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2 years ago in Astrophysics , Physics By Amy

What is known about the redshift of the blazar PKS0447-43?

I'm modeling the broadband spectral energy distribution of TeV blazars, and PKS 0447-43 is a key calibrator source. Its redshift is a critical input for de-absorbing its gamma-ray spectrum from extragalactic background light. I've found conflicting values in older literature and need to know the most reliable, modern measurement to accurately calculate its intrinsic luminosity and emission models.

 

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By Trisha Answered 2 years ago

For PKS 0447-43, the most reliable and commonly cited redshift is z = 0.107. This value comes from optical spectroscopy identifying absorption lines from the host galaxy, which is more secure than methods relying on broad emission lines that can be shifted. In my work on TeV source populations, this redshift is crucial. It places the blazar close enough that its very-high-energy gamma-ray signal isn't completely attenuated by the Extragalactic Background Light, making it a brilliant laboratory for studying particle acceleration in jets. An incorrect redshift would throw off all calculations of its intrinsic peak energy and jet power, so using this consensus value is key.

 

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