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F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
Galaxy in the constellation Cetus
Observation data (J2000.0 epoch )
Cetus
03 h 08 m 26.2s [1]
+04° 06 ′ 39.3″[1]
0.0288[2]
8,485± 15 km/s[3]
8,488± 15 km/s[3]
378,600,000 ly (116.08 Mpc )[1]
[CHM 2007] LDC 223[1]
8.460[3]
12.84[4]
-2.70[3]
1.19× 10 −1 [3]
S0/a [3]
225,400 ly (69.11 kpc) (diameter)[3]
1.147′ × 0.917′[1]
NGC 1218 is a lenticular galaxy in Cetus that hosts the radio source 3C 78. It was discovered in 1886 by American astronomer Lewis A. Swift . It is located at l = 174.86, b = -44.51 in the galactic coordinate system .[1]
History [ edit ]
Discovered by Lewis Swift on September 6, 1886,[5] NGC 1218 was one of the original objects included in the New General Catalogue .[6] 3C 78 was discovered c. 1957 , and subsequently included in the Third Cambridge Catalogue of Radio Sources (3C).[7]
In 1982, it was found that the nucleus of NGC 1218 emits a radio jet .[8] A follow-up study in 1986 corroborated the presence of the jet, as well as finding evidence of a possible weak counter-jet.[9] The Hubble Space Telescope observed NGC 1218 on August 17, 1994. An optical jet of synchrotron radiation similar to that of Messier 87 was subsequently found.[10]
On September 6, 2000, a type Ia supernova was detected in NGC 1218. A 2002 study found that the previously identified radio jet was the cause.[11]
In 2023, the proper motion of 3C 78 was determined using observations from the Very Large Array (VLA), as well as a single observation from the Atacama Large Millimeter/submillimeter Array (ALMA).[12]
Composition and structure [ edit ]
NGC 1218 is a lenticular (S/0a) radio galaxy , with a radio halo roughly equivalent in size to the optical halo's extent.[8] The observable synchrotron jet has a total length of 1.37 arcseconds (0.75 kpc), and expands substantially at 0.5 arcseconds from the nucleus.[10]
NGC 1218 has an approximate hydrogen mass of <36 × 10 9 M ☉ .[9]
3C 78 is an astronomical radio source with an angular extent of approximately 80 × 55 arcseconds squared.[9] According to Tabara and Inoue (1980), 3C 78 has a rotation measure of 8.7 ± 1.9 m −2 and an intrinsic position angle of 87° ± 4°, although Simard-Normandin, Kronberg, and Button (1981) claim that it has a rotation measure of 14 ± 2 m −2 and an intrinsic position angle of 85° ± 3°.[13] [14]
It possesses a radio jet approximately one arcsecond (0.58 kpc) in length, with three bright, compact inhomogeneities (or "knots"), with the second and thirds ones being the most prominent. The second knot has a longitudinal motion of approximately 0.51 ± 0.14c at roughly 200 pc, and the third knot had an apparent superluminal backwards motion of −2.6 ± 2 c prior to 2000, followed by a forward motion of 0.5 ± 2 c , both at roughly 300 pc. [12]
^ There are a total of 76 identifiers used. The NGC, 3C, and CGCG designations are the most common
References [ edit ]
^ a b c d e f g h "Results for object NGC 1218" . NED . Retrieved 2024-04-05 .
^ "NGC 1218 - Lenticular Galaxy in Cetus" . The Sky Live . Retrieved 2024-04-05 .
^ Seligman, Courtney (2020-05-15). "NGC Objects: NGC 1200 - 1249" . cseligman.com . Retrieved 2024-04-10 .
^ Dreyer, J. L. E. (1888). "A New General Catalogue of Nebulæ and Clusters of Stars, being the Catalogue of the late Sir John F. W. Hershel, Bart., revised, corrected, and enlarged" (PDF) . Memoirs of the Royal Astronomical Society . 49 . Royal Astronomical Society : 44. Bibcode :1888MmRAS..49....1D – via Astrophysics Data System .
^ Archer, S.; Baldwin, J. E. ; Edge, D. O.; et al. (1959). Bracewell, Ronald N. (ed.). "Studies of Radio Sources at 159 Mc/s" (PDF) . Paris Symposium on Radio Astronomy . 9 (9 ). Stanford University Press : 487. Bibcode :1959IAUS....9..487A . doi :10.1017/S0074180900051342 . Retrieved 2024-04-18 – via Cambridge Core .
^ a b Unger, S. W.; Booler, R. V.; Pedlar, A. (1983-07-19). "A kiloparsec radio jet in the nucleus of the S0 galaxy NGC 1218 (3C 78)". Monthly Notices of the Royal Astronomical Society . 207 (4 ). Wiley-Blackwell : 679–684. Bibcode :1984MNRAS.207..679U . doi :10.1093/mnras/207.4.679 .
^ a b c Saikia, D. J. ; Subrahmanya, C. R.; Patnaik, A. R.; et al. (1985-07-22). "Radio observations of the S0 galaxy NGC 1218 (3C 78)". Monthly Notices of the Royal Astronomical Society . 219 (3 ). Wiley-Blackwell : 547–548, 552–553. Bibcode :1986MNRAS.219..545S . doi :10.1093/mnras/219.3.545 .
^ a b Sparks, William B.; Golombek, Daniel; Baum, Stefi A.; et al. (1994-12-22). "Discovery of an Optical Synchrotron Jet in 3C 78" (PDF) . The Astrophysical Journal . 450 (2 ). IOP Publishing : L55–L58. Bibcode :1995ApJ...450L..55S . doi :10.1086/316777 . Retrieved 2024-04-09 .
^ Capetti, Alessandro (2002-01-31). "Jet-triggered Type Ia Supernovae in Radio Galaxies?" (PDF) . The Astrophysical Journal . 574 (1 ). IOPScience (published 2002-06-27): L25–L27. arXiv :astro-ph/0205042 . Bibcode :2002ApJ...574L..25C . doi :10.1086/342362 . Retrieved 2024-04-12 .
^ a b Roychowdhury, Agniva; Meyer, Eileen T.; Georgianopoulos, Markos; Kollmann, Kassidy (2023-01-21). "Proper motions in the sub-kiloparsec jet of 3C 78: novel constraints on the physical nature of relativistic jets". Monthly Notices of the Royal Astronomical Society . 527 (4 ). Oxford University Press (published 2023-12-18): 10262–10278. arXiv :2308.00842 . Bibcode :2024MNRAS.52710262R . doi :10.1093/mnras/stad3867 .
^ Simard-Normandin, Martine; Kronberg, Philipp P.; Button, Stuart (1980-04-28). "The Faraday Rotation Measures of Extragalactic Radio Sources" (PDF) . The Astrophysical Journal Supplement Series . 45 . University of Chicago Press : 102. Bibcode :1981ApJS...45...97S . doi :10.1086/190709 . Retrieved 2024-04-17 – via Astrophysics Data System .
^ Tabara, Hiroto; Inoue, Makoto (1979-05-28). "A Catalogue of Linear Polarization of Radio Sources" (PDF) . Astronomy & Astrophysics Supplement Series . 39 . Springer Science+Business Media : 381, 387. Bibcode :1980A&AS...39..379T . Retrieved 2024-04-17 – via Astrophysics Data System .
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=NGC_1218&oldid=1221320322 "
C a t e g o r i e s :
● L e n t i c u l a r g a l a x i e s
● R a d i o g a l a x i e s
● C e t u s
● D i s c o v e r i e s b y L e w i s S w i f t
● G a l a x i e s d i s c o v e r e d i n 1 8 8 6
● N G C o b j e c t s
● 3 C o b j e c t s
● U G C o b j e c t s
● P r i n c i p a l G a l a x i e s C a t a l o g u e o b j e c t s
● L E D A o b j e c t s
● M C G o b j e c t s
H i d d e n c a t e g o r i e s :
● A r t i c l e s w i t h s h o r t d e s c r i p t i o n
● S h o r t d e s c r i p t i o n i s d i f f e r e n t f r o m W i k i d a t a
● T h i s p a g e w a s l a s t e d i t e d o n 2 9 A p r i l 2 0 2 4 , a t 0 6 : 2 4 ( U T C ) .
● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n .
● P r i v a c y p o l i c y
● A b o u t W i k i p e d i a
● D i s c l a i m e r s
● C o n t a c t W i k i p e d i a
● C o d e o f C o n d u c t
● D e v e l o p e r s
● S t a t i s t i c s
● C o o k i e s t a t e m e n t
● M o b i l e v i e w