Proposal Details - 0720013
Comptonisation processes in Seyfert galaxies (Soldi)

Proposal Abstract

We propose to observe for 1 Msec the bright, OSSE detected Seyfert 1.5 galaxy NGC 7213 whose emission above 20 keV has been poorly studied in the past.BeppoSAX observations have shown the presence of a high-energy cut-off and the absence of a strong reflection component, but neither of these features has been significantly constrained. In addition, X-ray and optical spectroscopy seem to indicate that the narrow Fe Kalpha line detected in this source is produced in the broad line region, a hypothesis supported by the absence of a significant reflection hump. Observations performed simultaneously with IBIS, JEM-X and SPI in the broad range from 3 up to few hundred keV will allow us to study the Componisation signatures, as reflection component and high-energy cut-off, and will enable us to further investigate the possible origin of the reprocessed emission in the Compton-thin BLR of this peculiar object. In addition, simultaneous observations of NGC 7213 with Swift will be performed, being very valuable in order to constrain the shape of the continuum emission and detect the Fe line. Only 31 ksec have been spent up to now by INTEGRAL on the source position, during OMC calibration observations. Therefore, the observation proposed here will also contribute to the long-term goal of having an INTEGRAL coverage of the whole sky at the level of a few 100 ksec.

Observation Strategy (Recommended by TAC)

400 ks in the HEX dithering mode centred on RA, Dec = 332.318, -47.167 (l, b = 349.588, -52.58).

Proposal grade: C

Data Rights (Recommended by TAC)

The TAC has allocated the following specific data rights to this proposal: NGC 7213

Exposure Map

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