Featured Research

from universities, journals, and other organizations

Chandra Survey Of Distant Galaxies Provides Evidence For Vigorous Starbursts

Date:
May 18, 2000
Source:
NASA's Marshall Space Flight Center
Summary:
Using NASA's Chandra X-ray Observatory, astronomers have made the first long-duration X-ray survey of the Hubble Deep Field North. They detected X-rays from six of the galaxies in the field, and were surprised by the lack of X-rays from some of the most energetic galaxies in the field.

Using NASA's Chandra X-ray Observatory, astronomers have made the first long-duration X-ray survey of the Hubble Deep Field North. They detected X-rays from six of the galaxies in the field, and were surprised by the lack of X-rays from some of the most energetic galaxies in the field.

Related Articles


The X-ray emitting objects discovered by the research team are a distant galaxy thought to contain a central giant black hole, three elliptically shaped galaxies, an extremely red distant galaxy, and a nearby spiral galaxy.

"We were expecting about five X-ray sources in this field," said Professor Niel Brandt of Pennsylvania State University, University Park, and one of the leaders of the research team that conducted the survey. "However, it was very surprising to find that none of the X-ray sources lined up with any of the submillimeter sources."

The submillimeter sources are extremely luminous, dusty galaxies that produce large amounts of infrared radiation. Because they are over ten billion light years from Earth, their infrared radiation is shifted to longer, submillimeter wavelengths as it traverses the expanding universe. The primary source of the large power of the submillimeter sources is thought to be an unusually high rate of star formation, or the infall, or accretion of matter into a giant black hole in the center of the galaxy. X-ray observations provide the most direct measure of black hole accretion power. X-rays, because of their high energy, would be expected to pass through the gas and dust in these galaxies, unlike visible light.

"With Chandra we have been able to place the best X-ray constraints ever on submillimeter sources," said Ann Hornschemeier, also of Penn State, and the lead author of an upcoming Astrophysical Journal paper describing the discovery. "Our results indicate that less than 15 percent of the submillimeter sources can be luminous X-ray sources."

"That means," Brandt explains, "Either there is an enormous amount of star formation in those galaxies, or these objects contain the best-hidden black holes in the universe."

Chandra's increased spatial resolution -- the capability to concentrate X-rays into a smaller area -- also increases its sensitivity for detecting fainter X-ray sources than ever before. "Many of our sources are fainter than any source that was detected in the deepest observations by all previous X-ray observatories," Hornschemeier says. The research team used Chandra's Advanced CCD Imaging Spectrometer (ACIS) to make the unusually deep observation of the Hubble Deep Field in X-rays for about 46 hours in November 1999.

The authors of the research paper titled "X-Ray Sources in the Hubble Deep Field Detected by Chandra" are A. E. Hornschemeier, W. N. Brandt, G. P. Garmire, D. P. Schneider, P. S. Broos, L. K. Townsley, D. N. Burrows, E. D. Feigelson, and J. A. Nousek at Penn State; M. W. Bautz at the Massachusetts Institute of Technology,

Cambridge, Mass.; R. Griffiths at Carnegie Mellon University, Pittsburgh, Penn.; D. Lumb at the European Space Research and Technology Center in The Netherlands; and W. L. W. Sargent at the California Institute of Technology, Pasadena, Calif. The paper will be published in the September issue of the Astrophysical Journal.

The ACIS X-ray camera was conceived and developed for NASA by Penn State and the Massachusetts Institute of Technology under the leadership of Gordon Garmire, Professor of Astronomy and Astrophysics at Penn State.

NASA's Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program. TRW, Inc., Redondo Beach, Calif., is the prime contractor for the spacecraft. The Smithsonian's Chandra X-ray Center controls science and flight operations from Cambridge, Mass.

Images associated with this release are available on the World Wide Web at:

http://chandra.harvard.eduandhttp://chandra.nasa.gov andhttp://www.astro.psu.edu/users/niel/hdf/hdf-chandra.html

Science Contacts:

Niel Brandt, 814-865-3509, niel@astro.psu.edu

Ann E. Hornschemeier, 814-863-0182, annh@astro.psu.edu


Story Source:

The above story is based on materials provided by NASA's Marshall Space Flight Center. Note: Materials may be edited for content and length.


Cite This Page:

NASA's Marshall Space Flight Center. "Chandra Survey Of Distant Galaxies Provides Evidence For Vigorous Starbursts." ScienceDaily. ScienceDaily, 18 May 2000. <www.sciencedaily.com/releases/2000/05/000517153852.htm>.
NASA's Marshall Space Flight Center. (2000, May 18). Chandra Survey Of Distant Galaxies Provides Evidence For Vigorous Starbursts. ScienceDaily. Retrieved April 21, 2015 from www.sciencedaily.com/releases/2000/05/000517153852.htm
NASA's Marshall Space Flight Center. "Chandra Survey Of Distant Galaxies Provides Evidence For Vigorous Starbursts." ScienceDaily. www.sciencedaily.com/releases/2000/05/000517153852.htm (accessed April 21, 2015).

Share This


More From ScienceDaily



More Space & Time News

Tuesday, April 21, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Hubble Marks 25th Birthday as Successor Readies for Launch

Hubble Marks 25th Birthday as Successor Readies for Launch

AFP (Apr. 20, 2015) — With the Hubble Space Telescope celebrating its 25th anniversary on April 24, 2015, AFPTV takes a look at Hubble&apos;s control room and gets a sneak peek inside the space center assembling the James Webb Telescope - Hubble&apos;s successor. Duration: 02:52 Video provided by AFP
Powered by NewsLook.com
Rocket Science: Building And Testing The Space Launch System

Rocket Science: Building And Testing The Space Launch System

Newsy (Apr. 19, 2015) — NASA&apos;s new rocket system will eventually be the most powerful ever built by man, but there are a lot of moving parts to test first. Video provided by Newsy
Powered by NewsLook.com
2015 NASA Rover Challenge Underway in Alabama

2015 NASA Rover Challenge Underway in Alabama

Reuters - Light News Video Online (Apr. 19, 2015) — Teams face an uphill battle for fastest rover in this year&apos;s NASA Human Exploration Rover Challenge in Alabama. Julie Noce reports. Video provided by Reuters
Powered by NewsLook.com
International Space Station Captures SpaceX Dragon Spacecraft

International Space Station Captures SpaceX Dragon Spacecraft

Reuters - News Video Online (Apr. 17, 2015) — SpaceX&apos;s Dragon spacecraft reaches the International Space Station and is successfully captured by the station&apos;s robotic arm. Rough Cut (no reporter narration). Video provided by Reuters
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:

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