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South America Galaxy

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Merging pair of ultraluminous infrared galaxies in the constellation Aquarius
South America Galaxy
The galaxy, as seen by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationAquarius
Right ascension22h 51m 49.2s
Declination−17° 52′ 23″
Redshift0.077750
Heliocentric radial velocity23,309 km/s
Distance1.045 Mly (320.4 Mpc)
Apparent magnitude (B)16.15
Characteristics
TypeLIG
Size90,000 ly (estimated)
Apparent size (V)0.3' x 0.2'
Notable featuresInteracting galaxies
Other designations
LEDA 69877, IRAS 22491-1808, PGC 69877, NVSS J225149-175225

The South America Galaxy, also known as LEDA 69877 and IRAS 22491-1808, is a merging pair of ultraluminous infrared galaxies located in the constellation Aquarius. It is estimated to be 1.045 million light-years from the Milky Way and about 90,000 light-years in diameter. The object is moving away from the Solar System with a calculated radial velocity of approximately 23.300 kilometers per second.

The galaxy got its nickname due to its physical resemblance to the continent of South America. The galaxy was selected as ESA/HUBBLE's picture of the week on 10 June 2013.

In the complex central region of the galaxy, scientists have been able to distinguish two nuclei, remains of the two different galaxies that are currently colliding. IRAS 22491-1808 is among the most luminous of these types of galaxies, and is considered to be mid-way through its merging stage.

According to a study published in 2017, the mass of the molecular gas outflow in IRAS 22491-1808 is estimated to be MH2(hot)~ 6−8 × 10 M⊙. Notable, it also shows lack of polarization.

See also

External links

References

  1. Braito, V.; Franceschini, A.; Della Ceca, R.; Bassani, L.; Cappi, M.; Malaguti, P.; Palumbo, G. G. C.; Persic, M.; Risaliti, G. (2002-02-19). "An XMM-Newton Survey of Ultra-Luminous Infrared Galaxies". arXiv:astro-ph/0202352.
  2. Sanders, D. B.; Mirabel, I. F. (1996-01-01). "Luminous Infrared Galaxies". Annual Review of Astronomy and Astrophysics. 34 (1): 749. Bibcode:1996ARA&A..34..749S. doi:10.1146/annurev.astro.34.1.749. ISSN 0066-4146.
  3. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-07-23.
  4. ^ information@eso.org. "A very bright contortionist". esahubble.org. Retrieved 2024-07-23.
  5. Emonts, B. H. C.; Colina, L.; Piqueras-López, J.; Garcia-Burillo, S.; Pereira-Santaella, M.; Arribas, S.; Labiano, A.; Alonso-Herrero, A. (2017-11-01). "Outflows of hot molecular gas in ultra-luminous infrared galaxies mapped with VLT-SINFONI". Astronomy & Astrophysics. 607: A116. arXiv:1708.09503. Bibcode:2017A&A...607A.116E. doi:10.1051/0004-6361/201731508. ISSN 0004-6361.
  6. Pernechele, C.; Berta, S.; Marconi, A.; Bonoli, C.; Bressan, A.; Franceschini, A.; Fritz, J.; Giro, E. (2003-01-01). "Spectropolarimetric search for hidden active galactic nuclei in four southern ultraluminous infrared galaxies". Monthly Notices of the Royal Astronomical Society. 338 (1): L13–L17. arXiv:astro-ph/0210690. Bibcode:2003MNRAS.338L..13P. doi:10.1046/j.1365-8711.2003.06112.x. ISSN 0035-8711.
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