| 3C 196.1 | |
|---|---|
| Radio galaxy 3C 196.1. | |
| Observation data (J2000.0 epoch) | |
| Constellation | Hydra |
| Right ascension | 08h 15m 27.810s |
| Declination | −03° 08′ 26.61″ |
| Redshift | 0.198000 |
| Heliocentric radial velocity | 59,359 km/s |
| Distance | 2.383 Gly |
| Apparent magnitude (V) | 16.94 |
| Apparent magnitude (B) | 18.49 |
| Characteristics | |
| Type | cD |
| Notable features | Radio galaxy of HyMORS type, X-ray cavity |
| Other designations | |
| LEDA 1075766, DA 247, NVSS J081527-030826, PKS 0812-029, 3CR 196.1, 4C -02.35, NRAO 286, TXS 0812-029 | |
3C 196.1 is a low-excitation radio galaxy [1] [2] located in the constellation of Hydra. It has a redshift of 0.198 [3] and was first discovered as an astronomical radio source in 1965. [4] This object resides as the brightest cluster galaxy (BCG) of a cool core galaxy cluster CIZA J0815.4-0308 located at the same redshift, with its source being best described as a HyMOR (Hybrid Morphology Radio Source). [5] [6]
The host galaxy of 3C 196.1 is a type-cD elliptical galaxy confirmed by near-infrared and optical imaging. It is described having an elongated structure from northeast and southwest direction [7] [8] with an estimated angular size of 3.16 kpc arcsec−1. [6] According to optical color gradients of the host galaxy, 3C 196.1 exhibits periodic shells with the centroids of the optical isotopes having a directional shift towards southwest, indicating a merger stage. [5] Furthermore, nucleus of the galaxy is partly obscured by interstellar dust [9] and appears to be split in several patches of emission that is extended along the nucleus' direction. [10]
Radio imaging of 3C 196.1 made by Very Large Array, shows a compact one-sided source within the host galaxy and a secondary nucleus on its side opposite its radio extension, [11] measuring a total size of 16 kpc and an orientation along a position angle of 40°. The southwest side of the galaxy has an enshrouded radio lobe with the region displaying high recessional velocities that is exceeding 500 km s−1 whereas the northwest side is more diffused with a small velocity dispersion. [12]
According to X-ray and radio imaging analysis, 3C 196.1 has a butterfly-shaped X-ray cavity located 10 kpc from its nucleus with the inner and outer cavities having jet power of 1.9 x 1044 erg s−1 and 3.4 x 1044 erg s−1 respectively. The enthalpies of the inner and outer cavities are computed as 7 x 1058 erg and 3 x 1060 erg. [5] Further evidence also shows presence of ionized gas filling up the cavity suggesting either the gas underwent numerous ionization events from AGN outbursts caused by the galaxy or the cooling of AGN outflows (104 < T ≤ 107 K) are causing the gas to form filaments. [8]
3C 449 is a low-redshift Fanaroff and Riley class I radio galaxy. It is thought to contain a highly warped circumnuclear disk surrounding the central active galactic nucleus (AGN). The name signifies that it was the 449th object of the Third Cambridge Catalog of Radio Sources (3C), published in 1959.
3C 305, also known as IC 1065, is a lenticular galaxy located in the constellation Draco. The galaxy is located 577 million light-years away from Earth. It has an active galactic nucleus and is classified as a Seyfert 2 galaxy. This galaxy was discovered by American astronomer Lewis Swift on April 7, 1888.
3C 79 is a Seyfert Galaxy and a radio galaxy located in the constellation Aries. It is hosted by an elliptical galaxy described as elongated with a complex morphology.
3C 285 is a radio galaxy located in the constellation Canes Venatici. It is located about 1 bilion light years away. It is a Fanaroff-Riley 2 radio galaxy and is hosted in a disturbed spiral galaxy.
3C 438 is a Seyfert galaxy and Fanaroff and Riley class II radio galaxy located in the constellation Cygnus. The radio galaxy has two lobes and there is a radio jet leading to the south lobe, which also has a prominent double hot spot. There is age variation across the lobes.
3C 236 is a Fanaroff and Riley Class II radio galaxy. It is among the largest known radio galaxies; the radio structure has a total linear size in excess of 4.5 Mpc. The galaxy features a "double-double" radio morphology consisting of the giant relic 4.5 Mpc source and an inner 2 kpc compact steep spectrum radio source. A recent starburst episode near the nucleus may be related to the event resulting in re-ignition of radio activity.
Hercules A is a bright astronomical radio source in the constellation Hercules corresponding to the galaxy 3C 348.
NGC 3862 is an elliptical galaxy located 300 million light-years away in the constellation Leo. Discovered by astronomer William Herschel on April 27, 1785, NGC 3862 is an outlying member of the Leo Cluster.
NGC 708 is an elliptical galaxy located 240 million light-years away in the constellation Andromeda and was discovered by astronomer William Herschel on September 21, 1786. It is classified as a cD galaxy and is the brightest member of Abell 262. NGC 708 is a weak FR I radio galaxy and is also classified as a type 2 Seyfert galaxy.
NGC 547 is an elliptical galaxy and radio galaxy located in the constellation Cetus. It is located at a distance of about 220 million light years from Earth, which, given its apparent dimensions, means that NGC 547 is about 120,000 light years across. It was discovered by William Herschel on October 1, 1785. It is a member of the Abell 194 galaxy cluster and is included along with NGC 547 in the Atlas of Peculiar Galaxies.
NGC 7237 is an interacting lenticular galaxy located in the constellation Pegasus. It is located at a distance of about 350 million light years from Earth, which, given its apparent dimensions, means that NGC 7237 is about 240,000 light years across. NGC 7237 forms a pair with NGC 7236 and is a radio galaxy. It was discovered by Albert Marth on August 25, 1864.
An extended emission-line region (EELR) is a giant interstellar cloud ionized by the radiation of an active galactic nucleus (AGN) inside a galaxy or photons produced by the shocks associated with the radio jets. An EELR can appear as a resolved cloud in relative nearby galaxies and as narrow emission lines in more distant galaxies.
NGC 5920 is a large lenticular galaxy located in the Serpens constellation. Discovered on March 30, 1887, by American astronomer Lewis Swift, NGC 5920 is 711 million light-years distant from planet Earth. It is a narrow-line radio galaxy and about 300,000 light-years in diameter.
4C+55.16 is an elliptical galaxy, classified type E, located in Ursa Major. The galaxy lies about 2.84 billion light-years from Earth, which means given its apparent dimensions, 4C+55.16 is approximately 445,000 light-years across making it a type-cD galaxy. It is the brightest cluster galaxy (BCG) in a cluster of the same name.
3C 346 is an elliptical galaxy located in the constellation Hercules. It is located nearly 2.5 billion light years away from Earth and classified a Seyfert galaxy and a compact steep-spectrum source (CSS), although later studies confirm it as a Fanaroff-Riley class II source.
3C 459 known as IRAS 23140+0348, is a radio galaxy located in the constellation Pisces. It is located 2.74 billion light years from Earth and is classified as a Seyfert 2 and LINER galaxy.
3C 138 is a quasar located in the constellation of Taurus. It has a redshift of (z) 0.76. The radio spectrum of this source appears both compact and steep, making it a compact steep-spectrum radio quasar. It is also one of the few 3C objects showing a defined and turn-over in its electromagnetic spectrum at low frequencies.
3C 309.1 is a quasar located in the constellation of Ursa Minor. It has a redshift (z) of 0.90 and was first identified as an astronomical radio source from the Third Cambridge Catalogue of Radio Sources by in 1966. This object contains a compact steep spectrum (CSS) source, and is classified as one of the brightest and largest of its kind.
3C 356 is a distant radio galaxy located in the constellation of Draco, hosted by a merging pair of elliptical galaxies located at redshift (z) 1.079 with two radio cores having a separation gap of 5 arcseconds. It was first discovered as an astronomical radio source by P. Veron from a 3C revised catalogue in 1966 and such, shows an alignment effect at both wavelengths. The X-ray source luminosity for this galaxy is estimated to be 2.5 x 1044 erg s−1.
3C 382 is a nearby broad-line radio galaxy located in the constellation of Lyra, located at a redshift of (z) 0.058. First discovered as an astronomical radio source in 1963 and identified with its optical counterpart in 1973, the galaxy is classified as a Fanaroff-Riley class II radio galaxy. Its X-ray luminosity is estimated to be 7×1044 erg/s in the 0.2–2.4 keV band.