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| Paper: |
NOT and HST Images of BL Lacs in Comparison |
| Volume: |
159, BL Lac Phenomenon |
| Page: |
395 |
| Authors: |
Sillanpaa, A. |
| Abstract: |
In this study we will compare images of the BL Lac objects taken with the HST and the Nordic Optical Telescope. HST images are taken from the literature but the NOT images are our own exposures. Both of the telescopes have almost identical dimensions but the HST is clearly an "old-type", slow instrument when the NOT is a very fast telescope. This means that with the HST we can easily reach clearly better angular resolution but when we are looking at very low surface brightness objects is the NOT a clearly better instrument. We will show two examples, OJ287 and 2254+074, which clearly show the own advantages of both instruments. After this comparison we can easily say that we can work a lot in this field using also modern ground-based telescopes with a good angular resolution. |
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