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UGC 1922

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UGC 1922
DESI Legacy Surveys image of UGC 1922.
Observation data (J2000 epoch)
ConstellationTriangulum
Right ascension02h 27m 45.84s[1]
Declination+28° 12′ 33.07″[1]
Redshift0.036375[1]
Heliocentric radial velocity10,905 km/s ± 4[1]
Distance513 Mly (157.32 Mpc)[1]
Apparent magnitude (V)13.7[2]
Characteristics
TypeS?[1]
Size~343,000 ly (105.3 kpc) (estimated)[1]
Other designations
IC 226, MCG +05-06-046, 2MASX J02274583+2812332, NVSS J022745+281231, PGC 9373[1]

UGC 1922 also known as IC 226, is a giant spiral galaxy of low surface brightness[3] located in the constellation of Triangulum. The redshift of the galaxy is (z) 0.036[1] and it was first discovered in December 1891, by the Austrian astronomer named Rudolph Spitaler who described it as a faint object with a small bright center.[4] It is part of the galaxy group called LDCE 0163.[3]

Description

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UGC 1922 is a low-surface brightness galaxy shown to contain an active galactic nucleus (AGN) without a disk but has a bulge structure from which x-ray emission has been detected.[5][6] Near ultraviolet emission located along the direction of a broken ring feature towards the north from the galaxy's optical center has also been detected.[7] Other observations also detected the emissions along its own spiral arm in the northeastern direction and also from the compact regions. At 610 MHz frequencies the emission shows an extended feature in the south, while at 1420 MHz frequencies, emission is resolved as a mini-spiral feature. Two massive star forming regions have been found in the northwest direction from the center of the galaxy.[3]

The total global star formation of the galaxy is estimated to be 2.218 Mʘ per year.[8] It also underwent a recent major galaxy merger, based on a study published in 2018, that found there is an irregular feature on the northwest side of its disc.[9] As a whole, the galaxy has an overheated stellar disk with spiral arms depicted as both clumpy and irregular. A supermassive black hole lying inside the center of the galaxy, has been estimated to be 0.39+0.18-0.15 x 106 Mʘ.[8]

A study published in 2003, found the galaxy shows the presence of carbon oxide emission. Based on observations, most of the emission is concentrated within its central bulge region, described as having a bright appearance. The major axis of the emission is also offset, suggesting it is located within the ring region of the central core.[10]

Supernova

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One supernova has been observed in UGC 1922:

References

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  1. ^ a b c d e f g h i "NED Search results for UGC 1922". NASA/IPAC Extragalactic Database. Retrieved 2026-01-20.
  2. ^ "Revised NGC Data for UGC 1922". spider.seds.org. Retrieved 30 March 2024.
  3. ^ a b c Mishra, Alka; Kantharia, N. G.; Das, M.; Srivastava, D. C.; Vogel, S. N. (2015-01-29). "Studying the radio continuum from nuclear activity and star formation in giant low surface brightness galaxies". Monthly Notices of the Royal Astronomical Society. 447 (4): 3649–3663. doi:10.1093/mnras/stu2743. ISSN 1365-2966.
  4. ^ "Index Catalog Objects: IC 200 - 249". cseligman.com. Retrieved 2026-01-20.
  5. ^ Schombert, J. (October 1998). "Active Galactic Nucleus Activity in Giant, Low Surface Brightness Galaxies". The Astronomical Journal. 116 (4): 1650–1656. Bibcode:1998AJ....116.1650S. doi:10.1086/300558. ISSN 0004-6256.
  6. ^ Ramya, S.; Prabhu, T. P.; Das, M. (2011-08-03), "Active galactic nucleus activity and black hole masses in low surface brightness galaxies", Monthly Notices of the Royal Astronomical Society, 418 (2): 789–800, arXiv:1108.0763, Bibcode:2011MNRAS.418..789R, doi:10.1111/j.1365-2966.2011.19530.x
  7. ^ Mishra, A.; Kantharia, N. G.; Das, M.; Omar, A.; Srivastava, D. C. (January 2017). "GMRT H I study of giant low surface brightness galaxies". Monthly Notices of the Royal Astronomical Society. 464 (3): 2741–2751. arXiv:1609.07544. doi:10.1093/mnras/stw2506. ISSN 0035-8711.
  8. ^ a b Saburova, Anna S.; Chilingarian, Igor V.; Kasparova, Anastasia V.; Sil'chenko, Olga K.; Grishin, Kirill A.; Katkov, Ivan Yu; Uklein, Roman I. (May 2021). "Observational insights on the origin of giant low surface brightness galaxies". Monthly Notices of the Royal Astronomical Society. 503 (1): 830–849. Bibcode:2021MNRAS.503..830S. doi:10.1093/mnras/stab374. ISSN 0035-8711.
  9. ^ Saburova, Anna S.; Chilingarian, Igor V.; Katkov, Ivan Yu; Egorov, Oleg V.; Kasparova, Anastasia V.; Khoperskov, Sergey A.; Uklein, Roman I.; Vozyakova, Olga V. (December 2018). "A Malin 1 'cousin' with counter-rotation: internal dynamics and stellar content of the giant low surface brightness galaxy UGC 1922". Monthly Notices of the Royal Astronomical Society. 481 (3): 3534–3547. Bibcode:2018MNRAS.481.3534S. doi:10.1093/mnras/sty2519. ISSN 0035-8711.
  10. ^ O'Neil, K.; Schinnerer, E. (May 2003). "The First CO Map of a Low Surface Brightness Galaxy". The Astrophysical Journal. 588 (2): L81–L84. arXiv:astro-ph/0304021. Bibcode:2003ApJ...588L..81O. doi:10.1086/375631. ISSN 0004-637X.
  11. ^ Mueller, J.; Gunn, J.; Oke, J. (1989). "Supernova 1989S in IC 226". International Astronomical Union Circular (4888): 1. Bibcode:1989IAUC.4888....1M.
  12. ^ "SN 1989S". Transient Name Server. IAU. Retrieved 20 January 2026.
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