PKS 2149-306 and CXOCDFS J033225.3-274219: Two AGNs with Unusual Spectra Possibly Blueshifted?

Details PKS 2149-306 and CXOCDFS J033225.3-274219: Two AGNs with Unusual Spectra Possibly Blueshifted? PKS 2149-306 and CXOCDFS J033225.3-274219: Two AGNs with Unusual Spectra Possibly Blueshifted?

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....131.1231b&link_type=abstract

The Astronomical Journal, Volume 131, Issue 3, pp. 1231-1235.

Astronomy and Astrophysics

Astronomy

7

Cosmology: Miscellaneous, Galaxies: Active, Galaxies: Quasars: Emission Lines, Quasars: Individual (Pks 2149-306), Quasars: Individual (Cxocdfs J033225.3-274219), X-Rays: Galaxies

Scientific paper

PKS 2149-306 and CXOCDFS J033225.3-274219 each exhibit several emission lines in their optical spectra from which their redshifts have been determined. However, an ASCA spectrum of the first object has detected an emission line at 5 keV observed wavelength, and the Chandra ACIS-I spectrum of the second object shows a very strong emission feature at the observed wavelength of 6.2 keV. The two lines cannot be identified with any known search line on the basis of their redshift values without invoking extremely large outflow bulk velocities of 0.6c-0.75c. Such high bulk velocities are practically unheard of in any other observations of extragalactic objects. We show here that all the lines in both the optical and X-ray spectra of the two objects can be identified with lines at longer wavelengths that are blueshifted. We propose a scenario in which the spectrum is blueshifted due to net apparent motion toward the observer, resulting from an ejection.

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