Search Publications
A search for thermal X-ray emission from the composite supernova remnant G21.5-0.9 with Suzaku
Raycheva, Nergis C.; Sezer, Aytap
G21.5-0.9 is a young plerionic composite supernova remnant (SNR) hosting a bright pulsar wind nebula. The previous X-ray studies reported that the X-ray spectrum of the entire SNR can be fitted with a non-thermal spectral model, while the recent Chandra studies have pointed out that its X-ray spectrum also shows weak thermal emission. With this mo…
Galactic component mapping of galaxy UGC 2885 by machine learning classification
Holwerda, Benne W.; Barmby, Pauline; Kwik, Robin J. +1 more
Automating classification of galaxy components is important for understanding the formation and evolution of galaxies. Traditionally, only the larger galaxy structures such as the spiral arms, bulge, and disc are classified. Here we use machine learning (ML) pixel-by-pixel classification to automatically classify all galaxy components within digit…
X-ray investigation of the X-ray source 1RXS J121902.7-630910 with Suzaku
Bakis, Hicran; Raycheva, Nergis C.; Sezer, Aytap +1 more
We present a study of the unidentified X-ray source 1RXS J121902.7-630910 based on Suzaku X-ray Imaging Spectrometer observation. We aim at clarifying the nature of the emission from 1RXS J121902.7-630910. We found that the spectrum is well represented by a thermal plasma model with an electron temperature of kTe ∼ 3.7 keV, the upper li…
Galactic cosmic ray transport in inner heliosphere: Study with ion chamber and neutron monitor data for 1936-2006
Modzelewska, R.; Ahluwalia, H. S.; Gololobov, P. Yu.
Galactic cosmic ray (GCR) solar diurnal variation data recorded by shielded ion chambers at Cheltenham/Fredericksburg (CH-IC) and Yakutsk (Yak-IC) are corrected for diurnal temperature variation in upper atmosphere and used to calculate the ratio α of GCR free paths normal (λ⊥) and parallel (λ||) to mean interplanetary magnetic field (I…