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

doi:10.1086/420800

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

Astrophysical Sciences

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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 language	English (US)
Pages (from-to)	3155-3160
Number of pages	6
Journal	Astronomical Journal
Volume	127
Issue number	6 1782
DOIs	https://doi.org/10.1086/420800
State	Published - Jun 2004

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Dust, extinction
Large-scale structure of universe
Techniques: photometric

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10.1086/420800

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

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.",

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T1 - Spatial variations of galaxy number counts in the Sloan Digital Sky Survey. I. Extinction, large-scale structure, and photometric homogeneity

AU - Fukugita, Masataka

AU - Yasuda, Naoki

AU - Brinkmann, Jon

AU - Gunn, James E.

AU - Ivezić, Zeljko

AU - Knapp, Gillian R.

AU - Lupton, Robert

AU - Schneider, Donald P.

PY - 2004/6

Y1 - 2004/6

N2 - 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.

AB - 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.

KW - Dust, extinction

KW - Large-scale structure of universe

KW - Techniques: photometric

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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