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Date and Time of the Query: 2022-01-27 T01:07:13 PST
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Notes for object NGC 2997

11 note(s) found in NED.


1. 2002A&A...389...68G
Re:NGC 2997
NGC 2997: this galaxy was also studied in the first paper using
a similar catalog. Using the new catalog we find values for the
IA that are in reasonable agreement between them, while the
values for the PA are not so well constrained. The mean of the
two methods are in agreement with the kinematical values from
Milliard & Marcelin (1981) and the photometric values from the
RC3 (1991) and, to a lesser extent, with the rest of the values.
We adopt the mean of our two methods.

2. 2000AstL...26..285C
Re:NGC 2997
NGC 2997. The image in the figure is overexposed, and it is better to
use the NASA atlas [4]. Two adjacent rows are formed by narrow chains of
H II regions. The total number of rows is apparently more than three.

3. 1997A&AS..125..479J
Re:NGC 2997
NGC 2997 (SABc, 1"~57 pc, I=44.5^deg^)
The twist of amplitude 25^deg^ between a=4" and 7.3"can be due to projection
effects alone.

4. 1994CAG1..B...0000S
Re:NGC 2997
Sc(s)I.3
CD-740-S
Feb 3/4, 1979
103aO + GG385
45 min
The spiral pattern in NGC 2997 is of the
grand design type; two main arms in the central
region branch into thick fragments covering the
outer disk, filling it much as in NGC 5194 (M51;
Hubble Atlas, pp. 26, 31; panels 172, 177
here), but less extreme here.
The inner disk is covered with thin, tightly
wound spiral dust lanes. The two most opaque
lanes begin at the center ((s) type) silhouetted
against the high-surface-brightness inner disk.
The two main luminous arms associated with
these dust lanes begin some distance from the
center, each after about half a turn outward from
the parent dust lanes. The arms become luminous
on the outside of the accompanying spiral dust
pattern.
A group of "hot spots" exist in the complex
center (Sersic and Pastoriza 1965).
Many HII regions exist in the
high-surface-brightness luminous arms. The largest
are complexes of several centers.
As in M51, the identification and
photometry of individual stars will be difficult
because of the problem of identification and
elimination of the small HII regions. The high
surface brightness of the arms also will make
photometry difficult.
The redshift is v_o = 799 km/s.

5. 1993ApJS...86....5K
Re:NGC 2997
NGC 2997 Sc(s), hot spot.
The nucleus of this "hot spot" galaxy has two parts, distinguished by
their optical properties: a central red core, consisting of older stars
and in a quiescent phase (no emission-line activity), and a blue annulus,
consisting of a number of knots, whose emission spectrum identifies them
as giant H II regions (Meaburn & Terret 1982). The radius of the ring is
about 4", and is included in the IUE slit (see Walsh et al. 1986). The UV
spectrum is weak and noisy, and the only convincing features are the
Si IV, C IV, and Mg II absorption lines. From population synthesis, the
knots of NGC 2997 apparently consist of reddened O stars and less
reddened B- and A-type stars (Walsh et al. 1986). The reddening is due
to the obscuration induced by the clumpiness of the H II regions.

6. 1985SGC...C...0000C
Re:NGC 2997
Plate 4740
Small overexposed center, very knotty arms. NGC 2973 = triple star;
ESO/Upps and RNGC incorrect.

7. 1982ESOU..C...0000L
Re:ESO 094328-3057.6
=ESO 434- G 35
in foreground of cluster

8. 1979AJ.....84..472S
Re:NGC 2997
Type Sc similar to NGC 4321 (M100),
but somewhat earlier along the sequcnce.
Hot spots in nucleus.
Many lumps in the multiple arms, among which will be HII regions
that are likely to resolve at the 1-2 arcsec level.
Highly inclined emission lines in the bright central region
with the slit along major axis (Sandage, A.R. 1978, A.J., 83, 904).

9. 1976RC2...C...0000d
Re:NGC 2997
Description and Classification:
P.A.S.P., 77, 287, 1965.
P.A.S.P., 79, 152, 1967.
Photograph:
P.A.S.P., 77, 287, 1965.
Observatory, 87, 225, 1967.
Ap. J., 192, 279, 1974.
Photometry:
Atlas Gal. Australis, 1968.
Ap. J., 192, 279, 1974.
Spectrum:
Observatory, 87, 225, 1967.
Spectrophotometry:
Ap. J., 192, 279, 1974.
Radio Observations:
Austral. J. Phys., 16, 360, 1963.

10. 1974UGCA..C...0000N
Re:UGCA 181
UGCA 181:
= NGC 2997
SAB(rs)c (RC1)

11. 1964RC1...C...0000d
Re:NGC 2997
Very small, very bright, complex nucleus. Smooth inner part with complex
spiral pattern of dark lanes. Pseudo (r): 2.1 arcmin x 1.5 arcmin. 2 main,
partially resolved, filamentary arms. Similar to Messier 101.


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