The ADAF model for stellar-mass Galactic black holes makes a specificprediction: at fractional Eddington mass accretion rates below 0.08, the inneredge of the accretion disk should be truncated at appx. 1 E+4 Schwarzschildradii. Disks truncated at such radii should not be visible in X-rays, as viscousheating is small when the disk is not very deep in the gravitational potential.We request 270 ksec of goodtime to observe GX 339-4 in quiescence withXMM-Newton, to rigorously test the truncated disk prediction at an m-dot-Edd. of3 E-5 by searching for a disk component in the X-ray spectrum. We will supportthis observation with IR (Magellan) and radio (ATCA) monitoring observation.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-03-16T15:40:25Z/2004-03-20T05:46:55Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr JON MILLER, 2005, 'XMM-NEWTON OBSERVATIONS OF GX 339-4', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-llijj2v
