10 January 2015
Within the middle of our galaxy there’s a supermassive black gap referred to as Sgr A*. By observations of stars orbiting the black gap, we all know it has a mass of about 4 million Suns. Usually this black gap is fairly quiet, however in 2013 there was an sudden x-ray burst.
What’s attention-grabbing about this burst is the shortness of its length. In simply a few hours Sgr A* brightened by an element of 400 earlier than fading to regular ranges. Given the length it’s doable that an asteroid-sized object was captured by the black gap, making a burst of power earlier than crossing its occasion horizon. Simulations of such captures point out that the physique can be ripped aside by tidal forces and drastically heated earlier than ultimate seize, which might produce an x-ray burst lasting an hour or so. One other concept is that it could possibly be attributable to magnetic area strains within the black gap’s accretion disk snapping into realignment after being twisted across the black gap. We see comparable results with the magnetic area strains of the Solar and different stars.
It’s tough to make sure, as a result of Sgr A* is hidden behind a wall of gasoline and dirt within the middle of our galaxy referred to as the zone of avoidance. This implies seen gentle from that area is blocked, and we will solely observe Sgr A* with radio waves and x-rays or gamma rays. It isn’t doable to detect small our bodies similar to asteroids or planets orbiting the black gap.
If different small our bodies are heading for the black gap, we gained’t know till after it’s occurred.