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|Title:||The XMM-Newton view of the central degrees of the Milky Way||Authors:||PONTI, GABRIELE
Morris, M. R.
Warwick, R. S.
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||453||Issue:||1||First Page:||172||Abstract:||The deepest XMM-Newton mosaic map of the central 1.5 ° of the Galaxy is presented, including a total of about 1.5 Ms of EPIC-pn cleaned exposures in the central 15 arcsec and about 200 ks outside. This compendium presents broad-band X-ray continuum maps, soft X-ray intensity maps, a decomposition into spectral components and a comparison of the X-ray maps with emission at other wavelengths. Newly discovered extended features, such as supernova remnants (SNRs), superbubbles and X-ray filaments are reported. We provide an atlas of extended features within ±1° of Sgr A<SUP>⋆</SUP>. We discover the presence of a coherent X-ray-emitting region peaking around G0.1-0.1 and surrounded by the ring of cold, mid-IR-emitting material known from previous work as the `Radio Arc Bubble' and with the addition of the X-ray data now appears to be a candidate superbubble. Sgr A's bipolar lobes show sharp edges, suggesting that they could be the remnant, collimated by the circumnuclear disc, of an SN explosion that created the recently discovered magnetar, SGR J1745-2900. Soft X-ray features, most probably from SNRs, are observed to fill holes in the dust distribution, and to indicate a direct interaction between SN explosions and Galactic centre (GC) molecular clouds. We also discover warm plasma at high Galactic latitude, showing a sharp edge to its distribution that correlates with the location of known radio/mid-IR features such as the `GC Lobe'. These features might be associated with an inhomogeneous hot `atmosphere' over the GC, perhaps fed by continuous or episodic outflows of mass and energy from the GC region.||Acknowledgments:||This research has made use both of data obtained with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA, and data obtained from the Chandra Data Archive. We kindly acknowledge Sergio Molinari for providing the Herschel map, Casey Law for the GBT images and Namir Kassim for the VLA 90-cm map. GP acknowledges Roland Crocker, Barbara De Marco and Pierre Maggi for useful discussions. MC, AG, RT, SS acknowledge support from CNES. GP also acknowledges Frederick Baganoff and Nanda Rea for discussions about the origin of the lobes and the association with the SNR of SGR J1745−2900. We thank the referee for a careful reading of the paper. GP acknowledges support via an EU Marie Curie Intra-European Fellowship under contract no. FP7-PEOPLE-2012-IEF-331095. The GC XMM–Newton monitoring project is partially supported by the Bundesministerium für Wirtschaft und Technologie/Deutsches Zentrum für Luft- und Raumfahrt (BMWI/DLR, FKZ 50 OR 1408) and the Max Planck Society. Partial support through the COST action MP0905 Black Holes in a Violent Universe is acknowledged. We thank the ISSI in Bern.||URI:||http://hdl.handle.net/20.500.12386/29360||URL:||https://academic.oup.com/mnras/article/453/1/172/1747512||ISSN:||0035-8711||DOI:||10.1093/mnras/stv1331||Bibcode ADS:||2015MNRAS.453..172P||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 18, 2021
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