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| NGC 1784 | |
|---|---|
 NGC 1784 by Legacy Surveys | |
| Observation data (J2000 epoch) | |
| Constellation | Lepus |
| Right ascension | 05h 05m 27.1s[1] |
| Declination | −11° 52′ 17″[1] |
| Redshift | 0.007735 ± 0.000010 [1] |
| Heliocentric radial velocity | 2,319 ± 3 km/s[1] |
| Distance | 79.4 ± 14.5 Mly (24.3 ± 4.4 Mpc)[1] |
| Apparent magnitude (V) | 11.7[2] |
| Characteristics | |
| Type | SB(r)c [1] |
| Apparent size (V) | 4.0′ × 2.5′[1] |
| Other designations | |
| MCG -2-13-42, IRAS 05030-1156, PGC 16716 | |
NGC 1784 is a barred spiral galaxy in the constellation Lepus. The galaxy lies about 80 million light years away from Earth based on redshift independent methods, which means, given its apparent dimensions, that NGC 1784 is approximately 100,000 light years across.[1] Its distance based on redshift is 102 Mly.[1] It was discovered by John Herschel on December 11, 1836.[3]
NGC 1784 has a strong bar with dust lanes and patches. Two spiral arms emerge from the end of the bar and form a nearly complete inner ring. The outer spiral arm of the galaxy consists of low-surface-brightness spiral fragments, which complete up to a quarter of revolution before fading.[4] These arms have many knots. Imaging in the hydrogen line shows the presence of a narrow but bright ring. The hydrogen ring is more prominent at the eastern side of the galaxy. Also, the hydrogen appears wrapped, indicative of an interaction with another galaxy. The total hydrogen mass of the galaxy is estimated to be 1.17×1010 M☉.[5][6]
One supernova has been discovered in NGC 1784, SN 2022xkq. The supernova was discovered on 13 October 2022, and it was classified as photometrically transitional and spectroscopically 91bg-like type Ia supernova. These supernovae are characterised as underluminous and by fast-declining magnitude and are more common in older star populations. The supernova occurred in one of the spiral arms of the galaxy. An unusual feature of SN 2022xkq was its red excess.[7] The supernova was observed by the James Webb Space Telescope in mid infrared.[8]
NGC 1784 is the foremost galaxy of the NGC 1784 Group, which also includes FGC 0523, and HIPASS J0508-13.[9]
- ^ a b c d e f g h i "NASA/IPAC Extragalactic Database". Results for NGC 1784. Retrieved 6 February 2025.
- ^ "Revised NGC Data for NGC 1784". spider.seds.org. Retrieved 30 March 2024.
- ^ Seligman, Courtney. "NGC 1784 (= PGC 16716)". Celestial Atlas. Retrieved 19 November 2018.
- ^ Sandage, A., Bedke, J. (1994), The Carnegie Atlas of Galaxies. Volume I, Carnegie Institution of Washington
- ^ Moore, E. M. (May 1993). "High resolution HI VLA observations of the barred spiral galaxies NGC 1398 and NGC 1784". Bulletin of the American Astronomical Society. 25: 799-800. Bibcode:1993AAS...182.0621B.
- ^ Ratay, D. L.; Gottesman, S. (1 December 2000). "The HI Structure of NGC 1784". Bulletin of the American Astronomical Society. 32: 1452. Bibcode:2000AAS...197.3709R.
- ^ Pearson, Jeniveve; et al. (1 January 2024). "Strong Carbon Features and a Red Early Color in the Underluminous Type Ia SN 2022xkq". The Astrophysical Journal. 960 (1): 29. arXiv:2309.10054. Bibcode:2024ApJ...960...29P. doi:10.3847/1538-4357/ad0153.
- ^ DerKacy, J. M.; et al. (1 February 2024). "JWST MIRI/Medium Resolution Spectrograph (MRS) Observations and Spectral Models of the Underluminous Type Ia Supernova 2022xkq". The Astrophysical Journal. 961 (2): 187. arXiv:2310.09153. Bibcode:2024ApJ...961..187D. doi:10.3847/1538-4357/ad0b7b.
- ^ Makarov, Dmitry; Karachentsev, Igor (21 April 2011). "Galaxy groups and clouds in the local (z~ 0.01) Universe". Monthly Notices of the Royal Astronomical Society. 412 (4): 2498–2520. arXiv:1011.6277. Bibcode:2011MNRAS.412.2498M. doi:10.1111/j.1365-2966.2010.18071.x. S2CID 119194025.