Chandra X-ray sources in the LALA Cetus field

J. X. Wang, Z. Y. Zheng, S. Malhotra, S. L. Finkelstein, J. E. Rhoads, C. A. Norman, T. M. Heckman

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The 174 ks Chandra Advanced CCD Imaging Spectrometer exposure of the Large Area Lyman Alpha Survey (LALA) Cetus field is the second of the two deep Chandra images on LALA fields. In this paper we present the Chandra X-ray sources detected in the Cetus field, along with an analysis of X-ray source counts, stacked X-ray spectrum, and optical identifications, A total of 188 X-ray sources were detected: 174 in the 0.5-7.0 keV band, 154 in the 0.5-2.0 keV band, and 113 in the 2.0-7.0 keV band. The X-ray source counts were derived and compared with LALA field (172 ks exposure). Interestingly, we find consistent hard-band X-ray source density, but (36 ±12)% higher softband X-ray source density in Cetus field. The weighted stacked spectrum of the detected X-ray sources can be fitted by a power law with photon index T = 1.55. Based on the weighted stacked spectrum, we find that the resolved fraction of the X-ray background drops from (72 ± 1)% at 0.5-1.0 keV to (63 ±4)% at 6.0-8.0 keV. The unresolved spectrum can be fitted by a power law over the range 0.5-7 keV, with a photon index T = 1.22. We also present optical counterparts for 154 of the X-ray sources, down to a limiting magnitude of r′ = 25.9 (Vega), using a deep r′-band image obtained with the MMT.

Original languageEnglish (US)
Pages (from-to)765-775
Number of pages11
JournalAstrophysical Journal
Volume669
Issue number2
DOIs
StatePublished - Nov 10 2007

Fingerprint

field survey
x rays
power law
imaging spectrometers
photons
charge coupled devices
spectrometer

Keywords

  • Catalogs
  • Galaxies: active
  • Galaxies: high-redshift
  • X-rays: diffuse background
  • X-rays: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Wang, J. X., Zheng, Z. Y., Malhotra, S., Finkelstein, S. L., Rhoads, J. E., Norman, C. A., & Heckman, T. M. (2007). Chandra X-ray sources in the LALA Cetus field. Astrophysical Journal, 669(2), 765-775. https://doi.org/10.1086/521809

Chandra X-ray sources in the LALA Cetus field. / Wang, J. X.; Zheng, Z. Y.; Malhotra, S.; Finkelstein, S. L.; Rhoads, J. E.; Norman, C. A.; Heckman, T. M.

In: Astrophysical Journal, Vol. 669, No. 2, 10.11.2007, p. 765-775.

Research output: Contribution to journalArticle

Wang, JX, Zheng, ZY, Malhotra, S, Finkelstein, SL, Rhoads, JE, Norman, CA & Heckman, TM 2007, 'Chandra X-ray sources in the LALA Cetus field', Astrophysical Journal, vol. 669, no. 2, pp. 765-775. https://doi.org/10.1086/521809
Wang JX, Zheng ZY, Malhotra S, Finkelstein SL, Rhoads JE, Norman CA et al. Chandra X-ray sources in the LALA Cetus field. Astrophysical Journal. 2007 Nov 10;669(2):765-775. https://doi.org/10.1086/521809
Wang, J. X. ; Zheng, Z. Y. ; Malhotra, S. ; Finkelstein, S. L. ; Rhoads, J. E. ; Norman, C. A. ; Heckman, T. M. / Chandra X-ray sources in the LALA Cetus field. In: Astrophysical Journal. 2007 ; Vol. 669, No. 2. pp. 765-775.
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abstract = "The 174 ks Chandra Advanced CCD Imaging Spectrometer exposure of the Large Area Lyman Alpha Survey (LALA) Cetus field is the second of the two deep Chandra images on LALA fields. In this paper we present the Chandra X-ray sources detected in the Cetus field, along with an analysis of X-ray source counts, stacked X-ray spectrum, and optical identifications, A total of 188 X-ray sources were detected: 174 in the 0.5-7.0 keV band, 154 in the 0.5-2.0 keV band, and 113 in the 2.0-7.0 keV band. The X-ray source counts were derived and compared with LALA field (172 ks exposure). Interestingly, we find consistent hard-band X-ray source density, but (36 ±12){\%} higher softband X-ray source density in Cetus field. The weighted stacked spectrum of the detected X-ray sources can be fitted by a power law with photon index T = 1.55. Based on the weighted stacked spectrum, we find that the resolved fraction of the X-ray background drops from (72 ± 1){\%} at 0.5-1.0 keV to (63 ±4){\%} at 6.0-8.0 keV. The unresolved spectrum can be fitted by a power law over the range 0.5-7 keV, with a photon index T = 1.22. We also present optical counterparts for 154 of the X-ray sources, down to a limiting magnitude of r′ = 25.9 (Vega), using a deep r′-band image obtained with the MMT.",
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AU - Zheng, Z. Y.

AU - Malhotra, S.

AU - Finkelstein, S. L.

AU - Rhoads, J. E.

AU - Norman, C. A.

AU - Heckman, T. M.

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N2 - The 174 ks Chandra Advanced CCD Imaging Spectrometer exposure of the Large Area Lyman Alpha Survey (LALA) Cetus field is the second of the two deep Chandra images on LALA fields. In this paper we present the Chandra X-ray sources detected in the Cetus field, along with an analysis of X-ray source counts, stacked X-ray spectrum, and optical identifications, A total of 188 X-ray sources were detected: 174 in the 0.5-7.0 keV band, 154 in the 0.5-2.0 keV band, and 113 in the 2.0-7.0 keV band. The X-ray source counts were derived and compared with LALA field (172 ks exposure). Interestingly, we find consistent hard-band X-ray source density, but (36 ±12)% higher softband X-ray source density in Cetus field. The weighted stacked spectrum of the detected X-ray sources can be fitted by a power law with photon index T = 1.55. Based on the weighted stacked spectrum, we find that the resolved fraction of the X-ray background drops from (72 ± 1)% at 0.5-1.0 keV to (63 ±4)% at 6.0-8.0 keV. The unresolved spectrum can be fitted by a power law over the range 0.5-7 keV, with a photon index T = 1.22. We also present optical counterparts for 154 of the X-ray sources, down to a limiting magnitude of r′ = 25.9 (Vega), using a deep r′-band image obtained with the MMT.

AB - The 174 ks Chandra Advanced CCD Imaging Spectrometer exposure of the Large Area Lyman Alpha Survey (LALA) Cetus field is the second of the two deep Chandra images on LALA fields. In this paper we present the Chandra X-ray sources detected in the Cetus field, along with an analysis of X-ray source counts, stacked X-ray spectrum, and optical identifications, A total of 188 X-ray sources were detected: 174 in the 0.5-7.0 keV band, 154 in the 0.5-2.0 keV band, and 113 in the 2.0-7.0 keV band. The X-ray source counts were derived and compared with LALA field (172 ks exposure). Interestingly, we find consistent hard-band X-ray source density, but (36 ±12)% higher softband X-ray source density in Cetus field. The weighted stacked spectrum of the detected X-ray sources can be fitted by a power law with photon index T = 1.55. Based on the weighted stacked spectrum, we find that the resolved fraction of the X-ray background drops from (72 ± 1)% at 0.5-1.0 keV to (63 ±4)% at 6.0-8.0 keV. The unresolved spectrum can be fitted by a power law over the range 0.5-7 keV, with a photon index T = 1.22. We also present optical counterparts for 154 of the X-ray sources, down to a limiting magnitude of r′ = 25.9 (Vega), using a deep r′-band image obtained with the MMT.

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KW - Galaxies: high-redshift

KW - X-rays: diffuse background

KW - X-rays: galaxies

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