Phase-resolved NuSTAR and Swift-XRT Observations of Magnetar 4U 0142+61

We present temporal and spectral analysis of simultaneous 0.5-79 keV Swift-XRT and NuSTAR observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ~20%, similar to that observed in 1E 1841-045 and much lower than the ~80% pulse fraction observed in 1E 2259+586. We do not detect the 55-ks phase modulation reported in previous Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV is dominated by a hard power law with a photon index, $\Gamma$ ~ 0.65, and the spectrum below 20 keV can be described by two blackbodies, a blackbody plus a soft power law, or by a Comptonized blackbody model. We study the full phase-resolved spectra using the electron-positron outflow model of Beloborodov (2013). Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoet et al. (2014). We find that a significant degeneracy appears in the inferred parameters if the footprint of the j-bundle is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced when the footprint is required to be the hot spot inferred from the soft X-ray data.Comment: 14 pages, 8 figures, 4 tables. Accepted for publication in Ap

Selection and breeding of tomato for organic conditions

[EN] One of the main aims of the H2020 Framework Programme BRESOV project is the development of tomato materials specifically adapted to organic agriculture. Germplasm of potential interest for organic agriculture was assembled in a core collection (CC; 233 accessions) for pre-breeding, and in a breeding set (BS; 217 accessions) for selection and breeding. Both the CC and BS have been characterized for multiple morphological, agronomic, and quality traits under organic conditions in Italy and Spain. Also, the CC and BS, and a collection of EMS mutants have been characterized for tolerance to drought and high temperature. A wide diversity was found in the materials for most traits. Most of the cultivated tomato materials of the CC and BS were also genotyped using the high-throughput ddRAD sequencing technique revealing a high genetic diversity in the collection and allowing the detection of candidate genes and associations for relevant traits under organic conditions. The screening of BS for several diseases (Phytophthora, Fusarium, TSWV, ToMV) has allowed the identification of new sources of tolerance and resistance. A selected set of materials has been screened both in Italy and in Spain under control, drought and low N fertilization conditions, and resilient materials under these conditions have been identified. Hybrids obtained between selected materials has allowed the identification of promising hybrids heterotic for yield and with high fruit quality. In addition, several backcross programmes have been undertaken in order to introduce resistance to several diseases, and advanced backcrosses with introgressed resistances have been obtained. New intraspecific and interspecific hybrids have been developed and tested as rootstocks. Some of them outperformed control rootstocks commonly used for grafting tomato. The new improved tomato materials specifically selected for organic conditions can have a dramatic impact in the production of organically grown tomato.This research has been funded by the European Union's Horizon 2020 Research and Innovation Programme under grant agreement No. 774244 (BRESOV project).Prohens Tomás, J.; Soler Aleixandre, S.; Tripodi, P.; Campanelli, G.; Sestili, S.; Figás-Moreno, MDR.; Casanova-Calancha, C.... (2022). Selection and breeding of tomato for organic conditions. Acta Horticulturae. 1354:95-103. https://doi.org/10.17660/ActaHortic.2022.1354.1395103135