| Name | 060071 |
| Title | [HB89] 0102-272: a quasar with an extremely steep soft photon index? |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0600710101 |
| DOI | https://doi.org/10.5270/esa-d8zxhw4 |
| Author | Prof Thomas Boller |
| Description | We report on a quasar with a steep soft 0.1-2.4 keV X-ray photon index based on ROSAT PSPC observations. [HB89] 0102-272 exhibits a photon index of (6.55+-2.07). A second observation of the object confirms the steep photon index of (6.40+-2.20). This is the steepest spectral energy distribution in the 0.1-2.4 keV energy band from an extragalactic object reported so far. We intend to find out, whether other models can explain the ROSAT data. We show that an ionized absorber can flatten the spectrum significantly. The 2.4-10 keV energy distribution will be determined for the first time. As the object is expected to be more complex we ask for a 50 ks snapshot observation in order to determine the significance of additional spectral components. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2009-12-05T02:20:07Z/2009-12-05T08:30:25Z |
| 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 | 2010-12-17T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Thomas Boller, 2010, 060071, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-d8zxhw4 |