• Source: PKS 0537-441

PKS 0537-441 is a blazar located in the constellation of Pictor. It has a redshift of 0.896 and was discovered in 1973 by an American astronomer named Olin J. Eggen, who noted it as a luminous quasar. This is a BL Lacertae object in literature because of its featureless optical spectra as well as both a possible gravitational microlensing and a gravitationally lensed candidate. Its radio source is found compact and is characterized by a spectral peak in the gigahertz range, making it a gigahertz-peaked spectrum source (GPS).




Description


PKS 0537-441 is found violently variable on the electromagnetic spectrum at all frequencies, and is a source of gamma ray emission. Between December 2004 and March 2005, it underwent intense activity showing more than 4 magnitudes in a V filter in 50 days and 2.5 in 10 days. PKS 0537-441 is also known to display two flaring episodes, one in July 2009 and one in March 2010, with its gamma ray luminosity in the 0.1-100 GeV energy range reaching a peak value (2.6 x 1048 erg s−1) on 3-d timescales at the end of the month. During its variability, PKS 0537-441 shows signs of both flux and color index variability on timescales.
PKS 0537-441 contains a radio structure. The source is found to be core dominated on arcsecond scales with a secondary bright component separated by 7".2 at a 305° positional angle (PA). However, according to 2.3 GHz observations conducted by the Southern Hemisphere VLBI Experimental program (SHEVE), the radio structure has a 4.2 Jansky core with a measured diameter of 1.1 mas. There is a jetlike component, confirmed to be an asymmetric core-jet structure according to a 5 GHz Very-long-baseline interferometry imaging. This component is located north of the compact core.
PKS 0537-441 shows gamma ray and optical oscillations. During its high state between August 2008 and 2011, the periodogram of its gamma ray light curve displays a peak reaching T0 ~ 280 days with significance of 99.7%. A broad magnesium ionized emission line was also discovered at redshift (z) 0.885, implied to be a mini low ionization broad absorption-line quasar. This speculates PKS 0537-441 might be a binary quasar.




References






External links


PKS 0537-441 on SIMBAD
PKS 0537-441 on NASA/IPAC Database

Kata Kunci Pencarian:

• Kalimantan Tengah
• PKS 0537-441
• 2MASS J05581644–4501559
• Zeta Pictoris
• Kappa Pictoris
• Eta2 Pictoris
• Eta1 Pictoris
• Lambda Pictoris
• Iota Pictoris