One Approach to the Star-Formation History Inferred from the GRB Lag--Luminosity Relation

Details One Approach to the Star-Formation History Inferred from the GRB Lag--Luminosity Relation One Approach to the Star-Formation History Inferred from the GRB Lag--Luminosity Relation

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55l..65m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.5, pp. L65-L68

Astronomy and Astrophysics

Astronomy

13

Cosmology: Early Universe, Gamma-Rays: Bursts, Stars: Formation

Scientific paper

The distances of about thirty gamma-ray bursts (GRBs) are known. The most remote one is at ˜ 4.5, and the remaining more dimmer GRBs are supposed to be more remote. If we can estimate the distances for the dimmer GRBs, their distances should be much beyond ˜ 4.5. Two independent studies to estimate their distances were previously conducted. One was based on the variability-luminosity relation, and the other was based on the lag-luminosity relation. However, these relations can apply only for a very limited range of luminosity. In this paper, we introduce the viewing angles and use a new lag-luminosity relation by Ioka and Nakamura (2001, ApJ, 554, L163), which is capable of explaining the luminosity of the nearest GRBs. By applying the new relation, we infer the star-formation history out to ˜ 4. Our result shows an increasing trend of star-formation out to ˜ 4. However, the lag-luminosity relation itself is still a matter of debate, and thus this w ork is a tentative approach. For example, we have used only eight known GRB distances. Our result should be checked and calibrated by future data with Swift, observing more distant GRBs.

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