CGCG 044-046

CGCG 044-046
SDSS image of CGCG 044-046
Observation data (J2000 epoch)
Constellation	Virgo
Right ascension	13h 16m 17.02s [1]
Declination	+07° 02′ 46.91″ [1]
Redshift	0.050246 [1]
Heliocentric radial velocity	15,063 km/s [1]
Distance	722.5 ± 50.6  Mly (221.53 ± 15.51  Mpc) [1]
Apparent magnitude  (B)	14.20 [1]
Characteristics
Type	E+ pec [1]
Size	~430,000  ly (131  kpc) (estimated) [1]
Other designations
2MASX J13161700+0702465, 4C +07.32, CoNFIG 159, PKS B1313+073, PGC 46187 [1]

CGCG 044-046 is a Type-cD galaxy located in the constellation of Virgo. The redshift of the galaxy is (z) 0.050 ^[1] and it was first discovered as an astronomical radio source by astronomers who were conducting the Parkes Catalogue of Radio Sources survey in 1966, where it was identified as PKS 1313+07. ^[2] It is classified as a radio galaxy and is a member of a background galaxy cluster. ^{[3] [4]}

Description

CGCG 044-046 contains a wide-angle tailed source. ^[4] When observed by the Very Long Baseline Array (VLA), it is found to have an asymmetric structure with the tail feature on the eastern side of the source bending at a sharp angle at around 90° upon reaching 130 kiloparsecs from the site of the radio core. When observed on the western side, the tail is shown as bending in a gradual position, then narrowing before subsequently fading away. A radio map also found the tail features appear perpendicular to each other. The eastern knot feature is suggested to be polarized by 20 percent at around 20 centimeters. ^[5]

Further radio imaging made in 1986, has discovered there is a radio jet present in the galaxy connecting between the radio core and the eastern hotspot that is located 70 kiloparsecs away from it. The eastern hotspot is more polarized by around 30 percent compared to the other hotspot located in the western direction. There is also an eastern component present with a rotation measure of 1 rad m^-2. The jet is estimated to have a velocity of 15000 kilometers per seconds. with the kinetic power of 4.7 x 10⁴³ erg s^-1. ^[4] An inner pair of jets are found with a straight appearance reaching 50 kiloparsecs from the core. ^[3]

Supernova

One supernova has been observed in CGCG 044-046: SN 2004bj (Type Ia, mag. 18.3) was discovered by the Lick Observatory Supernova Search (LOSS) on 22 April 2004. ^{[6] [7] [8]}

References

1. "NED Search results for CGCG 044-046". NASA/IPAC Extragalactic Database. Retrieved 2026-03-08.
2. "Accurate Positions Of 644 Radio Sources". Australian Journal of Physics. 19 (5): 649–686. 1966-10-01. doi:10.1071/ph660649. ISSN   0004-9506.
3. Fanaroff, B.; Lal, D. V.; Venturi, T.; Smirnov, O.; Bondi, M.; Thorat, K.; Bester, L.; Jozsa, G.; Kleiner, D. (2021-05-29), A new look at old friends. I. Imaging classical radio galaxies with uGMRT and MeerKAT, arXiv, doi:10.48550/arXiv.2105.11695, arXiv:2105.11695, retrieved 2026-03-08
4. Patnaik, A. R.; Malkan, M. A.; Salter, C. J. (1986-05-01). "Multifrequency observations of the wide-angle tail radio source 1313+073". Monthly Notices of the Royal Astronomical Society. 220 (2): 351–362. doi: 10.1093/mnras/220.2.351 . ISSN   0035-8711.
5. Patnaik, A. R.; Banhatti, D. G.; Subrahmanya, C. R. (1984-12-01). "VLA observations of the wide-angle tailed radio source 1313+073" (PDF). Monthly Notices of the Royal Astronomical Society. 211 (4): 775–781. doi: 10.1093/mnras/211.4.775 . ISSN   0035-8711.
6. Pugh, H.; Li, W. (2004). "Supernovae 2004bj and 2004bk". International Astronomical Union Circular (8329): 1. Bibcode:2004IAUC.8329....1P.
7. Filippenko, A. V.; Desroches, L.; Ganeshalingam, M.; Chornock, R.; Serduke, F. J. D. (2004). "Supernovae 2004ax, 2004aw, 2004bh, 2004bi, 2004bj, and 2004bk". International Astronomical Union Circular (8331): 2. Bibcode:2004IAUC.8331....2F.
8. "SN 2004bj". Transient Name Server. IAU . Retrieved 8 March 2026.

External links

• CGCG 044-046 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images