A dataset provided by the European Space Agency

Name: 26Al line shift from the closest massive star group
Published: 2025-03-25T09:54:38Z

Proposal ID	1220035
Obs ID	12200350001
Title	26Al line shift from the closest massive star group
Download Data Associated to the proposal	https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:1220035
DOI	https://doi.org/10.57780/esa-kdkxzh2
Author	Krause
Abstract	Our group has recently found a systematic shift of the centroid of the 26Al emission line at 1.8 MeV across the inner part of the Galactic plane, inconsistent with Galactic rotation, but consistent with a spiral arm population of 26Al sources with an excess velocity of about 200 km s-1 away from spiral arms. We have suggested that this velocity offset may be due to an interaction of the superbubbles generated by the massive star groups that also produce the 26Al with dense gas in the spiral arms of the Milky Way. This interpretation implies that 26Al stays at least for some time entirely within the hot, tenuous gas, because colder gas (HI, H2) is known to possess much smaller velocities. Because it is not possible to resolve the Galactic plane signal into individual components attributable to individual groups of stars, we propose to test the scenario further with observations of the nearby star forming region in Scorpius-Centaurus (Sco-Cen). The region has produced an X-ray bright superbubble, which indicates recent supernova activity. In our scenario, we expect the 26Al to be distributed similarly to the X-ray bright gas, which moves at its sound speed of around 500 km/s. Any projection on to the line of sight very likely results in detectable 26Al velocity shifts. An earlier INTEGRAL campaign detected the 1.8 MeV line at above 5 significance, but could constrain the line shift only to 13775 km s-1 (towards Earth), i.e. consistent with zero within 2. We propose therefore more observations of Sco-Cen to improve the error on the line shift and map 26Al within the Sco-Cen superbubble.
Publications	Background modelling for I3-ray spectroscopy with INTEGRAL/SPI - Siegert, Thomas, Diehl, Roland,Weinberger, Christoph,Pleintinger, Moritz M. M.,Greiner, Jochen,Zhang, Xiaoling (2019-06-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...626A..73S Comparing simulated ²⁶Al maps to gamma-ray measurements - Pleintinger, Moritz M. M., Siegert, Thomas,Diehl, Roland,Fujimoto, Yusuke,Greiner, Jochen,Krause, Martin G. H.,Krumholz, Mark R. (2019-12-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...632A..73P Diffuse Galactic emission spectrum between 0.5 and 8.0 MeV - Siegert, Thomas, Berteaud, Joanna,Calore, Francesca,Serpico, Pasquale D.,Weinberger, Christoph (2022-04-01) http://ui.adsabs.harvard.edu/#abs/2022A&A...660A.130S Extreme relativistic electron fluxes in the Earths outer radiation belt: Analysis of INTEGRAL IREM data - Meredith, Nigel P., Horne, Richard B.,Sandberg, Ingmar,Papadimitriou, Constantinos,Evans, Hugh D. R. (2017-07-01) http://ui.adsabs.harvard.edu/#abs/2017SpWea..15..917M Fermi Transient J1544{dash}0649: A Flaring Radio-weak BL Lac - Bruni, Gabriele, Panessa, Francesca,Ghisellini, Gabriele,Chavushyan, Vahram,Pena-Herazo, Harold A.,Hernandez-Garcia, Lorena,Bazzano, Angela,Ubertini, Pietro,Kraus, Alex (2018-02-01) http://ui.adsabs.harvard.edu/#abs/2018ApJ...854L..23B First analysis of eight Algol-type binaries: EI Aur, XY Dra, BP Dra, DD Her, VX Lac, WX Lib, RZ Lyn, and TY Tri - Zasche, P., (2016-01-01) http://ui.adsabs.harvard.edu/#abs/2016NewA...42....1Z Gamma-Ray Emission of ⁶⁰Fe and ²⁶Al Radioactivity in Our Galaxy - Wang, W., Siegert, T.,Dai, Z. G.,Diehl, R.,Greiner, J.,Heger, A.,Krause, M.,Lang, M.,Pleintinger, M. M. M.,Zhang, X. L. (2020-02-01) http://ui.adsabs.harvard.edu/#abs/2020ApJ...889..169W INTEGRAL/SPI {$gamma$}-ray line spectroscopy. Response and background characteristics - Diehl, Roland, Siegert, Thomas,Greiner, Jochen,Krause, Martin,Kretschmer, Karsten,Lang, Michael,Pleintinger, Moritz,Strong, Andrew W.,Weinberger, Christoph,Zhang, Xiaoling (2018-03-01) http://ui.adsabs.harvard.edu/#abs/2018A&A...611A..12D New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations - Krivonos, Roman A., Tsygankov, Sergey S.,Mereminskiy, Ilya A.,Lutovinov, Alexander A.,Sazonov, Sergey Yu.,Sunyaev, Rashid A. (2017-09-01) http://ui.adsabs.harvard.edu/#abs/2017MNRAS.470..512K Primordial black hole dark matter in the context of extra dimensions - Friedlander, Avi, Mack, Katherine J.,Schon, Sarah,Song, Ningqiang,Vincent, Aaron C. (2022-05-01) http://ui.adsabs.harvard.edu/#abs/2022PhRvD.105j3508F Searching for redshifted 2.2 MeV neutron-capture lines from accreting neutron stars: Theoretical X-ray luminosity requirements and INTEGRAL/SPI observations - Ducci, L., Santangelo, A.,Tsygankov, S.,Mushtukov, A.,Ferrigno, C. (2024-10-01) http://ui.adsabs.harvard.edu/#abs/2024A&A...690A.309D ²⁶Al gamma rays from the Galaxy with INTEGRAL/SPI - Pleintinger, Moritz M. M., Diehl, Roland,Siegert, Thomas,Greiner, Jochen,Krause, Martin G. H. (2023-04-01) http://ui.adsabs.harvard.edu/#abs/2023A&A...672A..53P Swift, NuSTAR, and INTEGRAL observations of the symbiotic X-ray binary IGR J16194-2810 - Bozzo, E., Romano, P.,Ferrigno, C.,Ducci, L. (2024-01-01) http://ui.adsabs.harvard.edu/#abs/2024MNRAS.527.3585B The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR - Perez, Kerstin, Krivonos, Roman,Wik, Daniel R. (2019-10-01) http://ui.adsabs.harvard.edu/#abs/2019ApJ...884..153P The INTEGRAL/IBIS AGN catalogue: an update - Malizia, A., Landi, R.,Molina, M.,Bassani, L.,Bazzano, A.,Bird, A. J.,Ubertini, P. (2016-07-01) http://ui.adsabs.harvard.edu/#abs/2016MNRAS.460...19M VerticaVertical position of the Sun with gamma-rays - Siegert, Thomas, (2019-12-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...632L...1S Water megamaser emission in hard X-ray selected AGN - Panessa, F., Castangia, P.,Malizia, A.,Bassani, L.,Tarchi, A.,Bazzano, A.,Ubertini, P. (2020-09-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...641A.162P X-ray absorption in INTEGRAL active galactic nuclei. Host galaxy inclination - Malizia, A., Bassani, L.,Stephen, J. B.,Bazzano, A.,Ubertini, P. (2020-07-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...639A...5M
Temporal Coverage	2015-01-27T16:20:11Z / 2015-02-01T15:15:51Z
Version	1.0
Mission Description	The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact	https://www.cosmos.esa.int/web/integral/helpdesk
Date Published	2025-03-25T09:54:38Z
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Krause, 2025, '26Al line shift from the closest massive star group', 1.0, European Space Agency, https://doi.org/10.57780/esa-kdkxzh2