Identified radio supernova remnants (SNRs) in the Galaxy comprise an incomplete sample of the SNR population due to various selection effects. ROSAT performed the first All-Sky Survey (RASS) with an imaging X-ray telescope and thus provided another window for finding SNRs and compact objects that may reside within them. Meanwhile, 14 new SNRs were identified in multi-wavelength identification campaigns based on this RASS data (cf. Prinz & Becker 2012 for a summary). The current list of RASS SNR candidates still includes 72 sources. All have a diameter of > 5’, are at a low Galactic latitude (|b| < 15 deg) and have a signal-to-noise ratio greater than 4𝜎. Of these candidates, 44 have an diameter of less than 30′, 9 between 30′ - 60′, 4 between 60′ - 120′, and 15 have a diameter larger than 120′. Additional ~300 SNR candidates are listed in the Green catalog of galactic radio SNRs.
The eight eROSITA all-sky surveys, of which the first one started mid December 2019, will provide a sensitivity for diffuse sources located in the galactic plane of about an order of magnitude higher than what was available in the ROSAT All-Sky Survey. It supports to continue the previous SNR identification campaign and to search for new supernova remnants and compact remnants residing in them with un unprecedented sensitivity.
|Presenter status||eROSITA consortium member|