Speaker
Description
Radio surveys of the Galactic Plane are essential for understanding how the Milky Way evolves, what it is composed of, and what emission processes take place. Low radio frequencies are particularly useful for constraining the distribution of cosmic rays and magnetic fields, as well as studying the spectral properties of pulsars and the diffuse emission of supernova remnants.
The GLEAM-X survey is incrementally made available to the community as portions are completed. The first two data releases covered 14892 deg$^2$ of the extragalactic sky. We present here the third data release for the GLEAM-X survey, covering $\approx 3800$ deg$^2$ of the southern Galactic Plane (GP) with $233^{\circ} < l < 44^{\circ}$ and $|b| < 11^{\circ}$ over a frequency range of 72--300 MHz. However, GLEAM-X alone is not sensitive to the large-scale diffuse emission, abundant along the GP. To address this, we jointly deconvolved GLEAM-X data with the original GLEAM survey to recover spatial scales $45^{''} - 15^{\circ}$ - a capability unmatched by other low-frequency surveys - using a GPU-based Image Domain Gridding (IDG) extension of WSClean. This release represents the most detailed low-frequency survey of the GP to date, with only the SKA expected to produce deeper and broader coverage.
The GP release has an RMS noise level of 10-2 mJy beam$^{-1}$ across the observing band, and almost 90000 sources with spectral fitting. In this talk, we will present the new images and catalogues, and showcase some early science results including spectral studies of SNRs, HII regions classification and pulsar detections at low frequencies.
