IPAC

Home

NASA/IPAC Extragalactic Database

  • Home
  • Search Objects
    • By Name
    • Near Name or Position (Cone)
    • In Refcode
    • By Parameters
  • Literature
    • References by Author Name
    • Reference Lookup
    • Nomenclature
  • Services
    • Gravitational Wave Followup
      • Overview
      • Events
    • Ticket Status
    • Level5
      • Knowledge Base
      • Glossary
    • Classic Home Page
  • Tools
    • Coordinate Calculator
    • Extinction Calculator
    • Velocity Calculator
  • Information
    • Overview
      • News
      • Archived Release Notes
    • User Guides
      • Search Objects
      • Calculators
      • Program Interfaces
      • Database
      • Tutorials
      • Best Practices
      • Search & Retrieval FAQ
      • Scientific Calculations FAQ
      • Known Issues
      • Discontinuing Services
    • Holdings
      • Nomenclature
      • Counts
      • Graphics
      • Data Sets
    • References
      • Articles about NED
      • Brochure (pdf)
      • Cosmology Calculators
      • Extinction-Law Calculators
      • Related Sites
    • Community
      • Users Committee
      • Ambassadors
    • Team
    • Contact Us

You are here

Home » Literature » Reference Lookup

Help Reference Information

TitleCHANDRA ACIS Survey of X-Ray Point Sources: The Source Catalog
AuthorsWang, Song; Liu, Jifeng; Qiu, Yanli; Bai, Yu; Yang, Huiqin; Guo, Jincheng; Zhang, Peng
Bibcode

2016ApJS..224...40W   Search ADS ↗

AbstractThe Chandra archival data is a valuable resource for various studies on different X-ray astronomy topics. In this paper, we utilize this wealth of information and present a uniformly processed data set, which can be used to address a wide range of scientific questions. The data analysis procedures are applied to 10,029 Advanced CCD Imaging Spectrometer observations, which produces 363,530 source detections belonging to 217,828 distinct X-ray sources. This number is twice the size of the Chandra Source Catalog (Version 1.1). The catalogs in this paper provide abundant estimates of the detected X-ray source properties, including source positions, counts, colors, fluxes, luminosities, variability statistics, etc. Cross-correlation of these objects with galaxies shows that 17,828 sources are located within the D 25 isophotes of 1110 galaxies, and 7504 sources are located between the D 25 and 2D 25 isophotes of 910 galaxies. Contamination analysis with the log N-log S relation indicates that 51.3% of objects within 2D 25 isophotes are truly relevant to galaxies, and the “net” source fraction increases to 58.9%, 67.3%, and 69.1% for sources with luminosities above 1037, 1038, and 1039 erg s-1, respectively. Among the possible scientific uses of this catalog, we discuss the possibility of studying intra-observation variability, inter-observation variability, and supersoft sources (SSSs). About 17,092 detected sources above 10 counts are classified as variable in individual observation with the Kolmogorov-Smirnov (K-S) criterion (P K-S < 0.01). There are 99,647 sources observed more than once and 11,843 sources observed 10 times or more, offering us a wealth of data with which to explore the long-term variability. There are 1638 individual objects (̃2350 detections) classified as SSSs. As a quite interesting subclass, detailed studies on X-ray spectra and optical spectroscopic follow-up are needed to categorize these SSSs and pinpoint their properties. In addition, this survey can enable a wide range of statistical studies, such as X-ray activity in different types of stars, X-ray luminosity functions in different types of galaxies, and multi-wavelength identification and classification of different X-ray populations.
Objects

217796 Objects    Search NED ↙

Reload form

The NASA/IPAC Extragalactic Database (NED) is funded by the
National Aeronautics and Space Administration under
Award Number 80NSSC21M0037, and operated by the California Institute of Technology.

  • IPAC
  • Caltech
  • NASA
  • About NED
  • Acknowledging NED
  • Connect with NED:
    • EMail
    • facebook
    • youtube
Copyright © 2025, California Institute of Technology
back up ↑