NGC 4299
SDSS image of NGC 4299
Observation data ( J2000 epoch)
Constellation	Virgo
Right ascension	12h 21m 40.5s [1]
Declination	11° 30′ 00″ [1]
Redshift	0.000791 [1]
Heliocentric radial velocity	237 km/s [1]
Distance	55  Mly (16.8  Mpc) [1]
Group or cluster	Virgo Cluster
Apparent magnitude (V)	12.88 [1]
Characteristics
Type	SAB(s)dm [1]
Size	~36,000  ly (11  kpc) (estimated) [1]
Apparent size (V)	1.7 x 1.6 [1]
Other designations
VCC 491, IRAS 12191+1146, UGC 7414, MCG +02-32-010, PGC 39968, CGCG 70-25 [1]

NGC 4299 is a featureless spiral galaxy ^[2] located about 55 million light-years away ^{[3] [4]} in the constellation Virgo. It was discovered by astronomer William Herschel on March 15, 1784 ^[5] and is a member of the Virgo Cluster. ^{[6] [4] [7]}

NGC 4299 forms an interacting pair with NGC 4294. ^[8]

Physical characteristics

NGC 4299 has a fairly featureless disk ^[9] with a very small, weak bulge and weak, asymmetric spiral arms ^[10] plus numerous bright HII regions. ^{[11] [12]}

At the center of NGC 4299 lies a nuclear star cluster ^{[13] [14]} with a diameter of ~5.9  ly (1.8  pc). ^[15]

Truncated Hα disk

NGC 4299 has a truncated Hα disk with the outer extent of the Hα having an irregular distribution except in the southwest where it forms a well-defined ridge. This appears to be the result of ram-pressure. ^[12]

Interaction with NGC 4294

As a result of a tidal interaction with NGC 4294, NGC 4299 has a disturbed optical and HI morphology, ^{[16] [11]} with asymmetric spiral arms, a small, weak bar ^[10] and a high global star formation rate that appears to have been enhanced by ram-pressure. ^[12]

HI tail

Chung et al. identified that NGC 4299 has a one sided ^{[17] [18]} tail of neutral atomic hydrogen (HI). ^{[10] [19]} The tail points to the southwest ^{[17] [8]} and appears to be a result of ram-pressure ^{[19] [20] [10]} or by a tidal interaction with NGC 4294. ^[10] The tail has no optical counterpart ^{[10] [17]} and is oriented parallel to the HI tail found in NGC 4294. ^[17]

NGC 4299 appears to have a second tail pointing to the southeast that is much broader and lower in HI surface density than the main tail. ^[17]

Black Hole

NGC 4299 may harbor an intermediate-mass black hole with an estimated mass ranging from 7,000 (7*10^3) to 200,000 (2*10^5) solar masses. ^[21]

See also

• List of NGC objects (4001–5000)

References

External links

Wikimedia Commons has media related to NGC 4299.

• NGC 4299 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images