Proposal Details - 1120022
INTEGRAL study of supercritical accretion disk nutation in SS433 (Cherepashchuk)

Proposal Abstract

Fixed-time observations are proposed of the galactic microquasar SS433 with a total duration of 500 ks centered at the middle of the orbital hard X-ray eclipse at the disk precessional phase Psi~-0.1 of the source in November 2014. The proposal is the continuation of the set of INTEGRAL observations of the unique galactic source SS433 carried out in previous AOs. The main scientific goal of new observations is to investigate hard X-ray flux variations before and after the X-ray eclipse to investigate disk nutation effects, discovered by previous INTEGRAL observations. These observations will also add to search for long-saught spectral changes across the primary eclipse. The results will be used to understand the physics of super-critical accretion disk and hot scattering corona discovered by INTEGRAL in SS433, a unique feature of SS433 among other galactic micro-quasars.

Observation Strategy (Recommended by TAC)

Total of 500 ks, using a standard 5x5 dither pattern centered at RA, Dec (J2000.0, in degrees) = 287.957, 4.983 (l,b = 39.694, -2.245 degrees). The observations should be done around the orbital primary minimum at the precession phase close to the maximum open disk angle, i.e., 500 ks have to be centred around JD 2456970.223 (UT 2014 November 8, 17:21).

Proposal grade: B

Data Rights (Recommended by TAC)

Data rights were granted on SS433.

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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.

Exposure Map