X-ray Emission from an Expanding Supergiant Shell in Ic 2574
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چکیده
We present a multi–wavelength study of a supergiant shell within the violent interstellar medium of the nearby dwarf galaxy IC2574, a member of the M81 group of galaxies. Neutral hydrogen (H I) observations obtained with the Very Large Array (VLA) reveal a prominent expanding supergiant H I shell in the northeast quadrant of IC 2574 which is thought to be produced by the combined effects of stellar winds and supernova explosions. It measures roughly 1000 × 500 pc in size and is expanding at about 25 km s. The H I data suggest an age of about 1.4 × 10 yrs; the energy input must have been of order (2.6 ± 1) × 10 ergs. Massive star forming regions, as traced by Hα emission, are situated predominantly on the rim of this H I shell. This
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تاریخ انتشار 1998