We propose 20 ks XMM observations on each of the two X--ray bright BL Lac objects Mkn 180 and 1ES1517+656. Our primary aim is to study the strong soft X-ray absorption feaures that are sometimes seen in BL Lac objects (such as PKS 2155-304 and others). Our main scientific goals are (1) to begin determining how generic these features are in BL Lacs; and (2) to study these features in sufficient detail to determine their origin. Other benefits may also accrue, such as detecting intervening absorption, or providing a new way to measure BL Lac object redshifts.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2001-04-12T08:28:45Z/2001-04-12T16:37:53Z
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 Julian Krolik, 2002, 'Search for X--ray spectral features in two BL Lac Objects', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-prsyshi
