Results 21 to 30 of about 3,423,233 (292)

Active galaxies and radiative heating

open access: yesPhilosophical 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   +3 more sources

Is There a Metallicity-Luminosity Relationship in Active Galactic Nuclei? The Case of Narrow-Line Seyfert 1 Galaxies [PDF]

open access: yes, 2002
This article discusses the relationship between metallicity and luminosity in active galactic nuclei by introducing new metallicity measurements for a sample of narrow-line Seyfert 1 ...
Netzer, Hagai   +3 more
core   +1 more source

GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469

open access: yesThe Astrophysical Journal Letters, 2023
We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science program 1328 ...
L. Armus   +34 more
doaj   +1 more source

Shape asymmetry : a morphological indicator for automatic detection of galaxies in the post-coalescence merger stages [PDF]

open access: yes, 2016
MMP and VW acknowledge support from the European Career Reintegration Grant Phiz-Ev (P.I. VW). VW, KR and JM-A acknowledge support from the European Research Council Starting Grant SEDMorph (P.I. VW).
Wild, V.   +18 more
core   +1 more source

Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS

open access: yesThe Astrophysical Journal, 2023
Active dwarf galaxies are important because they contribute to the evolution of dwarf galaxies and can reveal their hosted massive black holes. However, the sample size of such sources beyond the local universe is still highly limited.
Fan Zou   +12 more
doaj   +1 more source

Active galaxies and cluster gas [PDF]

open access: yesPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2005
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 clusters, the second is to solve the cooling–flow problem in cluster cores.
openaire   +3 more sources

Galaxy Zoo:dust in spiral galaxies [PDF]

open access: yes, 2010
We investigate the effect of dust on spiral galaxies by measuring the inclination dependence of optical colours for 24 276 well-resolved Sloan Digital Sky Survey (SDSS) galaxies visually classified via the Galaxy Zoo project.
Masters, Karen L.   +33 more
core   +1 more source

Chemical abundances in active galaxies [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2020
ABSTRACT The Sloan Digital Sky Survey (SDSS) has proved to be a powerful resource for understanding the physical properties and chemical composition of star-forming galaxies in the local Universe. The SDSS population of active galactic nuclei (AGNs) remains as of yet less explored in this capacity.
Flury, Sophia R., Moran, Edward C.
openaire   +2 more sources

Euclid Quick Data Release (Q1)

open access: yesAstronomy & Astrophysics
Active galactic nuclei (AGN) are an important phase in galaxy evolution. However, they can be difficult to identify due to their varied observational signatures.
Margalef-Bentabol B.   +332 more
doaj   +3 more sources

Accretion-modified Stars in Accretion Disks of Active Galactic Nuclei: The Low-luminosity Cases and an Application to Sgr A*

open access: yesThe Astrophysical Journal Letters, 2023
In this paper, we investigate the astrophysical processes of stellar-mass black holes (sMBHs) embedded in advection-dominated accretion flows (ADAFs) of supermassive black holes (SMBHs) in low-luminosity active galactic nuclei.
Jian-Min Wang   +5 more
doaj   +1 more source

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