A dataset provided by the European Space Agency

Name: Probing Galactic Center MeV-GeV Cosmic-ray Population with Sgr B2 Fe K Emission
Published: 2019-05-04T22:00:00Z

Proposal ID	080241
Title	Probing Galactic Center MeV-GeV Cosmic-ray Population with Sgr B2 Fe K Emission
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0802410101
DOI	https://doi.org/10.5270/esa-ymfjpzv
Principal Investigator, PI	Dr Shuo Zhang
Abstract	It has been a long-standing challenge to probe cosmic-ray particles at thecenter of our Galaxy. Low energy cosmic-ray protons (LECRp) with energies of MeVto GeV can produce 6.4 keV Fe K-alpha line and continuum X-ray emission throughinteraction with cold molecular materials. The Fe K-alpha emission from thedensest Galactic Center molecular cloud Sgr B2 has been decaying for the pastdecade, which has been dominated by reflection of a past Sgr A* X-ray outburst.However, as the X-ray reflection component keeps fading, a constant Fe K-alphaemission component will take the stage beginning early 2017. The flux level ofthe Sgr B2 Fe K- alpha emission measured in 2017-2018 will for the first timeput strong constraints on the MeV- GeV cosmic-ray proton population, not previously achievable.
Publications	Searches for pulsar-like candidates from unidentified objects in the Third Catalog of Hard Fermi-LAT Sources with machine learning techniques \|Hui, C. Y., Lee, Jongsu, et al. \| MNRAS \| 495-1093 \| 2020 \| 2020MNRAS.495.1093H \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.495.1093H New Constraints on Cosmic Particle Populations at the Galactic Center Using X-Ray Observations of the Molecular Cloud Sagittarius B2 \|Rogers, Field, Zhang, Shuo, et al. \| ApJ \| 934-19 \| 2022 \| 2022ApJ...934...19R \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...934...19R Long-term X-ray spectral variation of the Wolf-Rayet binary WR 102-1 in the Galactic bulge: evidence for wind distortion in the binary \|Nagatsuka, Tomoki, Sugawara, Yasuharu, \| MNRAS \| 515-1897 \| 2022 \| 2022MNRAS.515.1897N \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.515.1897N From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez, Antonio C., \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2018-04-02T00:59:38Z/2018-04-03T05:36:18Z
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	2019-05-04T22:00:00Z
Keywords	"flux level", "alpha line", "cold molecular materials", "past sgr", "sgr b2 fe", "kev fe", "continuum xray emission", "constant fe", "alpha emission component", "past decade", "xray outburst", "alpha emission", "2017 2018", "xray reflection component"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Shuo Zhang, 2019, 'Probing Galactic Center MeV-GeV Cosmic-ray Population with Sgr B2 Fe K Emission', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ymfjpzv