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J/ApJ/706/810 OTELO II. Optical properties of X-ray emitters (Povic+, 2009)
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Beginning of ReadMe :J/ApJ/706/810 X-ray emitters in the Groth-Westphal strip (Povic+, 2009)
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OTELO survey: deep BVRI broadband photometry of the Groth strip.
II. Optical properties of X-ray emitters.
Povic M., Sanchez-Portal M., Perez Garcia A.M., Bongiovanni A., Cepa J.,
Alfaro E., Castaneda H., Lorenzo M.F., Gallego J., Gonzalez-Serrano J.I.,
Gonzalez J.J., Lara-Lopez M.A.
<Astrophys. J., 706, 810-823 (2009)>
=2009ApJ...706..810P
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ADC_Keywords: Galaxy catalogs ; X-ray sources ; Morphology ; Surveys ;
Cross identifications
Keywords: galaxies: active - X-rays: galaxies
Abstract:
The Groth field is one of the sky regions that will be targeted by the
OSIRIS Tunable Filter Emission Line Object survey in the optical 820nm
and 920nm atmospheric windows. In the present paper, public Chandra
X-ray data with total exposure time of 200ks are analyzed and combined
with optical broadband data of the Groth field, in order to study a
set of optical structural parameters of the X-ray emitters and its
relation with X-ray properties. To this aim, we processed the raw,
public X-ray data using the Chandra Interactive Analysis of
Observations, and determined and analyzed different structural
parameters, in order to produce a morphological classification of
X-ray sources. We present the morphology of 340 X-ray emitters with
optical counterpart detected. Objects have been classified by X-ray
type using a diagnostic diagram relating X-ray-to-optical ratio (X/O)
to hardness ratio. We did not find any clear correlation between X-ray
and morphological types. We analyzed the angular clustering of X-ray
sources with optical counterpart using two-point correlation
functions. A significant positive angular clustering was obtained from
a preliminary analysis of four subsamples of the X-ray sources
catalog. The clustering signal of the optically extended counterparts
is similar to that of strongly clustered populations like red and very
red galaxies, suggesting that the environment plays an important role
in active galactic nuclei phenomena. Finally, we combined optical
structural parameters with other X-ray and optical properties, and we
confirmed an anticorrelation between the X/O ratio and the Abraham
concentration index, which might suggest that early-type galaxies have
lower Eddington rates than those of late-type galaxies.
Description:
Three contiguous fields centered at the original HST Groth-Westphal
strip (GWS) have been observed by the AEGIS collaboration, using the
Chandra/ACIS-I instrument. All data sets have been gathered from the
Chandra Data Archive (ObsID from 2002 to 2005). The total field size
of ACIS-I is 16.9'x16.9'.