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首页> 外文期刊>The Astrophysical journal >PROBING FOR MACHOs OF MASS 10~(-15) solar mass TO 10~(-7) solar mass WITH GAMMA-RAY BURST PARALLAX SPACECRAFT
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PROBING FOR MACHOs OF MASS 10~(-15) solar mass TO 10~(-7) solar mass WITH GAMMA-RAY BURST PARALLAX SPACECRAFT

机译：伽玛射线爆破视差航天器对质量为10〜（-15）的太阳质量到10〜（-7）的太阳质量的探测

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摘要

Two spacecraft separated by approximately 1 AU and equipped with gamma-ray burst (GRB) detectors could detect or rule out a cosmological density of massive compact halo objects (MACHOs) in the mass range 10~(-15) solar mass approx < 10~(-7) solar mass, provided that GRBs prove to be cosmological. Previously devised methods for detecting MACHOs have spanned the mass range 10~(-16) solar mass approx < M approx < 10~7 solar mass, but with a gap of several orders of magnitude near 10~(-9) solar mass. For MACHOs and sources both at a cosmological distance, the Einstein radius is approximately 1 AU(M/10~(-7) solar mass)~(1/2). Hence, if a GRB lies within the Einstein ring of a MACHO of mass M approx < 10~(-7) solar mass as seen by one detector, it will not lie in the Einstein ring as seen by a second detector approximately 1 AU away. This implies that if GRBs are measured to have significantly different fluxes by the two detectors, this would signal the presence of a MACHO approx < 10~(-7) solar mass. By the same token, if the two detectors measured similar fluxes for several hundred events, a cosmological abundance of such low-mass MACHOs would be ruled out. The lower limit is set by the time resolution t_(res) of the detectors: M approx < 10~(15) solar mass corresponds to t_(res) approx < 10~(-2) s. If low-mass MACHOs are detected, there are tests that can discriminate among events generated by MACHOs in the three mass ranges M approx < 10~(-12) solar mass, 10~(-12) solar mass approx < M approx < 10~(-7) solar mass, and M approx > 10~(-7) solar mass. Further experiments would then be required to make more accurate mass measurements.
机译：两颗被大约1 AU隔开并装有伽玛射线爆发（GRB）探测器的航天器，可以探测或排除质量范围为10〜（-15）太阳质量约<10〜的大型致密光晕物体（MACHOs）的宇宙学密度。 （-7）太阳质量，前提是GRB证明是宇宙学的。先前设计的用于检测MACHO的方法已经跨越了质量范围10〜（-16）太阳质量，大约 10〜（-7）太阳质量。然后需要进一步的实验以进行更精确的质量测量。

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