Results 41 to 50 of about 161,008 (274)
IRAS observations of active galaxies [PDF]
, 1986 The IRAS survey gives an unbiased view of the infrared properties of the active galaxies. Seyfert galaxies occupy much the same area in color-color plots as to normal infrared bright galaxies, but extend the range towards flatter 60 to 25 mm slopes ...
AR Sandage +11 more
core +2 more sources
The coronal parameters of local Seyfert galaxies [PDF]
Astronomische Nachrichten, 2016 AbstractOne of the open problems for AGN is the nature of the primary X‐ray emission: It is likely due to Comptonization of soft UV photons, but the optical depth and temperature of the emitting corona were largely unknown before the launch of the Nuclear Spectroscopic Telescope Array (NuSTAR).
Marinucci, A., Tortosa, A.
openaire +7 more sources
Recent Results from the SAFIR Project
Acta Polytechnica CTU Proceedings, 2014 The "Seyfert and star formation Activity in the Far-Infrared" (SAFIR) project is aimed at studying the physical nature of the nuclear IR emission and star formation properties of a small sample of nearby Seyfert galaxies observed with the PACS and SPIRE ...
M. Sánchez-Portal +18 more
doaj +1 more source
The Kiloparsec-scale Influence of the AGN in NGC 1068 with SALT RSS Fabry–Pérot Spectroscopy
The Astronomical Journal, 2023 We present Fabry–Pérot (FP) imaging and longslit spectroscopy of the nearby Seyfert II galaxy NGC 1068 using the Robert Stobie Spectrograph (RSS) on the Southern African Large Telescope (SALT) to observe the impact of the central active galactic nucleus (
Raphael E. Hviding +4 more
doaj +1 more source
Far-Infrared Census of Starburst-Seyfert Connection [PDF]
ApJ, 565, 786 [2002], 2001 Far-infrared flux densities are newly extracted from the IRAS database for the RSA and CfA complete samples of Seyfert galaxies. These data are used to classify the Seyfert galaxies into those where the far-infrared continuum emission is dominated by the active galactic nucleus (AGN), circumnuclear starburst, or host galaxy.
arxiv +1 more source
What We Talk about When We Talk about Blazars?
Frontiers in Astronomy and Space Sciences, 2017 After the discovery of powerful relativistic jets from Narrow-Line Seyfert 1 Galaxies, and the understanding of their similarity with those of blazars, a problem of terminology was born.
Luigi Foschini
doaj +1 more source
Optical Spectroscopy of the IRAS 1-Jy Sample of Ultraluminous Infrared Galaxies [PDF]
, 1999 This paper discusses the optical spectroscopic properties of the IRAS 1-Jy sample of ultraluminous infrared galaxies (ULIGs). One hundred and eight of the 118 1-Jy ULIGs have been observed at dlambda = 8.3 AA resolution over the wavelength range ~4500 A -
Allen D. A. +14 more
core +2 more sources
Continuous Filament Network of the Local Universe
The Astrophysical Journal, 2023 Simulated galaxy distributions are suitable for developing filament detection algorithms. However, samples of observed galaxies, being of limited size, cause difficulties that lead to a discontinuous distribution of filaments.
Anatoliy Tugay, Mariusz Tarnopolski
doaj +1 more source
A New Sample of Gamma-Ray Emitting Jetted Active Galactic Nuclei—Preliminary Results
Universe, 2021 We are compiling a new list of gamma-ray jetted active galactic nuclei (AGN), starting from the fourth catalog of point sources of the Fermi Large Area Telescope (LAT).
Luigi Foschini +10 more
doaj +1 more source
Molecular gas dynamics around nuclei of galaxies [PDF]
EPJ Web of Conferences, 2022 Recent molecular line observations with ALMA in several nearby Seyferts have revealed the existence of molecular tori, and the nature of gas flows at 10-20 pc scale.
Combes Françoise
doaj +1 more source