id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
app01-2378	Schartel, Norbert	Black Hole Results from XMM-Newton	2014	5	.pdf	application/pdf	3341	250	71	The strong gravitational field Currently, X-ray observations are the only way to ob- serve the strong gravitational field in the direct vicinity of black holes and neutron stars ([14]). A periodicity of ˜1hour in X-ray emission from the active galaxy RE J1034+396.	cache/app01-2378.pdf	txt/app01-2378.txt