IC 711

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IC 711
IC711 - SDSS DR14.jpg
The elliptical galaxy IC 711
Observation data (J2000 epoch)
Constellation Ursa Major
Right ascension 11h 34m 46.55s [1]
Declination +48° 57′ 21.93″ [1]
Redshift 0.031567 [1]
Heliocentric radial velocity 9,464 km/s ± 3 [1]
Distance 521 Mly (160 Mpc) [1]
Group or cluster Abell 1314
Apparent magnitude  (V)14.1 [2]
Characteristics
Type E? [1]
Size~129,000  ly (39.5  kpc) (estimated) [1]
Other designations
CGCG 242-053, MCG +08-21-062, PGC 35780, NSA 038413, WBL 339-003, NVSS J113446+485720, 2MASX J11344658+4857217 [1]

IC 711 is an elliptical galaxy located in the constellation of Ursa Major. The redshift of the galaxy is (z) 0.031 [1] and it was first discovered by an American astronomer named Lewis Swift on May 11, 1890, who described it as ordinary elliptical when viewed in visible light. [3] It is also a member of the galaxy cluster, Abell 1314, which also includes the galaxies; IC 708, IC 709 and IC 712. [4]

Contents

Description

IC 711 is categorized as a narrow angle tail (NAT) radio galaxy [5] that hosts a head-tail radio source that is found to be associated with it along with IC 708. [4] [6] When observed in 1987, it is found to display a radio tail structure that extents outwards from its nucleus with a wide distance of around 930 kiloparsecs, thus making this the longest known of this type. [7] [8] [9] There is also a radio head feature that has signs of a major polarization peak; this suggests depolarization. From the head along the tail, the spectra index between 0.6 and 1.4 GHz frequencies, is found to increase although the spectra does remain constant in some areas of the source. [10]

Further observations made in 2020, have shown the spectral index for the head feature is mainly flat between the frequencies of 240 and 1300 MHz, with Very Large Array showing the approximate flux density is 25.92 ± 0.03 when observed at 1.5 GHz, 24.30 ± 0.02 at 4.5 GHz and even 23.23 ± 0.01 at around 7.5 GHz. There are also twin-sided jets present in the galaxy, depicted having an asymmetric appearance in the innermost regions. Evidence also found the tail feature is mainly straight, showing at least two bends. The tail spectrum increasing becomes more steep as the distance from the head feature increases until it reaches the end points of the tail. [4]

References

  1. 1 2 3 4 5 6 7 8 9 "NED Search results for IC 711". NASA/IPAC Extragalactic Database. Retrieved 2025-12-28.
  2. ↑ "Revised IC Data for IC 711". spider.seds.org. Retrieved 30 March 2024.
  3. ↑ "Index Catalog Objects: IC 700 - 749". cseligman.com. Retrieved 2025-12-28.
  4. 1 2 3 Srivastava, Shweta; Singal, Ashok K (2020-02-21). "GMRT observations of IC 711 – the longest head-tail radio galaxy known". Monthly Notices of the Royal Astronomical Society. 493 (3): 3811–3824. doi: 10.1093/mnras/staa520 . ISSN   0035-8711.
  5. ↑ Wilber, A.; Brüggen, M.; Bonafede, A.; Rafferty, D.; Shimwell, T. W.; Weeren, R. J. van; Akamatsu, H.; Botteon, A.; Savini, F.; Intema, H.; Heino, L.; Cuciti, V.; Cassano, R.; Brunetti, G.; Röttgering, H. J. A. (2019-02-01). "Evolutionary phases of merging clusters as seen by LOFAR". Astronomy & Astrophysics. 622: A25. arXiv: 1811.07929 . Bibcode:2019A&A...622A..25W. doi:10.1051/0004-6361/201833884. ISSN   0004-6361.
  6. ↑ Vallee, J. P.; Wilson, A. S. (February 1976). "Head-tail radio sources in the cluster of galaxies Abell 1314". Nature. 259 (5543): 451–454. Bibcode:1976Natur.259..451V. doi:10.1038/259451a0. ISSN   0028-0836.
  7. ↑ Vallee, J. P.; Roger, R. S. (July 1987). "IC711--The Longest Head-Tail Galaxy Known". The Astronomical Journal. 94: 1. Bibcode:1987AJ.....94....1V. doi:10.1086/114439. ISSN   0004-6256.
  8. ↑ Vallee, J. P.; Strom, R. G. (May 1988). "The 1Mpc Giant Radio Galaxy IC 711: 3km Westerbork Observations at Lambda 92 CM". The Astronomical Journal. 95: 1360. Bibcode:1988AJ.....95.1360V. doi:10.1086/114732. ISSN   0004-6256.
  9. ↑ Vallee, J. P. (November 1988). "The 1-MEGAPARSEC Giant Head / Tail Radio Galaxy IC711 - 3-DIMENSIONAL Simulation and Additional Constraints on the Ram Pressure Theory". Astrophysics and Space Science. 149 (2): 225–231. Bibcode:1988Ap&SS.149..225V. doi:10.1007/BF00639792. ISSN   0004-640X.
  10. ↑ Jaegers, W. J. (December 1987). "O.6 GHz mapping of extended radio galaxies. III. 3C 66B, NGC 1265, 3C129, DA 240, 3C 236, 4C 48.29, IC 708, IC 711, 4CT 51.29.1, 3C 310, Abell 2256, 3C 402 and 3C 465". Astronomy and Astrophysics Supplement Series. 71: 603–642. ISSN   0365-0138.
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