B2 1116+28

B2 1116+28
SDSS image of B2 1116+28. The edge-on spiral galaxy on the right is LEDA 93620.
Observation data (J2000 epoch)
ConstellationLeo
Right ascension11h 18m 59.36s[1]
Declination+27° 54′ 07.15″[1]
Redshift0.067180[1]
Heliocentric radial velocity20140 ± 40 km/s[1]
Distance967.3 ± 67.8 Mly (296.59 ± 20.78 Mpc)[1]
magnitude (J)11.96[1]
Characteristics
TypeFlat Spectrum Radio Source[1]
Size~347,000 ly (106.4 kpc) (estimated)[1]
Other designations
2MASX J11185938+2754070, 7C 1116+2810, CGCG 156-060, PGC 34617, MCG +05-27-054, NVSS J111859+275409, TXS 1116+281[1]

B2 1116+28 is a radio galaxy located in the constellation of Leo. The redshift of the galaxy is (z) 0.067[1] and it was first discovered by astronomers from a sample of at least 138 galaxies from both the Bologna Sky Survey and Third Cambridge Catalogue of Radio Sources in October 1984.[2] It is classified as a low luminosity radio galaxy.[3]

Description

B2 1116+28 has been categorized as a weak emission-line radio galaxy (WLRG). Its host is described as an ordinary isolated elliptical galaxy with a boxy morphology and has an undisturbed appearance.[4] When observed with the Westerbork Synthesis Radio Telescope, it contains a wide angle tail radio source. The radio core is found resolved with traces of radio emission depicted with low surface brightness and orientated at position angle of 100°.[3] The total luminosity of the core is estimated around 7.16 × 1039 erg s−1.[5] There are presence of two outer radio lobes with a measured spectra indexes of 1.4 ± 0.2.[3]

Further radio observations also detected a presence of a central component with the polarization angle being 88° and a rotation measure of around 7 radii square meter. The radio spectrum of the source is mainly straight between the frequencies ranging from 408 MHz and 10.55 GHz frequencies.[6] There are presence of two radio jets based on arcsecond imaging resolutions, with evidence of a two-sided structure positioned in the same direction like the jets.[7] Evidence also found the main jet is located on the western direction.[8] A study also found detections of polarization, with the eastern lobe being polarized at 15% while the central region is polarized at 8%. Meanwhile, the polarization is the highest in the western lobe, exceeding more than 20%.[6]

An extended emission line region has been detected in B2 1116+28. Based on observations, the region is described to have a circular appearance and is mainly associated with a radio source depicted having evidence of an extended structure in the position angle of 80°.[5]

References

  1. 1 2 3 4 5 6 7 8 9 10 "NED Search results for B2 1116+28". NASA/IPAC Extragalactic Database. Retrieved 2026-04-15.
  2. ↑ Feretti, L.; Giovannini, G.; Gregorini, L.; Parma, P.; Zamorani, G. (October 1984). "Statistical properties of the radio cores in elliptical galaxies". Astronomy and Astrophysics. 139: 55–63. ISSN 0004-6361.
  3. 1 2 3 Parma, P.; Ekers, R. D.; Fanti, R. (March 1985). "High resolution radio observations of low luminosity radio galaxies". Astronomy and Astrophysics Supplement Series. 59: 511–521. ISSN 0365-0138.
  4. ↑ Carrillo, R.; Cruz-González, I.; Guichard, J. (April 1997). "Weak Radio Galaxies. I. Broad-Band Optical Imaging". Revista Mexicana de Astronomia y Astrofisica. 33: 31–57. ISSN 0185-1101.
  5. 1 2 Carrillo, R.; Cruz-González, I.; Guichard, J. (April 1999). "Weak Radio Galaxies. II. Narrow-Band Optical Imaging and Physical Conditions". Revista Mexicana de Astronomia y Astrofisica. 35: 45. ISSN 0185-1101.
  6. 1 2 Gregorini, L.; Klein, U.; Parma, P.; Schlickeiser, R.; Wielebinski, R. (July 1992). "High-frequency radio continuum observations of low-luminosity radio galaxies. I. A sample of sources with angular sizes 4'". Astronomy and Astrophysics Supplement Series. 94: 13–35. ISSN 0365-0138.
  7. ↑ Giovannini, G.; Taylor, G. B.; Feretti, L.; Cotton, W. D.; Lara, L.; Venturi, T. (January 2005). "The Bologna Complete Sample of Nearby Radio Sources". The Astrophysical Journal. 618 (2): 635–648. arXiv:astro-ph/0409624. doi:10.1086/426106. ISSN 0004-637X.
  8. ↑ Morganti, R.; Parma, P.; Capetti, A.; Fanti, R.; de Ruiter, H. R. (October 1997). "Asymmetric depolarization in double low-luminosity radio galaxies". Astronomy and Astrophysics. 326: 919–923. ISSN 0004-6361.
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