Galaxy in the constellation Pisces
IC 1481 is a spiral galaxy located in the Pisces constellation. It is located 289 million light years from Earth [ 1] Rudolf Spitaler on October 6, 1891.[ 2] 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] active galactic nucleus (AGN). It is classified as a LINER galaxy.[ 5] [ 6] 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] stellar population of IC 1481 shows a post-starburst signature, which the Balmer lines contain strong absorption.[ 8]
A luminous H2 O 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] 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
^ "Your NED Search Results" . ned.ipac.caltech.edu . Retrieved 2024-09-24 .^ "Index Catalog Objects: IC 1450 - 1499" . cseligman.com . Retrieved 2024-09-24 .^ "Revised IC Data for IC 1481" . spider.seds.org . Retrieved 2024-09-24 .^ a b c d 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 . ^ 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 . ^ 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 . ^ 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 doi :10.3847/1538-4365/aa855a ISSN 0067-0049 . ^ 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 ^ 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 doi :10.1051/0004-6361/201015062 . ISSN 0004-6361 . ^ "SN 2000ey" . Transient Name Server . IAU . Retrieved 25 September 2024 .^ Bishop, David. "Bright Supernovae - 2000, entry for SN 2000ey" . Rochester Astronomy . Retrieved 25 September 2024 .
