NGC 3447 is a barred Magellanic spiral galaxy located in the constellation Leo. Its speed relative to the cosmic microwave background is 1,405 ± 34 km/s, which corresponds to a Hubble distance of 20.7 ± 1.5 Mpc (∼67.5 million ly).[1] It was discovered by the British astronomer John Herschel in 1836.
| NGC 3447 | |
|---|---|
 NGC 3447 (center-right), as seen by the Hubble Space Telescope. UGC 6007 can be seen on the left. | |
| Observation data (J2000 epoch) | |
| Constellation | Leo |
| Right ascension | 10h 53m 24s |
| Declination | +16° 46’ 20” |
| Redshift | 0.003559 |
| Distance | 70 Mly (21.4 Mpc) |
| Apparent magnitude (B) | 14.3 |
| Surface brightness | 25.37 mag/arcsec^2 (3447) and 24.38 mag/arcsec^2 (3447A) |
| Characteristics | |
| Type | SAm (3447) and Im (3447A) |
| Other designations | |
| PGC 32694/32700, UGC 6006/6007, VV 252, IRAS 10507+1702, CGCG 095-058, KPG 255 | |
NGC 3447 shows a broad HI line.[1]
With a surface brightness equal to 15.61 mag/am^2, NGC 3443 is classified as a low surface brightness galaxy (LSB). LSB galaxies are diffuse galaxies with a surface brightness less than one magnitude lower than that of the ambient night sky.[2]
To date, four non-redshift measurements yield a distance of 13.730 ± 9.802 Mpc (∼44.8 million ly),[3] which is slightly outside the range values of Hubble.
NGC 3447A
editNGC 3447A, also known as UGC 6007, is an irregular galaxy in contact with NGC 3447.[1][4] It has roughly the same apparent magnitude, and has a slightly lower surface brightness.[1] Due to gravitational forces, it has become distorted, showing disrupted spiral arms and remnants of its spiral structure, hinting it might have been a spiral galaxy in the past.[5]
Supernova
editThe supernova SN 2012ht (type Ia, mag. 18.6)[6] was discovered in NGC 3447 by Koichi Nishiyama and Fujio Kabashima on December 18, 2012.[7][8]
NGC 3447 group
editNGC 3447 is the largest galaxy in a group of galaxies named after it. The NGC 3447 group includes at least 4 other galaxies: NGC 3447A, NGC 3457, UGC 6022 and UGC 6035.[9]
See also
editExternal links
editReferences
edit- ^ a b c d "By Name | NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 2024-07-21.
- ^ "Revised data from NGC/IC Catalogue by Wolfgang Steinckle from NGC 3400 to 3499". astrovalleyfield.ca. Retrieved 2024-07-21.
- ^ "NED Query Results for NGC 3447". ned.ipac.caltech.edu. Retrieved 2024-07-21.
- ^ Mazzei, P.; Marino, A.; Rampazzo, R.; Plana, H.; Rosado, M.; Arias, L. (2018-02-01). "Galaxy evolution in groups. NGC 3447/NGC 3447A: the odd couple in LGG 225". Astronomy and Astrophysics. 610: A8. arXiv:1710.07474. doi:10.1051/0004-6361/201731182. ISSN 0004-6361.
- ^ information@eso.org. "Defying cosmic convention". www.esahubble.org. Retrieved 2024-07-21.
- ^ Transient Name Server entry for SN 2012ht. Retrieved 23 July 2024.
- ^ dbishopx@gmail.com. "Bright Supernovae - 2012". rochesterastronomy.org. Retrieved 2024-07-21.
- ^ Nishiyama, K.; Kabashima, F.; Yusa, T.; Itagaki, K.; Nakano, S.; Brimacombe, J.; Milisavljevic, D.; Martin, E. O.; Yamanaka, M.; Takaki, K.; Itoh, R.; Ueno, I.; Moritani, Y.; Akitaya, H.; Kawabata, K. S. (2012-12-01). "Supernova 2012ht in NGC 3447 = Psn J10532275+1646349". Central Bureau Electronic Telegrams. 3349: 1.
- ^ Garcia, A. M. (1993-07-01). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. ISSN 0365-0138.