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PKS 0637-752
Chandra X-ray Observatory image of PKS 0637-752
Observation data (J2000.0 epoch)
Constellation	Mensa
Right ascension	06 35 46.5
Declination	−75° 16′ 16.8″
Redshift	0.653000
Heliocentric radial velocity	195,765 km/s
Distance	6.0 Gly
Apparent magnitude (V)	0.34
Apparent magnitude (B)	0.26
Characteristics
Type	FRSQ, Blazar
Notable features	X-ray jet
Other designations
IRAS F06374-7513, PGC 2824867, MRC 0637-752, 2E 1720, OCARS 0637-752

PKS 0637-752 is a quasar located six billion light years in the constellation of Mensa. It is noted for having a bright and largest astrophysical jet at redshift of z = 0.651. Discovered by Einstein Observatory in 1980 through X-rays, PKS 0637-752 was the first celestial object to be observed by Chandra X-ray Observatory upon its commissioning in July 23, 1999.

Characteristics

PKS 0637-752 contains an active galactic nucleus. It is classified a blazar, a type of an active galaxy with a relativistic jet pointing towards Earth's direction. Like other quasars, PKS 0637-752 is considered luminous, powering up 10 trillion times the sun, with a supermassive black hole in its center.

X-ray jet

PKS 0637-752 contains a high γ-ray flux X-ray jet studied by Hubble Space Telescope and Spitzer. The jet extends ≥100 kiloparsecs wide and has a luminosity of ~10 ergs. It produces X-ray emission through inverse Compton scattering from the cosmic microwave background.

Further observations from Hubble also found three small knots occurring concurrently with the X-ray emission and peak radio. According to observations made by Australia Telescope Compact Array, these knots are shown to be quasi-periodic with a separation gap of ~1.1 arcsecs. Using two class models, astronomers calculated the jet power of PKS 0637-752 to be Q ~ 10 erg/s and the jet engine modulation to be 2 x 10 yr < \tau < 3x 10 yr. Such evidence, proves the jet structure in the quasar might result from an unstable accretion disk, causing limit cycle behavior.

References

1. "NED Search Results for PKS 0637-752". ned.ipac.caltech.edu. Retrieved 2024-09-04.
2. ^ Schwartz, D. A.; Marshall, H. L.; Lovell, J. E. J.; Piner, B. G.; Tingay, S. J.; Birkinshaw, M.; Chartas, G.; Elvis, M.; Feigelson, E. D.; Ghosh, K. K.; Harris, D. E.; Hirabayashi, H.; Hooper, E. J.; Jauncey, D. L.; Lanzetta, K. M. (2000-09-10). "[ITAL]Chandra[/ITAL] Discovery of a 100 kiloparsec X-Ray Jet in PKS 0637−752". The Astrophysical Journal. 540 (2): L69 – L72. doi:10.1086/312875. ISSN 0004-637X.
3. Lovell, J. E. J.; Tingay, S. J.; Piner, B. G.; Jauncey, D. L.; Preston, R. A.; Murphy, D. W.; McCulloch, P. M.; Costa, M. E.; Nicolson, G.; Hirabayashi, H.; Reynolds, J. E.; Tzioumis, A. K.; Jones, D. L.; Lister, M. L.; Meier, D. L.; Birkinshaw, M.; Chartas, G.; Feigleson, E. D.; Garmire, G. P.; Ghosh, K. K.; Marshall, H. L.; Mathur, S.; Sambruna, R. M.; Schwartz, D. A.; Tucker, W. H.; Wilkes, B.; Worrall, D. M. (2000). "VSOP and ATCA Observations of PKS 0637-752". Astrophysical Phenomena Revealed by Space Vlbi: 215. Bibcode:2000aprs.conf..215L. Retrieved 2024-09-04.
4. Elvis, M.; Fabbiano, G. (1984-05-01). "X-ray and UV observations of two radio-bright quasars". The Astrophysical Journal. 280: 91–97. Bibcode:1984ApJ...280...91E. doi:10.1086/161970. ISSN 0004-637X.
5. Chartas, G.; Worrall, D. M.; Birkinshaw, M.; Cresitello-Dittmar, M.; Cui, W.; Ghosh, K. K.; Harris, D. E.; Hooper, E. J.; Jauncey, D. L.; Kim, D.-W.; Lovell, J.; Mathur, S.; Schwartz, D. A.; Tingay, S. J.; Virani, S. N. (2000-10-20). "TheChandra X-Ray ObservatoryResolves the X-Ray Morphology and Spectra of a Jet in PKS 0637−752". The Astrophysical Journal. 542 (2): 655–666. doi:10.1086/317049. ISSN 0004-637X.
6. Podjed, Stephanie A.; Hickox, Ryan C.; Isler, Jedidah C.; Böttcher, Markus; Schutte, Hester M. (2024-06-01). "Optical Spectropolarimetric Variability Properties in Blazars PKS 0637–75 and PKS 1510–089". The Astrophysical Journal. 968 (2): 130. arXiv:2406.17687. doi:10.3847/1538-4357/ad4111. ISSN 0004-637X.
7. Ghisellini, G.; Tavecchio, F.; Foschini, L.; Ghirlanda, G.; Maraschi, L.; Celotti, A. (2009-11-26). "General physical properties of bright Fermi blazars". Monthly Notices of the Royal Astronomical Society. 402 (1): 497–518. arXiv:0909.0932. doi:10.1111/j.1365-2966.2009.15898.x. ISSN 0035-8711.
8. "Chandra Press Room :: Fact Sheet: PKS 0637-752". chandra.si.edu. Retrieved 2024-09-04.
9. "Distant Quasar Ejects 2 Million Light-Year Long Jet of Cosmic Material". SciTechDaily. October 23, 2012.
10. Lucchini, M.; Tavecchio, F.; Ghisellini, G. (2016-12-22). "Revisiting the EC/CMB model for extragalactic large scale jets". Monthly Notices of the Royal Astronomical Society: stw3316. arXiv:1610.01580. doi:10.1093/mnras/stw3316. ISSN 0035-8711.
11. Bhattacharyya, Wrijupan; Gupta, Nayantara (2016-02-01). "Proton Synchrotron Radiation from Extended Jets of PKS 0637-752 and 3C 273". The Astrophysical Journal. 817 (2): 121. arXiv:1511.00258. Bibcode:2016ApJ...817..121B. doi:10.3847/0004-637X/817/2/121. ISSN 0004-637X.
12. Edwards, Philip G.; Piner, B. Glenn; Tingay, Steven J.; Lovell, James E. J.; Kataoka, Jun; Ojha, Roopesh; Murata, Yasuhiro (2006-04-01). "The Parsec-Scale Jet of PKS 0637-752". Publications of the Astronomical Society of Japan. 58: 233–241. Bibcode:2006PASJ...58..233E. doi:10.1093/pasj/58.2.233. ISSN 0004-6264.
13. Mehta, Kushal T.; Georganopoulos, Markos; Perlman, Eric S.; Padgett, Charles A.; Chartas, George (2009-01-01). "HST observations of the quasar PKS 0637-752: equipartition electron-proton jet from the most complete spectral coverage to date". The Astrophysical Journal. 690 (2): 1706–1714. arXiv:0809.1608. doi:10.1088/0004-637X/690/2/1706. ISSN 0004-637X.
14. Uchiyama, Yasunobu; Urry, C. Megan; Van Duyne, Jeffrey; Cheung, C. C.; Sambruna, Rita M.; Takahashi, Tadayuki; Tavecchio, Fabrizio; Maraschi, Laura (2005-09-14). "Spitzer IRAC Imaging of the Relativistic Jet from Superluminal Quasar PKS 0637-752". The Astrophysical Journal. 631 (2): L113 – L116. doi:10.1086/497426. ISSN 0004-637X.
15. Tavecchio, Fabrizio; Maraschi, Laura; Sambruna, Rita M.; Urry, C. Megan (2000-11-20). "The X-Ray Jet of PKS 0637−752: Inverse Compton Radiation from the Cosmic Microwave Background?". The Astrophysical Journal. 544 (1): L23 – L26. arXiv:astro-ph/0007441. doi:10.1086/317292. ISSN 0004-637X.
16. Kusunose, Masaaki; Takahara, Fumio (2017-01-16). "A Photo-Hadronic Model of the Large-Scale Jet of PKS 0637-752". The Astrophysical Journal. 835 (1): 20. arXiv:1611.08046. doi:10.3847/1538-4357/835/1/20. ISSN 0004-637X.

v t e Constellation of Mensa
List of stars in Mensa
Stars	Bayer α β γ δ ε ζ η θ ι κ λ μ ν ξ π Variable W TU TY TZ UX YY AH AO HR 1109 1154 1531 1606 1682 1700 HD 35184 38283 (Bubup) 39194 42936 268835 Other OGLE-LMC-CEP0227 R71 WISE 0535−7500
Exoplanets π Mensae b c d HD 38283 b (Yanyan)
Star clusters NGC 1943 NGC 1959 NGC 1986 NGC 1987 NGC 2000
Nebulae Henize 206 NGC 2122
Galaxies	NGC 2012 2144 Other Large Magellanic Cloud (mostly in Dorado, partly in Hydrus) PKS 0637-752
Category

• Quasars
• Mensa (constellation)
• Principal Galaxies Catalogue objects
• Blazars
• Astronomical objects discovered in 1980
• IRAS catalogue objects