Interstellar Medium in the Large Magellanic Cloud in Front of SN1987A

Details Interstellar Medium in the Large Magellanic Cloud in Front of SN1987A Interstellar Medium in the Large Magellanic Cloud in Front of SN1987A

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........5x&link_type=abstract

Thesis (PH.D.)--COLUMBIA UNIVERSITY, 1995.Source: Dissertation Abstracts International, Volume: 56-11, Section: B, page: 6176.

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Superbubble N157C

Scientific paper

This thesis presents a comprehensive and unique picture of structure, kinematics and evolution of the interstellar medium (ISM) in the Large Magellanic Cloud (LMC) in front of SN1987A. Using the light echoes from the supernova, I constructed for the first time a three-dimensional (3D) map of all the large scale ISM structures from 100 to 3500 light years in SN1987A foreground. This 3D map closely parallels the kinematic structure revealed by a high resolution spectroscopic survey on a 6^' x 6^' region around SN1987A. Both results agree very well with those of H alpha image, radio emission, X-ray, and interstellar emission and absorption lines. I found that superbubble N157C, centered on the rich cluster LH90, is 230 pc diameter, 7 times 10^6 -year-old, expanding at 10km s^{ -1} in radius with a total energy of a few times1051ergs. N157C is the far side of a giant 3 times 10^7 year old, 600 pc diameter superbubble, which had recently blown out of the HI disk of LMC. Two other components, V_{HEL }=255 and 245 km s^{ -1} are located at about 130 pc in front of SN1987A. Two high velocity components, 300 and 313 km s^{-1}, originate from the far side of SN1987A. There are two components at 259 and 301 km s^{-1} within 20^{''} from SN1987A probably due to the emission from the red supergiant wind. The time it took the SN1987A progenitor to move to the current location is comparable to the lifetime of N157C.

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