Wikipedia

IC 1623

IC 1623 is a galaxy merger in the constellation Cetus. The galaxy lies about 250 million light years away from Earth, which means, given its apparent dimensions, that IC 1623 is approximately 115,000 light years across.[1] It was discovered by Lewis Swift on November 19, 1897.[3]

IC 1623
IC 1623 by Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationCetus
Right ascension01h 07m 47.2s[1]
Declination−17° 30′ 25″[1]
Redshift0.020067 ± 0.000077 [1]
Heliocentric radial velocity6,016 ± 23 km/s[1]
Distance254 Mly (78 Mpc)[1]
Apparent magnitude (V)13.9[2]
Characteristics
Apparent size (V)1.5′ × 1.2′[1]
Notable featuresGalaxy merger, luminous infrared galaxy
Other designations
Arp 236, ESO 541-IG 023, VV 114, IRAS 1053-1746, PGC 4007/4008/4009

Characteristics

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IC 1623 by the James Webb Space Telescope. The luminous core of the galaxy merger turns out to be both very bright and highly compact, so much so that diffraction spikes appear atop the galaxy in this image.[4]

IC 1623 consists of two galaxies in the early to mid stages of merger. The nuclei of the two galaxies lie 20 arcseconds apart. The western component (VV 114W) is bright in ultraviolet and optical light[5][6] and hosts a large number of optically luminous young star clusters.[7] The eastern component, VV 114E, is invisible at UV wavelengths and has prominent dust lanes that cover much of the diffuse light of the underlying stellar population at optical wavelengths.[5][6] Beyond 1 μm, VV 114E increasingly becomes the dominant luminosity component of the merger,[5] being the brightest source in mid infrared. The whole galaxy shines bright in infrared and it is characterised as a luminous infrared galaxy, with a total infrared luminosity (LIR) of 5 × 1011 L⊙.[8]

The James Webb Space Telescope (JWST) observed[9] the nucleus of the eastern galaxy in mid-infrared, revealing a northeastern and a southwestern core. The mid-infrared colors of these cores indicate that the northeastern core is associated with a starburst, while the southwestern core is linked to an active galactic nucleus (AGN).[10][11] Spectral line analysis suggests the presence of a rapidly accreting intermediate-mass black hole in the southwestern nucleus, which may evolve into a supermassive black hole.[12] Additionally, JWST identified 40 star-forming regions with a total star formation rate ranging from 0.02 to 6 solar masses per year. There is also significant diffuse emission from filaments, primarily attributed to polycyclic aromatic hydrocarbons heated by the star-forming regions and the underlying stellar population.[10]

References

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  1. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for IC 1623. Retrieved 2024-03-26.
  2. ^ "Revised NGC Data for IC 1623". spider.seds.org. Retrieved 30 March 2024.
  3. ^ Seligman, Courtney. "IC 1623 (= Arp 236)". Celestial Atlas. Retrieved 19 November 2018.
  4. ^ "Webb Explores a Pair of Merging Galaxies | ESA/Webb". esawebb.org. 25 October 2022. Retrieved 9 April 2024.
  5. ^ a b c Knop, R. A.; Soifer, B. T.; Graham, J. R.; Matthews, K.; Sanders, D. B.; Scoville, N. Z. (March 1994). "VV 114, a high infrared luminosity interacting galaxy system". The Astronomical Journal. 107: 920. Bibcode:1994AJ....107..920K. doi:10.1086/116906.
  6. ^ a b Goldader, Jeffrey D.; Meurer, Gerhardt; Heckman, Timothy M.; Seibert, Mark; Sanders, D. B.; Calzetti, Daniela; Steidel, Charles C. (April 2002). "Far-Infrared Galaxies in the Far-Ultraviolet". The Astrophysical Journal. 568 (2): 651–678. arXiv:astro-ph/0112352. Bibcode:2002ApJ...568..651G. doi:10.1086/339165.
  7. ^ Linden, S. T.; Evans, A. S.; Larson, K.; Privon, G. C.; Armus, L.; Rich, J.; Díaz-Santos, T.; Murphy, E. J.; Song, Y.; Barcos-Muñoz, L.; Howell, J.; Charmandaris, V.; Inami, H.; U, V.; Surace, J. A.; Mazzarella, J. M.; Calzetti, D. (1 December 2021). "Massive Star Cluster Formation and Destruction in Luminous Infrared Galaxies in GOALS. II. An ACS/WFC3 Survey of Nearby LIRGs". The Astrophysical Journal. 923 (2): 278. arXiv:2110.03638. Bibcode:2021ApJ...923..278L. doi:10.3847/1538-4357/ac2892.
  8. ^ Sanders, D. B.; Mazzarella, J. M.; Kim, D.-C.; Surace, J. A.; Soifer, B. T. (October 2003). "The IRAS Revised Bright Galaxy Sample". The Astronomical Journal. 126 (4): 1607–1664. arXiv:astro-ph/0306263. Bibcode:2003AJ....126.1607S. doi:10.1086/376841. S2CID 14825701.
  9. ^ "Webb Captures IC 1623 a pair of merging galaxies". www.jameswebbdiscovery.com. Retrieved 2024-05-23.
  10. ^ a b Evans, A. S.; Frayer, D. T.; Charmandaris, Vassilis; Armus, Lee; Inami, Hanae; Surace, Jason; Linden, Sean; Soifer, B. T.; Diaz-Santos, Tanio; Larson, Kirsten L.; Rich, Jeffrey A.; Song, Yiqing; Barcos-Munoz, Loreto; Mazzarella, Joseph M.; Privon, George C.; U, Vivian; Medling, Anne M.; Böker, Torsten; Aalto, Susanne; Iwasawa, Kazushi; Howell, Justin H.; van der Werf, Paul; Appleton, Philip; Bohn, Thomas; Brown, Michael J. I.; Hayward, Christopher C.; Hoshioka, Shunshi; Kemper, Francisca; Lai, Thomas; Law, David; Malkan, Matthew A.; Marshall, Jason; Murphy, Eric J.; Sanders, David; Stierwalt, Sabrina (1 November 2022). "GOALS-JWST: Hidden Star Formation and Extended PAH Emission in the Luminous Infrared Galaxy VV 114". The Astrophysical Journal Letters. 940 (1): L8. arXiv:2208.14507. Bibcode:2022ApJ...940L...8E. doi:10.3847/2041-8213/ac9971.   This article contains quotations from this source, which is available under the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license.
  11. ^ Rich, J.; Aalto, S.; Evans, A. S.; Charmandaris, V.; Privon, G. C.; Lai, T.; Inami, H.; Linden, S.; Armus, L.; Diaz-Santos, T.; Appleton, P.; Barcos-Muñoz, L.; Böker, T.; Larson, K. L.; Law, D. R.; Malkan, M. A.; Medling, A. M.; Song, Y.; U, V.; van der Werf, P.; Bohn, T.; Brown, M. J. I.; Finnerty, L.; Hayward, C.; Howell, J.; Iwasawa, K.; Kemper, F.; Marshall, J.; Mazzarella, J. M.; McKinney, J.; Muller-Sanchez, F.; Murphy, E. J.; Sanders, D.; Soifer, B. T.; Stierwalt, S.; Surace, J. (1 February 2023). "GOALS-JWST: Pulling Back the Curtain on the AGN and Star Formation in VV 114". The Astrophysical Journal Letters. 944 (2): L50. arXiv:2301.02338. Bibcode:2023ApJ...944L..50R. doi:10.3847/2041-8213/acb2b8.
  12. ^ González-Alfonso, Eduardo; García-Bernete, Ismael; Pereira-Santaella, Miguel; Neufeld, David A.; Fischer, Jacqueline; Donnan, Fergus R. (February 2024). "JWST detection of extremely excited outflowing CO and H 2 O in VV 114 E SW: A possible rapidly accreting IMBH". Astronomy & Astrophysics. 682: A182. arXiv:2312.04914. doi:10.1051/0004-6361/202348469.
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