Bibcode
Pović, M.; Sánchez-Portal, M.; Pérez García, A. M.; Bongiovanni, A.; Cepa, J.; Alfaro, E.; Castañeda, H.; Fernández Lorenzo, M.; Gallego, J.; González-Serrano, J. I.; González, J. J.; Lara-López, M. A.
Bibliographical reference
The Astrophysical Journal, Volume 706, Issue 1, pp. 810-823 (2009).
Advertised on:
11
2009
Journal
Citations
25
Refereed citations
20
Description
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 820 nm
and 920 nm atmospheric windows. In the present paper, public Chandra
X-ray data with total exposure time of 200 ks 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.