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  • September 21, 2013
  • 10:12 AM
  • 670 views

Evolutionary phases of two groups of galaxies in the Leo cloud

by Usman Paracha in SayPeople

Main Point:

Researchers have reported that if we consider virial phases of population of galaxies, USGC U268 is in a pre-virial collapse phase while USGC U376 is in more evolved phase.

Published in:

arXiv accepted for publication in Advances in Space Research

Study Further:

Virialization:

In astronomy, Virialization refers to the loss of any substructure and the final form of dynamic equilibrium in a galaxy or cluster. In the virialized state, the merging process and the collap........ Read more »

A. Marino, L. Bianchi, P. Mazzei, R. Rampazzo, & G. Galletta. (2013) Galaxy evolution in groups. USGC U268 and USGC U376 in the Leo cloud. Advances in Space Research. arXiv: 1309.5031v1

  • September 19, 2013
  • 12:19 PM
  • 631 views

Finding of outburst one year prior to the SN 2011ht explosion

by Usman Paracha in SayPeople

Main Point:

Scientists have reported an outburst about one year prior to the reported explosion of the purported Type IIn supernova (SN) 2011ht.

Published in:

arXiv

Study Further:

Scientists used the Pan-STARRS data and reported that the outburst, source PSO J152.0441 51.8492, that has been seen so early could represent a progenitor star.

Researchers wrote, “This is only the fourth detection of an outburst prior to a claimed SN, and lends credence to the possibility that ........ Read more »

M. Fraser, M. Magee, R. Kotak, S. J. Smartt, K. W. Smith, J. Polshaw, A. J. Drake, T. Boles, C. -H. Lee, W. S. Burgett.... (2013) Detection of an outburst one year prior to the explosion of SN 2011ht. arXiv. arXiv: 1309.4695v1

  • September 17, 2013
  • 06:38 AM
  • 1,566 views

Scientists discover cosmic factory for making building blocks of life

by Perikis Livas in Chilon

Scientists have discovered a ‘cosmic factory’ for producing the building blocks of life, amino acids, according to research.
( further readind and links at TK's page )... Read more »

  • September 17, 2013
  • 03:22 AM
  • 1,220 views

Years of formation of universe, early stars, galaxies and quasars

by Usman Paracha in SayPeople

Formation of Universe:

Universe is thought to be formed about 13.8 ± 0.2 billion years ago at the Hubble constant H0 = 67.3 ± 1.2 km/s/Mpc, and a high value of the matter density parameter, Ωm = 0.315±0.017.

Formation of metals:

Scientists are of the opinion that only elements up to 4He and traces of Li, Be, B were formed in the early universe during Big Bang Nucleosynthesis (BBN), while heavier elements were formed by stellar nucleosynthesis and dispersed in ........ Read more »

A. D. Dolgov, & S. I. Blinnikov. (2013) Stars and Black Holes from the very Early Universe. arXiv. arXiv: 1309.3395v1

  • September 13, 2013
  • 10:13 AM
  • 632 views

Discovery of nine compact galaxies present in the intermediate redshift

by Usman Paracha in SayPeople

Main Point:

Researchers have discovered nine galaxies having the dynamical masses of greater than or equal to ten billion solar masses in the Sloan Digital Sky Survey (SDSS) spectrophotometric database.

Published in:

arXiv accepted for publication in The Astrophysical Journal Letters

Study Further:

Solar Mass:

Solar mass refers to the mass of the Sun that is considered as the standard to measure the masses of the large astronomical objects in space. Mass of the Sun is about 1.9........ Read more »

Ivana Damjanov, Igor Chilingarian, Ho Seong Hwang, & Margaret J. Geller. (2013) Discovery of Nine Intermediate Redshift Compact Quiescent Galaxies in the Sloan Digital Sky Survey. arXiv. arXiv: 1309.2948v1

  • September 9, 2013
  • 10:57 AM
  • 668 views

Newly presented model of the early universe

by Usman Paracha in SayPeople

Main Point:

Researchers have presented a model of the evolution of the early universe in which the dark matter plays an important role throughout the history of the universe.

Published in:

arXiv

Study Further:

Dark Matter:

In astronomy, dark matter is thought to comprise a substantial part of the mass of the universe but remains as yet undetected by direct observation. It is postulated to exist in the universe because of observed gravitational effects.

It is thought that dar........ Read more »

Paul H. Frampton, & Pham Q. Hung. (2013) Luminogenesis from Inflationary Dark Matter. arXiv. arXiv: 1309.1723v1

  • September 5, 2013
  • 04:49 AM
  • 1,015 views

Quantum steps towards the Big Bang

by Perikis Livas in Chilon

Present-day physics cannot describe what happened in the Big Bang. Quantum theory and the theory of relativity fail in this almost infinitely dense and hot primal state of the universe. Only an all-encompassing theory of quantum gravity which unifies these two fundamental pillars of physics could provide an insight into how the universe began. Scientists from the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) in Golm/Potsdam and the Perimeter Institute in Canada have ........ Read more »

MAX-PLANCK-GESELLSCHAFT. (2013) Quantum steps towards the Big Bang. MAX-PLANCK-GESELLSCHAFT. DOI: 10.1103/PhysRevLett.111.031301  

  • September 4, 2013
  • 03:58 PM
  • 986 views

Ultracold Big Bang experiment successfully simulates evolution of early universe

by Perikis Livas in Chilon

Physicists have reproduced a pattern resembling the cosmic microwave background radiation in a laboratory simulation of the Big Bang, using ultracold cesium atoms in a vacuum chamber at the University of Chicago.... Read more »

  • September 3, 2013
  • 09:34 AM
  • 1,055 views

Theoretical physics: The origins of space and time

by Perikis Livas in Chilon

Many researchers believe that physics will not be complete until it can explain not just the behaviour of space and time, but where these entities come from.... Read more »

  • September 3, 2013
  • 06:08 AM
  • 677 views

Huge amount of molecular outflow from Abell 1835 and related research suggestions

by Usman Paracha in SayPeople

Main Point:

Scientists have reported molecular gas outflow of about ten billion solar mass by the Abell 1835 brightest cluster galaxy (BCG).

Published in:

arXiv, submitted to ApJ

Study Further:

Brightest cluster galaxies (BCGs):

In astronomy, BCGs are among the largest and most shining galaxies in the universe. Many of them have the ability to form stars at higher rates that could reach up to hundreds of solar masses per year.

Abell 1835:

Abell 1835 is one of the BCGs wit........ Read more »

  • August 31, 2013
  • 05:06 PM
  • 1,164 views

Milky Way Gas Cloud Causes Multiple Images of Distant Quasar

by Perikis Livas in Chilon

For the first time, astronomers have seen the image of a distant quasar split into multiple images by the effects of a cloud of ionized gas in our own Milky Way Galaxy. Such events were predicted as early as 1970, but the first evidence for one now has come from the National Science Foundation’s Very Long Baseline Array (VLBA) radio telescope system.... Read more »

A. B. Pushkarev, Y. Y. Kovalev, M. L. Lister, T. Hovatta, T. Savolainen, M. F. Aller, H. D. Aller, E. Ros, J. A. Zensus, J. L. Richards.... (2013) VLBA observations of a rare multiple quasar imaging event caused by refraction in the interstellar medium. Astronomy . arXiv: 1305.6005v1

  • August 30, 2013
  • 03:11 AM
  • 657 views

Newly discovered ultra-bright submillimeter galaxy

by Usman Paracha in SayPeople

Main Point:

Scientists have reported the discovery of a new ultra-bright submillimeter galaxy (SMG) behind a nearby dwarf galaxy, i.e. Small Magellanic Cloud (SMC).

Published in:

The Astrophysical Journal Letters

Study Further:

Small Magellanic Cloud (SMC):

SMC is a dwarf galaxy and is one of the nearest neighbors of our Milky Way. It is also one of the most distant objects that can be seen with the naked eye from the earth.

It has a diameter of about 7,000 light years and i........ Read more »

Tatsuya Takekoshi, Yoichi Tamura, Tetsuhiro Minamidani, Kotaro Kohno, Taira Oogi, Kazuo Sorai, Asao Habe, Hajime Ezawa, Tai Oshima, Kimberly S. Scott, Jason E. Austermann, Shinya Komugi, Tomoka Tosaki, Norikazu Mizuno, Erik Muller, Akiko Kawamura, Toshika. (2013) Detection of an ultra-bright submillimeter galaxy behind the Small Magellanic Cloud. The Astrophysical Journal Letters. DOI: 10.1088/2041-8205/774/2/L30  

  • August 29, 2013
  • 09:59 AM
  • 1,061 views

Newly presented dates of the eras of universe

by Usman Paracha in SayPeople

Main Points:

According to the newly presented dates of the major eras of the universe, the era of radiation ended about 50,150 years after inflation and the era of matter ended 10.31 billion years after inflation.

Published in:

arXiv

Study Further:

Phase of the known Universe’s evolution:

In the studies of astronomoy, following are considered as the phases in the evolution of the known universe:

1. Radiation-dominated era

Radiation-dominated era is considered as the........ Read more »

  • August 28, 2013
  • 03:38 AM
  • 818 views

Cosmic rays and some research suggestions

by Usman Paracha in SayPeople

Main Point:

Cosmic rays are among the only intergalactic matter available for direct observation. They have a high energy range and could hold information for some new form of physics.

Published in:

Nuclear Physics B Proceedings Supplement

Study Further:

Pulsar:

It is referred to as a small dense star that releases brief, intense bursts of visible radiation, radio waves, and X-rays, and is thought to be a rapidly rotating neutron star.

Quasar:

It refers to a compact objec........ Read more »

Igor V. Moskalenko. (2013) Cosmic Rays in the Milky Way and Beyond. Nuclear Physics B Proceedings Supplement. arXiv: 1308.5482v1

  • August 27, 2013
  • 09:26 AM
  • 637 views

Radius discrepancy is present in low mass stars

by Usman Paracha in SayPeople

Main Point:

Scientists have reported that radius discrepancy equally affects both forms of low mass stars, i.e. single and binaries.

Published in:

This research has been accepted for publication in the Astrophysical Journal.

Study Further:

Low mass stars:

Stars having the mass equivalent to our Sun or lower than that are referred to as the low mass stars. Mass of the sun (M⊙) is about 1.9891 × 10^30 kg. Moreover, stars with M ≤ 0.6 M⊙ are considered as the stars, w........ Read more »

F. Spada, P. Demarque, Y. -C. Kim, & A. Sills. (2013) The radius discrepancy in low mass stars: single vs. binaries. The Astrophysical Journal. arXiv: 1308.5558v1

  • August 27, 2013
  • 04:54 AM
  • 698 views

Discovery of many planetary nebulae in a nearby galaxy

by Usman Paracha in SayPeople

Main Point:

Scientists have reported some new planetary nebulae in the Large Magellanic Cloud (IV), i.e. outer LMC.

Published in:

arXiv

Study Further:

Nebula:

It is a region or cloud of interstellar dust and gas appearing variously as a hazy bright or dark patch. It is also called as nebulosity.

Large Magellanic Cloud (LMC):

LMC is a large nearby irregular galaxy. It is the third closest galaxy to the Milky Way. It has a mass of about 10 billion times the mass of the Sun,........ Read more »

  • August 26, 2013
  • 11:08 AM
  • 1,192 views

Why sunspots won’t help you make a fortune on wheat futures

by Thomas Sumner in GeoSpace

Astronomer William Herschel believed sunspots significantly affect the price of wheat. Now a USGS geophysicist says he's debunked Herschel's claim.... Read more »

  • August 26, 2013
  • 09:25 AM
  • 636 views

Newly found source of TeV gamma-rays

by Usman Paracha in SayPeople

Main Point:

Scientists have reported a newly discovered source of TeV gamma-ray i.e., VER J0521 211 that is also found to be a new blazar.

Published in:

arXiv

Study Further:

TeV astronomy:

This subject is related to the study of the astrophysical gamma rays having more than 0.1 TeV of energies. 1 TeV is 1 teraelectron volt = 1.60217657 × 10-7 joules.

VERITAS:

VERITAS (Very Energetic Radiation Imaging Telescope Array System) is a ground-based gamma-ray instrument ope........ Read more »

VERITAS Collaboration, S. Archambault, T. Arlen, T. Aune, M. Beilicke, W. Benbow, R. Bird, A. Bouvier, J. H. Buckley, V. Bugaev.... (2013) Discovery of a new TeV gamma-ray source: VER J0521 211. arXiv. arXiv: 1308.5017v1

  • August 22, 2013
  • 08:26 PM
  • 795 views

Interesting mission of Gaia

by Usman Paracha in SayPeople

Gaia is a global space astrometry mission by European Space Agency (ESA). The root for the mission went to ESA’s Hipparcos mission (1989-1993) that gave the information of more than 100,000 stars to high precision.

Now, the mission is almost ready to be launched in November.

Structure:

Gaia has two optical telescopes working with three science instruments to study the location and velocities of stars and to split their light into a spectrum for detailed analysis.

Position:

G........ Read more »

A. Krone-Martins, C. Ducourant, R. Teixeira, L. Galluccio, P. Gavras, S. dos Anjos, R. E. de Souza, R. E. G. Machado, & J. -F. Le Campion. (2013) Pushing the limits of the Gaia space mission by analyzing galaxy morphology. Astronomy . arXiv: 1307.5732v1

  • August 22, 2013
  • 12:47 PM
  • 1,325 views

All digital images are just large arrays of numbers

by Olga Vovk in Milchstraße

If we look at image processing from the mathematical perspective, all digital images are just arrays of numbers. Across different fields of study, image processing applications (although initially developed for very specific needs) often use similar image processing routines based on common algorithms. Why I am writing all this?... Read more »

Jennifer L. West, & Ian D. Cameron. (2006) Using the medical image processing package, ImageJ, for astronomy. J.Roy.Astron.Soc.Canada100:242-248,2006. arXiv: astro-ph/0611686v1

Michelle Borkin (Initiative in Innovative Computing, Harvard University), Alyssa Goodman (Initiative in Innovative Computing/Harvard-Smithsonian Center for Astrophysics), Michael Halle (Initiative in Innovative Computing/Harvard Medical School), Douglas A. (2006) Application of Medical Imaging Software to 3D Visualization of Astronomical Data. arXiv.org. info:/

Covington K, McCreedy ES, Chen M, Carass A, Aucoin N, & Landman BA. (2010) Interfaces and Integration of Medical Image Analysis Frameworks: Challenges and Opportunities. Annual ORNL Biomedical Science and Engineering Center Conference ORNL Biomedical Science and Engineering Center Conference, 1-4. PMID: 21151892  

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