A dataset provided by the European Space Agency

Name 005634
Title Low-luminosity accretion in NGC4261 and NGC6251


DOI 10.5270/esa-xi58joz
Author Dr Rita Sambruna
Description Most nearby galaxies host supermassive black holes, accreting at low rates in advection-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 in these systems. We propose XMM observations of the nearby low-power radio galaxies NGC 4261 and NGC 6251, the only radio-loud AGN, along with M87, hosting a supermassive black hole of known mass and where an ADAF may be occurring. Our proposed XMM observations will allow a detailed study of the hard X-ray continua and Fe lines detected in the ASCA data of NGC 4261 and NGC 6251, constraining the ADAF.s dynamical and physical properties as a function of black hole mass and luminosity.
Publication On the origin of the X-rays and the nature of accretion in NGC 4261 . Gliozzi, M., Sambruna, R. M., . A&A . 408-949 . 2003 . 2003A&A...408..949G ,
The XMM-Newton view of NGC 6251 . Gliozzi, M., Sambruna, R. M., et all. . A&A . 413-139 . 2004 . 2004A&A...413..139G ,
The XMM-Newton view of the X-ray halo and jet of NGC 6251 . Sambruna, R. M., Gliozzi, M., et all. . A&A . 414-885 . 2004 . 2004A&A...414..885S ,
Evidence for radio-source heating of groups . Croston, J. H., Hardcastle, M. J., . MNRAS . 357-279 . 2005 . 2005MNRAS.357..279C ,
Chandra and XMM-Newton observations of NGC 6251 . Evans, D. A., Hardcastle, M. J., et all. . MNRAS . 359-363 . 2005 . 2005MNRAS.359..363E ,
The XMM-Newton Needles in the Haystack Survey: the local X-ray luminosity function of 'normal. galaxies . Georgantopoulos, I., Georgakakis, A., . MNRAS . 360-782 . 2005 . 2005MNRAS.360..782G ,
The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue . Watson, M. G., Schroder, A. C., et all. . A&A . 493-339 . 2009 . 2009A&A...493..339W ,
Soft X-Ray and Ultraviolet Emission Relations in Optically Selected AGN Samples . Strateva, Iskra V., Brandt, W. N., et all. . AJ . 130-387 . 2005 . 2005AJ....130..387S ,
The X-ray Energy Dependence of the Relation Between Optical and X-ray Emissi...
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 Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2003-05-19T00:00:00Z, 005634, 17.56_20190403_1200. https://doi.org/10.5270/esa-xi58joz