![]() ![]() ![]() Where would you be most likely to find these objects? (Hint). Explain why you would discover many more neutron stars than those known to observers on Earth. Imagine that you had the ability to travel at will through the Galaxy. What makes ~ a good black-hole candidate? (Hint)ġ4. Observations of ~ in the MeV band by the INTEGRAL imager A8ġ3. It is a strong OH emitter, and CO has been identified in its spectrum. Its spectral type is M6 III, and its surface temperature is about 700 K (about the surface temperature of Venus). Velocity -43 km s-1) discovered by Neugebauer, Martz, and Leighton. Gas falling into the star is heated so much that it radiates in the x-ray range of the spectrum. The existence of this star was discovered in 1972/73 due to its strong x-ray radiation. If black holes exist then ~ was the first one ever identified (it lies near eta Cyg). A 30 Mo B0 supergiant is overflowing its Roche lobe and dumping mass into a massive compact star. One of the best candidates for a black hole system is an X-ray source in the constellation Cygnus. What would happen if the Sun were replaced by a black hole of equal mass?įigure: ~. The ~ system: a blue supergiant star (left) and a black hole (right) in orbit around each other. It is associated with a faint star (HDE 226868), a blue supergiant, with an orbital period of 5.6 days. (2 kpc) away that is a strong source of X-rays. ~Thinking Ahead, 24.6 Evidence for Black Holes It consists of a blue star and a black hole orbiting each other, with the gas pulled off the star by the black hole subsequently heating up and radiating as X-rays. ~, located about 6,100 light years away, is a bright X-ray source that led to the first potential black hole being discovered. The O star is not a source for x-rays, so where are those coming from? However, when you observe it with a regular telescope you see an O type star (named HDE 226868 - isn't that romantic?). In the case of ~, material from a nearby, massive blue companion star is falling into the black hole. ~: ~ is a so-called stellar-mass black hole, a class of black holes that results from the collapse of a massive star. ![]() It was first discovered in 1964 during a rocket flight. ~ is a famous X-ray source, one of the strongest ones seen from Earth. Scientists believe that the source of the x-rays are that of the black hole. It's an x-ray source and a binary system that includes a blue supergiant star. Galactography Systems and Worlds Systems & Worlds C - DĬygnus X-1: this is a stellar-mass black hole that is around 6,500 light-years away. ![]()
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