Showing results for: [ Magellanic Clouds ]
We report the direct detection of cold HI gas in a cloud ejected from the Small Magellanic Cloud (SMC) towards the Magellanic Stream.
The cloud is part of a fragmented shell of HI gas on the outskirt... mores of the SMC. This is the second direct detection of cold HI associated with the Magellanic Stream using absorption. The cold gas was detected using 21-cm HI absorption-line observations with the Australia Telescope Compact Array (ATCA) towards the extra-galactic source PMN J0029-7228.
We find a spin (excitation) temperature for the gas of 68+-20 K.
We suggest that breaking super shells from the Magellanic Clouds may be a source of cold gas to supply the rest of the Magellanic Stream.less
Australia Telescope National Facility - C3297 - Follow-up observations of HI absorption near the SMC detected by ASKAP - Published 17 Jun 2020
This survey project represents observations made during the ASKAP pilot survey phase but not associated with any of the survey science projects or observatory projects. This could include technical te... morest observations designed to verify new or improved modes of operation and processing, showcase observations designed to demonstrate the capabilities of the telescope, targets of opportunity not covered by an SSP, and possible guest science time, although this is not expected to begin until after the pilot phase has ended and will receive a different code at that time.less
Australia Square Kilometre Array Pathfinder - AS113 - Other ASKAP pilot science including tests, TOOs or guest observations - Published 26 May 2020
These observations will form part of the ASKAP pilot survey program. This is a joint exercise between CASS and the ASKAP Survey Science Teams to conduct a series of observations to learn how to conduc... moret large-scale surveys using the full capabilities of this new telescope. The key goal of the pilot survey program is to establish readiness for full survey operations, including determining and testing observing and processing strategies, and data validation and release. The observations collected here are primarily for GASKAP.less
Australia Square Kilometre Array Pathfinder - AS108 - ASKAP Pilot Survey for GASKAP - Published 01 May 2020
We propose to search for a pulsar in the remnant of SN1987A. The existence of a neutron star formed after the explosion of the progenitor, Sk ?69?202, is predicted by stellar evolution theory. Early n... moreeutrino detection by three separate ground-based detectors appears to confirm the formation of neutrons. Moreover, recent Compact Array observations hint at the presence of a flat-spectrum component near the centre of the remnant, possibly the result of synchrotron emission from a pulsar-powered nebula. However, the initial mass of the SN1987A progenitor is close to the limit where collapse into a black hole is predicted. It is therefore possible that fallback of matter onto the neutron star resulted in later formation of a black hole, or even a quark star. Detection or otherwise of the SN1987A pulsar would make a powerful contribution to stellar evolution theory.less
Australia Telescope National Facility - P834 - Searching for the pulsar in SN1987A - Published 06 May 2017
We request 35 hours to survey the Small Magellanic Cloud using the 20-cm multibeam receiver together with the recently developed Berkeley-Parkes-Swinburne data recorder. This survey represents up to ... morean order of magnitude improvement in sensitivity for millisecond pulsars and short duration transient radio sources in the Small Magellanic Cloud and will allow us to place new constraints on the populations of these sources. If the proposed observations result in new discoveries, we intend to extend this survey to the Large Magellanic Cloud with the ultimate goal of studying the neutron star populations in these two external galaxies.less
Australia Telescope National Facility - P682 - A high time resolution survey of the Small Magellanic Cloud - Published 11 Dec 2015
Australia Telescope National Facility - P834 - Searching for the pulsar in SN1987A - Published 22 Apr 2014
We request 136 hours to survey the Large Magellanic Cloud using the 20-cm multibeam receiver together with the BPSR pulsar data recorder. This survey represents up to an order of magnitude improvemen... moret in millisecond pulsar (MSP) sensitivity over previous LMC surveys. Successful completion of this project will allow us to place new constraints on the MSP and short duration radio source populations of the LMC.less
Australia Telescope National Facility - P743 - A high time resolution survey of the Large Magellanic Cloud - Published 14 Sep 2013