSS quasars without FIRST radio detection is also assembled for comparison.
arxiv +1 more source
Evidence for radio loud to radio quiet evolution from red and blue quasars [PDF]
2020, PASP 132, 1017, 2020 Recent work on red and blue quasi-stellar objects (QSOs) has identified peculiar number distributions as a function of radio loudness that we explore and attempt to explain from the perspective of a picture in which a subset of the population of active galaxies evolves from the radio loud to the radio quiet state.
arxiv +1 more source
Radio and spectroscopic properties of miniature radio galaxies: revealing the bulk of the radio-loud AGN population [PDF]
, 2009 We explore radio and spectroscopic properties of a sample of 14 miniature radio galaxies, i.e. early-type core galaxies hosting radio-loud AGN of extremely low radio power, 10^(27-29) erg s^(-1) Hz^(-1) at 1.4 GHz. Miniature radio galaxies smoothly extend the relationships found for the more powerful FRI radio galaxies between emission line, optical ...
arxiv +1 more source
Radio continuum spectra of galaxies in the Virgo cluster region [PDF]
Astronomy & Astrophysics, 2004 New radio continuum observations of galaxies in the Virgo cluster region at 4.85, 8.6, and 10.55 GHz are presented. These observations are combined with existing measurements at 1.4 and 0.325 GHz. The sample includes 81 galaxies were spectra with more than two frequencies could be derived. Galaxies that show a radio-FIR excess exhibit central activity (
Richard Wielebinski +2 more
openaire +3 more sources
Radio continuum emission of the Milky Way and nearby galaxies [PDF]
Symposium - International Astronomical Union, 1985 The radio continuum emission of the Milky Way and nearby galaxies can be decomposed into a central region, a clumpy “thin disk”, concentrated in the spiral arms, and a smooth “thick disk” (or flattened “halo”). The emissivity ratio of the two disks seems to be related to the magnetic field properties: Galaxies with strong radio spiral arms reveal a ...
Wolfgang Reich, Rainer Beck
openaire +2 more sources