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Date and Time of the Query: 2019-06-25 T21:47:53 PDT
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Notes for object NGC 5981

5 note(s) found in NED.


1. 2007MNRAS.378..594P
Re:NGC 5981
There is a possible dwarf elliptical companion visible at (R, z) = (-10 arcsec,
+30 arcsec), and another companion superimposed on the disc at (R, z) = (+77
arcsec, -5 arcsec). For both we have no velocity information, but there is
another large elliptical nearby (NGC 5982, 6.2 arcmin away with {DELTA}v ~= 1300
km s^-1^). NGC 5981 is slightly disturbed and asymmetric. The inner disc
is ~=1.5{degree} tilted against the outer disc and the bulge component is
furthermore slightly tilted against the inner disc. This asymmetry is reflected
in the radial profiles. The outer slope of a broken exponential fit is
significantly shallower on the NW(right) side, where also the contour map is
more extended. The single disc fit by Pohlen (2001) yields a vertical
scaleheight of h_z_ = 4.2 arcsec, a radial scalelength of h = 24.1 arcsec and an
inclination of 86.5{degree}.
The face-on-equivalent profile of NGC 5981 is well described as a Type II
with an inner shallow exponential (of h_in_ = 27.9 arcsec =2.0 h_out_) and an
outer steeper exponential (h_out_ = 13.8 arcsec) with a break at a radial
distance of R_br_ ~= 67 arcsec =2.4 h_in_ and at a surface brightness of
{mu}_br_ = 24.0 R-mag arcsec^-2^.
We find an increase in scalelength of ~=10 per cent between the major axis
and about 3.6 times the mean vertical scaleheight (at 15 arcsec) in the inner
region. Using only the two quadrants from the dust-free side for averaging (in
opposite to all four) this increase in scalelength for the inner disc grows to
~=25 per cent. In this case - as expected from the model fits (cf. Fig. 3) - the
scalelength on the major axis is less affected by the dust, so smaller, whereas
the scalelength at 3.6 vertical scaleheights is almost identical (29.7 arcsec
for the mean quadrant versus 29.2 arcsec for the dust-free part). The
scalelength beyond the break in the outer disc increases by a factor of 1.4
between 0 and 3.6 h_z_ in our mean quadrant. Owing to the described asymmetries
in the disc on both sides this galaxy is well suited to study their effects on
the deprojected profiles. Fitting only a mean quadrant obtained from the
NW(right) or SE(left) side of the galaxy separately we find differences of 5-10
per cent for the scalelengths of the inner region. In the outer disc (beyond the
break) the differences are clearly larger, e.g. 40 per cent on the major axis,
due to the obvious asymmetry.

2. 1976RC2...C...0000d
Re:NGC 5981
= Holm 719c
Non-interacting pair with NGC 5982 at 6.3 arcmin.

3. 1973UGC...C...0000N
Re:UGC 09948
Sc? (de Vaucouleurs)
In triple group with UGC 09961 at 6.2, 110; and UGC 09969 at 13.6, 64
15 35.6 +59 33 = NGC 5976 at 8.4, 172, 0.7 x 0.25, S0:, m=15.7

4. 1964RC1...C...0000d
Re:NGC 5981
= Holm 719c
Small, bright nucleus. Strong narrow dark lane. Similar to NGC 4565.
Heidelberg Veroff. Vol. 9, 1926 and Lund 6 dimensions are for the bright
part only.
Non-interacting pair with NGC 5982 at 6.3 arcmin.
In a group with NGC 5976, NGC 5982, and NGC 5985.

5. 1918PLicO..13....9C
Re:NGC 5981
A narrow spindle 2.5' long in p.a. 135^deg^. Well-marked absorption lane effect
on the northeast siae. See Abs. Eff.


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