Probing the warm intergalactic medium through absorption against gamma-ray burst X-ray afterglows
Astrophysical Journal, ISSN: 1538-4357, Vol: 544, Issue: 1 PART 2, Page: L7-L10
2000
- 17Citations
- 2Captures
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Article Description
Gamma-ray burst (GRB) afterglows close to their peak intensity are among the brightest X-ray sources in the sky. Despite their fast power-law-like decay, when fluxes are integrated from minutes up to hours after the GRB event, the corresponding number counts (log N-log F relation) far exceed those of any other high-redshift (z > 0.5) source, the flux of which is integrated over the same time interval. We discuss how to use X-ray afterglows of GRBs as distant beacons to probe the warm (10 K < T < 10 K) intergalactic matter in filaments and outskirts of clusters of galaxies by means of absorption features, the "X-ray forest." According to current cosmological scenarios, this matter may comprise 30%-40% of the baryons in the universe at z < 1. Present-generation X-ray spectrometers such as those on Chandra and XMM-Newton can detect it along most GRBs' lines of sight, provided afterglows are observed soon enough (within hours) after the burst. A dedicated medium-sized X-ray telescope (effective area ≲0.1 m) with pointing capabilities similar to that of Swift (minutes) and high spectral resolution (E/ΔE ≳ 300) would be very well suited to exploit the new diagnostic and study the physical conditions in the universe at the critical moment when structure is being formed.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0034693504&origin=inward; http://dx.doi.org/10.1086/317286; https://iopscience.iop.org/article/10.1086/317286; https://dx.doi.org/10.1086/317286; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=3c0d8dbe-e0af-49e3-82ba-86d10e7ca958&ssb=32795231725&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1086%2F317286&ssi=b3ebfc51-8427-4775-bceb-f69f141270f7&ssk=support@shieldsquare.com&ssm=37178281992174676123251479597295126&ssn=eed61b0c45299a1915d14ae3d5f6cbd954eda842bdc0-9b7b-4e59-b2f70f&sso=d08550fa-9e3578620ac4d63c4e8480d8dcdd343437d0876449c8de6a&ssp=86079979451719990602171998657781779&ssq=64991929248583307085841132775874252485723&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJfX3V6bWYiOiI3ZjYwMDBiM2EzMDFlNy1mMjVlLTRkMzktOTQ0Yi1hYjlhOGY0NDkwYzYxNzE5OTQxMTMyNTY0NTEzNTI4NDAtMWYyNjkxMzJmODhmMmE3NTEyMzI1IiwicmQiOiJpb3Aub3JnIiwidXpteCI6IjdmOTAwMGVkNzhmMjJjLTg5MmItNDU2YS1hZmUyLTM4ODlhOGM5MjQxNDItMTcxOTk0MTEzMjU2NDUxMzUyODQwLTkyY2ViYzFjODRmZmJiZTgxMjMyNSJ9
American Astronomical Society
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