Spatial variations of galaxy number counts in the Sloan Digital Sky Survey. I. Extinction, large-scale structure, and photometric homogeneity

Masataka Fukugita, Naoki Yasuda, Jon Brinkmann, James E. Gunn, Zeljko Ivezić, Gillian R. Knapp, Robert Lupton, Donald P. Schneider

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

We study the spatial variation of galaxy number counts using five-band photometric images from the Sloan Digital Sky Survey (SDSS). The spatial variation of this sample of 4.3 million galaxies collected from 2200 deg 2 can be understood as the combination of Galactic extinction and large-scale clustering. With the use of the reddening map of Schlegel, Finkbeiner, & Davis, the standard extinction law is verified for the color bands from u to z within 5% in the region of small extinction values, E(B-V) < 0.15. The residual spatial variation of the number counts suggests that the error in the global calibration for SDSS photometry is smaller than 0.02 mag.

Original languageEnglish (US)
Pages (from-to)3155-3160
Number of pages6
JournalAstronomical Journal
Volume127
Issue number6 1782
DOIs
StatePublished - Jun 2004

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Spatial variations of galaxy number counts in the Sloan Digital Sky Survey. I. Extinction, large-scale structure, and photometric homogeneity'. Together they form a unique fingerprint.

  • Cite this