A dataset provided by the European Space Agency

Name: SQUARE_BRACKET_OPENHB89SQUARE_BRACKET_CLOSE 0102-272: a quasar with an extremely steep soft photon indexquestionMark
Published: 2010-12-17T00:00:00Z

Proposal ID	060071
Title	HB89 0102-272: a quasar with an extremely steep soft photon index?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0600710101
DOI	https://doi.org/10.5270/esa-d8zxhw4
Principal Investigator, PI	Prof Thomas Boller
Abstract	We report on a quasar with a steep soft 0.1-2.4 keV X-ray photon index based onROSAT PSPC observations. HB89 0102-272 exhibits a photon index of(6.55+-2.07). A second observation of the object confirms the steep photon indexof (6.40+-2.20). This is the steepest spectral energy distribution in the0.1-2.4 keV energy band from an extragalactic object reported so far. We intendto find out, whether other models can explain the ROSAT data. We show that anionized absorber can flatten the spectrum significantly. The 2.4-10 keV energydistribution will be determined for the first time. As the object is expected tobe more complex we ask for a 50 ks snapshot observation in order to determinethe significance of additional spectral components.
Publications	XMM-Newton, Swift, and ROSAT Observations of LBQS 0102-2713 \|Boller, Th., Schady, P., \| ApJ \| 731-16 \| 2011 \| 2011ApJ...731L..16B \| http://ui.adsabs.harvard.edu/#abs/2011ApJ...731L..16B Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift \|Yershov, V. N., \| Ap&SS \| 354-97 \| 2014 \| 2014Ap&SS.354...97Y \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch, Eric W., \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F AGN spectral states from simultaneous UV and X-ray observations by XMM-Newton \|Svoboda, J., Guainazzi, M., \| A&A \| 603-127 \| 2017 \| 2017A&A...603A.127S \| http://ui.adsabs.harvard.edu/#abs/2017A&A...603A.127S Classification of 4XMM-DR9 sources by machine learning \|Zhang, Yanxia, Zhao, Yongheng, \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z Robust constraints on feebly interacting particles using XMM-Newton \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque, Pedro, Balaji, Shyam, \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D
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 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	2010-12-17T00:00:00Z
Keywords	"extragalactic object reported", "0102 272", "ionized absorber", "additional spectral components", "rosat pspc", "kev energy distribution", "kev energy band", "rosat data", "ROSAT", "photon index", "object confirms"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Thomas Boller, 2010, 'SQUARE_BRACKET_OPENHB89SQUARE_BRACKET_CLOSE 0102-272: a quasar with an extremely steep soft photon indexquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-d8zxhw4