Naslov
The Second Data Release of the Sloan Digital Sky Survey

Autori
Abazajian, Kevork ; Adelman-McCarthy, Jennifer K. ; Agueros, Marcel A. ; Smolčić, Vernesa

Izvornik
Astronomical journal (0004-6256) 128 (2004), 1; 502-512

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
atlases; catalogs; surveys

Sažetak
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg^2 of five-band (ugriz) imaging data with photometry for over 88 million unique objects, 367, 360 spectra of galaxies, quasars, stars, and calibrating blank sky patches selected over 2627 deg^2 of this area, and tables of measured parameters from these data. The imaging data reach of r ~ 22.2 (95% complteness limit for point sources) and are photometrically and astrometrically calibrated to 2% rms and 100 mas rms per coordinate, respectively. The imaging data have all been processed through a new version of the SDSS imaging pipeline, in which the most important improvement since the last data release is fixing an error in the model fits to each object. The result is that model magnitudes are noa a good proxy for point spread function magnitudes for point sources, and Petrosian magnitudes for extended sources. The spectrsocpic software now repairs a systematic error in the radial velocities of certain types of stars and has substantially improved spectrophotometry. All data included in the SDSS Early Data Release and First Data Release are reporcessed with the improved pipelines and included in the Second Data Release. Further characteristics of the data are described, as are the data products themselves and the tools for accessing them.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA