Astronomy:IC 4687

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IC 4687
HST image of IC 4687 (center).
Observation data (J2000 epoch)
ConstellationPavo
Right ascension 18h 13m 39.70s
Declination−57° 43′ 30.97″
Redshift0.017345
Helio radial velocity5,200 km/s
Distance253 Mly (76.95 Mpc)
Apparent magnitude (V)0.33
Apparent magnitude (B)0.43
Characteristics
TypeSb, Sd, HI;LIRG
Size70,000 ly (estimated)
Apparent size (V)1.3' x 0.9'
Other designations
ESO 140-IG10, IRAS 18093-5744, PGC 61602, FAIRALL 045

IC 4687 known as IRAS 18093-5744 or F18093-5744, is an Sb spiral galaxy[1] located in the constellation of Pavo. It is located 250 million light years from Earth[2] and was discovered by Royal Harwood Frost on August 1, 1904, who described the object "as brighter middle with magnitude of 14.[3] It has a surface brightness of 12.5.[4]

Characteristics

IC 4687 is classified as a luminous infrared galaxy. It has an infrared-luminosity of 1011.3 LΘ, compatible with a star formation rate of 30 MΘ yr−1.[5] Through it has an energy output dominated by its star formation, the galaxy has a weak active galactic nucleus.[6]

The regions of IC 4687 are also known to contain high amounts of molecular gas surface densities of log ΣH2 (MΘ pc−2) = 2.9 ± 0.2. In additional, the galaxy is known to produce stars at a rapid rate when compared to normal star forming galaxies with the regions having log ΣSFR (MΘ yr−1 kpc−2) = 0.7 ± 0.4. This units are considered ~ 10 factor higher when compared to extreme values of nearby galaxies.[6] Not to mention, IC 4687 has a velocity field mainly controlled by rotation. It also has a defined kinematic center that is synchronous with its nucleus.[7]

IC 4687 forms an interacting galaxy trio with two other galaxies, IC 4686 and IC 4689.[8] Both of these galaxies are located ~ 10 and ~ 20 kiloparsecs away from IC 4687 and are classified as spiral-like with their velocity fields influenced by kinematic and rotation centers.[6] Because of its close merger with IC 4686, a starburst and wolf-raynet galaxy, IC 4687 appears distorted. The Hubble images shows the galaxy has a distorted morphology with interstellar dust and gas apparently obscuring its companion.[9] Not to mention, IC 4687 has large curly tidal tail as a result of the merger.[8] It is possible the weak interaction from IC 4686 might triggered its starburst.[6]

References

  1. ↑ "IC 4687 - spiral galaxy. Description IC 4687". https://kosmoved.ru/get_ngcic.php?ID=IC_4687&lang=eng. 
  2. ↑ "Your NED Search Results". https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=IC+4687&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES. 
  3. ↑ "Index Catalog Objects: IC 4650 - 4699". https://cseligman.com/text/atlas/ic46a.htm#ic4687. 
  4. ↑ "Revised IC Data for IC 4687". https://spider.seds.org/ngc/revngcic.cgi?IC%204687. 
  5. ↑ Pereira-Santaella, M.; Alonso-Herrero, A.; Santos-Lleo, M.; Colina, L.; Jiménez-Bailón, E.; Longinotti, A. L.; Rieke, G. H.; Ward, M. et al. (2011-11-01). "The X-ray emission of local luminous infrared galaxies". Astronomy and Astrophysics 535: A93. doi:10.1051/0004-6361/201117420. ISSN 0004-6361. Bibcode: 2011A&A...535A..93P. https://ui.adsabs.harvard.edu/abs/2011A&A...535A..93P/abstract. 
  6. ↑ 6.0 6.1 6.2 6.3 Pereira-Santaella, M.; Colina, L.; García-Burillo, S.; Planesas, P.; Usero, A.; Alonso-Herrero, A.; Arribas, S.; Cazzoli, S. et al. (2016-02-15). "Sub-kpc star formation law in the local luminous infrared galaxy IC 4687 as seen by ALMA". Astronomy & Astrophysics 587: A44. doi:10.1051/0004-6361/201527693. ISSN 0004-6361. Bibcode: 2016A&A...587A..44P. http://dx.doi.org/10.1051/0004-6361/201527693. 
  7. ↑ Bellocchi, Enrica; Arribas, Santiago; Colina, Luis; Miralles-Caballero, Daniel (2013-08-30). "VLT/VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies: 2D kinematic properties". Astronomy & Astrophysics 557: A59. doi:10.1051/0004-6361/201221019. ISSN 0004-6361. Bibcode: 2013A&A...557A..59B. http://dx.doi.org/10.1051/0004-6361/201221019. 
  8. ↑ 8.0 8.1 "Hubble Interacting Galaxy IC 4687" (in en). https://hubblesite.org/contents/media/images/2008/16/2341-Image.html?news=true. 
  9. ↑ Rich, J. A.; Kewley, L. J.; Dopita, M. A. (2015-12-07). "Galaxy Mergers Drive Shocks: An Integral Field Study of Goals Galaxies". The Astrophysical Journal Supplement Series 221 (2): 28. doi:10.1088/0067-0049/221/2/28. ISSN 1538-4365. Bibcode: 2015ApJS..221...28R. http://dx.doi.org/10.1088/0067-0049/221/2/28. 



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