Results 11 to 20 of about 573 (139)
Properties of Galaxies with Peculiar Nuclei [PDF]
Publications of the Astronomical Society of the Pacific, 1967 In a former note (Sersic and Pastoriza 1965) we published the results of a survey of bright southern galaxies which were inspected for peculiarities in their nuclei. Although the sample was small ( 35 galaxies) it suggested a relationship between the existence of a bar and the presence of abnormal features in their nuclei.
Sérsic, José Luis, 1933-1993 +1 more
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Galaxies with Binary Nuclei [PDF]
Proceedings of the International Astronomical Union, 2013 AbstractIt is known that among active galaxies (AG) with strong emission lines (UV-galaxies, Sy1 and Sy2, Markarian and Kazarian galaxies, radio-galaxies, QSOs host galaxies and so on) there is a large percentage of objects with double and multiple (or complex) nuclei.
Yervant Terzian, Edward Khachikian
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Galaxies and Their Nuclei [PDF]
Highlights of Astronomy, 1974 Our Extraordinary General Assembly is devoted to the memory of one of the greatest men of science to the genial Polish astronomer - Nicolaus Copernicus. The main service of Copernicus which has made his name immortal was in finding the correct interpretation of the planetary motions we observe.
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Merging Galaxies with Active Nuclei [PDF]
Symposium - International Astronomical Union, 1999 We are investigating a sample of nearby interacting and merging galaxies showing starburst properties and/or nonthermal nuclear activity (e.g. Mrk 231, Mrk 739, Mrk 1027, NGC 2992, Arp 92).
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Active galactic nuclei and galaxy interactions [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 We perform a statistical analysis of active galactic nucleus (AGN) host characteristics and nuclear activity for AGNs in pairs and without companions. Our study concerns a sample of AGNs derived from the Sloan Digital Sky Survey Data Release 4 data by Kauffmann et al. and pair galaxies obtained from the same data set by Alonso et al.
Alonso, M. Sol +3 more
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Young nuclei in dwarf elliptical galaxies [PDF]
Astronomy Letters, 2007 accepted to "Astronomy Letters". Version for astro-ph with colour figures.
Chilingarian, Igor V. +3 more
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An atlas of mid-infrared spectra of galaxy nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 1991 The spectral energy distributions are presented for 60 galaxies for which 8-13 μm, and in some cases 17-23 μm, spectra have been obtained. These IR bright galaxies are discussed in terms of their spectral properties in the mid-IR and the relationship with their far-IR properties.
Roche, P, Aitken, D, Smith, C, Ward, M
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Interacting Nuclei in Distant Galaxies [PDF]
International Astronomical Union Colloquium, 1990 The interaction of galaxies not only occurs in galactic scales, but also may be linked to the binary cores in active galactic galaxies. The presence of a binary in the center of galaxies was suggested by Begelman, Blandford and Rees (1980). Gaskell (1983) suggests that supermassive binaries may account for the observed structure of emission line ...
Wei Zheng, Steven A. Grandi
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Anatomical and histological characterization of the heart of the scarlet ibis (Eudocimus ruber)
The Anatomical Record, EarlyView.The graphical abstract illustrates the scarlet ibis (Eudocimus ruber) and two views of its heart (ventral and dorsal), highlighting its external morphology. The study also employed complementary approaches, including morphometric analysis, radiography, histological examination, and scanning electron microscopy, to provide a comprehensive ...
Beatriz Rosa Silva +7 more
wiley +1 more source
Principal Component‐Based Classification of Blazar Candidates of Uncertain Type in the 4FGL/LAT
Astronomische Nachrichten, EarlyView.ABSTRACT We adopted principal component analysis (PCA), linear discriminant analysis (LDA), and support vector machines (SVM), to study classification for a sample of 2708 Fermi blazars: 1142 BL Lac objects (BLLs), 759 flat spectrum radio quasars (FSRQs), and 807 blazar candidates of uncertain type (BCUs).
Wen‐Xin Yang +13 more
wiley +1 more source