NGC 2434
| NGC 2434 | |
|---|---|
 NGC 2434 seen by Dark Energy Spectroscopic Instrument Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Volans |
| Right ascension | 07h 34m 51.1806s |
| Declination | -69d 17m 02.843s |
| Redshift | 0.004637 |
| Galactocentric velocity | 300 km/s |
| Distance | 88 MLY |
| Group or cluster | LGG 147 |
| Apparent magnitude (V) | 11.26 |
| Apparent magnitude (B) | 12.5 |
| Surface brightness | 23.35 mag/arcsec2 |
| magnitude (J) | 8.87 |
| magnitude (H) | 8.14 |
| magnitude (K) | 7.89 |
| Characteristics | |
| Type | E0-1 |
| Mass | 8.541 ± 0.323 M⊙ M☉ |
| Other designations | |
| NGC 2434; ESO 059- G 005; ESO 073459-6910.3; WISEA J073451.18-691702.8; 2MASX J07345116-6917029 | |
NGC 2434 is an elliptical galaxy located in the Volans Constellation.[1] It was discovered by John Herschel in 1864. He described it as faint, small, round and pretty much brighter in the middle. There are three foreground stars in the same field of view, 11 arcminutes north of NGC 2434.[2]
It is part of a galaxy group known as LGG 147, which consists of at least of five members. The members of the group are NGC 2397, NGC 2442, NGC 2443, NGC 2434 and PGC 20690.[3] NGC 2434 has a diameter of 31.29 kiloparsecs.[4]
Roughly half its mass within an effective radius is dark matter.[5] Another source states NGC 2434 is a lenticular galaxy. NGC 2434 has a star formation rate (SFR) of 0.016 ± 0.010 M⊙/yr. It has an age of yr or around 300 million years.[6]
NGC 2434 is detected weakly at a 20 cm radio wavelength ( = 2.0 ± 0.1 mJy) and is not detected in wide-field infrared survey explorer (WISE) W3 Polycyclic aromatic hydrocarbon (PAH) or total infrared, indicating little dust or a quiescent galaxy. WISE photometry of NGC 2434 has flux densities of 141.7 ± 0.6 mJy at 3.4 μm (W1), 78.0 ± 0.3 mJy at 4.6 μm (W2), and 20.6 ± 0.1 mJy at 12 μm (W3). The strong W1 and W2 indicates an old stellar population, while W3<W2 indicates little warm dust or PAH emission.[6]
References
[edit]- ↑ "NGC 2434". TheSkyLive. Retrieved 26 September 2026.
- ↑ Dreyer, J. L. E. (1888). "A New General Catalogue of Nebulae and Clusters of Stars, being the Catalogue of the late Sir John F. W. Herschel, Bart., revised, corrected, and enlarged". Memoirs of the Royal Astronomical Society. 49: 1–237. Bibcode:1888MmRAS..49....1D.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy & Astrophysics Supplement Series. 100: 47–90. Bibcode:1993A&AS..100...47G.
- ↑ "NED results for object NGC 2434". NASA/IPAC Extragalactic Database (NED). California Institute of Technology. Retrieved 26 September 2026.
- ↑ Rix, Hans-Walter; de Zeeuw, P. Tim; Cretton, Nicolas; van der Marel, Roeland P.; Carollo, C. Marcella (1997). "Dynamical Modeling of Velocity Profiles: The Dark Halo around the Elliptical Galaxy NGC 2434". The Astrophysical Journal. 488 (2): 702–719. arXiv:astro-ph/9705085. Bibcode:1997ApJ...488..702R. doi:10.1086/304733.
- 1 2 Saponara, J.; Koribalski, B. S.; English, J.; Humire, P. K. (2025). "MeerKAT radio continuum imaging of nearby star-forming spirals in the NGC 6221, NGC 3256/3263, and NGC 2434 galaxy groups". Astronomy & Astrophysics. Bibcode:2025A&A...701A..87S. doi:10.1051/0004-6361/202453465.
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