Namir E. Kassim¹

¹ Naval Research Laboratory, Washington, DC 20375-5320

E-mail contact: Namir.Kassim@nrl.navy.mil

Radio photons are both cheap and virtuous. Exceedingly easy to make, they can trace both low energy, low efficiency processes, as well as high energy astrophysics phenomena. Once produced, they often suffer relatively little interaction with interstellar matter and can propagate over Galactic distances. Both of these properties are useful for probing the Galactic center, and radio observations have been key in demonstrating the uniqueness of the Galactic center within the Milky Way. Low radio frequency observations can be particularly useful in this regard as they can trace the interaction between thermal and non-thermal gasses. Here I review recent progress in radio observations of the GC, with an emphasis on low radio frequency observations. Topics to be covered include

• 74 and 330 MHz imaging of the GC region
• An ongoing GC transient monitoring campaign
• Utilizing HII absorption regions to probe the radial distribution of cosmic rays towards the GC
• Searching for new non-thermal filaments (NTFs), modeling of known NTFs
• Searching for GC pulsars, exploring scattering properties in the GC environs
• Finding and constraining GC HII region physical parameters
• Finding new supernova remnants (SNRs), investigating known SNRs, utilizing these and other nonthermal sources as probes of low density ionized gas along the line of site to the GC