NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-25 T21:18:40 PDT
Help | Comment | NED Home

Notes for object NGC 7237

4 note(s) found in NED.


1. 2002AJ....124..675C
Re:UGC 11958 NED02
Very extended radio source 3C442A; S(1.4 GHz) is too low.

2. 1999MNRAS.309..969H
Re:NGC 7237
3.44 3C 442A
This peculiar radio galaxy (Comins & Owen 1991) is associated with
NGC 7237 in the merging galaxy pair NGC 7236/7237, which lies in a poor
cluster. The small-scale structure in the HRI image seems to suggest a
double X-ray core with separation roughly 20 arcsec in an east-west
direction. Such structure is unreliable because of aspect problems, but
the large extension makes an aspect-related explanation unlikely. Other
weak sources nearby are not doubled up in the same way, including one
apparently coincident with the small associated galaxy to the SE. No
compact source is found associated with NGC 7236. On larger scales, the
map smoothed with a Gaussian of {sigma} = 16 arcsec seems to show a bar
of X-ray emission, oriented roughly NNW-SSE (see Fig. 3); this lies in
approximately the same position angle as the common optical envelope of
the galaxy pair (e.g. Borne & Hoessel 1988) and approximately
perpendicular to the position angle of the radio source, contrary to the
prediction of Comins & Owen, who expected the hot gas to be aligned with
the radio source. An X-ray counterpart to one of the nearby radio point
sources ('E' in the notation of Comins & Owen) is also detected, but
source 'A' is not seen.
Because of the clear absence of radial symmetry in this source,
radial profiling is not appropriate. An upper limit is found for the
point-like counts by taking a 10-arcsec source circle about the X-ray
component coincident with the steep-spectrum radio core, using a
background region between 40 and 60 arcsec away; we correct the result
to our standard 1-arcmin source region. Total counts are derived from a
2.5-arcmin source circle.

3. 1976RC2...C...0000d
Re:NGC 7237
In Arp 169 = II Zw 172 = 3C 442 = Kara[72] 564
Interacting pair with NGC 7236 at 0.5 arcmin in common halo.

4. 1964RC1...C...0000d
Re:NGC 7237
Pair with NGC 7236 at 30 arcsec of distorted E or S0 galaxies.
Greenstein (1962) from a 200-inch photograph has dimensions of 60 arcsec.
Heidelberg Veroff. Vol. 9, 1926 dimensions rejected.
Faint anonymous galaxy 0.7 arcmin south-following.
Radio Source: 3C 442
Magnitude, Systemic Velocity, Spectrum, and Radio Emission:
Ap. J., 135, 679, 1962.


Back to NED Home