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Date and Time of the Query: 2019-05-21 T00:12:06 PDT
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Notes for object NGC 1232

7 note(s) found in NED.


1. 2000AstL...26..285C
Re:NGC 1232
NGC 1232. Almost each spiral in this multiarm galaxy is crooked. The
longest row is rather blurred, but contains a remarkably narrow, bright
chain inside, which is apparently formed by H II regions.

2. 1994CAG1..B...0000S
Re:NGC 1232
[Pair with] NGC 1232A
Hubble Atlas, p. 32
Sc(rs)I
CD-679-Br
Jan 26/27, 1979
103aO + GG385
45 min
NGC 1232 is one of the wonders in the sky.
It is the prototype of a highly regular
multiple-armed spiral of the earliest luminosity
class.
The arms start at the edge of a
high-surface-brightness disk. Only two major arms
begin at this rim. After about one-quarter
revolution, each branches into two fragments which
after further unwinding branch again until a highly
multiple armed structure spreads over the outer
disk.
Each fragment is well separated from the
others; the geometrical entropy of the pattern is
as low as in any galaxy in the RSA, equal or
somewhat lower than in other highly regular Sc
galaxies such as NGC 309 (Hubble Atlas, p. 32;
panel 221 here) and NGC 5364 (Hubble Atlas,
p. 32; panel 217 here).
The arms are filled with HII regions and
candidates for brightest stars. The largest HII
regions have core + halo diameters of 3". The
redshift is v_o = 1775 km/s.
The SBmIII companion to the east is
separated from NGC 1232 by 4.0'. There is
confusion (c. 1992) as to whether this highly
resolved galaxy is at the same distance as
NGC 1232. The redshift of NGC 1232A measured by
Welch, Chincarini, and Rood (1975) of
v_o = 1780 km/s was rejected by de Vaucouleurs,
de Vaucouleurs, and Nieto (1979) in favor of
v_o = 6496 km/s measured by them from an H{alpha}
line. However, a 21-cm HI redshift of v_o = 1772
km/s by Reif, Mebold, Goss, van Woerden, and
Siegman (1982) confirmed the early value by
Welch et al. But an even later 21-cm redshift
confirms the larger redshift near v_o = 6500 km/s.
The resolution of NGC 1232A into stars
and HII regions at the same level as in NGC 1232
itself makes no sense in the conventional
interpretation of redshifts as a precise distance
indicator if the high redshift value is correct. The
case remains an important mystery (c. 1992).
At the mean redshift distance of 35 Mpc, the
projected linear separation of NGC 1232A from
NGC 1232 is small at 41 kpc if they are at the
same distance. If not, the mystery remains.

3. 1985SGC...C...0000C
Re:NGC 1232
Plate 3749
Overexposed center (short bar?), thin very knotty arms.

4. 1982ESOU..C...0000L
Re:ESO 030730-2046.1
=ESO 547- G 14
includes ESO 547- G 16

5. 1976RC2...C...0000d
Re:NGC 1232
= Arp 041
Non-interacting pair with NGC 1232A at 4.0 arcmin
Description:
IAU Symp. No.29, 421, 1968.
IAU Symp. No.38, 30, 1970.
Photograph:
IAU Symp. No.29, 421, 1968.
HII Regions:
"Atlas and Catalogue", Univ. Washington, Seattle, 1966.
Ap. J., 168, 327, 1971.
Ap. J., 194, 559, 1974.
Distance Modulus:
Ap. J., 194, 559, 1974.
Radio Observations:
Australian J. Phys., 16, 360, 1963.

6. 1964RC1...C...0000d
Re:NGC 1232
Very small, bright diffuse nucleus
in a weak broad bar.
Pseudo (r): 0.8 arcmin x 0.55 arcmin.
Many knotty, partially resolved filamentary arms
with many branching.
Non-interacting pair with NGC 1232A at 4.0 arcmin.
One aberrant value of B-V (source C) rejected.
Photograph:
P.A.S.P., 53, 269, 1941.

7. 1961Hubbl.B...0000S
Re:NGC 1232
Sc
PH-74-H
0ct. 14/15, 1950
103aO
30 min
Enlarged 2.0X
There is no complete internal ring in NGC 1232. However,
the arms do not spiral out from the nucleus but
rather begin tangent to the central amorphous nucleus
and lens. Two principal arms originate on this central
region. These arms branch into many segments soon after
they leave the central lens. The branching of the arm
which starts at the west point of the amorphous lens is
particularly conspicuous. The arm branches almost immediately
at this junction; each separate branch again divides
after a turn of 120 degrees. Additional divisions farther
on form the multiple-arm pattern. The pattern resembles
that of M101 but is slightly more regular.


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