Could supernova be a newborn black hole?

13 Janvier, 2019, 04:42 | Auteur: Therese Cote
  • This Exploding'Cow May Be the First Black Hole Birth Ever Observed

Back in June scientists spotted an unusually bright flare-up that they now think could have been a black hole or neutron star at the moment of its creation. The Cow was first spotted on June 16 after the ATLAS telescope captured an extremely bright anomaly 200 million light-years away in the Hercules constellation. "The Cow [as the burst was nicknamed] started to look very, very different from anything we had ever seen in the X-ray", explained Raffaela Margutti from the Northwestern University in IL, and the new study's leading author. However, seeing as massive stars are known to form either neutron stars or black holes when collapse, the team thinks that the object could be one or the other.

This object was either a black hole or a neutron star - both incredibly dense regions of space - and the stellar debris approaching the event horizon of the object was responsible for the flash. It was as much as 100 times brighter than a normal supernova, and flared up and disappeared much more quickly, flinging out particles so fast that it almost completely disappeared within just 16 days. It also flared and disappeared much faster than other known star explosions; within 16 days the object had emitted most of its power, and the object had very little ejecta swirling around.

"In a universe where some phenomena last for millions and billions of years, two weeks amounts to the blink of an eye", the statement said.

"We knew right away that this source went from inactive to peak luminosity within just a few days", Dr Margutti said. The dwarf galaxy that houses The Cow is around two hundred million light years away, which may seem like a lot, but is pretty close by astronomical standards.

The phenomena is similar to a supernova, when a dying star results in the formation of a black hole or neutron star.

The team also obtained optical images from the MMT Observatory in Arizona, as well as the Southern Astrophysical Research SOAR Telescope in Chile. Margutti's team was studying the mysterious explosion in space using x-ray wavelengths from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) and the European Space Agency's International Gamma-Ray Astrophysics Laboratory (INTEGRAL) and XMM Newton spacecraft. Because of the X-ray emissions, Margutti and her colleagues suggest the original star in this scenario may have been relatively low in mass, producing a comparatively thinner debris cloud through which X-rays from the central source could escape.

Boeing-Embraer merger going ahead after Bolsonaro approval
A second joint venture between the companies would promote and develop new markets for the multimission medium airlift KC-390. In December, a Brazilian court made a preliminary decision to suspend the creation of an alliance between Boeing and Embraer.

Des gilets jaunes perturbent une visite de Macron — Créteil
Il a notamment eu la chance de rencontrer les joueurs de l'équipe de France et de recevoir un ballon et un maillot des experts. Maintenant, c'est à vous de jouer.

Julián Castro Announces 2020 Presidential Run
Moderates and progressives in the party have been debating about how to best challenge Trump, the likely Republican nominee. Some Democrats believe an establishment figure who can appeal to centrist voters is the way to win back the White House.

This enabled the astronomers to continue studying the anomaly long after its initial visible brightness faded.

The team found that the "ejecta" swirling around "The Cow" was about 10 times less, compared to a typical stellar explosion. This allowed astronomers to see directly through to the object's central engine's radiation. Study coauthor Brian Grefenstette, an instrument scientist at Caltech, explained that "if we're seeing the birth of a compact object in real time, this could be the start of a new chapter in our understanding of stellar evolution".

"We thought it must be a supernova", Raffaella Margutti, researcher at Northwestern University, said in a news release.

Margutti's team at Northwestern includes graduate student Aprajita Hajela, postdoctoral fellows Giacomo Terreran, Deanne Coppejans and Kate Alexander (who is a Hubble Fellow), and first-year undergraduate student Daniel Brethauer.

The team also believes that the star's relative closeness to Earth helped them track the event in detail.

"Being given the opportunity to contribute to something as cutting edge and global as understanding AT2018cow as an undergrad is a surreal experience", Brethauer said.

Conseillé:

  • Retail turnover rises 0.4 per cent in November

    Retail turnover rises 0.4 per cent in November

    The reversal in non-food sales in 2017 was even more acute with November's 2.1% gain followed up by a 1.4% plunge in December. Compared to the same period in 2017, sales of food and beverage services increased 2.4 per cent in November previous year .
    Talks continue to break impasse over pipeline construction in northern BC

    Talks continue to break impasse over pipeline construction in northern BC

    Hereditary chiefs of the Wet'suwet'en First Nation have reached a deal with the RCMP to allow a natural gas company access across a bridge that had been blocked in their territory.
    Medieval woman’s art career revealed by blue stains on teeth

    Medieval woman’s art career revealed by blue stains on teeth

    During the German woman's lifetime, ultramarine was so rare that it would have been worth its weight, or more, in gold. Few illuminated manuscripts were signed by their creators, but those that have a signature were usually signed by men.
  • 3,2% de croissance au Maroc en 2018 — Banque Mondiale

    3,2% de croissance au Maroc en 2018 — Banque Mondiale

    Le Royaume dépasserait des pays comme la Jordanie et l'Algérie (2,3% chacune). Il devra être au même niveau de croissance que la Tunisie.
    Ring Let Employees Watch Customer Security Camera Feeds

    Ring Let Employees Watch Customer Security Camera Feeds

    The source also recounted instances of Ring engineers " teasing each other about who they brought home " after romantic dates. From there, employees could access the footage from anywhere, according to a separate report from the Information .
    Huge glitch as Powerball jackpot hits record $100m

    Huge glitch as Powerball jackpot hits record $100m

    Of these entries, nearly two-thirds were quick-pick entires, and nearly one-in-four of the winning entries were PowerHIT entries. Punters have been warned to avoid choosing numbers 1, 2, 4 or 18 because they haven't made an appearance in the last 18 months.
  • Pro-Kabila camp won DR Congo legislative poll: AFP tally

    Pro-Kabila camp won DR Congo legislative poll: AFP tally

    Under the constitution, the majority enjoys significant powers and the president must appoint his prime minister from its ranks. Fayulu, who has members of the Republican Guard deployed outside his home, called for a manual recount of the election.
    NFL Considering Moving AFC Title Game If Chargers Host It

    NFL Considering Moving AFC Title Game If Chargers Host It

    Galaxy, it is primarily used for soccer and is not properly created to accommodate NFL games. However, this solution also presents another dilemma.
    US approved thousands of child bride requests

    US approved thousands of child bride requests

    Separately, the data show some 4,749 minor spouses or fiancees received green cards to live in the USA over that 10-year period. The country where most requests came from was Mexico, followed by Pakistan, Jordan, the Dominican Republic and Yemen.
  • Juncker rules out giving May anything more than ‘clarifications’ over Brexit deal

    Juncker rules out giving May anything more than ‘clarifications’ over Brexit deal

    Brexit could be cancelled if MPs vote down the deal reached with Brussels, the foreign secretary has warned. You know, "how do we keep the United Kingdom in this awful institution?" This is a cunning plan.
    Santé: ce que contient le projet de loi Buzyn

    Santé: ce que contient le projet de loi Buzyn

    Une mesure qui fait suite au plan d'actions du gouvernement mis en place en mai dernier en réponse à la crise des ehpad . Mais le dossier détaillant cette "feuille de route" ne fait mention d'aucune prime ou revalorisation salariale.
    Blue Jays trade C Martin to Dodgers

    Blue Jays trade C Martin to Dodgers

    The four-time all-star has also played for the New York Yankees and Pittsburgh Pirates over his 13-year big-league career. Brito, 19, is a Dominican-born infielder who spent last season in rookie ball.


Populaire

How to Watch Cowboys vs. Rams
The two teams have had strong offensive line play at times this season as both the Rams and Cowboys have blocked for 1,200-plus yard rushers.

[EN VIDÉO] La Toyota Supra 2020 dévoilée avant le temps
Avec le retour de la Supra en GT500, on retrouvera le classique trio qui a fait les belles heures du JGTC: Supra, GT-R et NSX. Les lignes de la carrosserie fuient jusqu'à l'arrière, où l'appellation "Supra" trône sous le logo de Toyota .

Bank of Canada keeps interest rate unchanged
Global benchmark prices for oil have been about 25 per cent lower than assumed in the October Monetary Policy Report (MPR). The recent drop in crude prices will have a "material impact" on the Canadian outlook, the bank said.

Southampton out of relegation zone with win
Long's strike, in first-half injury time, came just 120 seconds after Yan Valery was sent off for a second bookable offence.

Julien Nkoghe Bekale ou la surprise du chef de l'Etat — Gabon
Il a en effet été ministres des Mines, du Pétrole et des Hydrocarbures en 2009, des Transports et de l'Equipement en 2011. Il a également fréquenté l'Assemblée nationale, en qualité de député du premier siège du département du Komo Mondah.

Macy's stock has worst day ever on holiday sales warning
Department store retailers are getting hammered this morning on Wall Street after posting lackluster holiday sales numbers. With low unemployment, rising wages and consumer confidence high, there had been optimism about holiday sales receipts.

Amazon voudrait lancer en 2020 son propre service de jeux en streaming
Le mastodonte pourrait bien être une menace pour la concurrence car il affiche une belle expertise dans le milieu du cloud. Le cloud-gaming, c'est exactement la même chose, sauf qu'il faut une connexion internet bien plus puissante que Netflix.

McLaren hire new boss as reshuffle goes on
Key will report to Seidl and head up the technical department comprising Peter Prodromou, Andrea Stella and Pat Fry. In addition, De Ferran has run his own team in endurance racing in the United States in the past.

Police Officer Natalie Corona of Arbuckle gunned down
There, he met with a roommate, "and really didn't show any signs that he had just been involved in this incident", Pytel said. Firefighters at a nearby station provided immediate medical help before Corona was rushed to the UC Davis Medical Center.

Fulham vice chairman Tony Khan tells fan to 'go to hell'
Khan expanded further in response to an Associated Press tweet posting an article on the exchange. Fulham remained second to last.