Blazar in the constellation Draco
GB 1508+5714 is an extremely distant blazar [ 1] constellation of Draco . It has a redshift of (z) 4.30[ 2] [ 3] quasar , first discovered in 1995 by astronomers .[ 4] radio spectrum of the source appears as flat, making it a flat-spectrum source but also a bright X-ray source.[ 5] [ 6]
Description
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.[ 7] [ 5] [ 8] optical flares that was shown on both r and i bands when shown by light curves taken from Zwicky Transient Facility .[ 9] timescales .[ 10]
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 .[ 8]
An X-ray jet was discovered by Chandra X-ray Observatory in 2003 with flux and luminosity values measured as 9.2 x 10−15 erg cm−2 s−1 and 1.6 x 1045 erg s−1 respectively.[ 11] [ 12] [ 13] kiloparsecs [ 13] 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.[ 12]
References
^ a b 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 . ^ 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 . ^ a b 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 . ^ a b 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 , retrieved 2025-01-12 ^ 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 . ^ a b 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 . ^ a b 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 .
External links
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