Fires in the deep: The luminosity distribution of early-time gamma-ray-burst afterglows in light of the Gamow Explorer sensitivity requirements
arxiv(2024)
摘要
Gamma-ray bursts (GRBs) are ideal probes of the Universe at high redshift (z
> 5), pinpointing the locations of the earliest star-forming galaxies and
providing bright backlights that can be used to spectrally fingerprint the
intergalactic medium and host galaxy during the period of reionization. Future
missions such as Gamow Explorer are being proposed to unlock this potential by
increasing the rate of identification of high-z GRBs to rapidly trigger
observations from 6-10 m ground telescopes, JWST, and the Extremely Large
Telescopes. Gamow was proposed to the NASA 2021 Medium-Class Explorer (MIDEX)
program as a fast-slewing satellite featuring a wide-field lobster-eye X-ray
telescope (LEXT) to detect and localize GRBs, and a 30 cm narrow-field
multi-channel photo-z infrared telescope (PIRT) to measure their photometric
redshifts using the Lyman-alpha dropout technique. To derive the PIRT
sensitivity requirement we compiled a complete sample of GRB
optical-near-infrared afterglows from 2008 to 2021, adding a total of 66 new
afterglows to our earlier sample, including all known high-z GRB afterglows. We
performed full light-curve and spectral-energy-distribution analyses of these
afterglows to derive their true luminosity at very early times. For all the
light curves, where possible, we determined the brightness at the time of the
initial finding chart of Gamow, at different high redshifts and in different
NIR bands. We then followed the evolution of the luminosity to predict
requirements for ground and space-based follow-up. We find that a PIRT
sensitivity of 15 micro-Jy (21 mag AB) in a 500 s exposure simultaneously in
five NIR bands within 1000s of the GRB trigger will meet the Gamow mission
requirement to recover > 80
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要