NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T23:30:18 PDT
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Notes for object PKS 2331-240

3 note(s) found in NED.


1. 2009A&A...508..107G
Re:WMAP J2333-2340
WMAP3 J2333-2340 (complete sample). The optical spectrum of this source (Wilkes
et al. 1983) shows emission lines and therefore, for consistency with current
literature classification methods, we classify it as a radio galaxy. However the
SED is typical of a blazar at all frequencies and shows a large optical
variability. In a high optical state, this object would have been classified as
a BL Lac.

2. 2008MNRAS.384..775M
Re:PKS 2331-240
Table 2 source 310, flagged as extended, appears to be the core of a well-known
and highly extended radio galaxy PKS 2331-240. The optical ID is a galaxy at z=
0.0477. The extended flux is well outside of the primary beam used for these
observations and the flux densities listed correspond mainly to the core.

3. 1976ApJS...31..143W
Re:PKS 2331-240
2331-240: Andrew et al. (1971) class this as a QSO on the basis of
identification with a stellar object, and a "wide emission band" at 5245 A.
Bolton (1975a) classes the same object as an E galaxy. It is clearly extended
on the Sky Survey prints and in the telescope. The emission line at 5244 A is
unresolved on our spectrogram (<~10 A wide). The other feature reported by
Andrew et al., at 3903 A, is a good fit to [O II] {lambda}3727 at the redshift
given here. The results of Andrew et al. therefore seem to be largely
incorrect, and OZ-252 should be removed from various lists of QSOs in the
literature. M. J. Disney (private communication) has reached similar
conclusions. The radio spectrum is interesting (see Andrew et al. for details)
and implies the existence of a radio component a few light-days in diameter.


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