期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
卷 39, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/pasa.2021.59
关键词
Small Magellanic Cloud; Hi line emission; dwarf irregular galaxies; interstellar medium
资金
- Australian Government
- National Collaborative Research Infrastructure Strategy
- Government of Western Australia
- Science and Industry Endowment Fund
- Australian Research Council (ARC) [DP190101571]
- ARC through Future Fellowship [FT150100024]
- State Agency for Research of the Spanish MCIU (FEDER) [AYA2017-84390-C2-1-R, PID2020-114461GB-I00]
- State Agency for Research of the Spanish MCIU, through 'Center of Excellence Severo Ochoa' award [SEV-2017-0709]
- NSF Astronomy and Astrophysics Postdoctoral Fellowship [AST1801471]
- Swinburne University's Centre of Astrophysics and Supercomputing [oz145]
We present the most sensitive and detailed view of the neutral hydrogen emission associated with the Small Magellanic Cloud (SMC). The observations reveal HI on similar physical scales as other important tracers of the interstellar medium, providing valuable information about spatial scales and density distribution. These data have significant scientific potential.
We present the most sensitive and detailed view of the neutral hydrogen (HI) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilot survey. These GASKAP-HI pilot observations, for the first time, reveal HI in the SMC on similar physical scales as other important tracers of the interstellar medium, such as molecular gas and dust. The resultant image cube possesses an rms noise level of 1.1K (1.6 mJy beam(-1)) per 0.98 km s(-1) spectral channel with an angular resolution of 30 (similar to 10 pc). We discuss the calibration scheme and the custom imaging pipeline that utilises a joint deconvolution approach, efficiently distributed across a computing cluster, to accurately recover the emission extending across the entire similar to 25 deg(2) field-of-view. We provide an overview of the data products and characterise several aspects including the noise properties as a function of angular resolution and the represented spatial scales by deriving the global transfer function over the full spectral range. A preliminary spatial power spectrum analysis on individual spectral channels reveals that the power law nature of the density distribution extends down to scales of 10 pc. We highlight the scientific potential of these data by comparing the properties of an outflowing high-velocity cloud with previous ASKAP+Parkes HI test observations.
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