Results 1 to 10 of about 4,320,326 (297)
Active Galaxies and Cluster Gas [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2004 Two lines of evidence indicate that active galaxies, principally radio galaxies, have heated the diffuse hot gas in clusters. The first is the general need for additional heating to explain the steepness of the X-ray luminosity--temperature relation in ...
Crawford C. S. +8 more
core +6 more sources
Astrophysics and Space Science, 2006 In this article we present different aspects of AGN studies demonstrating the importance of the UV spectral range. Most important diagnostic lines for studying the general physical conditions as well as the metalicities in the central broad line region ...
A. Koratkar +49 more
core +5 more sources
Narrow-line Seyfert 1 galaxies and the evolution of galaxies and active galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 Narrow Line Seyfert 1 galaxies (NLS1s) are intriguing due to their continuum as well as emission line properties. The observed peculiar properties of the NLS1s are believed to be due to accretion rate close to Eddington limit. As a consequence, for a given luminosity, NLS1s have smaller black hole (BH) masses compared to normal Seyfert galaxies.
Smita Mathur
openalex +3 more sources
On the Linearity of the Black Hole–Bulge Mass Relation in Active and in Nearby Galaxies [PDF]
, 2001 Analysis of PG quasar observations suggests a nonlinear relation between the black hole mass, M_BH, and the bulge mass, M_bulge, although a linear relation, as proposed for nearby galaxies, cannot be ruled out.
Ari Laor
openalex +5 more sources
Nuclear Activity in Nearby Galaxies [PDF]
Annual Review of Astronomy and Astrophysics, 2008 A significant fraction of nearby galaxies show evidence of weak nuclear activity unrelated to normal stellar processes. Recent high-resolution, multiwavelength observations indicate that the bulk of this activity derives from black hole accretion with a wide range of accretion rates.
Luis C Ho
exaly +4 more sources
The Surroundings of Disturbed, Active Galaxies [PDF]
The Astrophysical Journal, 2001 14 pages, Figs.
Halton Arp
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JWST Insight into a Lensed HST-dark Galaxy and Its Quiescent Companion at z = 2.58
The Astrophysical Journal Letters, 2023 Using the novel James Webb Space Telescope (JWST)/NIRCam observations in the A2744 field, we present a first spatially resolved overview of a Hubble Space Telescope (HST)-dark galaxy, spectroscopically confirmed at z = 2.58 with magnification μ ≈ 1.9 ...
Vasily Kokorev +15 more
doaj +1 more source
Outflows in the Disks of Active Galaxies [PDF]
The Astrophysical Journal, 2019 Abstract Recent advances in observations have provided a wealth of measurements of the expansions of outflows in galactic disks out to large radii in a variety of galactic hosts. To provide an updated baseline for the interpretation of such data, and to assess to what extent the present status of the modeling is consistent with the ...
Fabrizio Fiore +8 more
openaire +7 more sources
Active galaxies and radiative heating [PDF]
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2005 There is abundant evidence that heating processes in the central regions of elliptical galaxies have both prevented large–scale cooling flows and assisted in the expulsion of metal rich gas. We now know that each such spheroidal system harbours in its core a massive black hole weighing ca.
J. P. Ostriker, CIOTTI, LUCA
openaire +4 more sources
Testing the Radio-selection Method of Dual Active Galactic Nuclei in the Stripe 82 Field
The Astrophysical Journal, 2023 We test the merger-induced dual active galactic nuclei (dAGNs) paradigm using a sample of 35 radio galaxy pairs from the Sloan Digital Sky Survey Stripe 82 field.
Arran C. Gross +5 more
doaj +1 more source