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Galaxies 2016, 4(2), 5; doi:10.3390/galaxies4020005

Fossil Systems; a Multi-wavelength Approach towards Understanding Galaxy Formation

School of Astronomy, Institute for Research in Fundamental Sciences (IPM), 19395-5531 Tehran, Iran
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Academic Editors: José Alfonso López Aguerri, Enrichetta Iodice and Alexei Moiseev
Received: 2 November 2015 / Revised: 1 March 2016 / Accepted: 7 March 2016 / Published: 25 March 2016
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Abstract

Fossil systems are understood to be the end product of galaxy mergers within groups and clusters. Their halo morphology points to their relaxed/virialised nature, thus allowing them to be employed as observational probes for the evolution of cosmic structures, their thermodynamics and dark matter distribution. Cosmological simulations, and their underlying models, are broadly consistent with the early formation epoch for fossils. In a series of studies we have looked into galaxy properties and intergalactic medium (IGM) in fossils, across a wide range of wavelengths, from X-ray through optical to the radio, to have a better understanding of their nature, the attributed halo age, IGM heating and their AGNs and use them as laboratories to constrain galaxy formation models. Adhering to one of less attended properties of fossils, using the the Millennium Simulation, we combine luminosity gap with luminosity segregation (the brightest galaxy offset from the group luminosity centroid) to identify the most dynamically relaxed galaxy groups which allows us to reveal brand new observational connections between galaxies and their environments. View Full-Text
Keywords: galaxies; galaxy groups; galaxy formation and evolution galaxies; galaxy groups; galaxy formation and evolution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Khosroshahi, H.G.; Miraghaei, H.; Raouf, M. Fossil Systems; a Multi-wavelength Approach towards Understanding Galaxy Formation. Galaxies 2016, 4, 5.

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