Conveners
Friday Morning: Data Science & Simulations
- Darren Reed (University of Zurich)
Friday Morning: SKACH Science
- Daniel Schaerer (University of Geneva)
I will give an overview of the Sky Simulations work package, including a summary of recent activities, future plans and goals.
I'll discuss the first results from the Phoebos Simulation
I will summarise results on modelling HI from different hydro simulations using analytical field level model. I will then give an update on the method and the code 'Hi-Fi mocks' to generate arbitrary large 3D HI mocks from smaller hydro-simulations. Finally I will show how robustly one can recover the input cosmology from these mocks using power spectrum and use these results to forecast the...
In the study of the Universe, particularly galactic dynamics,
hydrodynamical simulations have played a critical role. Finely-tuned on a wide range of scales, recent large-scale simulation suites have produced mock observations that are nearly indistinguishable from actual observations.
In comparison to traditional machine learning techniques, the
complexity of these models poses a...
We present 𝚝𝚊𝚋𝚊𝚜𝚌𝚊𝚕, (𝐓r𝐀jectory 𝐁𝐀sed RFI 𝐒ubtraction and 𝐂𝐀𝐋ibration), a new algorithm that jointly models the RFI signal, trajectory, antenna gains, and residual visibilities to recover RFI-free interferometry data. We show that 𝚝𝚊𝚋𝚊𝚜𝚌𝚊𝚕 improves image quality beyond what is achieved with the standard flagging approach as well as existing RFI subtraction techniques. 𝚝𝚊𝚋𝚊𝚜𝚌𝚊𝚕 has been...
The nature of sources that led to the last phase transition of matter in the Universe, namely the cosmic reionization, remains an open question in astrophysics. It is widely believed that low-mass star-forming galaxies (emission lines galaxies, Lyman alpha emitters and related objects) are the major contributors to reionization. Thus they have been intensely studied at multiple wavelengths...
The Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) is a radio interferometer array under development and to be deployed at the South African Radio Astronomy Observatory (SARAO) Square Kilometer Array (SKA) site in South Africa. HIRAX is entering in the deployment phase of the initial 256-element array of 6m dishes. I will present an overview of the HIRAX instrument and planned...
Observation of the 21cm signal through intensity mapping is a promising probe of large-scale structures in the universe. The central challenge of 21 cm intensity mapping is that the method is highly sensitive to the bright astrophysical foregrounds. Traditional component separation requires exquisite spectral purity to subtract the foreground components with smooth spectral responses from the...
I will outline the key science drivers of SKA1-MID observations in the frequency range 15-25 GHz (and in some cases up to 50 GHz). Additionally I will summarize the "observatory landscape" (e.g., ngVLA, ALMA band 1, synergies with other southern hemisphere facilities) such a high-frequency capability would operate in. Finally, this talk would also aim to garner momentum for a document...
