GBT22A-437

SC: GBT Diffuse Ionized Gas Survey at Low frequencies -- GDIGS-Low

Abstract

This proposal is for the special call. The properties of the ionized gas in the Galactic plane have remained largely undetermined. Hydrogen radio recombination lines (HRRLs) at low frequencies are unique probes of the physical conditions of ionized gas (density and path length). We propose to carry out a survey of low-frequency HRRLs, GBT Diffuse Ionized Gas Survey at Low frequencies (GDIGS-Low), to complement the GDIGS survey. Through this survey we will answer the following questions (i) What are the physical properties of the WIM?, (ii) How are the physical properties of the WIM affected by radiative feedback?, (iii) What is the relationship between the WIM and HII regions?, (iv) Are the O stars the only source of ionization for the WIM? and (v) What is the contribution of the WIM to the global emission from Milky Way type galaxies?

Investigators

Name	Institution
Pedro Salas *	Green Bank Observatory
GBT Operator	Green Bank Observatory
Matteo Luisi	Westminster College
Trey Wenger	Wisconsin at Madison, University of
Allison Smith	National Astronomy and Ionosphere Center ; Georgia, University of
Leonardo Supan	Instituto de Astronomía y Física del Espacio
Gabriela Castelletti	Instituto de Astronomía y Física del Espacio
Anish Roshi	National Radio Astronomy Observatory; National Astronomy and Ionosphere Center
Loren Anderson	West Virginia University
Kimberly Emig	National Radio Astronomy Observatory

* indicates the PI