NGC 3175
Galaxy in the constellation Antlia
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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]
| 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 | |
| ESO 436- G 003, IRAS F10124−2837, 2MASX J10144211-2852194, NGC 3175, UGCA 207, LEDA 29892, MCG -05-24-028, VV 796[2] | |
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]
