Mapping the Hot ISM Using X-Ray Shadowing Towards Infrared Dark Clouds

Details Mapping the Hot ISM Using X-Ray Shadowing Towards Infrared Dark Clouds Mapping the Hot ISM Using X-Ray Shadowing Towards Infrared Dark Clouds

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1156...29a&link_type=abstract

THE LOCAL BUBBLE AND BEYOND II: Proceedings of the International Conference. AIP Conference Proceedings, Volume 1156, pp. 29-33

Mathematics

Logic

Dark Matter, X-Ray Sources, X-Ray Bursts, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Galactic Halos

Scientific paper

We made an X-ray shadowing experiment toward the infrared dark cloud (IRDC) G28.37+0.07 using XMM-Newton (OBSID 0302970301). X-ray shadowing is the only known method of determining the distribution of hot plasma in the plane of the Milky Way. IRDCs are ideal X-ray shadowing targets due to their very high column densities (~1021-1023 cm-2) and the fact that their distances can be derived from H I self-absorption studies and morphological matches with molecular gas. Our pilot study of three IRDCs focuses on clouds near 30° Galactic Longitude that have distances 3 to 5 kpc from the Sun. Here we focus on the best shadowing candidate of our pilot study, IRDC G28.37+0.07 which is ~5 kpc from the Sun. We are planning a larger X-ray shadowing survey that will cover multiple sky positions and map molecular clouds at varying distances along neighboring lines of sight. These data will allow us to determine the three-dimensional distribution of hot plasma in the Galactic plane. Such a map of the hot gas distribution will provide important information about the evolution of the interstellar medium and help constrain the energy balance and chemical evolution of our Galaxy.

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