Date and Time of the Query: 2019-08-21 T20:18:44 PDT
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Notes for object [HB89] 0252-549

4 note(s) found in NED.

1. 2008ApJS..175..314D
Re:VSOP J0253-5441
J0253-5441.-The core is 0.3 mas in size, in agreement with Ojha et al. (2005).
The fainter component to the west is too weak to be detected by VSOP.

2. 2005A&A...435..839T
4.2 Previously identified inverted-spectrum sources
B0252-549: this source is a quasar at z = 0.539. Its spectrum seems to
be convex with a turnover at 37 GHz but the variability observed at
90 GHz suggests that the lower envelope of the spectrum could be flat.
The only data between 20 and 90 GHz are Wilkinson Microwave Anisotropy
Probe (WMAP) data from the CATS database (Verkhodanov et al. 1997) and
there is no information on the simultaneous low frequency behaviour.
Even though the parameters would qualify this source to be a genuine
GPS source in our classification, the lack of data makes the
interpretation of the spectra questionable and thus this source is
classified as a convex-spectrum source.

3. 2001AJ....121.1306T
Re:[HB89] 0252-549
B0252-549 (z = 0.537). - A rarely observed source with no polarization
information available. Our spectrum consists of only seven data points,
taken at six different frequencies. Thus no variability information is
available, and the frequency coverage is sparse. The plot shows a spectrum
that is moderately inverted from 2.7 to 90 GHz, but the low-frequency part
of the spectrum is flat rather than inverted, and the inverted shape of the
high-frequency part may be due to variability only.

4. 1996MNRAS.283..282R
Re:[HB89] 0252-549
PKS 0252-549, radio loud (z=0.537) The host in this object is embedded in a
faint halo, of surface brightness ~26 mag arcsec^-2^ in R (a level not seen in
the contour plot), which is elongated in the direction of a companion object
located 44 kpc SW of the host. The extension of the halo is about 50 kpc.
Within this halo several fainter objects are located. The halo could be the
stellar debris from the interaction with the companion, which is nearly as
bright as the host galaxy.

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