Grus Quartet
| Grus Quartet | |
|---|---|
 | |
| Observation data (Epoch J2000) | |
| Constellation | Grus |
| Right ascension | 23h 18m 12.2s[1] |
| Declination | −42° 21′ 42″[1] |
| Brightest member | NGC 7582[1] |
| Number of galaxies | 4[1] |
| Velocity dispersion | (1571 ± 9) km/s[1] |
| Redshift | 0.005240 ± 0.000030[1] |
| Distance | 18.2 Mpc (59 Mly) |
| Other designations | |
| AM 2315-423 | |
The Grus Quartet is a galaxy cluster in the constellation Grus that includes four interacting spiral galaxies, NGC 7582, NGC 7552, NGC 7590, and NGC 7599.[2][3] A large tidal extension of H I reaches from NGC 7582 to NGC 7552, which is indicative of interactions between the group members,[2] yet NGC 7552 does not have highly disturbed morphology.[4]
Location
[edit]The Grus Quartet can be found to the northeast of Theta Gruis.[5][6] The latter three galaxies occupy an area of sky only 10 arcminutes across and are sometimes referred to as the "Grus Triplet," although all four are part of a larger loose group of galaxies called the IC 1459 Grus Group.[7]
In the same galaxy group with the Grus Quartet lie the galaxies NGC 7496, NGC 7531, NGC 7632, and IC 5325.[8] This group, along with the group centered around IC 1459 form the Grus Cloud, a region of elevated galaxy density. The Grus Cloud, along with the nearby Pavo–Indus Cloud, lies between the Local Supercluster and Pavo–Indus Supercluster.[9]
Characteristics of individual galaxies
[edit]NGC 7552 and NGC 7582 are exhibiting high starburst activity; this is thought to have arisen because of the tidal forces from interacting.[6]
Located on the border of Grus with Piscis Austrinus,[10] the nearby IC 1459 is a peculiar E3 giant elliptical galaxy. It has a fast counterrotating stellar core, and shells and ripples in its outer region.[11] The galaxy has an apparent magnitude of 11.9[12] and is around 80 million light-years distant.[10]
Members
[edit]| Name | Type | Distance (Mly) | Apparent magnitude |
|---|---|---|---|
| NGC 7552 | (R')SB(s)ab | ~61 | +10.6 |
| NGC 7582 | (R'_1)SB(s)ab | ~69 | +10.5 |
| NGC 7590 | S(r?)bc | ~69 | +11.3 |
| NGC 7599 | S(r?)bc | ~63 | +11.5 |
See also
[edit]References
[edit]- 1 2 3 4 5 6 "NED results for object Grus Quartet". NASA/IPAC Extragalactic Database. Archived from the original on 20 March 2024. Retrieved 20 March 2024.
- 1 2 Freeland, E.; Stilp, A.; Wilcots, E. (1 July 2009). "H I Observations of Five Groups of Galaxies". The Astronomical Journal. 138 (1): 295–304. arXiv:0905.3907. Bibcode:2009AJ....138..295F. doi:10.1088/0004-6256/138/1/295. S2CID 15714969.
- ↑ Bakich, Michael E. (2010). 1,001 Celestial Wonders to See Before You Die. New York, New York: Springer Science+Business Media, LLC. p. 334. Bibcode:2010ocws.book.....B. ISBN 978-1-4419-1777-5.
- ↑ Wood, Corey M.; Tremonti, Christy A.; Calzetti, Daniela; Leitherer, Claus; Chisholm, John; Gallagher, John S. (25 July 2015). "Supernova-driven outflows in NGC 7552: a comparison of H α and UV tracers". Monthly Notices of the Royal Astronomical Society. 452 (3): 2712–2730. arXiv:1507.00346. Bibcode:2015MNRAS.452.2712W. doi:10.1093/mnras/stv1471. S2CID 118422451.
- ↑ Bakich, Michael E. (2010). 1,001 Celestial Wonders to See Before You Die. New York, New York: Springer Science+Business Media, LLC. p. 334. ISBN 978-1-4419-1777-5.
- 1 2 Koribalski, Bärbel (1996). "The Grus-Quartet". Retrieved 28 January 2014.
- ↑ O'Meara, Stephen James (2013). Deep Sky Companions: Southern Gems. New York, New York: Cambridge University Press. pp. 418–26. ISBN 978-1-107-01501-2.
- ↑ 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.
- ↑ Fouque, P.; Proust, D.; Quintana, H.; Ramirez, A.; Proust, D.; Quintana, H.; Ramirez, A. (1993). "Dynamics of the Pavo-Indus and Grus Clouds of Galaxies" (PDF). Astronomy and Astrophysics Supplement Series. 100 (3): 493–500. Bibcode:1993A&AS..100..493F.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - 1 2 Streicher, Magda (December 2010). "Grus—An Elegant Starry Bird" (PDF). Deepsky Delights. The Astronomical Society of Southern Africa. pp. 56–59. Retrieved 7 February 2014.
- ↑ Verdoes Kleijn, Gijs A.; van der Marel, Roeland P.; Carollo, C. Marcella; de Zeeuw, P. Tim (2000). "The Black Hole in IC 1459 from Hubble Space Telescope Observations of the Ionized Gas Disk". The Astronomical Journal. 120 (3): 1221–37. arXiv:astro-ph/0003433. Bibcode:2000AJ....120.1221V. doi:10.1086/301524.
- ↑ "IC 1459 – LINER-type Active Galaxy Nucleus". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 7 February 2014.
