Proposal Details - 0920018
CONTINUING MONITORING OF NGC 4151 (Zdziarski)

Proposal Abstract

It is proposed to continue the monitoring of the X-ray brightest Seyfert galaxy NGC 4151 with INTEGRAL, in order to measure its spectra as a function of the hard X-ray flux level. One will correlate the high energy spectral cutoff with other continuum parameters to determine the main physical mechanism driving the variability. One will also disentangle the contributions to the reflection hump from close and distant reflectors, and correlate those with the narrow iron line variability to determine the nature of the thick reprocessing medium and the geometry of cold matter surrounding the source. One will finally probe for the existence of a hard non-thermal tail.

Observation Strategy (Recommended by TAC)

Total of 800 ks in the standard 5x5 dithering mode centered on RA, Dec = 186.875, 6.075 (l, b = 286.728, 68.190), split in four observations of 200 ks each over the whole of AO-8. The four observations will be simultaneously done with four accepted exposures of 10 ks each with XMM-Newton, i.e., one XMM-Newton pointing per INTEGRAL observation.

Proposal grade: A

Data Rights (Recommended by TAC)

The TAC granted data rights on NGC 4151.

Exposure Map

The exposure maps are in galactic coordinates using the Aitoff projection and units of seconds, and the colour scale is indicated at the bottom. The green lines provide the 100, 300 and 500 ksec contour.