Optical spectroscopic followup of serendipitous Chandra sources: the Chandra Multiwavelength Project (ChaMP)
| Autor: | J. Silverman, P. Green, B. Wilkes, C. Foltz, P. Smith, C. Smith, Dong-Woo Kim, D. Morris, A. Mossman, R. Cameron, K. Adelberger, null The Champ Collaboration |
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| Rok vydání: | 2003 |
| Předmět: |
Physics
Active galactic nucleus Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Quasar Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Redshift Galaxy Stars Space and Planetary Science Emission spectrum Astrophysics::Galaxy Astrophysics Galaxy cluster Luminosity function (astronomy) |
| Zdroj: | Astronomische Nachrichten. 324:97-100 |
| ISSN: | 1521-3994 0004-6337 |
| DOI: | 10.1002/asna.200310025 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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