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X-43A launch preview
NASA officials preview the third and final test launch of the X-43A hypersonic vehicle during this news conference from Dryden Flight Research Center. (29min 47sec file)
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Deep Impact arrives
NASA's Deep Impact comet spacecraft arrives at the Astrotech Space Operations Facility near Kennedy Space Center to begin final launch preparations for blastoff December 30 aboard a Boeing Delta 2 rocket. (2min 53sec file)
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Veterans Day
Aboard the International Space Station, commander Leroy Chiao offers his thoughts in this downlinked message in honor of Veterans Day.
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Delta rocket lofts GPS
The Boeing Delta 2 rocket lifts off Saturday morning with the GPS 2R-13 satellite from pad 17B at Cape Canaveral, Florida.
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Launch in full
This longer-length clip follows the Delta 2 rocket during its late-night ascent carrying the latest Global Positioning System satellite. (2min 25sec file)
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Delta scrub
A red alarm triggers Friday morning's countdown to launch of Boeing's Delta 2 rocket carrying a GPS satellite to be scrubbed at Cape Canaveral, Florida. (1min 52sec file)
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Swift preview
Mission scientists preview NASA's Swift gamma-ray burst detection satellite being readied for launch into Earth orbit. (39min 49sec file)
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Voting from space
International Space Station Expedition 10 commander Leroy Chiao talks about the election and voting from orbit with CNN's Paula Zahn. (10min 20sec file)
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Delta 4-Heavy preview
Preview what a Boeing Delta 4 rocket launch will be like with this animation package of a "Heavy" configuration vehicle. (1min 41sec file)
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Cassini science update
Radar imagery of Saturn's moon Titan and other new data from the Cassini spacecraft is presented during this JPL news conference on Thursday. (54min 48sec file)
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Post-flyby briefing
Scientists and mission officials discuss the initial pictures and data obtained during Cassini's flyby of Titan during this JPL news conference on Wednesday. (55min 18sec file)
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First pictures
The first pictures taken by Cassini during this close encounter with Titan are received at the Jet Propulsion Laboratory to the delight of the mission's imaging leader. (2min 21sec file)
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Black hole found to precede galaxy bulge
Posted: November 14, 2004

Astronomers using the National Science Foundation's Very Large Array (VLA) radio telescope to study the most distant known quasar have found a tantalizing clue that may answer a longstanding cosmic chicken-and-egg question: which came first, supermassive black holes or giant galaxies?

For years, astronomers have noted a direct relationship between the mass of a galaxy's central, supermassive black hole and the total mass of the "bulge" of stars at its core. The more massive the black hole, the more massive the bulge. Scientists have speculated extensively about whether the black hole or the stellar bulge formed first. Recently, some theories have suggested that the two may form simultaneously.

However, the new VLA observations of a quasar and its host galaxy seen as they were when the Universe was less than a billion years old indicate that the young galaxy has a supermassive black hole but no massive bulge of stars.

"We found a large amount of gas in this young galaxy, and, when we add the mass of this gas to that of the black hole, they add up to nearly the total mass of the entire system. The dynamics of the galaxy imply that there isn't much mass left to make up the size of stellar bulge predicted by current models," said Chris Carilli, of the National Radio Astronomy Observatory (NRAO), in Socorro, NM.

The scientists studied a quasar dubbed J1148+5251, that, at more than 12.8 billion light-years, is the most distant quasar yet found. Discovered in 2003 by the Sloan Digital Sky Survey, J1148+5251 is a young galaxy with a bright quasar core seen as it was when the Universe was only 870 million years old. The Universe now is 13.7 billion years old.

Aiming the VLA at J1148+4241 for about 60 hours, the researchers were able to determine the amount of molecular gas in the system. In addition, they were able to measure the motions of that gas, and thus estimate the total mass of the galactic system. Earlier studies of the system had produced estimates that the black hole was 1 to 5 billion times the mass of our Sun.

The new VLA observations indicate that there are about 10 billion solar masses of molecular gas in the system, and that the system's total mass is 40-50 billion solar masses. The gas and black hole combined thus account for 11-15 billion solar masses out of that total.

"The accepted ratio indicates that a black hole of this mass should be surrounded by a stellar bulge of several trillion solar masses. Our dynamical measurement shows there's not much mass left over, excluding the black hole and the gas, to form a stellar bulge. This provides evidence that the black hole forms before the stellar bulge," said Fabian Walter, of the Max Planck Institute for Radioastronomy in Heidelberg, Germany, who was a Jansky Postdoctoral Fellow at NRAO in Socorro when the observations were made.

"One example certainly doesn't make the case, but in this object we we apparently have an example of a black hole without much of a stellar bulge. Now we need to make detailed studies of more such objects in the far-distant, early Universe," Carilli said. "With the vastly improved sensitivity of the Expanded VLA and the Atacama Large Millimeter Array (ALMA), which will come on line in a few years, we will have the tools we need to resolve this question definitively," Carilli added.

"Studies like this are the key to understanding how galaxies first formed," Walter said.

Walter and Carilli worked with Frank Bertoldi and Karl Menten of the Max Planck Institute in Bonn; Pierre Cox of the Institute of Space Astrophysics of the University of Paris-South; Fred K.Y. Lo of the NRAO in Charlottesville, VA; Xiahui Fan of the University of Arizona's Steward Observatory; and Michael Strauss of Princeton University, on the project. Their research results are being published in the Astrophysical Journal Letters.

The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc.