| 词条 | A1689-zD1 |
| 释义 |
| name = A1689-zD1 | image = A1689-zD1.jpg | caption = | credit = | epoch = | pronounce = | constellation name = Virgo | ra = {{RA|13|11|29.9}} | dec = {{DEC|-01|19|19}} | z = 7.6 | h_radial_v = | gal_v = | dist_ly = 13 billion light-years (light travel distance) | group_cluster = Abell 1689 | type = Dwarf spiral? | mass = {{Val|1.7|e=9}} | stars = | appmag_v = 25.3 | size = ~10,000 ly (diameter) | size_v = | notes = | names = BBF2008 A1689-zD1 | references = }}A1689-zD1 is a galaxy in the Virgo constellation cluster. It was a candidate for the most distant and therefore earliest observed galaxy discovered {{as of|2008|February|lc=y}}, based on a photometric redshift.[1][2] If the redshift, z~7.6,[3] is correct, it would explain why the galaxy's faint light reaches us at infrared wavelengths. It could only be observed with Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) and the Spitzer Space Telescope's Infrared Array Camera exploiting the natural phenomenon of gravitational lensing: the galaxy cluster Abell 1689, which lies between Earth and A1689-zD1, at a distance of 2.2 billion light-years from us, functions as a natural "magnifying glass" for the light from the far more distant galaxy which lies directly behind it, at 700 million years after the Big Bang, as seen from Earth.[1] See also
References1. ^1 {{cite web | title = Astronomers Eye Ultra-Young, Bright Galaxy in Early Universe | publisher = nasa.gov | date = 2008-02-12 | url = http://www.nasa.gov/centers/jpl/news/Spitzer20080212.html | accessdate = 2008-02-25 }} {{Galaxy}}{{Commons category|A1689-zD1}}2. ^{{cite web | title = Astronomers Uncover One of the Youngest and Brightest Galaxies in the Early Universe | publisher = Space Telescope Science Institute Baltimore, Md. / nasa.gov | date = 2008-02-12 | url = http://www.nasa.gov/mission_pages/hubble/science/young_bright.html | accessdate = 2008-02-25 | archiveurl= https://web.archive.org/web/20080217204728/http://www.nasa.gov/mission_pages/hubble/science/young_bright.html| archivedate= 17 February 2008 | deadurl= no}} 3. ^{{cite web|title= heic0805: Hubble finds strong contender for galaxy distance record|publisher= ESA/Hubble|date= 2008-02-12|url= http://www.spacetelescope.org/news/html/heic0805.html|accessdate= 2008-04-04| archiveurl= https://web.archive.org/web/20080308003313/http://www.spacetelescope.org/news/html/heic0805.html| archivedate= 8 March 2008 | deadurl= no}} 5 : Virgo (constellation)|Galaxies|Dwarf galaxies|Gravitational lensing|Astronomical objects discovered in 2008 |
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