Dark GRBs linked to dust clouds
Posted: Tue, Jun 9, 2009, 8:22 AM ET (1222 GMT)
A class of gamma-ray bursts (GRBs) without a visible afterglow have been linked to galaxies with previously undetected dust clouds, astronomers announced Monday. "Dark" GRBs are so named because they have no detectable afterglow as visible or infrared wavelengths. Astronomers originally thought these GRBs were so distant that the light had been redshifted beyond detection. However, astronomers studied 14 such bursts and found that almost every one of them was associated with a galaxy that was visible in optical telescopes. Astronomers now believe the optical afterglow of these GRBs was absorbed by clouds of dust, perhaps associated with regions of star formation, not previously detected around these galaxies.
A class of gamma-ray bursts (GRBs) without a visible afterglow have been linked to galaxies with previously undetected dust clouds, astronomers announced Monday. "Dark" GRBs are so named because they have no detectable afterglow as visible or infrared wavelengths. Astronomers originally thought these GRBs were so distant that the light had been redshifted beyond detection. However, astronomers studied 14 such bursts and found that almost every one of them was associated with a galaxy that was visible in optical telescopes. Astronomers now believe the optical afterglow of these GRBs was absorbed by clouds of dust, perhaps associated with regions of star formation, not previously detected around these galaxies.
Related Links:
| <<previous article | next article>> |
|
news in brief
|
|
NASA to launch Nancy Grace Roman Space Telescope in September
Posted: Sat, Apr 25 10:54 AM ET (1454 GMT) |
|
news links
|
|
Thursday, April 30
United States Welcomes Morocco Signing of the Artemis Accords
US State Department — 6:58 am ET (1058 GMT) What would happen without satellite communications?
ESA — 6:56 am ET (1056 GMT) Baking a parachute for Mars
ESA — 6:55 am ET (1055 GMT) Space Command cuts ribbon on first Redstone facility
WAFF-TV — 6:54 am ET (1054 GMT) Space Command cuts ribbon on first AL facility, lays groundwork for 200 personnel by end of year
WHNT-TV — 6:53 am ET (1053 GMT) |
