Featured Research

from universities, journals, and other organizations

Astronomers measure most massive, most unusual black hole

Date:
November 28, 2012
Source:
University of Texas at Austin
Summary:
Astronomers have measured what may be the most massive black hole yet -- 17 billion suns -- in galaxy NGC 1277. The black hole makes up 14 percent of its galaxy's mass, rather than the usual 0.1 percent. This galaxy and others in the study could change theories of how black holes and galaxies form and evolve.

This diagram shows how the diamater of the 17-billion-solar-mass black hole in the heart of galaxy NGC 1277 compares with the orbit of Neptune around the Sun. The black hole is eleven times wider than Neptune's orbit. Shown here in two dimensions, the "edge" of the black hole is actually a sphere. This boundary is called the "event horizon," the point from beyond which, once crossed, neither matter nor light can return.
Credit: D. Benningfield/K. Gebhardt/StarDate

Astronomers have used the Hobby-Eberly Telescope at The University of Texas at Austin's McDonald Observatory to measure the mass of what may be the most massive black hole yet -- 17 billion Suns -- in galaxy NGC 1277. The unusual black hole makes up 14 percent of its galaxy's mass, rather than the usual 0.1 percent. This galaxy and several more in the same study could change theories of how black holes and galaxies form and evolve.

Related Articles


The work will appear in the journal Nature on Nov. 29.

NGC 1277 lies 220 million light-years away in the constellation Perseus. The galaxy is only ten percent the size and mass of our own Milky Way. Despite NGC 1277's diminutive size, the black hole its heart is more than 11 times as wide as Neptune's orbit around the Sun.

"This is a really oddball galaxy," said team member Karl Gebhardt of The University of Texas at Austin. "It's almost all black hole. This could be the first object in a new class of galaxy-black hole systems." Furthermore, the most massive black holes have been seen in giant blobby galaxies called "ellipticals," but this one is seen in a relatively small lens-shaped galaxy (in astronomical jargon, a "lenticular galaxy").

The find comes out of the Hobby-Eberly Telescope Massive Galaxy Survey (MGS). The study's endgame is to better understand how black holes and galaxies form and grow together, a process that isn't well understood.

"At the moment there are three completely different mechanisms that all claim to explain the link between black hole mass and host galaxies' properties. We do not understand yet which of these theories is best," said Nature lead author Remco van den Bosch, who began this work while holding the W.J. McDonald postdoctoral fellowship at The University of Texas at Austin. He is now at the Max Planck Institute for Astronomy in Heidelberg, Germany.

The problem is lack of data. Astronomers know the mass of fewer than 100 black holes in galaxies. But measuring black hole masses is difficult and time-consuming. So the team developed the HET Massive Galaxy Survey to winnow down the number of galaxies that would be interesting to follow up on.

"When trying to understand anything, you always look at the extremes: the most massive and the least massive," Gebhardt said. "We chose a very large sample of the most massive galaxies in the nearby universe," to learn more about the relationship between black holes and their host galaxies.

Though still ongoing, the team has studied 700 of their 800 galaxies with HET. "This study is only possible with HET," Gebhardt said. "The telescope works best when the galaxies are spread all across the sky. This is exactly what HET was designed for."

In the current paper, the team zeroes in on the top six most massive galaxies. They found that one of those, NGC 1277, had already been photographed by Hubble Space Telescope. This provided measurements of the galaxy's brightness at different distances from its center. When combined with HET data and various models run via supercomputer, the result was a mass for the black hole of 17 billion Suns (give or take 3 billion).

"The mass of this black hole is much higher than expected," Gebhardt said, "it leads us to think that very massive galaxies have a different physical process in how their black holes grow."


Story Source:

The above story is based on materials provided by University of Texas at Austin. Note: Materials may be edited for content and length.


Journal Reference:

  1. Remco C. E. van den Bosch, Karl Gebhardt, Kayhan Gόltekin, Glenn van de Ven, Arjen van der Wel, Jonelle L. Walsh. An over-massive black hole in the compact lenticular galaxy NGC 1277. Nature, 2012; 491 (7426): 729 DOI: 10.1038/nature11592

Cite This Page:

University of Texas at Austin. "Astronomers measure most massive, most unusual black hole." ScienceDaily. ScienceDaily, 28 November 2012. <www.sciencedaily.com/releases/2012/11/121128132305.htm>.
University of Texas at Austin. (2012, November 28). Astronomers measure most massive, most unusual black hole. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2012/11/121128132305.htm
University of Texas at Austin. "Astronomers measure most massive, most unusual black hole." ScienceDaily. www.sciencedaily.com/releases/2012/11/121128132305.htm (accessed October 24, 2014).

Share This



More Space & Time News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: China Launches Moon Orbiter

Raw: China Launches Moon Orbiter

AP (Oct. 24, 2014) — China launched an experimental spacecraft Friday to fly around the moon and back to Earth in preparation for the country's first unmanned return trip to the lunar surface. (Oct. 24) Video provided by AP
Powered by NewsLook.com
China Prepares Unmanned Mission To Lunar Orbit

China Prepares Unmanned Mission To Lunar Orbit

Newsy (Oct. 23, 2014) — The mission is China's next step toward automated sample-return missions and eventual manned missions to the moon. Video provided by Newsy
Powered by NewsLook.com
Russian Cosmonauts Kick Off Final Spacewalk of 2014

Russian Cosmonauts Kick Off Final Spacewalk of 2014

Reuters - US Online Video (Oct. 22, 2014) — Russian cosmonauts Maxim Suraev and Alexander Samokutyaev step outside the International Space Station to perform work on the exterior of the station's Russian module. Rough Cut (no reporter narration) Video provided by Reuters
Powered by NewsLook.com
Comet Siding Spring Grazes Mars' Atmosphere

Comet Siding Spring Grazes Mars' Atmosphere

Newsy (Oct. 19, 2014) — A comet from the farthest reaches of the solar system passed extremely close to Mars this weekend, giving astronomers a rare opportunity to study it. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

More Coverage


Giant Black Hole Could Upset Galaxy Evolution Models

Nov. 28, 2012 — Astronomers have discovered a black hole that could shake the foundations of current models of galaxy evolution. At 17 billion times the mass of the Sun, its mass is much greater than current models ... read more

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins