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GPM - compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies.
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| Limits on the short-timescale near-infrared variability of Seyfert 1 nuclei
We present new time-resolved photometric observations and images at 2.2microns of a small sample of X-ray variable Seyfert 1 nuclei. Aftercorrecting for dilution by the host galaxy in the observing aperture, wecompare the fractional variation, over the timescales of theobservations, in the near-infrared (NIR) to that expected in the X rays.We have not detected with confidence any NIR variability on timescalesshort enough to be incompatible with the dust reradiation scenario. Thegalaxy-corrected upper limits which we have obtained for variations onshort timescales, typical of non-thermal processes, imply that the NIRemission is dominated by a slowly varying, presumably reprocessed,component which accounts for no less than 80%-90% of the total.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Aslan |
| Sað Açýklýk: | 10h26m11.80s |
| Yükselim: | +20°16'34.2" |
| Görünürdeki Parlaklýk: | 9.115 |
| özdevim Sað Açýklýk: | -16.5 |
| özdevim Yükselim: | -42.1 |
| B-T magnitude: | 9.602 |
| V-T magnitude: | 9.156 |
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