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Update on Largest Optical Telecope
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Sirius B Send message Joined: 26 Dec 00 Posts: 24876 Credit: 3,081,182 RAC: 7 |
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Johnney Guinness Send message Joined: 11 Sep 06 Posts: 3093 Credit: 2,652,287 RAC: 0 |
Great article! They have an image in the article and they "claim" that it was taken by the ALMA array, but its not. The image is an optical image of a galaxy, its not a radio telescope image. If the image is authentic, then maybe its got ALMA data superimposed on top of the optical image; On the ALMA website, it has the original images; http://www.almaobservatory.org/en/visuals/images/astronomy This is the data for the Antennae Galaxy; http://www.almaobservatory.org/en/visuals/images/astronomy/?g2_itemId=3431 ALMA did NOT take this image! Its a composite image. This is the radio data that ALMA took; John. |
Bob DeWoody Send message Joined: 9 May 10 Posts: 3387 Credit: 4,182,900 RAC: 10 |
So, is it an optical telescope or a radio telescope? Bob DeWoody My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events. |
Johnney Guinness Send message Joined: 11 Sep 06 Posts: 3093 Credit: 2,652,287 RAC: 0 |
So, is it an optical telescope or a radio telescope? Its a radio telescope Bob, The ALMA radio telescope is so powerful, if you compile the data properly, they can convert the radio data into an image. It produces what looks like a blobby image. In my last post, i posted 2 pictures. One has the radio telescope data in the image on its own. The other picture was probably taken with the Hubble telescope and they superimposed the radio data on top of the Hubble image. The blobby image is the ALMA radio data image. John. |
Sirius B Send message Joined: 26 Dec 00 Posts: 24876 Credit: 3,081,182 RAC: 7 |
Good question as the original report states Optical, whereas the Mail says Radio. According to the ESO, it's Optical. |
Josef W. Segur Send message Joined: 30 Oct 99 Posts: 4504 Credit: 1,414,761 RAC: 0 |
Both, in the sense that the sub-millimeter wave end of its range overlaps with a part of the electromagnetic spectrum known as far infrared. However, it gets nowhere near the visible light range which human eyes can perceive. Joe |
John McCallum Send message Joined: 5 Dec 04 Posts: 877 Credit: 599,458 RAC: 8 |
If the picture in the Mail is the right one then it is definitely a radio telescope Old enough to know better(but)still young enough not to care |
Sirius B Send message Joined: 26 Dec 00 Posts: 24876 Credit: 3,081,182 RAC: 7 |
That is a Radio Telescope. On checking back to the original thread, it looks like I made a mistake. What caught me out was the labelling of the report in the Mail as VLT. There seems to be 2 seperate telescopes in Chile. Check the link in the original thread from the BBC - the photo of the telescope is nothing like the one in the Mail. Sorry about that guys. Sidenote: either way, they're both excellent telescopes. |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
There are many optical telescopes in Chile, due to the optimal "seeing". The ALMA is a millimeter band radio telescope, with many antennas. Tullio |
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