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19 April 2024 |
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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
; | | Date: |
26 Feb 2004 | | Journal: | Astron.J. 127 (2004) 3180 | | Subject: | astro-ph | | 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) | | Source: | arXiv, astro-ph/0402617 | | Services: | Forum | Review | PDF | Favorites | |
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