The DEEP2 Galaxy Redshift Survey: Design, Observations, Data Reduction, and Redshifts

We describe the design and data sample from the DEEP2 Galaxy Redshift Survey, the densest and largest precision-redshift survey of galaxies at z ~ 1 completed to date. The survey has conducted a comprehensive census of massive galaxies, their properties, environments, and large-scale structure down to absolute magnitude M_B = -20 at z ~ 1 via ~90 nights of observation on the DEIMOS spectrograph at Keck Observatory. DEEP2 covers an area of 2.8 deg^2 divided into four separate fields, observed to a limiting apparent magnitude of R_AB=24.1. Objects with z < 0.7 are rejected based on BRI photometry in three of the four DEEP2 fields, allowing galaxies with z > 0.7 to be targeted ~2.5 times more efficiently than in a purely magnitude-limited sample. Approximately sixty percent of eligible targets are chosen for spectroscopy, yielding nearly 53,000 spectra and more than 38,000 reliable redshift measurements. Most of the targets which fail to yield secure redshifts are blue objects that lie beyond z ~ 1.45. The DEIMOS 1200-line/mm grating used for the survey delivers high spectral resolution (R~6000), accurate and secure redshifts, and unique internal kinematic information. Extensive ancillary data are available in the DEEP2 fields, particularly in the Extended Groth Strip, which has evolved into one of the richest multiwavelength regions on the sky. DEEP2 surpasses other deep precision-redshift surveys at z ~ 1 in terms of galaxy numbers, redshift accuracy, sample number density, and amount of spectral information. We also provide an overview of the scientific highlights of the DEEP2 survey thus far. This paper is intended as a handbook for users of the DEEP2 Data Release 4, which includes all DEEP2 spectra and redshifts, as well as for the publicly-available DEEP2 DEIMOS data reduction pipelines. [Abridged]Comment: submitted to ApJS; data products available for download at http://deep.berkeley.edu/DR4

El fin de la presunción hegemónica

The Senate Intelligence Subcommittee's Report on Chile illuminates the contours of recent US-Latin American relations. With impressive detail and contained force, the Report does not limit itself to documenting what the US did in Chile until 1973; it also exemplifies the hegemonic concept on which this country has based its policy towards Latin America and the Caribbean. But the days of unchallenged US control over the Western Hemisphere are numbered. The historic "special relations" between the US and Latin America are coming to an end. A new approach to hemispheric relations is necessary. The trends in Latin America and elsewhere, however, are rapidly disintegrating the foundations of the hegemonic concept of the United States, which ten years ago seemed safe from any challenge.El informe sobre Chile del Subcomité Restringido de Inteligencia del Senado ilumina los contornos de las relaciones recientes entre los EE.UU. y Latinoamérica. Con detalles impresionantes y contenida fuerza, el Informe no se limita a documentar lo que los EE.UU. hicieron en Chile hasta 1973; también ejemplifica el concepto hegemónico en el que este país ha basado su política hacia Latinoamérica y el Caribe. Pero los días del control indiscutido de los EE.UU. sobre el Hemisferio Occidental están contados. Las "relaciones especiales" históricas entre los EE.UU. y Latinoamérica están llegando a su fin. Se hace necesario un nuevo enfoque de las relaciones hemisféricas. Las tendencias que se observan en Latinoamérica y en otros lugares, sin embargo, están disgregando con rapidez las bases del concepto hegemónico de Estados Unidos que diez años atrás parecía a salvo de cualquier desafío