QSO B0738+313
| QSO B0738+313 | |
|---|---|
.png) QSO B0728+313 imaged by SDSS. | |
| Observation data (J2000.0 epoch) | |
| Constellation | Gemini |
| Right ascension | 07h 41m 10.70s[1] |
| Declination | +31° 12′ 00.22″[1] |
| Redshift | 0.630995[1] |
| Heliocentric radial velocity | 189,186 km/s[1] |
| Distance | 5.729 Gly |
| Apparent magnitude (V) | 16.89 |
| Apparent magnitude (B) | 17.02 |
| Characteristics | |
| Type | Opt.var; LPQ Sy1 |
| Other designations | |
| SDSS J074110.70+311200.2, 2MASS J07411070+3112002, KODIAQ J074110+311200, OI +363, NVSS J074110+311200, CRATES J0741+3112, TXS 0738+313, CoNFIG 005, IERS B0738+313, WMAP 107[1] | |
QSO B0738+313 or B2 0738+313, is a quasar located in the constellation of Gemini. It has a redshift of (z) 0.630[1] and it was first discovered as an astronomical radio source in 1968 by astronomers who designated it as OI 363.[2] The object has a radio spectrum appearing as flat making it a flat spectrum radio source but also a gigahertz-peaked spectrum source.[3][4]
Description
[edit]QSO B0738+313 is classified as a core-dominated radio-loud quasar with an X-ray luminosity of L0.1-10 KeV ~ 45 erg s-1. However, the polarization level of the object is low.[5][6] When observed by astronomers during R-band monitoring for four nights, its light curve was described as clear and almost sinusoidal with a few variations occurring on 21 January and 22 December 2006.[5] In its spectrum, the quasar displays two dampened Lyman-alpha absorption-line systems located at redshifts of (z) 0.0912 and (z) 0.2212, making these the lowest known absorption-line systems of its kind.[7][8] Two other faint companions were found, although not relating to the quasar.[9][10]
The quasar has a compact radio structure. When imaged with the Very Long Baseline Array at 15 GHz, it has two strong components. The first component is found weakly polarized at 0.5% with an inverted spectrum, while the other is polarized by around 1.5%. There are also weak and diffused radio lobes on each side of a much stronger radio component.[4] Very Long Baseline Interferometry imaging at six centimeters showed the structure has an unresolved radio core, a small surface brightness radio emission surrounding the source and a jet located in north-south which extends by 5 milliarcseconds.[11] This jet also displays a sharp bend at 45° towards the south-west direction with a knot at its bend.[6][12]
X-ray jet
[edit]An X-ray jet was discovered in QSO B0738+313 by Chandra X-ray observatory in March 2003.[6][13] Based on results, the X-ray jet has an extent of 200 kiloparsecs and is narrow. Observations also showed the X-ray jet is curving as well, which then follows the path of a radio structure south of the quasar and terminating at a hotspot located within the southernmost part of a radio lobe.[6] As it moves further from the core, the jet emission becomes fainter.[14] Astronomers found the X-ray emission is centered strongly towards the jet's direction, 3.8 arcseconds south from the radio core suggesting location of innermost components of the jet.[6]
References
[edit]- ^ a b c d e f "NED search results for QSO B0738+313". NASA/IPAC Extragalactic Database. Retrieved 2025-06-29.
- ^ Thompson, J. R.; Kraus, J. D.; Andrew, B. H. (October 1968). "Optical Identifications of Ohio Radio Sources with Peculiar Spectra". The Astrophysical Journal. 154: L1. doi:10.1086/180255. ISSN 0004-637X.
- ^ Andrew, B. H.; Kraus, J. D. (January 1970). "Radio Sources with Flat Spectra". The Astrophysical Journal. 159: L45 – L50. doi:10.1086/180475. ISSN 0004-637X.
- ^ a b Stanghellini, C.; Dallacasa, D.; O'Dea, C. P.; Baum, S. A.; Fanti, R.; Fanti, C. (2001-10-01). "VLBA observations of GHz-Peaked-Spectrum radio sources at 15 GHz" (PDF). Astronomy & Astrophysics. 377 (2): 377–388. doi:10.1051/0004-6361:20011101. ISSN 0004-6361.
- ^ a b Goyal, A.; Gopal-Krishna; Wiita, P. J.; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Joshi, S. (August 2012). "Intra-night optical variability of core dominated radio quasars: the role of optical polarization". Astronomy and Astrophysics. 544: A37. arXiv:1205.2324. doi:10.1051/0004-6361/201218888. ISSN 0004-6361.
- ^ a b c d e Siemiginowska, Aneta; Stanghellini, Carlo; Brunetti, Gianfranco; Fiore, Fabrizio; Aldcroft, Thomas L.; Bechtold, Jill; Elvis, Martin; Murray, Stephen S.; Antonelli, L. A.; Colafrancesco, S. (October 2003). "Chandra Discovery of an X‐Ray Jet and Extended X‐Ray Structure in the z = 0.63 Quasar B2 0738+313". The Astrophysical Journal. 595 (2): 643–655. arXiv:astro-ph/0306129. doi:10.1086/377369. ISSN 0004-637X.
- ^ Lane, W. M.; Briggs, F. H.; Smette, A. (March 2000). "Detection of Warm and Cold Phases of the Neutral ISM in a Damped Lyα Absorber". The Astrophysical Journal. 532 (1): 146–151. arXiv:astro-ph/9911142. doi:10.1086/308578. ISSN 0004-637X.
- ^ Rao, Sandhya M.; Turnshek, David A. (June 1998). "Discovery of z = 0.0912 and z = 0.2212 Damped Lyα Absorption-Line Systems Toward the Quasar OI 363: Limits on the Nature of Damped Lyα Galaxies". The Astrophysical Journal. 500 (2): L115 – L119. arXiv:astro-ph/9805093. doi:10.1086/311411. ISSN 0004-637X.
- ^ Hutchings, J. B. (October 1992). "[O II]and Continuum Structure in Radio-Loud QSOs to Z = 0.9". The Astronomical Journal. 104: 1311. doi:10.1086/116320. ISSN 0004-6256.
- ^ Torniainen, I.; Tornikoski, M.; Teräsranta, H.; Aller, M. F.; Aller, H. D. (June 2005). "Long term variability of gigahertz-peaked spectrum sources and candidates" (PDF). Astronomy and Astrophysics. 435 (3): 839–856. doi:10.1051/0004-6361:20041886. ISSN 0004-6361.
- ^ Stanghellini, C.; O'Dea, C. P.; Baum, S. A.; Dallacasa, D.; Fanti, R.; Fanti, C. (September 1997). "A VLBI study of GHz-peaked-spectrum radio sources. I. VLBI images at 6cm". Astronomy and Astrophysics. 325: 943–953. ISSN 0004-6361.
- ^ Kellermann, K. I.; Vermeulen, R. C.; Zensus, J. A.; Cohen, M. H. (April 1998). "Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei". The Astronomical Journal. 115 (4): 1295–1318. arXiv:astro-ph/9801010. doi:10.1086/300308. ISSN 0004-6256.
- ^ Siemiginowska, Aneta; Stanghellini, Carlo; Brunetti, Gianfranco; Aldcroft, Tom L.; Bechtold, Jill; Elvis, Martin; Harris, D. E. (2003-10-01). "Discovery of X-ray jets in GPS sources". New Astronomy Reviews. The physics of relativistic jets in the CHANDRA and XMM era. 47 (6): 467–469. doi:10.1016/S1387-6473(03)00073-3. ISSN 1387-6473.
- ^ Siemiginowska, Aneta; Aldcroft, Thomas L.; Bechtold, Jill; Brunetti, Gianfranco; Elvis, Martin; Stanghellini, Carlo (2003). "X-ray Emission from Gigahertz Peaked/Compact Steep Spectrum Sources". Publications of the Astronomical Society of Australia. 20 (1): 113–117. arXiv:astro-ph/0306288. doi:10.1071/as02052. ISSN 1323-3580.
