IC 1689

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IC 1689
IC 1689 SDSS.jpg
SDSS image of IC 1689.
Observation data (J2000 epoch)
Constellation Pisces
Right ascension 01h 23m 47.87s [1]
Declination +33° 03′ 19.16″ [1]
Redshift 0.015231 [1]
Heliocentric radial velocity 4,566 km/s ± 7 [1]
Distance 215 Mly (65.97 Mpc) [1]
Apparent magnitude  (V)13.8 [2]
Characteristics
Type S0? LINER [1]
Size~70,800  ly (21.72  kpc) (estimated) [1]
Other designations
AGC 110989, 2MASX J01234783+3303192, CGCG 502-070, PGC 5108, MCG +05-04-046, NSA 129371, PRC B-03, WBL 038-017 [1]

IC 1689 is a lenticular galaxy located in the constellation of Pisces. The redshift of the galaxy is (z) 0.015 [1] and it was first discovered by the French astronomer named Stephane Javelle in December 1899, who described it as a faint object with a bright central nucleus. [3] This galaxy has also been described as a polar ring galaxy. [4] [5] [6]

Contents

Description

IC 1689 is categorized as a normal lenticular galaxy with a type S0 morphology. [7] [8] The galaxy has a peculiar appearance, with a clumpy structure that is located on its outer regions. The ring structure of the galaxy is, however, found to be small, while the central region is depicted to have a boxy-like appearance. The disk of the galaxy is also wrapped with the position angles somehow shifted by about 11°. The ring is symmetrical, while the surface brightness decreases at a steep side on the inner border and at a flat side on the outer border. The inner ring has a radius of about 1.2 kiloparsecs, while the outer ring is about 3.2 kiloparsecs. [9]

A study published in 1996, has found IC 1689 contains an active central nucleus displaying low ionization spectral line emission that is extended from it. As the gas from its disk is weakly accreted into its nucleus, the galaxy is said to be classified as a LINER galaxy. Further evidence also finds the star formation only occurs in the outer regions of the disk. [8] Hydrogen-alpha emission is present, mainly being concentrated in at least two regions, with ionized nitrogen emission detected inside the central region, indicating there is a rotating gaseous disk in a plane perpendicular to the galaxy's main plane. [10] A magnesium line has also been detected, located in both the nucleus region and the radius region by 5.5 arcseconds where the ring feature is crossing the major axis. [5]

IC 1689 is a member of the NGC 507 group. Known as LGG 26, the group comprises multiple galaxies, including NGC 507, IC 1687, IC 1690, NGC 501, NGC 512, NGC 528, NGC 523, NGC 483, NGC 536, NGC 587, NGC 591, Markarian 980, NGC 608, NGC 531, NGC 542, UGC 937, UGC 987, PGC 5100 and IC 1666. [11]

References

  1. 1 2 3 4 5 6 7 8 9 "NED Search results for IC 1689". NASA/IPAC Extragalactic Database. Retrieved 2026-01-03.
  2. ↑ "Revised IC Data for IC 1689". spider.seds.org. Retrieved 2024-03-30.
  3. ↑ "Index Catalog Objects: IC 1650 - 1699". cseligman.com. Retrieved 2026-01-03.
  4. ↑ van Gorkom, J. H.; Schechter, Paul L.; Kristian, Jerome (March 1987). "H i Maps of S0 Galaxies with Polar Rings". The Astrophysical Journal. 314: 457. doi:10.1086/165078. ISSN   0004-637X.
  5. 1 2 Sil'chenko, O. K. (February 1998). "Central regions of the polar-ring galaxies NGC 2685 and IC 1689". Astronomy and Astrophysics. 330: 412–418. ISSN   0004-6361.
  6. ↑ Cox, A. L.; Sparke, L. S. (November 2004). "Radio Continuum Emission in Polar Ring Galaxies". The Astronomical Journal. 128 (5): 2013–2021. doi:10.1086/424613. ISSN   0004-6256.
  7. ↑ van Driel, W.; Arnaboldi, M.; Combes, F.; Sparke, L. S. (February 2000). "A neutral hydrogen survey of polar ring galaxies. III. Nançay observations and comparison with published data" (PDF). Astronomy and Astrophysics Supplement Series. 141: 385–408. doi:10.1051/aas:2000321. ISSN   0365-0138.
  8. 1 2 Hagen-Thorn, V. A.; Reshetnikov, V. P. (March 1997). "IC 1689: S0 galaxy with inner polar disk". Astronomy and Astrophysics. 319: 430–434. ISSN   0004-6361.
  9. ↑ Reshetnikov, V. P.; Hagen-Thorn, V. A.; Yakovleva, V. A. (November 1995). "Photometric study of polar-ring galaxies. II. IC 1689". Astronomy and Astrophysics. 303: 398. ISSN   0004-6361.
  10. ↑ Hagen-Thorn, V. A.; Reshetnikov, V. P. (September 1996). "Spectroscopic observations of IC 1689--a galaxy with an inner polar ring". Astronomy Letters. 22 (5): 677–679. ISSN   0320-0108.
  11. ↑ Garcia, A. M. (July 1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47–90. ISSN   0365-0138.
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