X-ray Measurements of ${}^{44}$Ti in Four Supernova Remnants

Abstract

We present the results of a search for scandium K${}_{\alpha }$ X-ray fluorescence resulting from ${}^{44}$Ti electron capture decay in four young supernova remnants. We analyzed archival XMM-Newton data from Tycho's SNR, Kepler's SNR, Cassiopeia A, and SN 1987A. We fit the X-ray spectra in regions of interest with up to four components, thermal and power-law, as needed to fit the spectrum, and add a gaussian to test for extra Sc emission. While all require the line with modest confidence, none represent definitive detections on their own, and all are consistent with previous gamma-ray detections or limits on the ${}^{44}$Ti mass.

arXiv comment18 pages, 11 figures, 9 tables

References in corpus (22)

• Supernova Remnants in the Sedov Expansion Phase: Thermal X-Ray Emission
• Asymmetries in core-collapse supernovae from maps of radioactive ${}^{44}$Ti in CassiopeiaA
• Tycho Brahe's 1572 supernova as a standard type Ia explosion revealed from its light echo spectrum
• The Youngest Galactic Supernova Remnant: G1.9+0.3
• A Deep Chandra Observation of Kepler's Supernova Remnant: A Type Ia Event with Circumstellar Interaction
• Hard X-ray emission lines from the decay of Ti-44 in the remnant of supernova 1987A
• The distribution of radioactive ${}^{44}$Ti in Cassiopeia A
• The signature of 44Ti in Cassiopeia A revealed by IBIS/ISGRI on INTEGRAL
• Helium Shell Detonations on Low Mass White Dwarfs as a Possible Explanation for SN 2005E
• Detection of the 67.9 keV and 78.4 keV lines associated with the radioactive decay of Ti-44 in Cassiopeia A
• On the fate of the secondary white dwarf in double-degenerate double-detonation Type Ia supernovae
• Explosive Nucleosynthesis in Sub-Chandrasekhar Mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters
• Radioactive Scandium in the Youngest Galactic Supernova Remnant G1.9+0.3
• A Spatially Resolved Study of the Synchrotron Emission and Titanium in Tycho's Supernova Remnant with NuSTAR
• ${}^{44}\mathrm{Ti}$ ejecta in young supernova remnants
• Radio Observations of Supernova Remnant G1.9+0.3
• Galactic survey of 44Ti sources with the IBIS telescope onboard INTEGRAL
• Swift/BAT detection of hard X-rays from Tycho's Supernova Remnant: Evidence for Titanium-44
• Thermal Emission and Radioactive Lines, but No Pulsar, in the Broadband X-Ray Spectrum of Supernova 1987A
• On the Hadronic Gamma-ray Emission from Tycho's Supernova Remnant
• Spatial distribution of X-ray emitting ejecta in Tycho's SNR: indications of shocked Titanium
• Hard X-ray emission and ${}^{44}$Ti line features of Tycho Supernova Remnant