Astronomy:4C 73.08

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4C 73.08
HST image of 4C 73.08. Also in the image are galaxies; LEDA 2754266 & LEDA 2754392
Observation data (J2000 epoch)
ConstellationDraco
Right ascension 09h 49m 45.94s[1]
Declination+73° 14′ 23.00″[1]
Redshift0.047280[1]
Helio radial velocity14,174 ± 878 km/s[1]
Distance689.6 ± 7,681.0 Mly (211.44 ± 2,355 Mpc)[1]
Characteristics
TypeFR II NLRG[1]
Size~170,000 ly (52.0 kpc) (estimated)[1]
Other designations
2MASX J09494596+7314232, PGC 28261, VII Zw 292, 8C 0944+734, PBC J0950.0+7315, IVS B0945+734[1]

4C 73.08 is a Fanaroff-Riley Class Type II radio galaxy[2] located in the constellation of Draco. The redshift of the galaxy is (z) 0.047[1] and it was first discovered by U. Stute in 1981.[3] This object has also been said to be classified as a giant radio galaxy. It is also the brightest cluster galaxy of a small galaxy group.[4][5]

Description

4C 73.08 is hosted by an elliptical galaxy.[2] When observed, the radio source of the galaxy is found compact, with known protrusion features extending outwards from both of the radio lobes. The lobes are also connected together by bridges of radio emission. There are also strong detections of radio polarization located at both north and south protrusion extensions of the lobes.[4] The total linear extent of the source is estimated to be 1.7 megaparsecs.[6] A compact radio core is clearly detected based on radio imaging.[7]

New radio observations in 2013 would find 4C 73.08 has a double-lobed structure that is found to contain several components. The hotspot located in the southern component is the brightest known feature while the hotspot in the northern lobe is fainter and also located centrally. Wing-like features are also exhibited by both lobes with ridgelines running in perpendicular direction towards the position of the major axis and curving away from the nucleus's direction. The radio core contains a flat radio spectrum.[8]

A radio jet initially thought as one-sided, is shown to have a symmetrical appearance.[8] The lobes of the source are surrounded by radio emission on megaparsec scales.[9] Studies also found 4C 73.08 is classified as a narrow-line radio galaxy.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "NED Search results for 4C 73.08". https://ned.ipac.caltech.edu/byname?objname=4C+73.08&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  2. ↑ 2.0 2.1 information@eso.org. "Galactic fireflies" (in en). https://www.esahubble.org/images/potw1246a/. 
  3. ↑ Stute, U. (1981). "Die große Radiogalaxie 4C73.08" (in en). Mitteilungen der Astronomischen Gesellschaft Hamburg 52: 150. ISSN 0374-1958. Bibcode: 1981MitAG..52..150S. https://articles.adsabs.harvard.edu/full/1981MitAG..52..150S. 
  4. ↑ 4.0 4.1 Klein, U.; Mack, K. H.; Strom, R.; Wielebinski, R.; Achatz, U. (March 1994). "A high-frequency radio continuum investigation of giant radio galaxies. I. Observations of six objects at 2.8 CM wavelength." (in en). Astronomy and Astrophysics 283: 729–744. ISSN 0004-6361. Bibcode: 1994A&A...283..729K. https://articles.adsabs.harvard.edu/pdf/1994A%26A...283..729K. 
  5. ↑ Chen, R.; Peng, B.; Strom, R. G.; Wei, J. (June 2012). "Group of galaxies around the giant radio galaxy 4C 73.08" (in en). Monthly Notices of the Royal Astronomical Society 422 (4): 3004–3009. doi:10.1111/j.1365-2966.2012.20781.x. ISSN 0035-8711. Bibcode: 2012MNRAS.422.3004C. 
  6. ↑ Saripalli, L.; Patnaik, A. R.; Porcas, R. W.; Graham, D. A. (December 1997). "Nuclear radio emission in megaparsec-size radio galaxies" (in en). Astronomy and Astrophysics 328: 78–82. ISSN 0004-6361. Bibcode: 1997A&A...328...78S. https://articles.adsabs.harvard.edu/pdf/1997A%26A...328...78S. 
  7. ↑ Evans, Daniel A.; Hardcastle, Martin J.; Lee, Julia C.; Kraft, Ralph P.; Worrall, Diana M.; Birkinshaw, Mark; Croston, Judith H. (2008-08-04). "XMM-Newton Observations of the Nuclei of the Radio Galaxies 3C 305, DA 240, and 4C 73.08" (in en). The Astrophysical Journal 688 (2): 844. doi:10.1086/592266. Bibcode: 2008ApJ...688..844E. 
  8. ↑ 8.0 8.1 Strom, R. G.; Chen, R.; Yang, J.; Peng, B. (2013-02-04). "Structure and environment of the giant radio galaxy 4C 73.08". Monthly Notices of the Royal Astronomical Society 430 (3): 2090–2096. doi:10.1093/mnras/stt033. ISSN 1365-2966. https://academic.oup.com/mnras/article/430/3/2090/980917#25981421. 
  9. ↑ Bruni, G; Panessa, F; Bassani, L; Dallacasa, D; Venturi, T; Saripalli, L; Brienza, M; Hernández-García, L et al. (2020-03-19). "Hard X-ray selected giant radio galaxies – II. Morphological evidence of restarted radio activity". Monthly Notices of the Royal Astronomical Society 494 (1): 902–914. doi:10.1093/mnras/staa735. ISSN 0035-8711. https://academic.oup.com/mnras/article/494/1/902/5809979. 
  10. ↑ Ramírez, E. A.; Tadhunter, C. N.; Dicken, D.; Rose, M.; Axon, D.; Sparks, W.; Packham, C. (2014-02-07). "Hubble Space Telescope and Spitzer point-source detection and optical extinction in powerful narrow-line radio galaxies". Monthly Notices of the Royal Astronomical Society 439 (2): 1270–1285. doi:10.1093/mnras/stt2444. ISSN 0035-8711. https://academic.oup.com/mnras/article/439/2/1270/1004253. 




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