2019/07/22 by M. D’Onofrio, C. Chiosi, D'Onofrio, Mauro +5
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Scientific Research and Discoveries #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.1907.09367
openalex publication_date 2019/07/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Context. This is the second work dedicated to the observed parallelism\nbetween galaxy clusters and early-type galaxies. The focus is on the\ndistribution of these systems in the scaling relations (SRs) observed when\neffective radii, effective surface brightness, total luminosities and velocity\ndispersions are mutually correlated. Aims. Using the data of the Illustris\nsimulation we try to speculate on the origin of the observed SRs. Methods. We\ncompare the observational SRs extracted from the database of the WIde-field\nNearby Galaxy-cluster Survey (WINGS) with the relevant parameters coming from\nthe Illustris simulations. Then we use the simulated data at different redshift\nto infer the evolution of the SRs. Results. The comparison demonstrate that\ngalaxy clusters (GCs) at z~0 follow the same log(L)-log(sigma) relation of\nearly-type galaxies (ETGs) and that both in the log(Ie)-log(Re) and\nlog(Re)-log(M*) planes the distribution of GCs is along the sequence defined by\nthe brightest and massive early-type galaxies (BCGs). The Illustris simulation\nreproduces the tails of the massive galaxies visible both in the\nlog(Ie)-log(Re) and log(Re)-log(M*) planes, but fail to give the correct\nestimate of the effective radii of the dwarf galaxies that appear too large and\nthose of GCs that are too small. The evolution of the SRs up to z=4 permits to\nreveal the complex evolutionary paths of galaxies in the SRs and indicate that\nthe line marking the Zone of Exclusion (ZoE), visible both in the\nlog(Ie)-log(Re) and log(Re)-log(M*) planes, is the trend followed by virialized\nand passively evolving systems. Conclusions. We speculate that the observed SRs\noriginate from the intersection of the virial theorem and a relation L=L0 x\nsigmabeta where the luminosities depend on the star formation history.\n