1ES 1741+196
| 1ES 1741+196 | |
|---|---|
| File:Image of 1ES 1741+196.jpg The BL Lac object 1ES 1741+196. | |
| Observation data (J2000.0 epoch) | |
| Constellation | Hercules |
| Right ascension | 17h 43m 57.83s |
| Declination | +19° 35′ 09.01″ |
| Redshift | 0.084000 |
| Heliocentric radial velocity | 25,183 km/s |
| Distance | 1.217 Gly (373.13 Mpc) |
| Apparent magnitude (V) | 16.8 |
| Characteristics | |
| Type | BL Lac |
| Size | 103.65 kiloparsecs (338,100 light-years) (diameter; 2MASS K-band total isophote)[1] |
| Notable features | Low luminosity blazar |
| Other designations | |
| LEDA 1597986, 87GB 174148.7+193615, TXS 1741+196, RX J1743.8+1935, IRCF J174357.8+193509, S3 1741+19, TeV J1743+196 | |
1ES 1741+196 is a BL Lacertae object (BL Lac) located in the constellation of Hercules. It is located 1.2 billion light years from Earth.[1] It was first discovered in 1996 via an Einstein Observatory X-ray satellite.[2][3] Because the galaxy's synchrotron peak is found above 1 keV, it is categorized as a high-frequency peaked object.[4]
Characteristics
[edit | edit source]The nucleus of 1ES 1741+196 is active. It has been classified as an extreme blazar due to having a flat high energy gamma ray spectrum[5] or alternatively, a high-energy BL Lac.[6] One accepted theory for this energy source in most active galactic nuclei is a presence of an accretion disk around its supermassive black hole. The mass of the black hole in the center of the galaxy is estimated to be 8.93 ± 0.70 Mʘ based on a fundamental plane measurement.[7]
Apart from that, 1ES 1741+196 has an isotopic luminosity of ~ 8.2 x 1043 erg s−1, making it less luminous amongst other TeV blazars.[8] When observed in very high energy (VHE) band, 1ES 1741+196 shows no evidence of strong flares.[4] Its X-ray spectrum is known to be variable compared to its steady gamma ray spectrum, with it rising up by a factor of 3 in terms of variability.[5]
The host galaxy of 1ES 1741+196 is an elliptical galaxy, one of the largest and brightest BL Lac host galaxies observed. It has a redshift magnitude relation of -24.85 and a galaxy effective radius of 51.2 kiloparsecs, which its overall luminosity distribution is obtained via a de Vaucouleurs profile. Additionally, there are two galaxy companions within the galaxy's position.[9] They have same redshifts,[10] with projected distances of 7.2 and 25.2 kiloparsecs.[9] Given 1ES 1741+196 has a flat luminosity profile, its position along an impact parameter towards the neighbors and a high ellipticity, this suggests tidal forces. Further evidence also shows a presence of a tidal tail between the companions, indicating the three galaxies are interacting.[9]
1ES 1741+196 has an extended radio jet towards the east direction with a projected position angle of °80.[11][12] The jet is known to be straight despite showing signs of a 5° bend towards south by 15-20 parsecs from its core.[13] Furthermore, the jet is known to be aligned well with a parsec-scale jet.[12]
References
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