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Blazar nuclei in radio-loud narrow-line Seyfert 1?
Maraschi, L.; Ghisellini, G.; Tavecchio, F. +3 more
It has been suggested that some radio-loud narrow-line Seyfert 1 contain relativistic jets, on the basis of their flat-spectrum radio nuclei and studies on variability. We present preliminary results of an ongoing investigation of the X-ray and multiwavelength properties of 5 radio-loud NLS1 based on archival data from Swift and XMM-Newton. Some s…
Is Vela Jr. a young supernova remnant?
Katsuda, Satoru; Mori, Koji; Tsunemi, Hiroshi
The supernova remnant RX J0852.0-4622 (or Vela Jr.) has been considered to be very young (∼680 yr) based mainly on the possible detection of a radioactive decay line of 44Ti whose lifetime is only ∼90 yr. Here, we report on expansion measurements of the northwestern rim of this remnant, based on XMM-Newton observations separated by 6.5 …