4C 11.50

Last updated
4C 11.50
Image of 4C 11.50.png
SDSS image of 4C 11.50
Observation data (J2000.0 epoch)
Constellation Serpens
Right ascension 15h 50m 43.59s [1]
Declination +11° 20′ 47.45″ [1]
Redshift 0.435980 [1]
Heliocentric radial velocity 130,704 km/s [1]
Distance 4.710 Gly
Apparent magnitude  (V)17.23
Characteristics
Type LPQ;blazar Sy1.5 [1]
Size~201,000  ly (61.5  kpc) (estimated) [1]
Other designations
PKS 1548+114, LEDA 2819018, OR +181, 2MASS J15504359+1120475, SDSS J155043.59+112047.4, MC2 1548+114, RX J1550.7+1120, TXS 1548+114, IERS B1548+114, EF B1548+1129 [1]

4C 11.50 known as Q1548+114A, is a radio-loud quasar located in the constellation of Serpens. The redshift of the object is (z) 0.435 [1] and it was first discovered as a double quasar pair by Alan Stockton in July 1974 who found the pair are separated by 2.5 arcseconds with the other quasar located at redshift (z) 1.901. [2] Despite being proposed as a gravitational lens candidate, [3] [4] no second image has been ever detected, [5] and both quasars were later found unrelated to each other based on further spectra studies. [6]

Contents

Description

4C 11.50 is classified to have a compact source. When observed in 1974, it is found to contain a dominate compact component coincident together in the position of the quasar with two other components displaying a steep spectrum. [7] The same year, it was classified as a double source which has a separation of 21 arcseconds from each other in a 170° position angle and a detected component hosting much of 20% of the flux density. [8] There are also presence of outer lobe structures in the quasar containing multiple hot spots with the source itself being categorized as bend at 47° from the positions of the bright components. [9]

New observations made with Very Long Baseline Interferometry (VLBI) and Very Large Array (VLA) found the radio structure of 4C 11.50 as different. On milliarcsecond scales, the nucleus of the source appears as weak without any presence of any extended structures. There are two components, mainly a slight resolved component and a weak feature. Observations on large-scale would find the quasar has a much detailed double-lobed structure and a radio jet that is described as straight, leading towards the southeastern direction from the radio core. However, only two jet knots and the northwestern hot spot feature do exhibit signs of linear polarization. [10]

The host galaxy of 4C 11.50 is classified as a spiral galaxy undergoing strong gravitational interactions based on a two-dimensional fitting model and a presence of a possible tidal arm feature by Hubble Space Telescope observations, making this host quite unusual for any of the radio-loud quasars, predominantly hosted by elliptical galaxies. [11] [12] The V-magnitude of the galaxy is estimated to be -22.78 and it has a total host magnitude of -21.32. There are presence of three other galaxies, located in the west direction from the quasar, forming a packed group with each other. [12] [13]

Variability has been detected in 4C 11.50 with its radio core displaying signs of brightening up. The core can also be classified as having an inverted radio spectrum with the total flux density estimated as approximately 250 mJy, suggesting a structure on milliarcsecond scales might be well be present. [14]

References

  1. 1 2 3 4 5 6 7 8 "NED Search results for 4C 11.50". NASA/IPAC Extragalactic Database. Retrieved 2025-09-20.
  2. ↑ Stockton, Alan (July 1974). "Redshift of a galaxy near 4C11.50". Nature. 250 (5464): 308. Bibcode:1974Natur.250..308S. doi:10.1038/250308a0. ISSN   1476-4687.
  3. ↑ Iovino, A; Shaver, P. A. (September 1986). "Gravitational lensing in the QSO pair Q 1548 + 114 A,B". Astronomy and Astrophysics. 166 (1–2): 119–121. Bibcode:1986A&A...166..119I.
  4. ↑ Gott, J. Richard, III; Gunn, James E. (June 1974). "The Double Quasar 1548+115a,b as a Gravitational Lens". The Astrophysical Journal. 190: L105. Bibcode:1974ApJ...190L.105G. doi: 10.1086/181517 . ISSN   0004-637X.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  5. ↑ A., Shaver, P.; G., Robertson, J. (January 1985). "The close QSO pair Q 1548+114 A, B." Monthly Notices of the Royal Astronomical Society. 212: 15P –20P. Bibcode:1985MNRAS.212P..15S. doi: 10.1093/mnras/212.1.15P . ISSN   0035-8711.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. ↑ Sargent, Wallace L. W.; Steidel, Charles C. (November 1989). "Further spectra of the close QSO pair Q1548 + 114A,B". Publications of the Astronomical Society of the Pacific. 101: 962. Bibcode:1989PASP..101..962S. doi:10.1086/132559. ISSN   0004-6280.
  7. ↑ Argue, A. N.; Ekers, R. D.; Fanaroff, B. L.; Hazard, C.; Ryle, M.; Shakeshaft, J. R.; Stockton, A.; Webster, A. S. (July 1974). "Radio and optical studies of 4C 11.50". Monthly Notices of the Royal Astronomical Society. 168: 1P–6. Bibcode:1974MNRAS.168P...1A. doi: 10.1093/mnras/168.1.1P . ISSN   0035-8711.
  8. ↑ Wills, D.; Cotton, W. D. (1974-04-01). "Radio Observations of the 'Double QSO' 4C 11.50". Monthly Notices of the Royal Astronomical Society. 167 (1): 75P –77P. doi: 10.1093/mnras/167.1.75p . ISSN   0035-8711.
  9. ↑ Rector, Travis A.; Stocke, John T.; Ellingson, Erica (October 1995). "Quasar Radio Morphology and Clustering Environment at z~1/2". The Astronomical Journal. 110: 1492. Bibcode:1995AJ....110.1492R. doi:10.1086/117622. ISSN   0004-6256.
  10. ↑ Hooimeyer, J. R. A.; Schilizzi, R. T.; Miley, G. K.; Barthel, P. D. (July 1992). "The radio structure of extended quasars. II. The radio emission on pc- and kpc-scales". Astronomy and Astrophysics. 261: 25–40. Bibcode:1992A&A...261...25H. ISSN   0004-6361.
  11. ↑ Hamilton, Timothy S.; Casertano, Stefano; Turnshek, David A. (September 2002). "The Luminosity Function of QSO Host Galaxies". The Astrophysical Journal. 576 (1): 61–74. arXiv: astro-ph/0011255 . Bibcode:2002ApJ...576...61H. doi:10.1086/341724. ISSN   0004-637X.
  12. 1 2 Örndahl, E.; Rönnback, J. (2005-10-21). "An optical imaging study of 0.4≤z≤0.8 quasar host galaxies" (PDF). Astronomy & Astrophysics. 443 (1): 61–78. doi:10.1051/0004-6361:20040422. ISSN   0004-6361.
  13. ↑ Márquez, I.; Durret, F.; Petitjean, P. (1999-02-01). "Near infrared observations of quasars with extended ionized envelopes" (PDF). Astronomy and Astrophysics Supplement Series. 135 (1): 83–101. arXiv: astro-ph/9810012 . Bibcode:1999A&AS..135...83M. doi:10.1051/aas:1999163. ISSN   0365-0138.
  14. ↑ D., Barthel, P.; K., Miley, G.; T., Schilizzi, R.; E., Preuss (November 1984). "Compact radio cores in extended quasars". Astronomy and Astrophysics. 140: 399. Bibcode:1984A&A...140..399B. ISSN   0004-6361. Archived from the original on 2023-11-14.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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