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Notes for object NGC 3994

11 note(s) found in NED.


1. 2002MNRAS.329..747T
Re:NGC 3994
4.1 NGC 3994 and 3995 are separated by ~1.8 arcmin and are
interacting with the galaxy NGC 3991 which lies 3.7 arcmin to the
north-west of the pair. The triplet are also known as Arp 313 (Arp
1966). Baldwin, Phillips & Terlevich (1981) classified NGC 3994 as a
LINER. A red continuum map shows that NGC 3994 has a complex structure
with vigourous star formation in the outer ring-like arms and in wisps
extending out of the galaxy (Keel et al. 1985). NGC 3995 also shows
signs of active star formation, with ~20 high-luminosity H II regions
apparent in an H{alpha} map of the galaxy (Keel et al. 1985). Both NGC
3995 and NGC 3994 were only weakly detected at 850 microns. Single-dish
H I observations have measured fluxes ranging from 10.32 to 46.4 Jy km
s^-1^. All of these observations suffered from varying degrees of
confusion with nearby sources, depending on the pointing centre and
size of the beam. We have measured a flux of 11.43 Jy km s^-1^ from NGC
3995, but do not detect any emission from NGC 3994.

2. 2002AJ....124..675C
Re:UGC 06936
F11551+3233 may be a blend of UGC 06936 and UGC 06944.

3. 1999A&AS..135..437G
Re:NGC 3994
NGC 3994 is an Sbc galaxy (Sandage & Bedke 1994) in a triple system,
interacting both with NGC 3991 and NGC 3995. Based on the observed line
ratios, Keel et al. (1985) classified it as a Liner; the
{lambda}5007/H{beta} and {lambda}6583/H{alpha} values rather suggest a
H II region. We found that its spectrum is "composite", the main
contribution to the Balmer lines coming from a starburst. The relative
strength of the [O I] lines is large in the other component
({lambda}6300/H{alpha} = 0.53), suggesting that it is a Liner.

4. 1998A&AS..130..333T
Re:PGC 037616
NGC3994
3 objects (ARP 313): NGC3994 (Sc galaxy expected at V=3133 km/s, LEDA),
NGC3991 (Irr galaxy expected at V=3192 km/s, LEDA), and NGC3995 (Sm
galaxy expected at V=3250 km/s, LEDA). HI confusion.

5. 1994CAG1..B...0000S
Re:NGC 3994
Karachentsev 311 [with NGC 3995; NGC 3991 nearby]
PH-8054-S
Sbc or Sc
Feb 4/5, 1981
Arp 313
103aO
12 min
Racine wedge
NGC 3995 is the brightest galaxy of a
multiple interacting group whose next-brightest
members are NGC 3994 (Sbc; it is the closest
galaxy to NGC 3995) and NGC 3991. The
morphology of NGC 3991 is dominated by a thin
tidal plume in which very bright HII-region
candidates are present. Karachentsev lists redshifts
of v_o(3394) = 3086 km/s and v_o(3395) = 3232 km/s.
The redshift listed for NGC 3991 by
Palumbo et al. (1983) is 3256 km/s. From
these three redshift values, the mean redshift
distance of the group is 64 Mpc (H = 50).
The angular separations of NGC 3994 and
NGC 3991 from NGC 3995 are 1.9' and 3.7',
respectively. The corresponding projected linear
separations are 35 kpc and 68 kpc.
The morphology of NGC 3994 (the fainter
of the close pair) is normal for a late-type Sbc or
Sc. There is no evidence of tidal distortion
despite its apparent closeness to NGC 3395.
However, tidal disruption is clearly evident in
NGC 3991, the more distant in projection of the
triplet.
The two main prints of NGC 3395 (the
brightest galaxy of the group) also show evidence
of morphological distortion. It would seem that
the interaction has been between NGC 3995 and
NGC 3991, not involving NGC 3994.

6. 1993ApJS...86....5K
Re:NGC 3994
NGC 3994; Sc, LINER.
This galaxy interacts with both NGC 3991 and NGC 3995. On the basis of
the criteria given by Baldwin et al.(1981), NGC 3994 is classified as a
LINER. It has a complex structure, with vigorous star formation going on
in the ringlike outer arms (Keel et al. 1985). NGC 3994 also has a weak
broad component of H{alpha} and is a radio source (Hummel et al. 1987b).
In spite of the signs of activity in the optical and radio wave bands,
the UV spectrum shows no evidence of emission lines, while the shape of
the continuum resembles that of a normal Sc galaxy, with some additional
continuum emission between 1500 and 1900 A.

7. 1976RC2...C...0000d
Re:NGC 3994
= Arp 313
= VV 249
= Holm 309b
In multiple interacting system with NGC 3991 and NGC 3995.

8. 1975ByuO...47....1A
Re:ARK 337
(= NGC 3994)
Galaxy is of type Sc, entering into a triple system.
Red color.
T. Page notes an emission-line spectrum of H{alpha} and 3727
Radial velocity = +3,133 km/sec [1970, Ap. J., 159, 791].

9. 1973UGC...C...0000N
Re:UGC 06936
VV 249b, Arp 313a
See UGC 06933
UGC 06944 at 2.0, 242
SA(r)c pec? (de Vaucouleurs)
See UGC 06944
SN 1956a

10. 1964RC1...C...0000d
Re:NGC 3994
= Holm 309b
Small, bright nucleus. Pseudo (r): 0.25 arcmin x 0.1 arcmin. Poorly resolved.
Faint outer streamer toward NGC 3995.
Pair with NGC 3995 at 1.8 arcmin.
In multiple system with NGC 3994 and NGC 3995.
Photograph:
Sky & Telescope, 17, 231, 1958.
Spectrum:
P.A.S.P., 69, 386, 1957.

11. 1959VV....C...0000V
Re:VV 249b
= NGC 3394
Yerkes Type: afS5p or afI


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