GN-z11
Salah satu galaksi tertua dan terjauh yang diketahui saat ini
GN-z11 adalah galaksi tinggi pergeseran merah ditemukan di konstelasi Ursa Major, dan saat ini merupakan galaksi yang tertua dan paling jauh yang dikenal di alam semesta yang dikenal. GN-Z11 memiliki pergeseran merah spektroskopi dari z = 11,1, yang sesuai dengan jarak comoving sekitar 32 miliar tahun cahaya dari Bumi. GN-Z11 diamati karena ada 13,4 miliar tahun yang lalu, hanya 400 juta tahun setelah Big Bang. jaraknya karena itu secara luas dilaporkan sebagai 13,4 miliar tahun cahaya.[1][n 1][2][3][4]
Notes
- ^ At first glance, the distance of 32 billion light years might seem impossibly far away in a Universe that is only 13.8 billion years old, where a light year is the distance light travels in a year, and where nothing can travel faster than the speed of light.
Referensi
- ^ "Astronomers Spot Most Distant Galaxy—At Least For Now". Phenomena. Diakses tanggal March 4, 2016.
Yep, it took 13.4 billion years for light from the galaxy to zoom through the universe and collide with the Hubble Space Telescope. But that doesn’t mean the galaxy is 13.4 billion light-years away. The universe has been expanding in the meantime, meaning GN-z11 is actually much, much farther from Earth than that.
“Right now, we expect this galaxy to be about 32 billion light-years away from us in distance,” says study coauthor Pascal Oesch of Yale University. - ^ Amos, Jonathan (March 3, 2016). "Hubble sets new cosmic distance record". BBC News. Diakses tanggal March 3, 2016.
- ^ Oesch, P. A.; Brammer, G.; van Dokkum, P.; et al. (March 1, 2016). "A Remarkably Luminous Galaxy at z=11.1 Measured with Hubble Space Telescope Grism Spectroscopy". arXiv:1603.00461
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- ^ "Astronomers Spot Record Distant Galaxy From Early Cosmos", The New York Times (by the Associated Press), March 3, 2106; "GN-z11: Astronomers push Hubble Space Telescope to limits to observe most remote galaxy ever seen", Australian Broadcasting Corporation, March 4, 2016.
