Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20921510y&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #215.10; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
The SDSS spectroscopic survey database (hereby, SDSS) provide a means to measure the 3-dimensional spatial densities for bright galaxies. This is in principle very useful to identify galaxy clusters. However, due to the currently-severe level of incompleteness of SDSS limits its usefulness. It is not rare to find galaxies in apparently-dense environment yet yielding low 3-d density measures. We demonstrate a classic example, Abell 2670. We attempt to recover the true densities by using additional information from photometric data, that is, by finding candidate member galaxies via color-magnitude relation and photometric redshift techniques. The newly-derived 2-dimensional densities are more consistent with apparent environmental information and with independent X-ray data.
We demonstrate the procedure using our latest CTIO/Hydra data on Abell 2670 and Abell 3330. Based on the result, we provide a correction formula to the 3-d density measures solely based on the SDSS spectroscopic data. We present some preliminary results from our scientific investigations, for example, on the radial variation of star formation history within clusters.
Lee Young-Wook
REE Chang Hee
Schawinski Kevin
Sheen Yun-Kyeong
Yi Kyung--Soo
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