Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..666..265w&link_type=abstract
THE EMERGENCE OF COSMIC STRUCTURE: Thirteenth Astrophysics Conference. AIP Conference Proceedings, Volume 666, pp. 265-268 (200
Astronomy and Astrophysics
Astrophysics
Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Stellar Content And Populations, Radii, Morphology And Overall Structure, Galactic Nuclei, Circumnuclear Matter, And Bulges, X-Ray
Scientific paper
More than half of the approximately 360 Lyman-α emitters found by the LALA survey show rest equivalent widths (EWs) larger than 200 Å, which is the maximum EW expected for normal stellar population. The high EWs can be reproduced by stellar populations with high proportions of young, massive stars, or by type 2 AGNs, which are supposed to be detectable in X-ray by deep Chandra images. An 180 ks Chandra ACIS exposure was obtained to study the X-ray properties of these emitters. However, none of the 49 sources imaged was significantly detected (over 2σ level) in X-ray. These sources cannot be detected in the stacked X-ray image either, which has an effective Chandra exposure time of 6.5 million seconds. The 3σ upper limit of the average X-ray flux is 7.9 × 10-17 erg.cm-2.s-1 in the 0.5 - 10.0 keV band, which is much fainter than the type 2 quasars discovered by Chandra so far. Optical spectra also show no AGN signatures.
Brown Michael
Heckman Timothy
Malhotra Sangeeta
Norman Colin
Rhoads James
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