Results 121 to 130 of about 149 (148)

Inferring End‐Members From Geoscience Data Using Simplex Projected Gradient Descent‐Archetypal Analysis

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 2, June 2025.
Abstract End‐member mixing analysis (EMMA) is widely used to analyze geoscience data for their end‐members and mixing proportions. Many traditional EMMA methods depend on known end‐members, which are sometimes uncertain or unknown. Unsupervised EMMA methods infer end‐members from data, but many existing ones don't strictly follow necessary constraints ...
Zanchenling Wang, Tao Wen
wiley   +1 more source

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Activity in colliding galaxies

Astrophysics and Space Science, 1993
A substantial body of evidence now exists that indicates that there is a connection between the observed activity in galaxies and the apparent involvement of these active galaxies in tidal interactions with other galaxies. To investigate this phenomenon, we are studying the morphologies and environments of various interacting galaxies showing evidence ...
Luis Colina, Kirk D. Borne
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Active galaxies

Astronomische Nachrichten, 2008
AbstractIn this paper I will review, in an unavoidably incomplete and biased way, the main results obtained by XMM‐Newton on Active Galactic Nuclei. I will then highlight the major issues still open in which XMM‐Newton can still give important contributions, expecially if the observing programs will shift in the future towards more long exposures of ...
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Circular Polarization of Active Galaxies

2023
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Active nuclei of galaxies

Astronomische Nachrichten, 1976
AbstractThe parameters of fifteen active nuclei are determined from spectroscopic and photometric observations. The values of bolometric luminosity, gas volume and mass, kinetic energy, characteristic dimension and kinematic time‐scale are given. The fluxes of radiative and mechanical energy of the gas envelope are compared. A steady‐state model of the
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Jets in Active Galaxies

Resonance, 2018
Jets in active galaxies are signatures of energy supply via collimated beams of plasma from the galactic nucleus to the extended regions of emission. These jets, which occur across the electromagnetic spectrum, are powered by supermassive black holes in the centres of the host galaxies.
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Sizes of active galaxies

Astrophysics, 2000
The diameters of active galaxies were compared with the diameters of ordinary galaxies. It is shown that, within the same luminosity limits, they do not differ clearly from each other. Starlike active galaxies in the samples of active galaxies have any possible luminosities.
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Activity in Liner and Starburst Galaxies

Astrophysics and Space Science, 1993
We find, using narrow-band imaging, a direct spatial coincidence between the location of bright [Fe II] 1.64µm line emission and compact steep spectrum radio sources in the nuclear region of the starburst galaxy NGC 253. For a large sample of active galaxies (starburst, LINER and Seyferts) we also find a strong correlation between the integrated ...
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Active Galaxies: Observations

2004
'Active galaxy' is a general term which refers to any galaxy that produces significant emission in addition to that from its constituent stars, stellar remnants and interstellar medium. The characterization of such galaxies as 'active' is because the unusual emission characteristics are generally assumed to be associated with high-energy, eruptive ...
Bradley M. Peterson, Belinda Jane Wilkes
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Active Galaxies and Peculiar Galaxies

2023
Bunshiro Takase, Keiichi Kodaira, Sadanori Okamura   +2 more
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