IC 1481

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IC 1481
IC1481 - SDSS DR14.jpg
IC 1481 captured by SDSS
Observation data (J2000 epoch)
Constellation Pisces
Right ascension 23h 19m 25.1234s
Declination +05° 54′ 22.243″
Redshift 0.020331
Heliocentric radial velocity 6,095 km/s
Distance 289 Mly (88.60 Mpc)
Apparent magnitude  (V)0.25
Apparent magnitude  (B)0.33
Characteristics
Type Sb, LINER
Size65,000 ly
Apparent size  (V)0.8' x 0.7'
Other designations
IRAS 23168+0537, UGC 12505, PGC 71070, CGCG 406-064

IC 1481 is a spiral galaxy located in the Pisces constellation. It is located 289 million light years from Earth [1] and was discovered by Austrian astronomer, Rudolf Spitaler on October 6, 1891. [2] The galaxy has an approximate diameter of 65,000 light years with a surface brightness of 12.8 square arcmin. [3]

According to an optical image, IC 1481 has an Sb morphological classification. [4] The galaxy also contains an active galactic nucleus (AGN). It is classified as a LINER galaxy. [5] [6] showing an extensive narrow-line region. The region of IC 1481 has bright portions forming in a figure eight pattern and extends at Position Angle (PA) = 50° by ~ 13 arcseconds on both sides of its nucleus. It also show emission knots towards the field edges. [7] The stellar population of IC 1481 shows a post-starburst signature, which the Balmer lines contain strong absorption. [8]

A luminous H2O maser emission is found towards IC 1481. The spectrum of the maser has a narrow and strong feature of 0.15 Jy and FWHM = 2 km s−1. It is also weak and broad. With an isotropic luminosity of L = 320 LΘ, this suggests a megamaser. [4]

The maser features are found distributed, which they contain a velocity gradient. This suggests the AGN of IC 1481 has an unstable molecular gas disk with a mass of (4.3 ± 0.3) x 107 MΘ. The disk is seen edge-on. It has a thickness of 2H = 1.5-4.2 pc and a radius of r = 2.8-14.0 pc making the largest amongst other maser disks observed in other AGNs. Not to mention, the disk has a rotation of Vrot = 124–168 km s−1 and a velocity dispersion measured by △V ≈ 31 km s−1. Further observations found the disk of IC 1481 is huge indicated by its rotation curve being a sub-Keplerian. [4] When compared to the galaxy's black hole mass of <107 MΘ, its mass is higher. [4] [9]

One supernova has been observed in IC 1481: SN 2000ey (type Ia, mag. 16.2). [10] [11]

References

  1. ↑ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-09-24.
  2. ↑ "Index Catalog Objects: IC 1450 - 1499". cseligman.com. Retrieved 2024-09-24.
  3. ↑ "Revised IC Data for IC 1481". spider.seds.org. Retrieved 2024-09-24.
  4. 1 2 3 4 Mamyoda, Koichi; Nakai, Naomasa; Yamauchi, Aya; Diamond, Philip; HurÉ, Jean-Marc (2009-10-25). "Detection of a Sub-Keplerian Water Maser Disk at the Active Galactic Nucleus of the Galaxy IC 1481". Publications of the Astronomical Society of Japan. 61 (5): 1143–1151. doi:10.1093/pasj/61.5.1143. ISSN   2053-051X.
  5. ↑ Bennert, N.; Schulz, H.; Henkel, C. (2004-05-01). "Spectral characteristics of water megamaser galaxies. II. ESO 103-G035, TXS 2226-184, and IC 1481". Astronomy and Astrophysics. 419: 127–137. arXiv: astro-ph/0403247 . Bibcode:2004A&A...419..127B. doi:10.1051/0004-6361:20034497. ISSN   0004-6361.
  6. ↑ Huchra, J.P.; Wyatt, W.F.; Davis, M. (1982). "New Seyfert Bright Galaxies". The Astronomical Journal. 87: 1628. Bibcode:1982AJ.....87.1628H. doi:10.1086/113254 . Retrieved 2024-09-24.
  7. ↑ Thomas, Adam D.; Dopita, Michael A.; Shastri, Prajval; Davies, Rebecca; Hampton, Elise; Kewley, Lisa; Banfield, Julie; Groves, Brent; James, Bethan L.; Jin, Chichuan; Juneau, Stéphanie; Kharb, Preeti; Sairam, Lalitha; Scharwächter, Julia; Shalima, P. (2017-09-01). "Probing the Physics of Narrow-line Regions in Active Galaxies. IV. Full Data Release of the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)". The Astrophysical Journal Supplement Series. 232 (1): 11. arXiv: 1708.02683 . Bibcode:2017ApJS..232...11T. doi: 10.3847/1538-4365/aa855a . ISSN   0067-0049.
  8. ↑ C Keel, William; Moiseev, Alexei; Kozlova, DV (2022). "The TELPERION survey for distant [O iii] clouds around luminous and hibernating AGN". Oxford Academic. 510 (3): 4608–4625. arXiv: 2112.07084 . doi: 10.1093/mnras/stab3656 .
  9. ↑ Huré, J.-M.; Hersant, F.; Surville, C.; Nakai, N.; Jacq, T. (2011-06-01). "AGN disks and black holes on the weighting scales". Astronomy & Astrophysics. 530: A145. arXiv: 1104.2457 . Bibcode:2011A&A...530A.145H. doi:10.1051/0004-6361/201015062. ISSN   0004-6361.
  10. ↑ "SN 2000ey". Transient Name Server. IAU . Retrieved 25 September 2024.
  11. ↑ Bishop, David. "Bright Supernovae - 2000, entry for SN 2000ey". Rochester Astronomy. Retrieved 25 September 2024.
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