| Proposal ID | 004435 |
| Title | The X-ray emission of composite galaxies |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0044350101 |
| DOI | https://doi.org/10.5270/esa-1grw6fa |
| Principal Investigator, PI | Dr Ioannis Georgantopoulos |
| Abstract | 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 |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2002-04-20T11:22:15Z/2002-10-21T06:05:47Z |
| Version | 21.51_20241115_1113 |
| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2003-11-14T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "optical spectra", "agn activity", "composite objects", "ROSAT", "powerful obscured agn", "absent signatures", "hii galaxy", "XMM", "soft xray luminosities", "extragalactic sources", "xray emission", "composite galaxy", "faint fluxes", "1995 constituting", "narrow line agn" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Ioannis Georgantopoulos, 2003, 'The X-ray emission of composite galaxies', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-1grw6fa |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |