[ { "id": "authors:cjq2q-3pv93", "collection": "authors", "collection_id": "cjq2q-3pv93", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150710-075838062", "type": "book_section", "title": "The Space Density Evolution of Wet and Dry Mergers in the Canada-France-Hawaii Telescope Legacy Survey", "book_title": "Galaxy Mergers in an Evolving Universe", "author": [ { "family_name": "Chou", "given_name": "Richard C. Y.", "clpid": "Chou-Richard-C-Y" }, { "family_name": "Bridge", "given_name": "Carrie R.", "clpid": "Bridge-C-R" }, { "family_name": "Abraham", "given_name": "Roberto G.", "orcid": "0000-0002-4542-921X", "clpid": "Abraham-R-G" } ], "contributor": [ { "family_name": "Sun", "given_name": "Wei-Hsin", "clpid": "Sun-Wei-Hsin" }, { "family_name": "Xu", "given_name": "C. Kevin", "clpid": "Xu-C-Kevin" }, { "family_name": "Scoville", "given_name": "Nick Z.", "clpid": "Scoville-N-Z" }, { "family_name": "Sanders", "given_name": "David B.", "clpid": "Sanders-D-B" } ], "abstract": "We analyze 1298 merging galaxies with redshifts up to z = 0.7 from the Canada-France-Hawaii Telescope Legacy Survey, taken from the catalog presented in Bridge et al. (2010). By analyzing the internal colors of these systems, we show that so-called wet and dry mergers evolve in different senses, and quantify the space densities of these systems. The local space density of wet mergers is essentially identical to the local space density of dry mergers. The evolution in the total merger rate is modest out to z \u223c 0.7, although the wet and dry populations have different evolutionary trends. At higher redshifts dry mergers make a smaller contribution to the total merging galaxy population, but this is offset by a roughly equivalent increase in the contribution from wet mergers. By comparing the mass density function of early-type galaxies to the corresponding mass density function for merging systems, we show that not all the major mergers with the highest masses (M_(stellar) > 10^(11)M\u2609) will end up with the most massive early-type galaxies, unless the merging timescale is dramatically longer than that usually assumed. On the other hand, the usually-assumed merging timescale of \u223c 0.5\u20131 Gyr is quite consistent with the data if we suppose that only less massive early-type galaxies form via mergers. Since low-intermediate mass ellipticals are 10\u2013100 times more common than their most massive counterparts, the hierarchical explanation for the origin of early-type galaxies may be correct for the vast majority of early-types, even if incorrect for the most massive ones.", "isbn": "978-1-58381-838-1", "publisher": "Astronomical Society of the Pacific", "place_of_publication": "San Francisco, CA", "publication_date": "2013", "pages": "145-153" }, { "id": "authors:vq6zj-h0b61", "collection": "authors", "collection_id": "vq6zj-h0b61", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140130-094336118", "type": "book_section", "title": "WISE Discovery of Hyper Luminous Galaxies at z = 2-4 and Their Implications for Galaxy and AGN Evolution", "book_title": "Galaxy Mergers in an Evolving Universe", "author": [ { "family_name": "Tsai", "given_name": "Chao-Wei", "orcid": "0000-0002-9390-9672", "clpid": "Tsai-Chao-Wei" }, { "family_name": "Einsenhardt", "given_name": "Peter R. M.", "clpid": "Einsenhardt-P-R-M" }, { "family_name": "Wu", "given_name": "Jingwen", "orcid": "0000-0001-7808-3756", "clpid": "Wu-Jingwen" }, { "family_name": "Bridge", "given_name": "Carrie", "clpid": "Bridge-C-R" }, { "family_name": "Assef", "given_name": "Roberto", "orcid": "0000-0002-9508-3667", "clpid": "Assef-R-J" }, { "family_name": "Benford", "given_name": "Dominic", "orcid": "0000-0002-9884-4206", "clpid": "Benford-D-J" }, { "family_name": "Blain", "given_name": "Andrew", "orcid": "0000-0001-7489-5167", "clpid": "Blain-A-W" }, { "family_name": "Cutri", "given_name": "Roc", "orcid": "0000-0002-0077-2305", "clpid": "Cutri-R-M" }, { "family_name": "Griffith", "given_name": "Roger L.", "clpid": "Griffith-R-L" }, { "family_name": "Jarrett", "given_name": "Thomas", "orcid": "0000-0002-4939-734X", "clpid": "Jarrett-T-H" }, { "family_name": "Lonsdale", "given_name": "Carol", "orcid": "0000-0003-0898-406X", "clpid": "Lonsdale-Carol-J" }, { "family_name": "Petty", "given_name": "Sara", "orcid": "0000-0003-0624-3276", "clpid": "Petty-Sara-M" }, { "family_name": "Sayers", "given_name": "Jack", "orcid": "0000-0002-8213-3784", "clpid": "Sayers-Jack" }, { "family_name": "Stanford", "given_name": "Adam", "clpid": "Stanford-Adam" }, { "family_name": "Stern", "given_name": "Daniel", "orcid": "0000-0003-2686-9241", "clpid": "Stern-D" }, { "family_name": "Wright", "given_name": "Edward L.", "orcid": "0000-0001-5058-1593", "clpid": "Wright-E-L" }, { "family_name": "Yan", "given_name": "Lin", "orcid": "0000-0003-1710-9339", "clpid": "Yan-Lin" } ], "contributor": [ { "family_name": "Sun", "given_name": "Wei-Hsin", "clpid": "Sun-Wei-Hsin" }, { "family_name": "Xu", "given_name": "C. Kevin", "clpid": "Xu-C-Kevin" }, { "family_name": "Scoville", "given_name": "Nick Z.", "clpid": "Scoville-N-Z" }, { "family_name": "Sanders", "given_name": "David B.", "clpid": "Sanders-D-B" } ], "abstract": "On behalf of the WISE Science team, we present the discovery of a class of distant dust-enshrouded galaxies with extremely high luminosity. These galaxies are selected to have extreme red colors in the mid-IR using NASA's Wide-field Infrared Survey Explorer (WISE). They are faint in the optical and near-IR, predominantly at z=2-4, and with IR luminosity > 10^(13)L_\u2609, making them Hyper-Luminous Infrared Galaxies (HyLIRGs). SEDs incorporating the WISE, Spitzer, and Herschel PACS and SPIRE photometry indicate hot dust dominates the bolometric luminosity, presumably powered by AGN. Preliminary multi-wavelength follow-up suggests that they are different from normal populations in the local M-sigma relation. Their low source density implies that these objects are either intrinsically rare, or a short-lived phase in a more numerous population. If the latter is the case, these hot, dust-enshrouded galaxies may be an early stage in the interplay between AGN and galaxies.", "doi": "10.48550/arXiv.1311.0120", "isbn": "978-1-58381-838-1", "publisher": "Astronomical Society of the Pacific", "place_of_publication": "San Francisco, CA", "publication_date": "2011-10", "pages": "247-250" } ]