Speaker
Daniel Lenz
(Universität Bonn)
Description
The correlation between neutral hydrogen and dust has been extensively studied since the IRAS mission. This led to important insights into gas and dust physics, the accretion history of the Milky Way and eventually the distribution of the CO-dark molecular gas. For a full-sky analysis, the spatial resolution of these studies was limited by the angular resolution of the HI data of about one degree. The recently finished Effelsberg-Bonn HI Survey (EBHIS) has improved this by a factor of more than five.
We aim to consistently relate the latest, most modern data of different dust and gas tracers for the entire Galaxy. This allows us to generate all-sky maps of e.g. the $X_{\rm CO}$ conversion factor, dust emissivity and the (CO-dark) molecular gas.
Among the data sets used for this study are EBHIS and the Galactic All Sky Survey (GASS) for the atomic neutral hydrogen, Planck and IRIS data for all the dust-related information and the diffuse Fermi LAT data which act as a tracer of the total hydrogen column density. The relation between this data is evaluated using a Bayesian model, utilising modern methods of inference and image analysis.
We present the first results of this work and compare our inferred values to other studies of smaller regions and individual objects in the Galaxy.
Author
Daniel Lenz
(Universität Bonn)