A starburst region around l = 347° − 350°

Multi - frequency polarimetry of the Galactic radio background around 350 MHz : I . A region in Auriga around l = 161 ◦ , b = 16 ◦

With the Westerbork Synthesis Radio Telescope (WSRT), multi-frequency polarimetric images were taken of the diffuse radio synchrotron background in a ∼ 5◦×7◦ region centered on (l, b) = (161◦, 16◦) in the constellation of Auriga. The observations were done simultaneously in 5 frequency bands, from 341 MHz to 375 MHz, and have a resolution of ∼ 5.0′×5.0′ cosec δ. The polarized intensity P and po...

Multi - frequency polarimetry of the Galactic radio background around 350 MHz : II . A region in Horologium around l = 137 ◦ , b = 7 ◦

We study a conspicuous ring-like structure with a radius of about 1.4 which was observed with the Westerbork Synthesis Radio Telescope (WSRT) at 5 frequencies around 350 MHz. This ring is very prominent in Stokes Q and U , and less so in polarized intensity P . No corresponding structure is visible in total intensity Stokes I , which indicates that the ring is created by Faraday rotation and de...

Extended Hot Gas Halos Around Starburst Galaxies

Reanalysis of Einstein IPC data and new observations from the GINGA LAC indicate the presence of extended X-ray emission (10-50 kpc) around the starburst galaxy M82. Here we model this emission by calculating numerical hydrodynamic simulations of the starburst event to much later times and larger scales than previously considered. For our models, we adopt a supernova rate of 0.1 yr, and an exte...

Bez nazwy-347

Dynamical Expansion of Ionization and Dissociation Front around a Massive Star : a Starburst Mechanism

We quantitatively examine the significance of star formation triggered in the swept-up shell around an expanding H II region. If the swept-up molecular gas is sufficiently massive, new OB stars massive enough to repeat the triggering process will form in the shell. We determine the lower limit (Mthr) for the mass of the star that sweeps up the molecular gas, where at least one new star with mas...