We propose to observe 3 composite low redshift galaxies, z=0.02-0.03, classifiedas HII/Seyfert-2 composites by Moran et al. 1996. This important class of objectpresents optical spectra with the characteristics of HII galaxiesand very weak or absent signatures of AGN activity, despite the very high softX-ray luminosities. Similar composite objects have also been detected in deep ROSAT surveys (eg Boyle et al. 1995) constituting a significant fraction of the extragalactic sources at faint fluxes. Our proposed XMM observations will demonstrate whether these objects harbour a powerful obscured AGN or alternatively a low luminosity naked (ie very weak or absent broad-line region)AGN and will help to constrain the contribution of narrow line AGN to the XRB
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2002-04-20T11:22:15Z/2002-10-21T06:05:47Z
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 Ioannis Georgantopoulos, 2003, 'The X-ray emission of composite galaxies', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-1grw6fa
