The Open UniversitySkip to content

An optical source catalog of the north ecliptic pole region

Hwang, Narae; Lee, Myung; Lee, Hyung Mok; Im, Myungshin; Kim, Taehyun; Matsuhara, Hideo; Wada, Takehiko; Oyabu, Shinki; Pak, Soojong; Chun, Moo-Young; Watarai, Hidenori; Nakagawa, Takao; Pearson, Chris; Takagi, Toshinobu; Hanami, Hitoshi and White, Glenn J. (2007). An optical source catalog of the north ecliptic pole region. Astrophysical Journal Supplement Series, 172(2) pp. 583–598.

DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


We present a five-band (u(*), g', r', i', z') optical photometry catalog of the sources in the north ecliptic pole (NEP) region based on deep observations made with MegaCam at CFHT. The source catalog covers about 2 square degree area centered at the NEP and reaches depths of about 26 mag for u*, g', r' bands, about 25 mag for i' band, and about 24 mag for z' band (4 sigma detection over a 100 aperture). The total number of cataloged sources brighter than r' 23 mag is about 56,000 including both point sources and extended sources. From the investigation of photometric properties using the color-magnitude diagrams and color-color diagrams, we have found that the colors of extended sources are mostly (u*- r') < 3: 0 and (g'- z') > 0.5. This can be used to separate the extended sources from the point sources reliably, even for the faint source domain where typical morphological classification schemes hardly work efficiently. We have derived an empirical color-redshift relation of the red sequence galaxies using the Sloan Digital Sky Survey data. By applying this relation to our photometry catalog and searching for any spatial overdensities, we have found two galaxy clusters and one nearby galaxy group.

Item Type: Journal Item
ISSN: 1538-4357
Keywords: Catalogues; Galaxies; Clusters; Photometry
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 15616
Depositing User: Colin Smith
Date Deposited: 27 Apr 2009 09:52
Last Modified: 02 May 2018 12:59
Share this page:


Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU