R
R. Williams
Researcher at Uber
Publications - 18
Citations - 2215
R. Williams is an academic researcher from Uber . The author has contributed to research in topics: Galaxy & Redshift. The author has an hindex of 10, co-authored 18 publications receiving 2139 citations. Previous affiliations of R. Williams include California Institute of Technology & Carnegie Learning.
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Journal ArticleDOI
67 Additional L Dwarfs Discovered by the Two Micron All Sky Survey
J. Davy Kirkpatrick,I. Neill Reid,James Liebert,John E. Gizis,Adam J. Burgasser,David G. Monet,Conard C. Dahn,Brant O. Nelson,R. Williams +8 more
TL;DR: In this article, photometry, far red spectra, and spectral classifications for an additional 67 L dwarfs discovered by the Two Micron All Sky Survey are presented, and a table of all known L and T dwarfs believed to lie within 25 pc of the Sun.
Journal ArticleDOI
New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
John E. Gizis,John E. Gizis,David G. Monet,I. Neill Reid,J. Davy Kirkpatrick,James Liebert,R. Williams +6 more
TL;DR: In this paper, the authors combined 2MASS and POSS II data in a search for nearby ultracool (later than M6.5) dwarfs with Ks 6 A) consistent with an ordinary old disk stellar population.
Journal ArticleDOI
THE NUMBER DENSITY AND MASS DENSITY OF STAR-FORMING AND QUIESCENT GALAXIES AT 0.4 ⩽ z ⩽ 2.2
Gabriel B. Brammer,Gabriel B. Brammer,Gabriel B. Brammer,Katherine E. Whitaker,P. G. van Dokkum,Danilo Marchesini,M. Franx,Mariska Kriek,Mariska Kriek,Ivo Labbé,Kyoung-Soo Lee,Adam Muzzin,Ryan Quadri,G. Rudnick,R. Williams +14 more
TL;DR: In this article, the authors study the buildup of the bimodal galaxy population using the NEWFIRM Medium-Band Survey, which provides excellent redshifts and well-sampled spectral energy distributions of {approx}27, 000 galaxies with K 3 x 10{sup 10} M{sub sun} increases by a factor of {approximately}10 from z − 2 to the present day, whereas the mass density in star-forming galaxies is flat or decreases over the same time period.
Journal ArticleDOI
New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
TL;DR: In this paper, the authors combined 2MASS and POSS II data in a search for nearby ultracool (later than M6.5) dwarfs with K_s 6 Angstroms.
Journal ArticleDOI
THE EVOLUTION OF THE MASS-SIZE RELATION TO z = 3.5 FOR UV-BRIGHT GALAXIES AND SUBMILLIMETER GALAXIES IN THE GOODS-NORTH FIELD
TL;DR: In this paper, the evolution of the size-stellar mass relation for a large spectroscopic sample of galaxies in the GOODS-North field up to z {approx} 3.5 was studied.