NGC 3175

NGC 3175
NGC 3175 taken by the Hubble Space Telescope[1]
Observation data (J2000[2] epoch)
Constellation	Antlia
Right ascension	10h 14m 42.111s[3]
Declination	−28° 52′ 19.42″[3]
Redshift	0.003613[2]
Heliocentric radial velocity	1,081.1 km/s[4]
Distance	53.9 Mly (16.52 Mpc)[5]
Group or cluster	NGC 3175 group[6]
Apparent magnitude (B)	12.08[5]
Characteristics
Type	SAB(s)b[7]
Mass	(7.34±0.85)×1010[6] M☉
Mass/Light ratio	7.13+1.78 −1.98[6] M☉/L☉
Apparent size (V)	5′.0 × 1′.3[8]
Other designations
IRAS 1012-286P13, 2MASX J10144211-2852194, NGC 3175, LEDA 29892, MCG -05-24-028[2]

NGC 3175 is a spiral galaxy located in the far eastern part of the southern constellation of Antlia^[8] at an approximate distance of 54 million light-years.^[5] NGC 3175 was discovered on March 30, 1835 by English astronomer John Herschel,^[9] whose notes described it as, "considerably bright, large, much extended NE-SW, very gradually little brighter middle".^[10] This galaxy is the namesake of the NGC 3175 group of galaxies,^[6] which includes the spiral galaxy NGC 3137.^[11]

The morphological classification of this galaxy is SAB(s)b,^[7] which indicates a weakly-barred spiral galaxy (SAB) with no inner ring structure (s), and somewhat tightly wound spiral arms (b). It spans an angular size of 5′.0 × 1′.3,^[8] with the major axis aligned along a position angle of 56°. The plane of the galaxy is inclined at an angle of 77° to the line of sight from the Earth,^[12] and thus is being viewed close to edge on.

A study of the galaxy using the Australia Telescope Compact Array found that the outer disk of this galaxy, beyond a radius of 3.5 kpc from the core, is free of neutral hydrogen emission. This is an indication that no star formation is occurring, which is peculiar for a spiral galaxy. In contrast, the central region is undergoing star formation and contains 5.8×10⁸ M_☉ of neutral hydrogen. There are no nearby galaxies that could explain the stripping of hydrogen gas from the outer part of the galaxy.^[6]

See also

• Spiral galaxy

References

External links

• NGC 3175 on SIMBAD

Wikimedia Commons has media related to NGC 3175.