| Proposal ID | 005634 |
| Title | Low-luminosity accretion in NGC4261 and NGC6251 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0056340101 |
| DOI | https://doi.org/10.5270/esa-xi58joz |
| Principal Investigator, PI | Dr Rita Sambruna |
| Abstract | Most nearby galaxies host supermassive black holes, accreting at low rates inadvection-dominated flows, or ADAFs. Depending on accretion rate and mass loss,hard X-ray continua and emission lines at soft and hard X-rays are expected inthese systems. We propose XMM observations of the nearby low-power radiogalaxies NGC 4261 and NGC 6251, the only radio-loud AGN, along with M87, hostinga supermassive black hole of known mass and where an ADAF may be occurring. Ourproposed XMM observations will allow a detailed study of the hard X-ray continuaand Fe lines detected in the ASCA data of NGC 4261 and NGC 6251, constrainingthe ADAFs dynamical and physical properties as a function of black hole massand luminosity. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2001-12-16T05:25:06Z/2002-03-26T23:56:53Z |
| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2003-05-19T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "ngc 4261", "mass loss", "supermassive black holes", "nearby galaxy", "advection dominated flows", "low luminosity accretion", "ngc 6251", "hard xray", "asca data", "blackhole mass", "emission lines", "accretion rate", "hard xray continua", "fe lines", "NGC4261", "M87", "low rates", "physical properties", "XMM", "radio loud agn", "supermassive blackhole" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Rita Sambruna, 2003, 'Low-luminosity accretion in NGC4261 and NGC6251', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-xi58joz |