GB 1508+5714
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| GB 1508+5714 | |
|---|---|
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| Observation data (J2000.0 epoch) | |
| Constellation | Draco |
| Right ascension | 15h 10m 02.9224s |
| Declination | +57° 02′ 43.376″ |
| Redshift | 4.313733 |
| Heliocentric radial velocity | 1,293,225 km/s |
| Distance | 11.898 Gly |
| Apparent magnitude (V) | 21.38 |
| Apparent magnitude (B) | 22.73 |
| Characteristics | |
| Type | FSRQ |
| Notable features | Radio-selected quasar, blazar |
| Other designations | |
| QSO B1508+572, INTREF 636, GB6 B1508+5714, TXS 1508+572, SDSS J151002.93+570243.6 | |
GB 1508+5714 is an extremely distant blazar[1] located in the constellation of Draco. It has a redshift of (z) 4.30 [2][3][4] and is classified as a radio-loud quasar, first discovered in 1995 by astronomers.[5] The radio spectrum of the source appears as flat, making it a flat-spectrum source but also a bright X-ray source.[6][7]
GB 1508+5714 is variable on the electromagnetic spectrum. It is known to emit a powerful gamma-ray flare in February 2022, detected by the Fermi Gamma-ray Space Telescope, between the 0.1-300 GeV range but its flux is 25 times more brighter.[8][6][9] In additional, GB 1508+5714 also displayed optical flares that was shown on both r and i bands when shown by light curves taken from Zwicky Transient Facility.[10] Prolonged gamma activity was detected as well, showing variable flux on timescales.[11]
Radio imaging by Low-Frequency Array (LOFAR) on arcsecond scales, shows the source of GB 1508+5714 is mainly made up of a compact radio core with a flat spectral index of 0.02 ± 0.01 and two emission regions located both west and east directions of the core.[1] Very long baseline interferometry (VLBI), shows the source to be a core-jet structure instead with the core located northeast and a jet component located in southwest direction, with the southernmost faint feature being identified as a radio lobe.[9]
An X-ray jet was discovered by Chandra X-ray Observatory in 2003 with flux and luminosity values measured as 9.2 × 10−15 erg cm−2 s−1 and 1.6 × 1045 erg s−1 respectively.[12][13][14] Based on observations, the size of the jet is found to have a projected distance of 25 kiloparsecs[14] with the X-ray emission peaking by 2 arcseconds as it reaches southwest from the core. This emission is possibly caused due to relativistic jet particles and cosmic microwave background photons interacting with each other.[13]
References
- 1 2 Kappes, A.; Burd, P. R.; Kadler, M.; Ghisellini, G.; Bonnassieux, E.; Perucho, M.; Brüggen, M.; Cheung, C. C.; Ciardi, B.; Gallo, E.; Haardt, F.; Morabito, L. K.; Sbarrato, T.; Drabent, A.; Harwood, J. (2022-07-01). "Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope". Astronomy & Astrophysics. 663: A44. arXiv:2205.11288. Bibcode:2022A&A...663A..44K. doi:10.1051/0004-6361/202141720. ISSN 0004-6361.
- ↑ Hook, I. M.; McMahon, R. G.; Patnaik, A. R.; Browne, I. W. A.; Wilkinson, P. N.; Irwin, M. J.; Hazard, C. (1995-04-01). "GB 1508+5714 : a radio-loud quasar with Z = 4.30 and the space density of high-redshift, radio-loud quasars". Monthly Notices of the Royal Astronomical Society. 273: L63–L67. arXiv:astro-ph/9502071. Bibcode:1995MNRAS.273L..63H. doi:10.1093/mnras/273.1.L63. ISSN 0035-8711.
- ↑ Frey, S.; Gurvits, L. I.; Kellermann, K. I.; Schilizzi, R. T.; Pauliny-Toth, I. I. K. (1997-09-01). "High resolution radio imaging of the extremely distant quasars 1251-407, 1351-018, 1354-174 and 1508+572". Astronomy and Astrophysics. 325: 511–515. Bibcode:1997A&A...325..511F. ISSN 0004-6361.
- ↑ Titov, Oleg; Frey, Sándor; Melnikov, Alexey; Shu, Fengchun; Xia, Bo; González, Javier; Tercero, Belén; Gurvits, Leonid; de Witt, Aletha; McCallum, Jamie; Kharinov, Mikhail; Zimovsky, Vladimir; Krezinger, Máté (2023-01-24). "Astrometric Apparent Motion of High-redshift Radio Sources". The Astronomical Journal. 165 (2): 69. arXiv:2302.12957. Bibcode:2023AJ....165...69T. doi:10.3847/1538-3881/aca964. ISSN 0004-6256.
- ↑ Hook, I. M.; McMahon, R. G.; Patnaik, A. R.; Browne, I. W. A.; Wilkinson, P. N.; Irwin, M. J.; Hazard, C. (1995-04-01). "GB 1508+5714 : a radio-loud quasar with Z = 4.30 and the space density of high-redshift, radio-loud quasars". Monthly Notices of the Royal Astronomical Society. 273: L63–L67. arXiv:astro-ph/9502071. Bibcode:1995MNRAS.273L..63H. doi:10.1093/mnras/273.1.L63. ISSN 0035-8711.
- 1 2 Gokus, A.; Kreter, M.; Kadler, M.; McBride, F.; Buson, S.; Ojha, R.; Ros, E.; Sinapius, J.; Boettcher, M.; Hodgson, J.; Wilms, J.; Fermi LAT Collaboration (2022-02-01). "Gamma-ray flare of high-redshift blazar GB 1508+5714 detected by Fermi/LAT". The Astronomer's Telegram. 15202: 1. Bibcode:2022ATel15202....1G.
- ↑ Moran, Edward C.; Helfand, David J. (1997-08-01). "The 3–53 keV Spectrum of the Quasar 1508+5714: X-Rays from z = 4.3". The Astrophysical Journal. 484 (2): L95–L98. arXiv:astro-ph/9705141. Bibcode:1997ApJ...484L..95M. doi:10.1086/310787. ISSN 0004-637X.
- ↑ Nesci, Roberto (2022-02-01). "Optical follow-up of GB 1508+5714". The Astronomer's Telegram. 15203: 1. Bibcode:2022ATel15203....1N.
- 1 2 Benke, P.; Gokus, A.; Lisakov, M.; Gurvits, L. I.; Eppel, F.; Heßdörfer, J.; Kadler, M.; Kovalev, Y. Y.; Ros, E. (2024-08-12), "Very-long-baseline interferometry study of the flaring blazar TXS 1508+572 in the early Universe", Astronomy & Astrophysics, 689: A43, arXiv:2406.03135, Bibcode:2024A&A...689A..43B, doi:10.1051/0004-6361/202450153
- ↑ Liao, Neng-Hui; Li, Shang; Sheng, Zhen-Feng; Fan, Yi-Zhong (August 2020). "Detections of Simultaneous Brightening of γ-Ray and Optical Emissions of a Distant Blazar GB 1508+5714 at Redshift 4.3". The Astrophysical Journal Letters. 898 (2): L56. arXiv:2005.04844. Bibcode:2020ApJ...898L..56L. doi:10.3847/2041-8213/aba82e. ISSN 2041-8205.
- ↑ Gokus, Andrea; Böttcher, Markus; Errando, Manel; Kreter, Michael; Heßdörfer, Jonas; Eppel, Florian; Kadler, Matthias; Smith, Paul S.; Benke, Petra; Gurvits, Leonid I.; Kraus, Alex; Lisakov, Mikhail; McBride, Felicia; Ros, Eduardo; Rösch, Florian (October 2024). "A Gamma-Ray Flare from TXS 1508+572: Characterizing the Jet of a z = 4.31 Blazar in the Early Universe". The Astrophysical Journal. 974 (1): 38. arXiv:2406.07635. Bibcode:2024ApJ...974...38G. doi:10.3847/1538-4357/ad6a4e. ISSN 0004-637X.
- ↑ O’Sullivan, S. P.; Gabuzda, D. C.; Gurvits, L. I. (2011-06-13). "Multifrequency polarization properties of 10 quasars on decaparsec scales at z > 3". Monthly Notices of the Royal Astronomical Society. 415 (4): 3049–3064. arXiv:1202.2193. Bibcode:2011MNRAS.415.3049O. doi:10.1111/j.1365-2966.2011.18915.x. ISSN 0035-8711.
- 1 2 Siemiginowska, Aneta; Smith, Randall K.; Aldcroft, Thomas L.; Schwartz, D. A.; Paerels, Frederic; Petric, Andreea O. (2003-10-31). "An X-Ray Jet Discovered by Chandra in the z =4.3 Radio-selected Quasar GB 1508+5714". The Astrophysical Journal. 598 (1): L15–L18. arXiv:astro-ph/0310241. Bibcode:2003ApJ...598L..15S. doi:10.1086/380497. ISSN 0004-637X.
- 1 2 Yuan, W.; Fabian, A. C.; Celotti, A.; Jonker, P. G. (2003-11-01). "Extended X-ray emission in the high-redshift quasar GB 1508+5714 at z= 4.3". Monthly Notices of the Royal Astronomical Society. 346 (1): L7–L10. arXiv:astro-ph/0309318. Bibcode:2003MNRAS.346L...7Y. doi:10.1046/j.1365-2966.2003.07234.x. ISSN 0035-8711.
