Tartalom
Képek
Kép feltöltése
DSS Images Other Images
Kapcsolódó cikkek
GPM - compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies.
Not Available
| 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.
|
Új cikk hozzáadása
Kapcsolódó hivatkozások
- - (nincs kapcsolódó hivatkozás) -
Új link hozzáadása
Besorolás csoportokba:
|
Pozíciós és asztrometriai adatok
| Csillagkép: | Oroszlán |
| Rektaszcenzió: | 10h26m11.80s |
| Deklináció: | +20°16'34.2" |
| Vizuális fényesség: | 9.115 |
| RA sajátmozgás: | -16.5 |
| Dec sajátmozgás: | -42.1 |
| B-T magnitude: | 9.602 |
| V-T magnitude: | 9.156 |
Katalógusok és elnevezések:
|
