ar X iv : a st ro - p h / 05 10 37 8 v 1 1 3 O ct 2 00 5 And Don ’ t Forget The Black Holes ⋆
نویسندگان
چکیده
The discovery of the highly relativistic neutron star (NS) binary (in which both NS's are pulsars) not only increases the estimated merging rate for the two NS's by a large factor, but also adds the missing link in the double helium star model of binary NS evolution. This model gives ∼ 20 times more gravitational merging of low-mass black-hole (LMBH), NS binaries than binary NS's, whatever the rate for the latter is. The recent discovery of Burgay et al. [1] of the double pulsar PSR J0737−3039A and PSR J0737−3039B [2] is very interesting for many reasons. One that is not so obvious is that it involves just about the lowest possible mass main sequence giants as progenitors, which have not been encountered in the evolution of the other binary NS's, even though there are 20 to 30 times more of them, as we show below. The observational evidence is strong that NS binaries evolve from double helium stars, avoiding the common envelope evolution of the standard scenario ⋆ This paper was finished about a year before Hans Bethe died. We submitted it to one of the leading popular scientific journals. The editor we submitted it to returned it to us the next day saying that there was insufficient interest to warrant publication. Given the large number of letters now being published on short γ-ray bursts and the fact that the merging of black-hole, neutron-star binaries appear to be as good as, if not better, than the merging of neutron-star, neutron-star binaries as a source of these bursts, we believe our factor of ∼ 20 in the ratio of the former to the latter to be highly relevant. Therefore we put our paper in the archives. It will be published in Hans Bethe and his Physics by World Scientific (2 July, 2006).
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