Far-ultraviolet observations of the Monogem ring

Abstract

We present the results of far-ultraviolet (FUV) observations of the Monogem ring made with the FIMS/SPEAR instrument. The global map constructed from the C IV lambda lambda 1548, 1550 emission lines presents clear evidence of the interaction of the Monogem ring with the ambient medium. The image shows a half-ring feature in the low-latitude region, with its peak along the distorted boundary of the X-ray ring, where hot gas is in direct contact with the newly found H alpha ring (the Gemini H alpha ring) centered at (l, b) similar to (191.5 degrees, +5.0 degrees). Only a small portion of the X-ray ring is bright in C IV in the high-latitude region, where hot gas is seen to extend to a great distance from the ring. We have also detected other ionic emission lines in several regions of the Monogem ring, such as C III lambda 977, O VI lambda lambda 1032, 1038, Si II* lambda 1533, He II lambda 1640, and O III] lambda 1666.