3C 223 is a radio galaxy listed in the Third Cambridge Catalogue of Radio Sources (3C), which catalogs celestial radio emitters identified in surveys conducted at Cambridge, United Kingdom, during the mid‑20th century. The object is classified as a Fanaroff–Riley type II (FR II) radio source, characterized by edge‑brightened radio lobes and prominent hotspots.
Astronomical data
- Right ascension (J2000): 09 h 51 m 58.6 s
- Declination (J2000): +12° 41′ 13″
- Redshift (z): 0.1368 ± 0.0001 (spectroscopic measurement)
- Host galaxy: An elliptical galaxy identified in optical surveys; the galaxy is sometimes catalogued as PGC 32769.
Observational characteristics
- Radio: The source exhibits a double‑lobed morphology with a linear size of several hundred kiloparsecs. High‑resolution interferometric images (e.g., from the VLA) reveal well‑defined hotspots at the outer edges of the lobes, consistent with FR II classification.
- Optical/infrared: Optical imaging shows the host galaxy to be a luminous elliptical. Spectroscopy displays both narrow and broad emission lines, indicating the presence of an active galactic nucleus (AGN) with a partially obscured broad‑line region.
- X‑ray: The galaxy has been observed with the Chandra X‑ray Observatory and XMM‑Newton. The X‑ray data reveal a central point source associated with the AGN, as well as diffuse emission from the radio lobes, attributed to inverse‑Compton scattering of cosmic microwave background photons.
Scientific relevance
3C 223 is frequently cited in studies of radio‑loud AGN, particularly those investigating the interaction between relativistic jets and the intergalactic medium, the structure of obscuring material around the central engine, and the energetics of inverse‑Compton X‑ray emission.
References
- Third Cambridge Catalogue of Radio Sources, Edge et al., 1959.
- Barthel, D. D. (1989). “Orientation-dependent unification of radio galaxies and quasars.” The Astrophysical Journal, 336, 606‑610.
- Hardcastle, M. J., et al. (2002). “Chandra observations of the X‑ray emission from the lobes of powerful radio galaxies.” Monthly Notices of the Royal Astronomical Society, 334, 417‑425.
All information presented is derived from peer‑reviewed astronomical catalogues and observational studies.
