| Name | 084514 |
| Title | Do massive BHs really reside in the nuclei of ultra-compact dwarf galaxies? |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0845140201 |
| DOI | https://doi.org/10.5270/esa-pvb8dul |
| Author | European Space Agency |
| Description | There is evidence that ultra-compact dwarf galaxies have ^ated mass-to-light ratios, possibly massive black holes (MBHs). Using stellar dynamics (SD) it was argued that five such UCDs host MBHs in their nuclei ( 10^{6} < M_{\bullet}/M_{\odot} < 10^{7} ). However, robust SD measurements of BH masses are possible in near galaxies, where the BH sphere of influence is well-resolved. It is thus important to find multiple lines of evidence for the presence of such BHs. BHs accreting in a hard-state follow a scaling relation between their mass, radio, and X-ray luminosity. We selected two UCDs where evidence for nuclear BHs has been found from SD. We propose to perform simultaneous X and radio observations to assess whether accreting BHs are indeed present in the nuclei of these two galaxies. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2019-06-08T18:53:28Z/2019-06-09T11:36:48Z |
| 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 | 2020-07-11T22:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2020, Do Massive Bhs Really Reside In The Nuclei Of Ultra-Compact Dwarf Galaxiesquestionmark, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-pvb8dul |