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J/ApJ/705/1336   X-ray measurements of ChaMP-SDSS galaxies   (Constantin+, 2009)

Probing the balance of AGN and star-forming activity in the local universe with ChaMP. Constantin A., Green P., Aldcroft T., Kim D.-W., Haggard D., Barkhouse W., Anderson S.F. <Astrophys. J., 705, 1336-1355 (2009)> =2009ApJ...705.1336C
ADC_Keywords: Galaxies, nearby ; X-ray sources ; Active gal. nuclei ; Surveys Keywords: galaxies: active - galaxies: evolution - galaxies: nuclei - surveys - X-rays: galaxies Abstract: The combination of the Sloan Digital Sky Survey (SDSS) and the Chandra Multiwavelength Project (ChaMP; Green et al. 2004ApJS..150...43G) currently offers the largest and most homogeneously selected sample of nearby galaxies for investigating the relation between X-ray nuclear emission, nebular line emission, black hole masses, and properties of the associated stellar populations. We provide X-ray spectral fits and valid uncertainties for all the galaxies with counts ranging from 2 to 1325 (mean 76, median 19). We present here novel constraints that both X-ray luminosity LX and X-ray spectral energy distribution bring to the galaxy evolutionary sequence HII->Seyfert/Transition Object->LINER->Passive suggested by optical data. Description: The cross match of all ChaMP sky regions imaged by Chandra/ACIS with the SDSS DR4 spectroscopic footprint results in a parent sample of 15955 galaxies on or near a chip and a subset of 199 sources that are X-ray detected. Among those, only 107 sources have an off-axis angle (OAA) θ<0.2deg and avoid ccd=8 due to high serial readout noise; these objects comprise the main sample we employ for this study. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 145 107 X-ray measurements of ChaMP-SDSS galaxies
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/A+A/525/A127 : Properties of X-ray selected AGNs (Tasse+, 2011) J/ApJ/690/644 : Properties of SDSS QSOs in the ChaMP (Green+, 2009) J/AJ/135/10 : SDSS-DR4/RASS source matching (Parejko+, 2008) J/AJ/128/1002 : SDSS candidate type II quasars. II (Zakamska+, 2004) http://hea-www.harvard.edu/CHAMP/ : ChaMP home page http://www.mpa-garching.mpg.de/SDSS/ : Catalogues built by the MPA/JHU collaboration http://cxc.cfa.harvard.edu/contrib/yaxx/ : YAXX script for Chandra analysis Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 18 A18 --- ObjID SDSS ObjID 20- 29 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 31- 39 F9.6 deg DEdeg Declination in decimal degrees (J2000) 41- 45 F5.3 --- z Spectroscopic redshift 47- 51 A5 --- --- [CXOMP] 53- 68 A16 --- CXOMP ChaMP X-ray source ID (JHHMMSS.s+DDMMSS) 70- 73 F4.1 arcmin OAA Chandra off-axis angle 75- 80 F6.1 ct Cts Net 0.5-8keV source counts 82- 86 F5.1 ks Exp Vignetting-corrected exposure time 88 A1 --- Targ [I] I: intended Chandra PI target 90- 93 F4.2 10+20cm-2 NHG Galactic 21cm column 95 A1 --- l_NHi Limit flag on NHi (1) 96-100 F5.2 10+22cm-2 NHi Best-fit YAXX intrinsic column density (2) 102-105 F4.1 10+22cm-2 E_NHi ? Positive 1σ uncertainty in NHi 107-109 F3.1 10+22cm-2 e_NHi ? Negative 1σ uncertainty in NHi 111-114 F4.1 --- Gamma Best-fit YAXX power-law index Γ (2) 116-118 F3.1 --- E_Gamma Positive 1σ uncertainty in Gamma 120-122 F3.1 --- e_Gamma Negative 1σ uncertainty in Gamma 124-130 F7.2 aW/m2 Fx X-ray flux (0.5-8keV) in units of 10-15erg/s/cm2 132-136 F5.2 [10-7W] Lx Log X-ray luminosity (0.5-8keV) in erg/s 138-145 A8 --- Class Optical spectral classification (3)
Note (1): Upper limits are at 90% confidence level. Note (2): YAXX (Yet Another X-ray Xtractor) from Aldcroft, 2006HEAD....9.1358A. Note that only for objects with >200 counts, NIntr.H, and Γ values are the result of fitting simultaneously a power law and absorption. Note (3): Classification as follows: S = Seyfert L = LINER (narrow-lined Low Ionization Nuclear Emission Regions) T = Transition Object (properties border on the definition of a starburst galaxy and an AGN) P = Passive galaxy (lacking optical emission line activity)
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 06-Dec-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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