PKS 1335−127

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PKS 1335-127
PKS 1335-127 Pan-STARRS DR1.jpg
The blazar PKS 1335-127.
Observation data (J2000.0 epoch)
Constellation Virgo
Right ascension 13h 37m 39.7828s
Declination −12° 57′ 24.693″
Redshift 0.539000
Heliocentric radial velocity 161,588 km/s
Distance 5.153 gly
Apparent magnitude  (V)19.00
Apparent magnitude  (B)18.5
Characteristics
Type Opt var; HPQ, BL LAC
Other designations
INTREF 569, LEDA 2827642, WMAP 188, QSO B1334-127, OHIO P 158.3, TXS 1334-127

PKS 1335-127 is a blazar [1] located in the constellation of Virgo with a redshift of (z) 0.539. [2] This is a compact BL Lac object containing a radio source of extragalactic origins; discovered in 1970 during the continuum survey conducted by astronomers from Ohio State University. [3] [4] [5] The object shows a radio spectrum appearing as flat, thus making it a flat-spectrum radio quasar (FRSQ), [6] [7] but also classified as a gigahertz-peaked source (GPS) with high polarization. [8] [9]

Contents

Description

PKS 1335-127 is considered to be variable on the electromagnetic spectrum. It is known to produce a near-infrared flare which was detected in February 2013 showing a H-band flux value of 13.691 ± 0.08. [10] Enhanced gamma-ray activity was observed from the object in May 2020, followed by an optical flare one month later. [11] [6] There is presence of large amplitude variability and evidence of position angles showing different rotations at both low and high frequencies from the object. [12]

Radio imaging made by the Very Long Baseline Array on arcsecond scales, shows the structure of PKS 1335-127 is mainly made up of a radio core and a radio jet that is found to curve in an eastwards direction by 6.5" from the core. [13] [14] When imaged at 43 GHz, the jet is revealed to become less defined, with a patch of weak diffused radio emission located southeast. There is also an extended component located at a 152° position angle at a distance of 2.6 milliarcseconds. [14] Earlier observations via a very-long baseline Interferometry (VLBI) map shows the core as unresolved while the jet is found to have an orientation of 135° indicating a perpendicular magnetic field. [15]

Further observations also found the circular polarization in PKS 1335-127 is stable. While images at 15 and 22 GHz respectively shows the presence of compact radio emission focused on the phase center, the image at 43 GHz shows PKS 1335-127 has a double structure containing components with a much stronger southern component. There is also circular polarization towards the jet at its southwestern edge, polarized by 7.16 percent; however it is found 2 factor higher when compared to circular polarization in the jet of 3C 84 (NGC 1275). [16]

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References

  1. ↑ Maraschi, L.; Ciapi, A.; Fossati, G.; Tagliaferri, G.; Treves, A. (1994). Schlegel, Eric M.; Petre, Robert (eds.). ROSAT Observations of the Blazars PKS 1034-293 and PKS 1335-127. The Soft X-ray Cosmos, Proceedings of the ROSAT Science Symposium held College Park, MD, November 8-10, 1993. AIP Conference Proceedings. Vol. 313. New York: American Institute of Physics (AIP). p. 400. Bibcode:1994AIPC..313..400M. doi:10.1063/1.46741.
  2. ↑ Wehrle, Ann E.; Carini, Michael; Wiita, Paul J.; Pepper, Joshua; Gaudi, B. Scott; Pogge, Richard W.; Stassun, Keivan G.; Villanueva, Steven (July 2023). "K2 Optical Emission from OJ 287 and Other γ-Ray Blazars on Hours-to-weeks Timescales from 2014 to 2018". The Astrophysical Journal. 951 (1): 58. doi: 10.3847/1538-4357/acd055 . ISSN   0004-637X.
  3. ↑ Pushkarev, A. B.; Gabuzda, D. C. (1998). "Polarization VLBI Observations of a Complete Sample of Northern BL Lacertae Objects". International Astronomical Union Colloquium. 164: 165–166. doi:10.1017/s0252921100045024. ISSN   0252-9211.
  4. ↑ Epstein, E. E.; Landau, R.; Rather, J. D. G. (1980-11-01). "Extragalactic radio sources: rapid variability at 90 GHz". The Astronomical Journal. 85: 1427–1433. doi:10.1086/112818. ISSN   0004-6256.
  5. ↑ Ehman, J. R.; Dixon, R. S.; Kraus, J. D. (1970-05-01). "The Ohio survey between declinations of 0 and 36 south". The Astronomical Journal. 75: 351–506. doi:10.1086/110985. ISSN   0004-6256.
  6. 1 2 Pursimo, Tapio; Martikainen, Julia; Ojha, Roopesh (2020-06-01). "Optical Flare in the gamma-ray active FSRQ PKS 1335-127". The Astronomer's Telegram. 13771: 1. Bibcode:2020ATel13771....1P.
  7. ↑ Sambruna, Rita M. (October 1997). "Soft X-Ray Properties of Flat-Spectrum Radio Quasars". The Astrophysical Journal. 487 (2): 536–554. doi:10.1086/304640. ISSN   0004-637X.
  8. ↑ Torniainen, I.; Tornikoski, M.; Teräsranta, H.; Aller, M. F.; Aller, H. D. (2005-05-13). "Long term variability of gigahertz-peaked spectrum sources and candidates" (PDF). Astronomy & Astrophysics. 435 (3): 839–856. doi:10.1051/0004-6361:20041886. ISSN   0004-6361.
  9. ↑ Tornikoski, M.; Jussila, I.; Johansson, P.; Lainela, M.; Valtaoja, E. (March 2001). "Radio Spectra and Variability of Gigahertz-Peaked Spectrum Radio Sources and Candidates". The Astronomical Journal. 121 (3): 1306–1318. doi:10.1086/319417. ISSN   0004-6256.
  10. ↑ Carrasco, L.; Escobedo, G.; Recillas, E.; Carraminana, A. (2013-02-01). "NIR brightening of the QSO HB891334-127". The Astronomer's Telegram. 4838: 1. Bibcode:2013ATel.4838....1C.
  11. ↑ Yusafzai, A.; Tomankova, L. (2020-05-01). "Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ PKS 1335-127". The Astronomer's Telegram. 13741: 1. Bibcode:2020ATel13741....1Y.
  12. ↑ Impey, C. D.; Brand, P. W. J. L.; Wolstencroft, R. D.; Williams, P. M. (1984-07-01). "Infrared polarimetry and photometry of BL Lac objects - II". Monthly Notices of the Royal Astronomical Society. 209 (2): 245–269. doi: 10.1093/mnras/209.2.245 . ISSN   0035-8711.
  13. ↑ Perley, R. A. (1982-06-01). "The positions, structures and polarizations of 404 compact radio sources". The Astronomical Journal. 87: 859–880. doi:10.1086/113167. ISSN   0004-6256.
  14. 1 2 Lister, Matthew L.; Marscher, Alan P.; Gear, W. K. (1998-09-10). "Submilliarcsecond Polarimetric Imaging of Blazar Jets at 43 GHz". The Astrophysical Journal. 504 (2): 702–719. doi:10.1086/306112. ISSN   0004-637X.
  15. ↑ Nartallo, R.; Gear, W. K.; Murray, A. G.; Robson, E. I.; Hough, J. H. (1998-07-01). "A Millimetre/Submillimetre Polarization Survey of Compact Flat-Spectrum Radio Sources". Monthly Notices of the Royal Astronomical Society. 297 (3): 667–686. Bibcode:1998MNRAS.297..667N. doi: 10.1046/j.1365-8711.1998.01405.x . ISSN   0035-8711.
  16. ↑ Vitrishchak, V. M.; Gabuzda, D. C.; Algaba, J. C.; Rastorgueva, E. A.; O'Sullivan, S. P.; O'Dowd, A. (2008-11-21). "The 15-43 GHz parsec-scale circular polarization of 41 active galactic nuclei". Monthly Notices of the Royal Astronomical Society. 391 (1): 124–135. doi: 10.1111/j.1365-2966.2008.13919.x . ISSN   0035-8711.
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