The magnitudes are based on aperture photometry using DAOPHOT. The size of the aperture was selected in such a way that 1) as much light as possible was included in the aperture while keeping the errors reasonable but 2) the companions were excluded. The image shapes are determined by the moments of the brightness distribution using IMEXAMINE (Eq. (4) in Valdes et al. 1983) with the size of the aperture the same as in photometry. The estimation is vague for small ellipticity (e.g. RC 1152+0449) or when the inner regions have a different position angle than the outer regions (e.g. RC 1031+0443). The results of photometry and image shape analysis are given in Table 4. The magnitudes between this work and K95b are generally in agreement. The differences are primarily caused by the better seeing conditions at NOT, as compared with the 6 m-telescope and the different size of the aperture.
Figure 4: Grey scale images of all the uncertain identifications (see Sect. 3.2). The images are produced in the same way as for Fig. 3. For RC 0459+0456 we also give an R-band contour map |
RC 0457+0452
This is one of the brightest objects in this sample.
The new VLA map shows that the radio source has FRI
structure (an unpublished radio map).
This agrees with a high optical to
radio luminosity ratio
(Parijskij et al. 1996a).
There is a near companion 2.5 northwest from the nucleus.
In addition there are four faint companions in the southeast (5).
The position angle of the galaxy is not uniform,
which is possibly due the close companions.
The inner isophotes are roughly perpendicular to the radio axis
and the outermost fuzz is roughly aligned with the radio axis.
The same trend can be seen in both R and
V-band images.
This object is possibly situated in a cluster of galaxies and
there are a few companions with similar brightness. The
companion 20 to the east has a double nucleus
(mR=19.26, mV-R=0.69), hence it is
apparently a merger, and the companion 22 to the
south has distorted morphology (mR=19.94, mV-R=0.93).
RC 0506+0508
This is a faint point-like source, even under excellent seeing
conditions.
It might be a high redshift (z>1, mR< -23) quasar
because
in the quasar catalogue by
Veron-Cetty & Veron (1996)
there are only a few quasars fainter than
21 magnitudes with z<1.
The companions 14 to the northwest have a multicomponent
structure with an extended diffuse emission.
RC 0837+0446
The galaxy is marginally resolved and lies
in or behind a galaxy cluster.
In the lower left hand corner of the grey scale image is a
trail of a solar system object.
RC 0845+0444
The optical counterpart of this radio source
coincides with the western radio component.
This object is optically extended
and there is a
faint extension towards the southwest.
RC 1031+0443
(4C+05.43 & PKSB1028+049).
The galaxy is near the centre of gravity of the radio source.
The object is extended and has a multicomponent structure.
The strongest optical emission is aligned with the radio source,
but the position angle of the outermost isophotes is
almost perpendicular to the radio axis.
RC 1152+0449
This galaxy
has two or possibly three components.
The outer isophotes of the galaxy are box-like,
but the separate components are roughly aligned with the
radio axis.
The faint companion 4 to the west is near to the
western radio lobe. This blue companion may be related
to the radio source ().
This is the only source where the astrometry of the present work is not consistent with the result of K95b, but coincides with current identification in Parijskij et al. (1996a).
RC 1155+0444
This is the brightest galaxy in our sample.
The galaxy is elliptical and it is clearly aligned
with the radio source.
The two neighbouring galaxies are possibly interacting
foreground galaxies.
RC 1235+0453
This faint galaxy is spatially extended
in our R-band images.
The fuzz 1 northwest from the nucleus
has a clumpy structure.
Our deep images show faint low surface brightness
companions near the object to the east, north and west.
In the V-band images only the
core of the galaxy is detected.
RC 1347+0441
This galaxy is the faintest of our sample.
The object is elongated and
the size of the optical object is roughly the same as the
radio source.
RC 1510+0438
This is the most spectacular object in our sample,
lying in a group of galaxies and having apparently
wavelength dependent properties.
In the R- and I-band image the object is almost round
(Table 4) but in the V-band the object is weakly elongated with
the same position angle as the radio source.
The redshift estimation from BVRI colours suggest
(Pariskij et al. 1996b).
If this is the case, the strong emission lines [Oii]
3727 and [Oiii] 5007 would be shifted into R and I band,
respectively, possibly causing the wavelength dependence of morphology.
However, new colours from the 6 m-telescope
do not agree with strong line contribution.
Another consequence of such redshift would be that
this would be one of the faintest
(intrinsically) radio galaxies in the Hubble diagram (Fig. 2).
There are three relatively bright galaxies and one faint companion galaxy
within 5 of the object.
All the companions are bluer than the object (mR-I=1.52).
The objects towards the east,
C1 (mR=22.54, mV-R=0.51, mR-I=0.27),
north, C2 (mR=22.34, mV-R=0.81, mR-I=0.87)
and west,C3 (mR=23.24, mR-I=0.83) could be foreground galaxies.
In addition there is a faint companion 15 north from the
object.
RC 1703+0502
(PKS B1701+051).
This is one of the strongest and most compact radio sources
of the present sample.
The optical and radio axes are clearly aligned and the sizes are
almost the same.
There are a few faint galaxies in the field, but no
close companions.
This object is possibly located behind
a foreground galaxy cluster although some of the
field objects might be faint galactic stars.
RC 1720+0455
This object is compact in radio and optical.
This suggests that it is a QSO and
the same conclusion may be drawn from radio-optical luminosity
consideration
(Parijskij et al. 1996a).
The extension towards the southeast, seen in K95b, was an artifact.
There are a few companions close to the object.
The southern companion either has a double nucleus or a dust lane.
The wide field image shows several faint companions,
hence this galaxy is either in a cluster of galaxies or behind one.
RC 1740+0502
This source was identified by K95b
and it is marginally resolved in the R-band image.
In the V-band image the object has an extension to the
south west in contrast to almost round morphology in R-band
(see Table 4).
RC 2013+0508
This unresolved object could possibly be a quasar.
Because of its low galactic latitude (),
the field is crowded with stars.
RC 2036+0451
(MRC 2034+046).
This is the second of the two triple radio sources in this sample.
A point source coincides with the central component fairly well.
This is the only object with known redshift (z=2.95
Pariskij et al. 1996a).
This indicates that the
absolute magnitude of this quasar is .
RC 2144+0513
This object is unresolved.
The companion 3 to the southwest is most likely a
galactic star (mR=20.90, mV-R=1.1).
The profile of this object matches
perfectly with the average stellar profile from the same field.
RC 0459+0456
(MRC 0456+048)
This source has two candidates for optical identification in
K95b. Id1 (mR=22.08) is an elongated galaxy with roughly the same
position angle as the radio source. This object has a
companion to the west (Id2). This is a marginally resolved
point-like source, hence it might be
a quasar with a host galaxy (mR=21.12).
FWHM of the id2 066 compares with FWHM of a field star
062.
RC 1219+0446
This is the largest radio source in our sample
(118). The nature of the source remains unclear
and it is possible that there are indeed two independent radio sources.
If this is one source, then a possible identification would be a
faint, rather round galaxy (Id1) 5 from the centre of
radio source (mR=21.9).
On the other hand if the southern radio lobe is an independent
object, the identification could be an unresolved
object (Id2) 2 southeast from the radio source (mR=17.88).
RC 1735+0454
The possible optical counterpart is 3 to the east of
the radio source. The galaxy has several components and it is elongated
in a north south direction.
The identification should be confirmed by future observations.
RC 0743+0455
This object is very faint and hardly visible in the 30 min exposure.
RC 1333+0451
The radio source is compact. There is a faint
extended emission exactly at the position of the radio source.
RC 1609+0456
New 6-m telescope measurements find an object with
exactly at the position of the radio source.
Our 600 s exposures are not deep enough to detect
this object.
The bright nearby object is unresolved and BVRI photometry by K95b
suggests it to be a star.
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