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India's Deep Space Exploration Observatories (Orbital)

Discussion in 'Education & Research' started by Indx TechStyle, Dec 11, 2016.

  1. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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  2. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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    Announcement of Opportunity (AO) soliciting proposals for second AO cycle observations
    Announcement of Opportunity (AO) soliciting proposals for second AO cycle observations
     
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  3. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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    Astronomers discover ‘powerful cosmic double whammy’ with help of India’s GMRT
    A supermassive black hole and the collision of giant galaxy clusters have combined to create a cosmic acceleration.
    By: PTI | Washington |
    Updated: January 7, 2017 5:06 PM
    [​IMG]The two clusters are both very massive, each weighing about a quadrillion – or a million billion – times the mass of the Sun.
     
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  4. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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    Discovery of a hot companion associated with a Blue Straggler in NGC-188 using AstroSat UVIT data
    For details:
    [​IMG]FUV (left) and NUV (right) images of NGC-188 obtained on 18 February 2016.
    WOCS-5885 is marked as red square


    [​IMG]Spectral Energy Distribution (SED) for WOCS-5885. Points in light green are from UVIT

    Story of the Week - Archive
    Jan 09, 2017 : Discovery of a hot companion associated with a Blue Straggler in NGC-188 using AstroSat UVIT data
    Jan 02, 2017 : Golden Jubilee of Composite Materials Activities at ISRO
    Dec 26, 2016 : Indigenous Development of 4.5 ton Vertical Planetary Mixer
    Dec 19, 2016 : First National Finite Element Developers/FEASTSMT Users’ Meet at VSSC
    Dec 05, 2016 : National Rollout of GeoMGNREGA held at Vigyan Bhavan, New Delhi
    Nov 28, 2016 : Applications of Unmanned Aerial Vehicle (UAV) based Remote Sensing in NE Region
    Nov 21, 2016 : ISRO Telemetry, Tracking and Command Network (ISTRAC) Celebrates Ruby Year
     
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  5. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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  6. Tejasmk3

    Tejasmk3 2nd Lieutant FULL MEMBER

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    ‘Vampire’ star caught in the act by Indian space observatory ASTROSAT

    India's first dedicated space observatory, ASTROSAT, has captured the rare phenomenon of a small, 6-billion-year-old "vampire" star "preying" on a bigger celestial body.
    By: PTI | New Delhi | Published: January 29, 2017 1:00 PM

    [​IMG]
    “The small star becomes bigger, hotter and bluer, which gives it the appearance of being young, while the ageing companion burns out and collapses to a stellar remnant,” said Annapurni Subramaniam, a Professor at the Indian Institute of Astrophysics. (Representative image: Reuters)

    India’s first dedicated space observatory, ASTROSAT, has captured the rare phenomenon of a small, 6-billion-year-old “vampire” star “preying” on a bigger celestial body. Scientists say the smaller star, also called a “blue straggler”, feeds off its companion star by sucking out its mass and energy, causing its eventual death.

    “The most popular explanation is that these are binary systems in which the smaller star sucks material out of the bigger companion star to become a blue straggler, and hence is called a vampire star.

    “The small star becomes bigger, hotter and bluer, which gives it the appearance of being young, while the ageing companion burns out and collapses to a stellar remnant,” said Annapurni Subramaniam, a Professor at the Indian Institute of Astrophysics.

    Though this phenomenon is not unheard of, the observation of the entire process through the telescope will provide insights that will help scientists in studying the formation of ‘blue straggler’ stars.

    This discovery also highlights the capabilities of the telescopes on ASTROSAT, a dedicated space observatory satellite launched in September 2015.

    The study was recently published in Astrophysical Journal Letters by a team of scientists from IIA, Inter-University Centre of Astronomy and Astrophysics (IUCAA), Tata Institute of Fundamental Research (TIFR), Indian Space Research Organisation (ISRO) and the Canadian Space Agency (CSA).

    Scientists are now looking to understand the chemical composition of the ‘blue straggler’ using high resolution spectroscopy, which could reveal more about the evolution of these peculiar celestial objects.

    The stars are part of a “cluster” called NGC 188 formed some 6 billion years ago, and are much older than the sun, which is believed to have come into existence nearly 4.5 billion years ago.

    “As the sucked up material from the ageing star will be polluted with material processed within the ageing star, this blue straggler will throw light on the kind of nuclear processing that happens in ageing stars”, Subramaniam, also the Calibration Scientist of UVIT on board the ASTROSAT, said.
     
  7. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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    X-ray Polarimeter Satellite (XPoSat) Mission

    Source: Annual Report 2016-17
     
  8. Indx TechStyle

    Indx TechStyle Lieutenant FULL MEMBER

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    India's AstroSat catches astronomical imposter
    India’s AstroSat catches astronomical imposter Download PDF

    Indian scientists leading an international team of astronomers showed that a new object discovered in the sky, believed to be related to the latest gravitational wave discovery, was in fact an unrelated gamma ray burst.

    The LIGO scientific collaboration’s discovery of GW170104 led to a frenzy of activity among partner astronomers around the world, each trying to find any associated explosions in the sky. The Hawaii-based ATLAS group found a source that was in the right place in the sky, and was fading fast – causing excitement all around. But was it really associated with GW170104? Was it the first discovery of an optical source related to a gravitational wave detection? No, according to a study by the AstroSat CZTI team and the international GROWTH collaboration.

    While studying observations of the source – named ATLAS17aeu – the team noticed something odd about how fast it was fading. “Analysing the data, I concluded that ATLAS17aeu must be related to some explosion on 5th January, not the 4th”, says Varun Bhalerao (IIT Bombay), the lead author in this study. The team had already used CZTI to look for X-rays coming from GW170104, and not seen any. CZTI (Cadmium Zinc Telluride Imager), a gamma ray telescope on ISRO’s maiden space observatory AstroSat, proved to be the most sensitive instrument in the world to find transient sources with sub-second durations. So if there was another burst in the sky, they were sure they would find it in CZTI data. Varun continues, “I shot off an email to my student Sujay, asking him to search for a burst in CZTI data in the calculated time window. And then I noticed an email from Vidushi (another student) in my inbox: she had found the burst I was looking for!”

    The culprit seemed to be a gamma ray burst GRB 170105A – that exploded in the same part of the sky 21 hours later. But to be sure of this, astronomers needed more data. Enter GROWTH: Global Relay of Observatories Watching Transients Happen. This multi-national team had already swung into action, observing ATLAS17aeu with optical, X-ray and radio telescopes. Team member Dipankar Bhattacharya (IUCAA) said, “The team studied the source with radio, optical and X-ray telescopes for a few days, till it faded away into oblivion. Based on its behaviour we concluded that this event signalled the birth of a new black hole when a massive star imploded in a galaxy several billion light years away.”

    This gamma ray burst was missed by several other international satellites which were pointing at other parts of the sky at that instant. It was detected only by the Cadmium Zinc Telluride Imager (CZTI) on AstroSat, and by the Chinese-European POLAR instrument. “This is the result of insightful instrument design, imaginative onboard software, and collaborative data analysis from a nationwide team”, says A.R. Rao (TIFR). But the team has its eyes on the prize: finding the first electromagnetic counterpart to a gravitational wave source. And the highly sensitive CZTI might not be enough. Rao adds, “We need wide angle detectors scattered over interplanetary space to discover X-rays from LIGO sources. The CZTI team has proposed a small sized instrument called MOTIVE to ISRO as a likely payload for a future interplanetary mission. Together, CZTI and MOTIVE can revolutionize the field!”

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    CZT-Imager is built by a consortium of Institutes across India. The Tata Institute of Fundamental Research, Mumbai, led the effort with instrument design and development. Vikram Sarabhai Space Centre, Thiruvananthapuram provided the electronic design, assembly and testing. ISRO Satellite Centre (ISAC), Bengaluru provided the mechanical design, quality consultation and project management. The Inter University Centre for Astronomy and Astrophysics (IUCAA), Pune did the Coded Mask design, instrument calibration, and Payload Operation Centre. Space Application Centre (SAC) at Ahmedabad provided the analysis software. Physical Research Laboratory (PRL) Ahmedabad, provided the polarisation detection algorithm and ground calibration. A vast number of industries participated in the fabrication and the University sector pitched in by participating in the test and evaluation of the payload. The Indian Space Research Organisation funded, managed and facilitated the project.

    This work was supported by the GROWTH project funded by the National Science Foundation under Grant No 1545949. GROWTH is a collaborative project between California Institute of Technology (USA), Pomona College (USA), San Diego State University (USA), Los Alamos National Laboratory (USA), University of Maryland College Park (USA), University of Wisconsin Milwaukee (USA), Tokyo Institute of Technology (Japan), National Central University (Taiwan), Indian Institute of Astrophysics (India), Inter-University Center for Astronomy and Astrophysics (India), Weizmann Institute of Science (Israel), The Oskar Klein Centre at Stockholm University (Sweden), Humboldt University (Germany). GROWTH is supported by the Science and Engineering Research Board, Department of Science and Technology, India.

    More information about the discovery of the gravitational wave source GW170104 can be obtained at https://www.ligo.caltech.edu/page/press-release-gw170104, and in the IndIGO press release.
     

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