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J/ApJ/703/2160             The OPTX project. III.              (Trouille+, 2009)

The OPTX project. III. X-ray versus optical spectral type for active galactic nuclei. Trouille L., Barger A.J., Cowie L.L., Yang Y., Mushotzky R.F. <Astrophys. J., 703, 2160-2170 (2009)> =2009ApJ...703.2160T
ADC_Keywords: X-ray sources ; Surveys ; Redshifts ; Active gal. nuclei Keywords: cosmology: observations - galaxies: active Abstract: We compare the optical spectral types with the X-ray spectral properties for a uniformly selected (sources with fluxes greater than the 3σ level and above a flux limit of f(2-8keV)>3.5x10-15erg/cm2/s), highly spectroscopically complete (>80% for f(2-8keV)>10-14erg/cm2/s and >60% below) 2-8keV X-ray sample observed in three Chandra fields (CLANS, CLASXS, and the CDF-N) that cover ∼1.2deg2. For our sample of 645 spectroscopically observed sources, we confirm that there is significant overlap of the X-ray spectral properties, as determined by the effective photon indices, Γeff, obtained from the ratios of the 0.5-2keV to 2-8keV counts, for the different optical spectral types. Thus, one cannot use the X-ray spectral classifications and the optical spectral classifications equivalently. Since it is not understood how X-ray and optical classifications relate to the obscuration of the central engine, we strongly advise against a mixed classification scheme, as it can only complicate the interpretation of X-ray AGN samples. Description: Trouille et al. (2008, Cat. J/ApJS/179/1) present the details of our spectroscopic observations of the X-ray sources in the CLANS, CLASXS, and CDF-N fields, including how the observations were made, the data reduction process, and the latest redshift catalogs. We provide a catalog of only updated values for the CLANS field. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 120 53 CLANS (Chandra Lockman Area North Survey) catalog, updated sources
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) J/ApJS/179/1 : The OPTX project: CLANS, CLASXS and CDF-N (Trouille+, 2008) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- CLANS Object identification (1) 5- 12 F8.4 deg RAdeg Right ascension in decimal degrees (J2000) 14- 20 F7.4 deg DEdeg Declination in decimal degrees (J2000) 22- 27 F6.2 ct Scts Net soft counts in the 0.5-2keV band 29- 33 F5.2 ct E_Scts 1sigma positive error in Scts (2) 35- 39 F5.2 ct e_Scts 1sigma negative error in Scts (2) 41- 46 F6.2 ct Hcts Net hard counts in the 2-8keV band 48- 52 F5.2 ct E_Hcts 1sigma positive error in Hcts (2) 54- 58 F5.2 ct e_Hcts 1sigma negative error in Hcts (2) 60- 64 F5.2 aW/m2 Fsoft X-ray flux in the 0.5-2keV in units of 10-15erg/cm2/s = 10-18W/m2 66- 69 F4.2 aW/m2 E_Fsoft 1sigma positive error in Fsoft (2) 71- 74 F4.2 aW/m2 e_Fsoft 1sigma negative error in Fsoft (2) 76- 80 F5.2 aW/m2 Fhard X-ray flux in the 2-8keV in units of 10-15erg/cm2/s = 10-18W/m2 82- 87 F6.2 aW/m2 E_Fhard 1sigma positive error in Fhard (2) 89- 93 F5.2 aW/m2 e_Fhard 1sigma negative error in Fhard (2) 95-100 F6.2 aW/m2 Ftot X-ray flux in the 0.5-8keV in units of 10-15erg/cm2/s = 10-18W/m2 102-105 F4.2 aW/m2 E_Ftot 1sigma positive error in Ftot (2) 107-110 F4.2 aW/m2 e_Ftot 1sigma negative error in Ftot (2) 112-116 F5.2 --- zsp ?=0 Spectroscopic redshift 118-120 I3 --- Class Optical spectral classification (3)
Note (1): We ordered the sources by increasing right ascension and labeled each with the same source number as in Trouille et al. (2008, Cat. J/ApJS/179/1). CLANS No. 761 through No. 789 were inadvertently not included in the original Trouille et al. (2008, Cat. J/ApJS/179/1) CLANS catalog and so are included here. CLANS Nos. 80, 150, and 404 in the Trouille et al. (2008, Cat. J/ApJS/179/1) catalog had incorrect 2-8keV fluxes as a result of their anomalously high HR values. Here, we list their corrected fluxes determined using the HEASARC WebPIMMS tool and assuming Γ=1.4. The remaining sources are included as a result of our spectroscopic observations with DEIMOS on Keck II in Spring 2009. Note (2): The errors quoted are the 1σ Poisson errors, using the approximations from Gehrels (1986ApJ...303..336G). The flux errors do not include the uncertainty in the flux conversion factor; however, the errors are generally dominated by the Poisson errors. Note (3): Class as follows: -99 = source spectroscopically observed but neither the redshift nor the class could be identified -1 = source not yet spectroscopically observed -2 = source is a star 0 = absorber; 1 = star former; 3 = high-excitation source; 4 = BLAGN (broad-line active galactic nucleus).
History: From electronic version of the journal References: Trouille et al. Paper I. 2008ApJS..179....1T Cat. J/ApJS/179/1 Yencho et al. Paper II. 2009ApJ...698..380Y Trouille & Barger Paper IV. 2010ApJ...722..212T
(End) Emmanuelle Perret [CDS] 03-Nov-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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