Optical spectroscopic followup of serendipitous Chandra sources: The Chandra multiwavelength project (ChaMP)

J. Silverman, P. Green, B. Wilkes, C. Foltz, P. Smith, C. Smith, Dong Woo Kim, D. Morris, A. Mossman, R. Cameron, K. Adelberger

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A primary goal of the Chandra Multiwavelength Project (ChaMP) is to investigate the evolution of Active Galactic Nuclei (AGN) and quasars by measuring the luminosity function out to z ≥ 4 including obscured AGN that have been missed by previous surveys. To do so, we are acquiring spectra of optical counterparts to serendipitious X-ray sources detected by Chandra for classification and redshift determination. We have amassed about 200 spectra using the FLWO 1.5m, WIYN 3.5m, CTIO/4m, Magellan and the MMT 6.5m. We have classified the majority of optical counterparts as 65% broad line AGN, 14% narrow emission line galaxies and 12% absorption line galaxies. The remaining counterparts are either stars (8%) or galaxy clusters (1%). We have acquired a sample of 120 AGN in 12 Chandra fields. With a limiting magnitude of r′ = 22 for spectroscopic followup, we are able to detect quasars out to z ∼ 5 and galaxies out to z ∼ 0.7. This preliminary sample forms the foundation for our measurement of the X-ray luminosity function of AGNs out to z ∼ 4.

Original languageEnglish (US)
Pages (from-to)97-100
Number of pages4
JournalAstronomische Nachrichten
Volume324
Issue number1-2
DOIs
StatePublished - 2003
Externally publishedYes

Keywords

  • Surveys
  • X-rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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