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  • richardmitnick 8:13 pm on July 20, 2021 Permalink | Reply
    Tags: "ASKAP searches for afterglow of gravitational wave", , , , , The ASKAP team found a source known as AT2019osy that had nearly doubled in brightness over the course of a week. The smoking gun of a radio afterglow?   

    From CSIROscope (AU): “ASKAP searches for afterglow of gravitational wave” 

    CSIRO bloc

    From CSIROscope (AU)

    at

    CSIRO (AU)-Commonwealth Scientific and Industrial Research Organisation

    24 Jun, 2020 [Just found this anchored to another article in social media]
    Annabelle Young

    1
    Scientists have made a new gravitational waves discovery. Image credit: C. Knox/ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav).

    Scientists are puzzled by a new gravitational waves discovery. Have they discovered the heaviest neutron star or the lightest black hole ever observed?

    More than a century ago, Albert Einstein predicted massive objects like neutron stars and black holes produce ripples in space as they orbit one another and eventually merge in a violent clash.

    Gravitational waves from a black hole merger were first detected in 2015. Two years later researchers found not only gravitational waves but gamma-rays, light and radio waves from the merger of a pair of neutron stars.

    The Laser Interferometer Gravitational-Wave Observatory (LIGO) discovered these gravitational waves or ‘ripples’ in space. It bagged three of its founders the 2017 Nobel prize in physics.

    3
    October 3, 2017
    The LIGO Laboratory, comprising LIGO Hanford, LIGO Livingston, Caltech, and MIT are excited to announce that LIGO’s three longest-standing and greatest champions have been awarded the 2017 Nobel Prize in Physics: Barry Barish and Kip Thorne of California Institute of Technology (US) and Rainer Weiss of Massachusetts Institute of Technology (US).

    The announcement was made this morning by the Nobel Committee in Stockholm Sweden. First broadcast live, you can watch the recording here: Nobel Prize in Physics Announcement.

    ______________________________________________________________________________________________________________

    Caltech /MIT Advanced aLigo .


    ______________________________________________________________________________________________________________

    LIGO’s system of lasers, mirrors and vacuum tubes make it the most precise ‘ruler’ on Earth. It’s capable of detecting these previously invisible ripples in space, which are smaller than the diameter of a proton.

    In August 2019, astronomers received an alert that LIGO had detected gravitational waves from a new type of event. The long-awaited merger of a suspected neutron star and a black hole!

    ASKAP on patrol for a gravitational waves discovery.

    Within minutes of receiving the alert, a team led by Professor Tara Murphy at The University of Sydney (AU) activated plans to use our ASKAP radio telescope [below]. They were searching for the afterglow produced by the merger.

    Because gravitational waves are so hard to detect, LIGO can’t pinpoint where these mergers occur. So, they send the astronomy community a ‘sky map’ indicating a region where the event happened. Often these maps cover as much as a quarter of the sky. This takes hundreds of hours to search using a regular telescope.

    ASKAP is equipped with novel receivers that give it a wide-angle lens on the sky. In one pointing, ASKAP can view an area of sky about the size of the Southern Cross.

    Coincidentally, the sky map sent by LIGO for the detection of this merger was about the same size as ASKAP’s field of view. This allowed Tara’s team to observe almost the whole area of the map at once.

    Nine days after the merger, the ASKAP team found a source known as AT2019osy that had nearly doubled in brightness over the course of a week. The smoking gun of a radio afterglow?

    “We immediately alerted thousands of astronomers involved in the gravitational wave follow-up effort, and telescopes across the world, and in space, began slewing to observe our candidate,” team member Dougal Dobie, a co-supervised PhD student at The University of Sydney and CSIRO said.

    False start but the tide’s rising.

    “Unfortunately, these observations suggested AT2019osy was produced by normal activity from the black hole at the centre of a galaxy and unrelated to the merger,” Dougal said.

    Continued ASKAP searches didn’t find any other candidates. This might seem disappointing but the ASKAP team say the effort was not wasted. A non-detection rules out several scenarios and helps place limits on the energy released during the merger.

    Hints of a deeper mystery

    Ongoing analysis of the LIGO data has shown the lack of a radio counterpart may even support the idea something unexpected is happening. The signal received by LIGO when a merger occurs depends on the mass of the two objects involved. Initial analysis suggested the merger of a neutron star and a black hole. But a recent announcement suggests this may not be the entire story.

    4
    In August of 2019, the LIGO-Virgo gravitational-wave network witnessed the merger of a black hole with 23 times the mass of our sun and a mystery object 2.6 times the mass of the sun. Scientists do not know if the mystery object was a neutron star or black hole, but either way it set a record as being either the heaviest known neutron star or the lightest known black hole. Image credit: R. Hurt (Caltech IPAC-Infrared Processing and Analysis Center (US)) Caltech/ MIT Advanced aLIGO (US)/California Institute of Technology (US)/Massachusetts Institute of Technology (US).

    “We may have discovered either the heaviest neutron star or the lightest black hole ever observed. If it really is a heavy neutron star, this will radically alter our understanding of nuclear matter in the densest, most extreme environments in the Universe,” Rory Smith from OzGrav-Monash University said.

    The presence or absence of a radio counterpart may help tip the balance one way or another.

    Catching the next wave

    The era of gravitational wave research is still young. As the sensitivity of LIGO improves, it will detect more mergers at even greater distances.

    “This is just the tip of the iceberg. ASKAP’s fast survey capability will enable us to probe the sky deeper and wider than ever before, playing a key role in understanding these mergers,” Tara said.

    We acknowledge the Wajarri Yamatji as the traditional owners of the Murchison Radio-astronomy Observatory site.

    See the full article here .


    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.

    Stem Education Coalition

    CSIRO campus

    CSIRO (AU)-Commonwealth Scientific and Industrial Research Organisation , is Australia’s national science agency and one of the largest and most diverse research agencies in the world.

    CSIRO works with leading organisations around the world. From its headquarters in Canberra, CSIRO maintains more than 50 sites across Australia and in France, Chile and the United States, employing about 5,500 people.

    Federally funded scientific research began in Australia 104 years ago. The Advisory Council of Science and Industry was established in 1916 but was hampered by insufficient available finance. In 1926 the research effort was reinvigorated by establishment of the Council for Scientific and Industrial Research (CSIR), which strengthened national science leadership and increased research funding. CSIR grew rapidly and achieved significant early successes. In 1949 further legislated changes included renaming the organisation as CSIRO.

    Notable developments by CSIRO have included the invention of atomic absorption spectroscopy; essential components of Wi-Fi technology; development of the first commercially successful polymer banknote; the invention of the insect repellent in Aerogard and the introduction of a series of biological controls into Australia, such as the introduction of myxomatosis and rabbit calicivirus for the control of rabbit populations.

    Research and focus areas

    Research Business Units

    As at 2019, CSIRO’s research areas are identified as “Impact science” and organised into the following Business Units:

    Agriculture and Food
    Health and Biosecurity
    Data 61
    Energy
    Land and Water
    Manufacturing
    Mineral Resources
    Oceans and Atmosphere

    National Facilities

    CSIRO manages national research facilities and scientific infrastructure on behalf of the nation to assist with the delivery of research. The national facilities and specialized laboratories are available to both international and Australian users from industry and research. As at 2019, the following National Facilities are listed:

    Australian Animal Health Laboratory (AAHL)
    Australia Telescope National Facility – radio telescopes included in the Facility include the Australia Telescope Compact Array, the Parkes Observatory, Mopra Observatory and the Australian Square Kilometre Array Pathfinder.

    .

    CSIRO Pawsey Supercomputing Centre AU)

    Others not shown

    SKA

    SKA- Square Kilometer Array

    .

     
  • richardmitnick 12:17 pm on July 9, 2020 Permalink | Reply
    Tags: "ASKAP searches for afterglow of gravitational wave", , , , , , , LIGO-Virgo Finds Mystery Object in "Mass Gap"   

    From CSIROscope: “ASKAP searches for afterglow of gravitational wave” 

    CSIRO bloc

    From CSIROscope

    24 June 2020
    Annabelle Young

    1
    Scientists have made a new gravitational waves discovery. Image credit: C. Knox/ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav).

    Scientists are puzzled by a new gravitational waves discovery. Have they discovered the heaviest neutron star or the lightest black hole ever observed?

    More than a century ago, Albert Einstein predicted massive objects like neutron stars and black holes produce ripples in space as they orbit one another and eventually merge in a violent clash.

    Gravitational waves from a black hole merger were first detected in 2015. Two years later researchers found not only gravitational waves but gamma-rays, light and radio waves from the merger of a pair of neutron stars.

    The Laser Interferometer Gravitational-Wave Observatory (LIGO) discovered these gravitational waves or ‘ripples’ in space.


    Caltech/MIT Advanced aLigo Hanford, WA, USA installation


    Caltech/MIT Advanced aLigo detector installation Livingston, LA, USA

    Cornell SXS, the Simulating eXtreme Spacetimes (SXS) project


    Gravitational waves. Credit: MPI for Gravitational Physics/W.Benger-Zib

    ESA/eLISA the future of gravitational wave research

    It bagged three of its founders the 2017 Nobel prize in physics.

    LIGO’s system of lasers, mirrors and vacuum tubes make it the most precise ‘ruler’ on Earth. It’s capable of detecting these previously invisible ripples in space, which are smaller than the diameter of a proton.

    In August 2019, astronomers received an alert that LIGO had detected gravitational waves from a new type of event. The long-awaited merger of a suspected neutron star and a black hole!

    ASKAP [below] on patrol for a gravitational waves discovery

    Within minutes of receiving the alert, a team led by Professor Tara Murphy at The University of Sydney activated plans to use our ASKAP radio telescope. They were searching for the afterglow produced by the merger.

    Because gravitational waves are so hard to detect, LIGO can’t pinpoint where these mergers occur. So, they send the astronomy community a ‘sky map’ indicating a region where the event happened. Often these maps cover as much as a quarter of the sky. This takes hundreds of hours to search using a regular telescope.

    ASKAP is equipped with novel receivers that give it a wide-angle lens on the sky. In one pointing, ASKAP can view an area of sky about the size of the Southern Cross.

    Coincidentally, the sky map sent by LIGO for the detection of this merger was about the same size as ASKAP’s field of view. This allowed Tara’s team to observe almost the whole area of the map at once.

    Nine days after the merger, the ASKAP team found a source known as AT2019osy that had nearly doubled in brightness over the course of a week. The smoking gun of a radio afterglow?

    “We immediately alerted thousands of astronomers involved in the gravitational wave follow-up effort, and telescopes across the world, and in space, began slewing to observe our candidate,” team member Dougal Dobie, a co-supervised PhD student at The University of Sydney and CSIRO said.

    False start but the tide’s rising

    “Unfortunately, these observations suggested AT2019osy was produced by normal activity from the black hole at the centre of a galaxy and unrelated to the merger,” Dougal said.

    Continued ASKAP searches didn’t find any other candidates. This might seem disappointing but the ASKAP team say the effort was not wasted. A non-detection rules out several scenarios and helps place limits on the energy released during the merger.

    Hints of a deeper mystery

    Ongoing analysis of the LIGO data has shown the lack of a radio counterpart may even support the idea something unexpected is happening. The signal received by LIGO when a merger occurs depends on the mass of the two objects involved. Initial analysis suggested the merger of a neutron star and a black hole. But a recent announcement suggests this may not be the entire story.

    https://sciencesprings.wordpress.com/2020/06/23/from-northwestern-university-ligo-virgo-finds-mystery-astronomical-object-in-mass-gap/

    “We may have discovered either the heaviest neutron star or the lightest black hole ever observed. If it really is a heavy neutron star, this will radically alter our understanding of nuclear matter in the densest, most extreme environments in the Universe,” Rory Smith from OzGrav-Monash University said.

    The presence or absence of a radio counterpart may help tip the balance one way or another.

    Catching the next wave

    The era of gravitational wave research is still young. As the sensitivity of LIGO improves, it will detect more mergers at even greater distances.

    “This is just the tip of the iceberg. ASKAP’s fast survey capability will enable us to probe the sky deeper and wider than ever before, playing a key role in understanding these mergers,” Tara said.

    We acknowledge the Wajarri Yamatji as the traditional owners of the Murchison Radio-astronomy Observatory site.

    See the full article here .


    five-ways-keep-your-child-safe-school-shootings

    Please help promote STEM in your local schools.

    Stem Education Coalition

    Australian Square Kilometre Array Pathfinder (ASKAP) is a radio telescope array located at Murchison Radio-astronomy Observatory (MRO) in the Australian Mid West. ASKAP consists of 36 identical parabolic antennas, each 12 metres in diameter, working together as a single instrument with a total collecting area of approximately 4,000 square metres.

    So what can we expect these new radio projects to discover? We have no idea, but history tells us that they are almost certain to deliver some major surprises.

    Making these new discoveries may not be so simple. Gone are the days when astronomers could just notice something odd as they browse their tables and graphs.

    Nowadays, astronomers are more likely to be distilling their answers from carefully-posed queries to databases containing petabytes of data. Human brains are just not up to the job of making unexpected discoveries in these circumstances, and instead we will need to develop “learning machines” to help us discover the unexpected.

    With the right tools and careful insight, who knows what we might find.

    CSIRO campus

    CSIRO, the Commonwealth Scientific and Industrial Research Organisation, is Australia’s national science agency and one of the largest and most diverse research agencies in the world.

     
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