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Multiwavelength Properties of the X-ray Sources in the Groth-Westphal Strip Field

Takamitsu Miyaji·Vicki Sarajedini·Richard E. Griffiths·Toru Yamada·Matthew Schurch·David Cristóbal-Hornillos·Kentaro Motohara
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Abstract

We summarize the multiwavelength properties of X-ray sources detected in the 80 ks XMM-Newton observation of the Groth-Westphal Strip. We find 23 XMM-Newton sources within the WFPC2 fields. Ten spectroscopic redshifts are available from the DEEP and CFRS projects and 4 of these show broad Mg II emission (type 1 AGNs). Two of those without any broad lines, nevertheless, have [NeV] emission which is an unambiguous signature of AGN activity, one of which is a narrow-line Seyfert 1 and the other a type 2 AGN. We have made near-infrared (NIR) spectroscopic observations using the Subaru OHS/CISCO spectrometer for five of the X-ray sources for which we found no indication of an AGN activity in the optical spectrum. We have detected H-alpha+[NII] emission in four of them. A broad H-alpha component and/or a large [NII]/H-alpha ratio is seen, suggestive of AGN activity. Nineteen sources have been detected in the Ks band and four of these are extremely red objects (I814-Ks>4). The optical counterparts for the majority of the X-ray sources are bulge-dominated with colors consistent with evolving elliptical galaxies, with starburst/AGN contamination. Assuming that the known local relations among the bulge luminosity,central velocity dispersion, and the mass of the central blackhole hold at about z=1, the AGN bolometric luminosity to Eddington luminosity ratio ranges from 0.3% to 10%. (abridged)

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Takamitsu Miyaji, Vicki Sarajedini, Richard E. Griffiths, Toru Yamada, Matthew Schurch, David Cristóbal-Hornillos, Kentaro Motohara. 2004-02-26. Multiwavelength Properties of the X-ray Sources in the Groth-Westphal Strip Field. https://doi.org/10.1086/420807

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