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新生黑洞含有宇宙最强大的射线

时间:2011-01-11 05:19 点击:
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在银河系中心,这个新的黑洞与那些其大无比的兄妹相比是那么微不足道,但是它的诞生可能喷涌出宇宙最强大的粒子。

亚原子粒子被检测到以无法令人无法相信地高能进入地球大气层,但这些极端高能的宇宙射线的来源一直是个谜。一些人争论说,能量是由一个巨大的单个星体的崩溃所释放出来的,但这种事情的几率是非常低的。

哥伦布俄亥俄州州立大学的与他的同事认为这种极端高能的宇宙射线可能起源于两种死亡星体的合并,由此产生了一个黑洞。他们得出这一结论是基于一个系统的发现,这个系统是由普林斯顿大学的领导的一个团队为了合并而设定的。Badenes的团队试验档案观测并发现白色小的中子星体非常近的围绕另一个运转。它们彼此作螺旋运动,可能在500万年内合并形成一个黑洞。

Thompson和他的同事指出Badenes的团队在发现这一系统之前,仅探查了银河系非常小的部分,由此可提出这种注定的一对是非常多的。这一团队计算得出,这种碰撞更加普遍,是单个星体崩溃的100倍。

“这种物体当然是非常有趣的。”科罗拉多州州立大学的Miguel Mostafá ,Fort Collins说,他不是这两个团队的成员,但他表示合并的几率仍是不能确定的。

译文:Baby black holes implicated in universe's mightiest rays


Baby black holes are puny compared with theirhumongous cousins at the centres of galaxies, but their birth may spewout the universe's mightiest particles.

Subatomicparticles are routinely detected smashing into Earth's atmosphere atincredibly high energies, but the origin of these ultra-high-energycosmic rays (UHECRs) remains a mystery. Some have argued that energyreleased by the collapse of a massive single star to form a black holemight produce the UHECRs, but the rate of such events is too low.

at Ohio State University in Columbus and his colleagues argue thatUHECRs may instead originate in the merger of two types of dead star,which gives birth to a black hole. They base this conclusion on thediscovery of a system destined for such a merger by a team led by ofPrinceton University. Badenes's team examined archival observations andfound a white dwarf and neutron star orbiting one another extremelyclosely. They are spiralling toward each other, and should merge toform a black hole within 500 million years.

Thompsonand colleagues point out that Badenes's team probed only a tinyfraction of the galaxy before finding this system, suggesting suchdoomed pairs are abundant. These collision events should be about 100times more common than collapses of individual stars, the teamcalculates (arxiv.org/0912.0009).

"Theseobjects are certainly very interesting," says Miguel Mostafá ofColorado State University, Fort Collins, who is not a member of eitherteam, but he cautions that the rate of mergers is still highlyuncertain.


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