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
|
|
|
|
news links
|
|
Tuesday, April 22
US to allies: Don’t use Chinese satellite services
Defense One — 5:58 am ET (0958 GMT) Egypt Inaugurates African Space Agency Headquarters in Cairo
Egypt Today — 5:57 am ET (0957 GMT) Egypt inaugurates African Space Agency headquarters in Cairo
Yeni Safak — 5:57 am ET (0957 GMT) African Space Agency's Headquarters Inaugurated in Egypt
allAfrica.com — 5:56 am ET (0956 GMT) Egypt Launches African Space Agency HQ
MENAFN — 5:56 am ET (0956 GMT) |
