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Query : 2000ApJ...534..180E |
2000ApJ...534..180E - Astrophys. J., 534, 180-188 (2000/May-1)
Intensive HST, RXTE, and ASCA monitoring of NGC 3516: evidence against thermal reprocessing.
EDELSON R., KORATKAR A., NANDRA K., GOAD M., PETERSON B.M., COLLIER S., KROLIK J., MALKAN M., MAOZ D., O'BRIEN P., SHULL J.M., VAUGHAN S. and WARWICK R.
Abstract (from CDS):
The soft and hard X-ray light curves were strongly correlated, with no evidence for a significant interband lag. Likewise, the optical continuum bands (3590 and 5510 Å) were also strongly correlated, with no measurable lag, to 3 σ limits of ≲0.15 day. However, the optical and X-ray light curves showed very different behavior, and no significant correlation or simple relationship could be found. These results appear difficult to reconcile with previous reports of correlations between X-ray and optical variations and of measurable lags within the optical band for some other Seyfert 1 galaxies.
These results also present serious problems for ``reprocessing'' models in which the X-ray source heats a stratified accretion disk, which then reemits in the optical/ultraviolet: the synchronous variations within the optical would suggest that the emitting region is ≲0.3 lt-day across, while the lack of correlation between X-ray and optical variations would indicate, in the context of this model, that any reprocessing region must be ≳1 lt-day in size. It may be possible to resolve this conflict by invoking anisotropic emission or special geometry, but the most natural explanation appears to be that the bulk of the optical luminosity is generated by some mechanism other than reprocessing.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Active - galaxies: individual (NGC 3516) - Galaxies: Seyfert - X-Rays: Galaxies
Simbad objects: 6
Number of rows : 6 |
N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2024 |
#notes |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | NGC 3516 | Sy1 | 11 06 47.4632200800 | +72 34 07.298374656 | 13.12 | 12.40 | ~ | 1543 | 0 | |||
2 | NGC 4051 | Sy1 | 12 03 09.6101337312 | +44 31 52.682601288 | 11.08 | 12.92 | 9.94 | ~ | 2165 | 1 | ||
3 | NGC 4151 | Sy1 | 12 10 32.5759813872 | +39 24 21.063527532 | 12.18 | 11.48 | ~ | 3688 | 2 | |||
4 | ESO 383-35 | Sy1 | 13 35 53.7691256160 | -34 17 44.160716796 | 13.89 | 13.61 | 8.9 | ~ | 1483 | 0 | ||
5 | NGC 5548 | Sy1 | 14 17 59.5400291832 | +25 08 12.603122268 | 14.35 | 13.73 | ~ | 2709 | 0 | |||
6 | NGC 7469 | Sy1 | 23 03 15.6 | +08 52 26 | 12.60 | 13.00 | 12.34 | ~ | 2095 | 3 |
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