Minor mergers: fundamental but unexplored drivers of galaxy evolution
نویسندگان
چکیده
منابع مشابه
Minor mergers and the size evolution of elliptical galaxies
Using a high resolution hydrodynamical cosmological simulation of the formation of a massive spheroidal galaxy we show that elliptical galaxies can be very compact and massive at high redshift in agreement with recent observations. Accretion of stripped in-falling stellar material increases the size of the system with time and the central concentration is reduced by dynamical friction of the su...
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Based on numerical simulations of gas-rich galaxy mergers, we discuss a model in which quasar activity is tied to the self-regulated growth of supermassive black holes in galaxies. The nuclear inflow of gas attending a galaxy collision triggers a starburst and feeds black hole growth, but for most of the duration of the starburst, the black hole is “buried”, being heavily obscured by surroundin...
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Observations indicate the mass above which ellipticals dominate the galaxy population increases with redshift over the range 0 < z < 2, implying that galaxies transition from the blue to red sequence in a manner consistent with “cosmic downsizing.” Theories predict that mergers between gas-rich blue galaxies produce ellipticals, with an associated phase of bright quasar activity which expels an...
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The large-scale ( approximately 100 kpc) environments of Seyfert galaxies are not significantly different from those of non-Seyfert galaxies. In the context of the interaction model of the formation of active galactic nuclei (AGNs), it has thus been proposed that AGNs form via "minor mergers" of large disk galaxies with smaller companions. We test this hypothesis by comparing the nuclear spectr...
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We present the second of two papers concerning the origin and evolution of local early-type galaxies exhibiting dust features. We use optical and radio data to examine the nature of active galactic nucleus (AGN) activity in these objects, and compare these with a carefully constructed control sample. We find that dust lane early-type galaxies are much more likely to host emissionline AGN than t...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2015
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921316009042