S5 1803+78 Revisited
We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1 300 days between major flares is possibly present. No systematic trend of the color index with flux variations is evident, at variance with other...
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CTU Central Library
2012-01-01
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| Series: | Acta Polytechnica |
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| Online Access: | https://ojs.cvut.cz/ojs/index.php/ap/article/view/1508 |
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doaj-f2ff89277cb041ebbbc55aab3e7ff3e72020-11-24T22:57:41ZengCTU Central LibraryActa Polytechnica1210-27091805-23632012-01-015211508S5 1803+78 RevisitedR. NesciA. MaselliF. MontagniS. SclaviWe report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1 300 days between major flares is possibly present. No systematic trend of the color index with flux variations is evident, at variance with other BL Lacs. In one flare, however, the source was bluer in the rising phase and redder in the falling one. Two ?-ray flares were detected by Fermi-GST during our monitoring: on the occasion of only one of them we found simultaneous optical brightening. A one-zone Synchrotron Self Compton (SSC) model appears too simple to explain the source behavior.https://ojs.cvut.cz/ojs/index.php/ap/article/view/1508active galactic nucleiblazarsBL Lac objects |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
R. Nesci A. Maselli F. Montagni S. Sclavi |
| spellingShingle |
R. Nesci A. Maselli F. Montagni S. Sclavi S5 1803+78 Revisited Acta Polytechnica active galactic nuclei blazars BL Lac objects |
| author_facet |
R. Nesci A. Maselli F. Montagni S. Sclavi |
| author_sort |
R. Nesci |
| title |
S5 1803+78 Revisited |
| title_short |
S5 1803+78 Revisited |
| title_full |
S5 1803+78 Revisited |
| title_fullStr |
S5 1803+78 Revisited |
| title_full_unstemmed |
S5 1803+78 Revisited |
| title_sort |
s5 1803+78 revisited |
| publisher |
CTU Central Library |
| series |
Acta Polytechnica |
| issn |
1210-2709 1805-2363 |
| publishDate |
2012-01-01 |
| description |
We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1 300 days between major flares is possibly present. No systematic trend of the color index with flux variations is evident, at variance with other BL Lacs. In one flare, however, the source was bluer in the rising phase and redder in the falling one. Two ?-ray flares were detected by Fermi-GST during our monitoring: on the occasion of only one of them we found simultaneous optical brightening. A one-zone Synchrotron Self Compton (SSC) model appears too simple to explain the source behavior. |
| topic |
active galactic nuclei blazars BL Lac objects |
| url |
https://ojs.cvut.cz/ojs/index.php/ap/article/view/1508 |
| work_keys_str_mv |
AT rnesci s5180378revisited AT amaselli s5180378revisited AT fmontagni s5180378revisited AT ssclavi s5180378revisited |
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