Profile

Cover photo
Marisa Castro
Lives in FRANCE
3,047 followers|1,307,083 views
AboutPostsPhotosYouTube

Stream

Marisa Castro

Shared publicly  - 
 
 
Hubble Finds Nearest Quasar Powered by a Double Black Hole! Astronomers using NASA's Hubble Space Telescope have found that Markarian 231 (Mrk 231), the nearest galaxy to Earth that hosts a quasar, is powered by two central black holes furiously whirling about each other.

The finding suggests that quasars—the brilliant cores of active galaxies—may commonly host two central supermassive black holes that fall into orbit about one another as a result of the merger between two galaxies. Like a pair of whirling skaters, the black-hole duo generates tremendous amounts of energy that makes the core of the host galaxy outshine the glow of the galaxy's population of billions of stars, which scientists then identify as quasars.

Scientists looked at Hubble archival observations of ultraviolet radiation emitted from the center of Mrk 231 to discover what they describe as "extreme and surprising properties."

If only one black hole were present in the center of the quasar, the whole accretion disk made of surrounding hot gas would glow in ultraviolet rays. Instead, the ultraviolet glow of the dusty disk abruptly drops off towards the center. This provides observational evidence that the disk has a big donut hole encircling the central black hole. The best explanation for the observational data, based on dynamical models, is that the center of the disk is carved out by the action of two black holes orbiting each other. The second, smaller black hole orbits in the inner edge of the accretion disk, and has its own mini-disk with an ultraviolet glow.

"We are extremely excited about this finding because it not only shows the existence of a close binary black hole in Mrk 231, but also paves a new way to systematically search binary black holes via the nature of their ultraviolet light emission," said Youjun Lu of the National Astronomical Observatories of China, Chinese Academy of Sciences.

"The structure of our universe, such as those giant galaxies and clusters of galaxies, grows by merging smaller systems into larger ones, and binary black holes are natural consequences of these mergers of galaxies," added co-investigator Xinyu Dai of the University of Oklahoma.

The central black hole is estimated to be 150 million times the mass of our sun, and the companion weighs in at 4 million solar masses. The dynamic duo completes an orbit around each other every 1.2 years.

The lower-mass black hole is the remnant of a smaller galaxy that merged with Mrk 231. Evidence of a recent merger comes from the host galaxy's asymmetry, and the long tidal tails of young blue stars.

The result of the merger has been to make Mrk 231 an energetic starburst galaxy with a star-formation rate 100 times greater than that of our Milky Way galaxy. The infalling gas fuels the black hole "engine," triggering outflows and gas turbulence that incites a firestorm of star birth.

The binary black holes are predicted to spiral together and collide within a few hundred thousand years.

Mrk 231 is located 581 million light-years away.

The results were published in the August 14, 2015, edition of The Astrophysical Journal.

Image Description:
This artistic illustration is of a binary black hole found in the center of the nearest quasar host galaxy to Earth, Markarian 231. Like a pair of whirling skaters, the black-hole duo generates tremendous amounts of energy that makes the core of the host galaxy outshine the glow of the galaxy's population of billions of stars. Quasars have the most luminous cores of active galaxies and are often fueled by galaxy collisions.

Hubble observations of the ultraviolet light emitted from the nucleus of the galaxy were used to deduce the geometry of the disk, and astronomers were surprised to see light diminishing close to the central black hole. They deduced that a smaller companion black hole has cleared out a donut hole in the accretion disk, and the smaller black hole has its own mini-disk with an ultraviolet glow.

Credit: NASA, ESA, and G. Bacon (STScI)

+Hubble Space Telescope 
+European Space Agency, ESA 
+NASA Goddard 
+Space Telescope Science Institute 

#NASA #Hubble #Astronomy #Science #BlackHole #Binary #Galaxy #Quasar #Markarian231 #Mrk231 #Astrophysics #Cosmos #Universe #STScI #Artist #Illustration
37 comments on original post
10
Add a comment...

Marisa Castro

Shared publicly  - 
 
Marisa Castro 2015
https://flic.kr/p/xyDbsC
8
Add a comment...

Marisa Castro

Shared publicly  - 
 
Marisa Castro 2015
https://flic.kr/p/xDvX6f
10
Add a comment...

Marisa Castro

Shared publicly  - 
 
Je signale tous les mails #spam ! Gare à vous pirates !
 ·  Translate
SIGNALEZ LE SPAM EN UN CLIC, UN GESTE CITOYEN POUR : Renforcer la sécurité sur Internet; Participer à l'identification des spammeurs; Permettre le suivi et l'intervention des acteurs Internet. Vite, découvrez les bénéfices d'agir avec nous... Modifier la boîte · Annuler ...
2
Add a comment...

Marisa Castro

Shared publicly  - 
13
Simon K's profile photo
Simon K
+
1
2
1
 
Lovely detail 
Add a comment...

Marisa Castro

Shared publicly  - 
 
11
Add a comment...

Marisa Castro

Shared publicly  - 
 
Marisa Castro 2015
https://flic.kr/p/xyCFJq
11
Add a comment...

Marisa Castro

Shared publicly  - 
 
visite ouverte
 ·  Translate
4
Add a comment...

Marisa Castro

Shared publicly  - 
 
7
1
Ashley Graetz's profile photo
 
beautiful.. love the designs and flow
Add a comment...

Marisa Castro

Shared publicly  - 
 
Nous avons un point commun !
 ·  Translate
 
Spain & Portugal | International Space Station
Scott: "¡Hola, España & Ambassador James Costos from space station! From here, views of Spain never fall plain."

Credit: NASA/JSC, U.S. Astronaut Scott Kelly
Release Date: August 21, 2015

+Scott Kelly 
+NASA Johnson Space Center 

#NASA #Space #ISS #Earth #Spain #Espana #Portugal
#Portuguesa #Spacecraft #Technology #Engineering #Astronaut #ScottKelly #Photography #Art #Science #USA #UnitedStates #Expedition44 #YearInSpace #JourneytoMars #OrbitalPerspective #OverviewEffect #STEM #Education 
19 comments on original post
6
Add a comment...

Marisa Castro

Shared publicly  - 
12
1
Paul Paradis's profile photoAndy's profile photo
 
Superbe
 ·  Translate
Add a comment...

Marisa Castro

Shared publicly  - 
10
Add a comment...
People
In their circles
4,442 people
Have them in circles
3,047 people
Stasik Sherbakow's profile photo
alex okoroji's profile photo
김기원's profile photo
Andy's profile photo
Степан Сварожников's profile photo
Marcin Lewicki's profile photo
『夏川りみ』のこの1曲 ★ Google+お楽しみください。's profile photo
Excursion Organiser's profile photo
dlzar rap's profile photo
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
FRANCE
Story
Tagline
FRENCH Painter & Author of contemporary poetry.
Introduction
  Artiste peintre & Auteur de poésie contemporaine. Pintor de cuadros & Autor de poesía contemporánea. FRENCH Painter & Author of contemporary poetry.   Extrait de la préface du recueil de poèmes "Ecorce d'orage" signée Christian Le Roy (2009) : Le recueil de Marisa Castro porte le cri de désespérance de " l'amour fou ", le cri de colère de " l'amour sorcier "... C'est une oeuvre au noir, un travail vers le silence de l'autre... Marisa Castro s'écrie " d'un pays sous l'écorce " - Andalousie ou " chair rouge de Corse "... Dans un ciel tourmenté de nuées à la Goya, elle annonce " le reflet volcan ", des " orages nervurés de rubis "... En 2007, publication du recueil de poèmes intitulé 'les tiroirs parlent-ils ?'. Extrait de commentaire : "Est-ce qu'on peut entrer, toujours, n'importe où, être dans le dedans de cet endroit, même s'il n'est pas sûr qu'il y ait un dedans, tu entres..." (Guillevic). Qu'a-t-elle déposé ici ? ...Quelles tranches d'existence qui restaient en attente de tri... Et où avait-t-elle -seule -dissimulé "la clef de cette parade sauvage" (A. Rimbaud)... "Objets inanimés avez-vous donc une âme ?" (A. De Lamartine)...et la voici à la recherche de son temps perdu, car "chaque noeud du bois renferme davantage de cris d'oiseaux que tout le coeur de la forêt" (René Guy Cadou)...et bientôt elle perçoit un doux chuchotis de ..."la femme aux tiroirs" de Dalí, de Gala dans "l'union libre"... Gala de niveau de feu... Gala de niveau d'eau... Gala de niveau d'air... Gala de niveau de terre... Une belle voix toute bruissante de colliers et de cailloux bleus qui esquissent l'autoportrait intime d'une femme secrète. Fatalement. "Si je n'écris pas aujourd'hui, en saurai-je davantage ?" (Guillevic). Alors -vite- que l'écriture se prolonge à d'autres tiroirs... "Pour que les virgules inscrivent le merci" (Chantal Lammertyn). >Article signé par Ch. Le Roy. http://www.facebook.com/pages/Marisa-Castro/429617023746783#!/pages/Marisa-Castro/429617023746783  http://www.facebook.com/pages/Marisa-Castro/429617023746783#!/marisa.castro.9615  https://twitter.com/MarisaCastroOff  https://www.myspace.com/marisacastro
Links