Date and Time of the Query: 2019-03-18 T21:02:51 PDT
Help | Comment | NED Home

Notes for object NGC 5085

8 note(s) found in NED.

1. 2002ApJS..143...73E
Re:NGC 5085
NGC 5085.---SABbc: Small, bright bulge. Outer bulge isophotes are
elliptical, but no other evidence of a bar. Grand-design two-armed
spiral, with well defined, broad spiral arms. Arms can be traced
nearly 360deg before fading. Arm that emerges on the SW of the bulge
bifurcates after winding almost 180deg. Both arms have many
star-forming knots, even quite far out in the disk.

2. 1998A&A...336..840G
Re:NGC 5085
4.2. NGC 5085
NGC 5085 is also classified as a SAS5 galaxy in RC3 and has an arm
class of 2 specifying fragmented spiral arms with no regular pattern
(Elmegreen & Elmegreen 1982). Contrary to this description, the K' image
(Fig. 6a) shows an open, grand design spiral structure. The strong
spiral pattern makes it difficult to determine the sky projection
parameters directly from 2D fit of an exponential disk to its K' image.
The orientation of the major axis estimated from the {theta}_2_ phase
variation and that derived from the two long-slit spectra, assuming
circular velocities, agree within 2^deg^ but differ by more than 20^deg^
from the value given in RC3. This also affects the estimated inclination
angle which is significantly higher than that suggested by the RC3 value
for R25.
The spiral structure on the B image appears to reach much closer to the
center than the K' spiral. This impression is created by the very sharp
dust lanes as seen on the (V-K') map (Fig. 6b) which penetrate to an
inner radius of 4" while the spiral pattern in K' only can be traced in
to a radius of 13". Outside this radius, the main dust lanes are
located on the inner side of the spiral arms. The axisymmetric K'
profile (Fig. 1b) suggest a shorter scale length of the disk outside
60". This may rather be due to an excess of light from young objects in
the main spiral arms inside this radius than to change in the old
stellar disk population. The colors show a smooth radial variation
without significant features. The (V-K') map suggests a weak color
gradient perpendicular to the major axis.
The radial variation of {theta}_2_ (Fig. 7c) shows the main two-armed
spiral starting around 14" and reaching almost 45" where the phase gets
constant possibly caused by a warp, a small projection error, or a minor
residual in the sky background. In the inner regions an oval distortion
with an amplitude of a_2_~0.1 can be identified in the radial range
7-13" while a tight inner spiral is visible inside 5" with a_2_ < 0.1.
The main spiral has an amplitude around 0.1 in the inner parts but
increases to almost 0.2 at a radius of 30". The a_4_ amplitude increases
at the start of the main spiral and becomes equal to a_2_ at 42". The
absolute amplitude of the spiral pattern is not significant compared to
the uncertainty of the average K' intensity outside 50". At this radius,
small errors in the projection become important causing the steep
increase in a_2_.
The transition between the oval distortion and the main two-armed
spiral occurs in the region 10-15" and suggests a major resonance in this
radial range. Similarly, the peak of the a_4_/a_2_ ratio at 42" and the
end of the symmetric spiral pattern just outside this radius indicate
another resonance. The only pattern speed {OMEGA}_p_ which locates major
resonances close to these radii is 18.9 km s^-1^ kpc^-1^ with ILR at 12" and
4:1 at 41". The CR would be at a radius of ~77" which roughly
corresponds to the outer limit of the spiral structure seen on the B

3. 1994CAG1..B...0000S
Re:NGC 5085
April 3/4, 1981
103aO + GG385
45 min
Two principal well-defined arms of low
surface brightness begin near the center, tangent
to the edge of a small central bulge. Prominent,
regular dust lanes exist inside each of the two
main arms over about half a revolution from
their beginnings.
The outer disk is filled with spiral fragments,
which originate not as branches of the two
main arms but rather as dust lanes covering the
disk, as in the NGC 2841 flocculent pattern.
These lanes in the outer disk either turn
luminous in short segments or are defined by a
pattern of HII regions. The pattern is not
chaotic, but, aside from the inner parts of the two
principal grand design arms, the outer spiral
fragments are difficult to trace.
The redshift is v_o = 1720 km/s.

4. 1994AJ....108.2128C
Re:PGC 046531
PGC 046531 = NGC 5085. Delete B_T_, all colors, log A_e_, and m'_e_;
apertures are too small. B^o^_T_ = 11.57, HI = 1.26.

5. 1985SGC...C...0000C
Re:NGC 5085
Plate 2347
Overexposed center, patchy arms with many knots. Faint companion 1.7 north.

6. 1982ESOU..C...0000L
Re:ESO 131734-2410.7
=ESO 508- G 50
in foreground of cluster

7. 1974UGCA..C...0000N
Re:UGCA 349
UGCA 349:
= NGC 5085
SA(s)c (RC1)
main body 2.8 x 2.1,
very faint outer disk, tendency to bar structure on red POSS

8. 1964RC1...C...0000d
Re:NGC 5085
Very small, bright nucleus in a bright inner lens: 0.35 arcmin x 0.3 arcmin.
2 main, knotty arms with dark lanes and some branches. Similar to M51.
Helwan 30 and 38 dimensions are for the bright part only.

Back to NED Home