Detecting Population III Stars through Tidal Disruption Events in the Era of JWST and Roman
The Astrophysical Journal Letters(2024)
摘要
The first generation metal free stars, referred to as population III (Pop
III) stars, are believed to be the first objects to form out of the pristine
gas in the very early Universe. Pop III stars have different structures from
the current generation of stars and are important for generating heavy elements
and shaping subsequent star formation. However, it is very challenging to
directly detect Pop III stars given their high redshifts and short lifetimes.
In this paper, we propose a novel signature for detecting Pop III stars through
their tidal disruption events (TDEs) by massive black holes. We model the
emission properties and calculate the expected rates for these unique TDEs in
the early Universe at z 10. We find that Pop III star TDEs have much higher
mass fallback rates compared to normal TDEs in the local universe and are
therefore rather luminous, rendering them feasible for detection. They also
have very long observed flare evolution timescale, making it more likely to
detect such TDEs during their rising phase. We further demonstrate that a large
fraction of the TDE emissions are redshifted to infrared wavelengths and can be
detected by the James Webb Space Telescope and the Nancy Grace Roman Space
Telescope. Lastly, the TDE rate sensitively depends on the black hole mass
function in the early Universe. We find a promising Pop III star TDE detection
rate of up to a few tens per year using the Nancy Grace Roman Space Telescope.
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关键词
Tidal disruption,Population III stars
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