Galaxy Clustering in Early Sloan Digital Sky Survey Redshift Data
العنوان: | Galaxy Clustering in Early Sloan Digital Sky Survey Redshift Data |
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المؤلفون: | Mark SubbaRao, Douglas Tucker, Idit Zehavi, Avery Meiksin, Albert Stebbins, Julianne Dalcanton, Jon Loveday, Francisco Javier Castander, Peter Kunszt, David Schlegel, Scott Dodelson, Istvan Csabai, Alexander Szalay, Gillian Knapp, Houjun Mo, Istvan Szapudi |
المصدر: | The Astrophysical Journal. 571:172-190 |
بيانات النشر: | American Astronomical Society, 2002. |
سنة النشر: | 2002 |
مصطلحات موضوعية: | Physics, Absolute magnitude, 010308 nuclear & particles physics, Velocity dispersion, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Redshift survey, 01 natural sciences, Galaxy, Redshift, Luminosity, Correlation function (statistical mechanics), Space and Planetary Science, 0103 physical sciences, Surface brightness, 010303 astronomy & astrophysics |
الوصف: | We present the first measurements of clustering in the Sloan Digital Sky Survey (SDSS) galaxy redshift survey. Our sample consists of 29,300 galaxies with redshifts 5,700 km/s < cz < 39,000 km/s, distributed in several long but narrow (2.5-5 degree) segments, covering 690 square degrees. For the full, flux-limited sample, the redshift-space correlation length is approximately 8 Mpc/h. The two-dimensional correlation function \xi(r_p,\pi) shows clear signatures of both the small-scale, ``fingers-of-God'' distortion caused by velocity dispersions in collapsed objects and the large-scale compression caused by coherent flows, though the latter cannot be measured with high precision in the present sample. The inferred real-space correlation function is well described by a power law, \xi(r)=(r/6.1+/-0.2 Mpc/h)^{-1.75+/-0.03}, for 0.1 Mpc/h < r < 16 Mpc/h. The galaxy pairwise velocity dispersion is \sigma_{12} ~ 600+/-100 km/s for projected separations 0.15 Mpc/h < r_p < 5 Mpc/h. When we divide the sample by color, the red galaxies exhibit a stronger and steeper real-space correlation function and a higher pairwise velocity dispersion than do the blue galaxies. The relative behavior of subsamples defined by high/low profile concentration or high/low surface brightness is qualitatively similar to that of the red/blue subsamples. Our most striking result is a clear measurement of scale-independent luminosity bias at r < 10 Mpc/h: subsamples with absolute magnitude ranges centered on M_*-1.5, M_*, and M_*+1.5 have real-space correlation functions that are parallel power laws of slope ~ -1.8 with correlation lengths of approximately 7.4 Mpc/h, 6.3 Mpc/h, and 4.7 Mpc/h, respectively. |
تدمد: | 1538-4357 0004-637X |
URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::bae2f167b4ca10103c6f732f47d84a74 https://doi.org/10.1086/339893 |
حقوق: | OPEN |
رقم الأكسشن: | edsair.doi...........bae2f167b4ca10103c6f732f47d84a74 |
قاعدة البيانات: | OpenAIRE |
تدمد: | 15384357 0004637X |
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