ar X iv : 1 21 2 . 56 41 v 1 [ as tr o - ph . C O ] 2 2 D ec 2 01 2 Galaxy Formation : Where Do We Stand ?
نویسنده
چکیده
This paper presents a review of the topic of galaxy formation and evolution, focusing on basic features of galaxies, and how these observables reveal how galaxies and their stars assemble over cosmic time. I give an overview of the observed properties of galaxies in the nearby universe and for those at higher redshifts up to z ∼ 10. This includes a discussion of the major processes in which galaxies assemble and how we can now observe these including the merger history of galaxies, the gas accretion and star formation rates. I show that for the most massive galaxies mergers and accretion are about equally important in the galaxy formation process between z = 1− 3, while this likely differs for lower mass systems. I also discuss the mass differential evolution for galaxies, as well as how environment can affect galaxy evolution, although mass is the primary criteria for driving evolution. I also discuss how we are beginning to measure the dark matter content of galaxies at different epochs as measured through kinematics and clustering. Finally, I review how observables of galaxies, and the observed galaxy formation process, compares with predictions from simulations of galaxy formation, finding significant discrepancies in the abundances of massive galaxies and the merger history. I conclude by examining prospects for the future using JWST, Euclid, SKA, and the ELTs in addressing outstanding issues.
منابع مشابه
ar X iv : 0 81 2 . 01 26 v 1 [ as tr o - ph ] 1 D ec 2 00 8 15 GHz VLBI detection of the HST - 1 feature in the M 87 jet
C.S. Chang∗,a,†, E. Rosa, Y. Y. Kovaleva,b,‡, M. L. Listerc aMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany bAstro Space Centre of Lebedev Physical Institute, Profsoyuznaya 84/32, 117997 Moscow, Russia cDepartment of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907, USA E-mail: [email protected], [email protected], [email protected], mlis...
متن کاملar X iv : 1 41 0 . 79 58 v 1 [ as tr o - ph . C O ] 2 9 O ct 2 01 4 Observing the Inflationary Reheating
Jérôme Martin, ∗ Christophe Ringeval, † and Vincent Vennin ‡ Institut d’Astrophysique de Paris, UMR 7095-CNRS, Université Pierre et Marie Curie, 98 bis boulevard Arago, 75014 Paris, France Centre for Cosmology, Particle Physics and Phenomenology, Institute of Mathematics and Physics, Louvain University, 2 Chemin du Cyclotron, 1348 Louvain-la-Neuve, Belgium Institute of Cosmology & Gravitation, ...
متن کاملar X iv : 1 11 1 . 70 11 v 2 [ as tr o - ph . I M ] 4 D ec 2 01 1 Optimal Multiwavelength Source Detection : Experience Gained from the WISE Mission
We discuss the optimal detection of point sources from multiwavelength imaging data using an approach, referred to as MDET, which requires no prior knowledge of the source spectrum. MDET may be regarded as a somewhat more general version of the so-called “chi squared” technique. We describe the theoretical basis of the technique, and show examples of its performance with four-channel infrared b...
متن کامل