Andrzej A. Zdziarski

Centrum Astronomiczne im. M. Kopernika

Warszawa, Poland

A proposed mission in the

MeV range

Report from the meeting in

Paris, 15-16.01.2013

Current astrophysical high-energy

coverage• XMM, Chandra: 0.2 keV–10 keV;

• Suzaku: 0.5–300 keV;

• INTEGRAL: 3 keV–1 MeV;

• Fermi: 0.1–100 GeV;

• Cherenkov telescopes, e.g., HESS, MAGIC,

VERITAS: 0.1 – 10 TeV.

• The missing range: 1 – 100 MeV.

• In the past, only CGRO/COMPTEL covered the

1–10 MeV range, but at a rather low sensitivity.

The sensitivity of existing and

past detectors

missing

coverage

Main astrophysical topics• The Galactic Center

• 511 keV emission from positronium annihilation

• Gamma-ray emission from type Ia supernovae

• Supernovae and radioactivity

• Ti line emission from young supernovae

• Classical Novae explosions

• Continuum emission from particle acceleration in novae

• MeV astronomy in high-energy interstellar medium

• Nuclear gamma-ray lines from low-energy cosmic rays

• Gamma-ray binaries

• Gamma-ray line emission from X-ray binaries

• MeV emission of black-hole binaries from jets and accretion

• Gamma-ray bursts

• Active Galactic Nuclei

• Magnetars and rotation-powered pulsars

• Pulsar wind nebulae

• Supernova remnants and superbubbles

• Terrestial gamma ray flashes

γ-rays:

jet

Cyg X-3: missing 0.2–100 MeV data,

intersection of the jet and accretion spectra

synchrotron

SSC

synchrotron

X-rays:

accretion) bb Compton

thermal Comptonization

nonthermal

Comptonization

blackbody disc

a weak nonthermal tail

from hybrid plasma

Cyg X-1 – sparse or missing MeV data

soft

hard

Fermi upper limits in

the soft state

An example blazar spectrum:

Tavecchio et al. 2002

missing MeV

coverage

511 keV emission from the inner Galaxy –

the bulge emission origin remains unknown

The spectrum of the inner part of the

Galaxy: contribution of point sources in

the MeV range?

Supernovae and anomalous X-ray

pulsars:

Coverage needed

Current studies

Requirements:

The expected sensitivity of GRIPS (an

M3 proposal not chosen by ESA)

Broad band spectra of blazars, pulsars

and gamma ray bursts