Astronomy:4C +74.26

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4C +74.26
The quasar 4C +74.26.
Observation data (J2000.0 epoch)
ConstellationCepheus
Right ascension 20h 42m 37.3080s
Declination+75° 08′ 02.445″
Redshift0.104000
Helio radial velocity31,178 km/s
Distance1.293 Gly
Apparent magnitude (V)14.46
Characteristics
TypeFSRQ
Other designations
S5 2043+349, LEDA 2821908, KUV 20432+7457, INTREF 1036, QSO J2042+7508, TIC 3726873902, MAXI J2042+751

4C +74.26 is a radio-loud quasar[1] located 1.3 billion light-years from Earth in the constellation of Cepheus with a redshift of (z) 0.104.[2][3] First discovered in 1965 by the Fourth Cambridge Survey,[4] its radio source is found to measure 1.6 megaparsecs in size, making the object the largest known source associated with an active galactic nucleus.[5][6]

Description

4C +74.26 is classified a broad-line radio galaxy.[7] Its radio lobes are found to be large with two hotspots located in both northern and southern directions. While the northern hotspot has a low-surface brightness feature, the southern hotspot is found to contain an unresolved southern edge with an offset X-ray counterpart.[5][3] It also contains a one-sided jet with an approximate size of 400 kiloparsecs (kpc), seen by Very-long-baseline interferometry and Very Large Array.[8][9] The host galaxy of 4C +74.26 is a giant elliptical galaxy[5] with a supermassive black hole of 4 billion Mʘ, and a bolometric luminosity of 2 x1046 erg s−1.[10][11][12]

According to an X-ray and optical study on 4C +74.26, it is known to have a complex spectrum. The spectrum of the object shows broad Balmer emission line features reaching full width at half maximum (FWHM) of 7500 km s−1 and a non-stellar continuum. In additional, 4C +74.26 also has narrow forbidden lines[13] and is heavily affected by X-ray absorption caused by both intrinsic and Galactic material.[14]

An observation by the Suzaku satellite in 2008, showed 4C +74.26 was in its highest flux state. During the observations, the brightness of the object increased by 20 percent with its spectra hardening. Its root mean square variability also increased along with energy reaching up to 4 keV. Although a broad iron line is seen, emission isn't required. The best fitted large inner radius of 4C +74.26, indicates either its inner disk has disappeared or not illuminated strongly.[10]

References

  1. ↑ Lohfink, Anne M.; Fabian, Andrew C.; Ballantyne, David R.; Boggs, S. E.; Boorman, Peter; Christensen, F. E.; Craig, W. W.; Farrah, Duncan et al. (2017-05-26). "The X-Ray Reflection Spectrum of the Radio-loud Quasar 4C 74.26". The Astrophysical Journal 841 (2): 80. doi:10.3847/1538-4357/aa6d07. ISSN 0004-637X. Bibcode: 2017ApJ...841...80L. 
  2. ↑ Komossa, Stefanie; Meerschweinchen, Janek (2000-02-01). "X-ray emission/absorption mechanisms of 4 NLSy-1-like AGN and a radio quasar. QSO 0117-2837, RX J0134.3-4258, NGC 4051, Mrk 1298, 4C +74.26". Astronomy and Astrophysics 354: 411–422. ISSN 0004-6361. Bibcode: 2000A&A...354..411K. https://articles.adsabs.harvard.edu/pdf/2000A%26A...354..411K. 
  3. ↑ 3.0 3.1 Erlund, M. C.; Fabian, A. C.; Blundell, Katherine M.; Moss, C.; Ballantyne, D. R. (2007-08-01). "The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission?". Monthly Notices of the Royal Astronomical Society 379 (2): 498–506. doi:10.1111/j.1365-2966.2007.11962.x. ISSN 0035-8711. Bibcode: 2007MNRAS.379..498E. 
  4. ↑ "4C 74.26". http://quasar.square7.ch/fqm/2043+749.html. 
  5. ↑ 5.0 5.1 5.2 Riley, J. M.; Warner, P. J.; Rawlings, Steve; Saunders, Richard; Pooley, G. G.; Eales, S. A. (1989-01-01). "4C 74.26 – the largest radio source associated with a quasar". Monthly Notices of the Royal Astronomical Society 236 (1): 13P–20P. doi:10.1093/mnras/236.1.13P. ISSN 0035-8711. https://articles.adsabs.harvard.edu/pdf/1989MNRAS.236P..13R. 
  6. ↑ Bhatta, G.; Stawarz, Ł.; Markowitz, A.; Balasubramaniam, K.; Zola, S.; Zdziarski, A. A.; Jamrozy, M.; Ostrowski, M. et al. (2018-10-20). "Signatures of the Disk–Jet Coupling in the Broad-line Radio Quasar 4C+74.26". The Astrophysical Journal 866 (2): 132. doi:10.3847/1538-4357/aade9c. ISSN 0004-637X. Bibcode: 2018ApJ...866..132B. 
  7. ↑ Ballantyne, D. R. (2005-10-01). "A complete view of the broad-line radio galaxy 4C +74.26 with XMM-Newton". Monthly Notices of the Royal Astronomical Society 362 (4): 1183–1188. doi:10.1111/j.1365-2966.2005.09345.x. ISSN 0035-8711. Bibcode: 2005MNRAS.362.1183B. 
  8. ↑ M., Riley, J.; J., Warner, P. (September 1990). "A one-sided jet in the giant quasar 4C 74.26" (in en). Monthly Notices of the Royal Astronomical Society 246. ISSN 0035-8711. Bibcode: 1990MNRAS.246P...1R. https://articles.adsabs.harvard.edu/pdf/1990MNRAS.246P...1R. 
  9. ↑ Pearson, T. J.; Blundell, K. M.; Riley, J. M.; Warner, P. J. (1992-11-01). "A jet in the nucleus of the giant quasar 4C 74.26". Monthly Notices of the Royal Astronomical Society 259 (1): 13P–16P. doi:10.1093/mnras/259.1.13P. ISSN 0035-8711. https://academic.oup.com/mnras/article/259/1/13P/1040660. 
  10. ↑ 10.0 10.1 Larsson, J.; Fabian, A. C.; Ballantyne, D. R.; Miniutti, G. (2008-08-11). "Exploring the disc/jet interaction in the radio-loud quasar 4C+74.26 with Suzaku". Monthly Notices of the Royal Astronomical Society 388 (3): 1037–1046. doi:10.1111/j.1365-2966.2008.13497.x. ISSN 0035-8711. Bibcode: 2008MNRAS.388.1037L. 
  11. ↑ Ballantyne, D. R.; Fabian, A. C. (2005-03-07). "Evidence of an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C 74.26". The Astrophysical Journal 622 (2): L97–L100. doi:10.1086/429691. ISSN 0004-637X. Bibcode: 2005ApJ...622L..97B. https://doi.org/10.1086/429691. 
  12. ↑ Tzanavaris, P.; Yaqoob, T.; LaMassa, S.; Yukita, M.; Ptak, A. (2019-10-31). "Broadband X-Ray Constraints on the Accreting Black Hole in Quasar 4C 74.26". The Astrophysical Journal 885 (1): 62. doi:10.3847/1538-4357/ab4282. ISSN 0004-637X. Bibcode: 2019ApJ...885...62T. 
  13. ↑ Brinkmann, W.; Otani, C.; Wagner, S. J.; Siebert, J. (1998-02-01). "X-ray and optical study of the giant radio quasar 4C +74.26". Astronomy and Astrophysics 330: 67–71. ISSN 0004-6361. Bibcode: 1998A&A...330...67B. https://articles.adsabs.harvard.edu/pdf/1998A%26A...330...67B. 
  14. ↑ Gesu, L. Di; Costantini, E. (2016-10-01). "The warm absorber in the radio-loud quasar 4C +74.26" (in en). Astronomy & Astrophysics 594: A88. doi:10.1051/0004-6361/201628670. ISSN 0004-6361. Bibcode: 2016A&A...594A..88D. https://www.aanda.org/articles/aa/pdf/2016/10/aa28670-16.pdf. 



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