Igor V. Moskalenko & Andy W. Strong NASA/GSFC MPE, Germany with Olaf Reimer Bochum, Germany Topics to cover: GALPROP: principles, internal structure, recent results, and perspective GALPROP: principles, internal structure, recent results, and perspective  GALPROP: principles, inputs/outputs, calculations  Recent results (GeV excess & pbars, extragalactic background)  Dark Matter  Near future developments

Igor V. Moskalenko/NASA-GSFC 2 GLAST meeting/SLAC2004/09/27-30 Transport Equation ψ(r,p,t) – ψ(r,p,t) – density per total momentum sources (SNR, nuclear reactions…) convection diffusion diffusive reacceleration E-loss convection fragmentation radioactive decay

Igor V. Moskalenko/NASA-GSFC 3 GLAST meeting/SLAC2004/09/27-30 CR Propagation: Milky Way Galaxy Halo Gas, sources 100 pc 40 kpc Sun 4-12 kpc /ccm 1-100/ccm Intergalactic space 1 kpc~3x10 18 cm R Band image of NGC GHz continuum (NVSS), 1,2,…64 mJy/ beam Optical image: Cheng et al. 1992, Brinkman et al Radio contours: Condon et al AJ 115, 1693 NGC891

Igor V. Moskalenko/NASA-GSFC 4 GLAST meeting/SLAC2004/09/27-30 CR Interactions in the Interstellar Medium e + - Sources: SNRs, Shocks, Superbubbles Particle acceleration Photon emission P He CNO X,γ gas BISRF π e P _ LiBeB ISM diffusion energy losses reacceleration convection etc. π 0 synchrotron IC bremss Chandra GLAST ACE BESS Halo disk escape He CNO solar modulation AMS p

Igor V. Moskalenko/NASA-GSFC 5 GLAST meeting/SLAC2004/09/27-30 GALPROP Input: galdef-files GALPROP is parameter-driven (user can specify everything!) Grids 2D/3D –options; symmetry options (full 3D, 1/8 -quadrants) Spatial, energy/momentum, latitude & longitude grids Ranges: energy, R, x, y, z, latitude & longitude Time steps Propagation parameters D xx, V A, V C & injection spectra (p,e) X-factors (including R-dependence) Sources Parameterized distributions Known SNRs Random SNRs (with given/random spectra), time dependent eq. Other Source isotopic abundances, secondary particles (pbar, e ±, γ, synchro), anisotropic IC, energy losses, nuclear production cross sections…

Igor V. Moskalenko/NASA-GSFC 6 GLAST meeting/SLAC2004/09/27-30 Grids Z R,x,y Typical grid steps (can be arbitrary!) Δz = 0.1 kpc, ΔΔz = 0.01 kpc (gas averaging) ΔR = 1 kpc ΔE = x1.2 (log-grid)

Igor V. Moskalenko/NASA-GSFC 7 GLAST meeting/SLAC2004/09/27-30 Gas Distribution Sun Molecular hydrogen H 2 is traced using J=1-0 transition of 12 CO, concentrated mostly in the plane (z~70 pc, R<10 kpc) Atomic hydrogen H I has a wider distribution (z~1 kpc, R~30 kpc) Ionized hydrogen H II – small proportion, but exists even in halo (z~1 kpc)

Igor V. Moskalenko/NASA-GSFC 8 GLAST meeting/SLAC2004/09/27-30 Interstellar Radiation Field Energy density Sun Stellar Dust CMB

Igor V. Moskalenko/NASA-GSFC 9 GLAST meeting/SLAC2004/09/27-30 Nuclear Reaction Network+Cross Sections p,EC,β + β -, n Be 7 Be 10 Al 26 Cl 36 Mn 54 Plus some dozens of more complicated reactions. But many cross sections are not well known… V 49 Ca 41 Cr 51 Fe 55 Co 57 Ar 37 Secondary, radioactive ~1 Myr & K-capture isotopes

Igor V. Moskalenko/NASA-GSFC 10 GLAST meeting/SLAC2004/09/27-30 Nuclear component in CR: What we can learn? Propagation parameters: Diffusion coeff., halo size, Alfvén speed, convection velosity… Energy markers: Reacceleration, solar modulation Local medium: Local Bubble Material & acceleration sites, nucleosynthesis (r- vs. s-processes) Stable secondaries: Li, Be, B, Sc, Ti, V Radio (t 1/2 ~1 Myr): 10 Be, 26 Al, 36 Cl, 54 Mn K-capture: 37 Ar, 49 V, 51 Cr, 55 Fe, 57 Co Short t 1/2 radio 14 C & heavy Z>30 Heavy Z>30: Cu, Zn, Ga, Ge, Rb Nucleo- synthesis: supernovae, early universe, Big Bang… Solar modulation Diffuse γ-rays Galactic, extragalactic: blazars, relic neutralino Dark Matter (p,đ,e +,γ) -

Igor V. Moskalenko/NASA-GSFC 11 GLAST meeting/SLAC2004/09/27-30 Fixing Propagation Parameters: Standard Way Using secondary/primary nuclei ratio: Diffusion coefficient and its index Propagation mode and its parameters (e.g., reacceleration V A, convection V z ) Radioactive isotopes: Galactic halo size Z h Z h increase B/C Be 10 /Be 9 Interstellar E k, MeV/nucleon

Igor V. Moskalenko/NASA-GSFC 12 GLAST meeting/SLAC2004/09/27-30 Peak in the Secondary/Primary Ratio Leaky-box model: fitting path-length distribution -> free function B/C Diffusion models:  Diffusive reacceleration  Convection  Damping of interstellar turbulence  Etc. Measuring many isotopes in CR simultaneously may help to distinguish

Igor V. Moskalenko/NASA-GSFC 13 GLAST meeting/SLAC2004/09/27-30 Heliosphere Flux 20 GeV/n

Igor V. Moskalenko/NASA-GSFC 14 GLAST meeting/SLAC2004/09/27-30 Electron Fluctuations/SNR stochastic events GeV electrons 100 TeV electrons GALPROP/Credit S.Swordy Energy losses 10 7 yr 10 6 yr Bremsstrahlung 1 TeV Ionization Coulomb IC, synchrotron 1 GeV Ekin, GeV E(dE/dt) -1,yr Electron energy loss timescale: 1 TeV: ~ yr 100 TeV: ~3 000 yr

Igor V. Moskalenko/NASA-GSFC 15 GLAST meeting/SLAC2004/09/27-30 CR Variations in Space & Time More frequent SN in the spiral arms Historical variations of CR intensity over yr (Be 10 in South Polar ice) Konstantinov et al Electron/positron energy losses Different “collecting” areas A vs. p

Igor V. Moskalenko/NASA-GSFC 16 GLAST meeting/SLAC2004/09/27-30 GALPROP Output/FITS files Provides literally everything: All nuclei and particle spectra in every grid point (x,y,R,z,E) -FITS files Separately for π 0 -decay, IC, bremsstrahlung: Emissivities in every grid point (x,y,R,z,E,process) Skymaps with a given resolution (l,b,E,process) “CONSUMERS:” AMS, Pamela – dark matter searches ACE, TIGER – interpretation of isotopic abundances HEAT – electrons, positrons GLAST(?) – spectrum of the diffuse emission & background model

Igor V. Moskalenko/NASA-GSFC 17 GLAST meeting/SLAC2004/09/27-30 numerical solution of cosmic-ray transport 2D or 3D grid time-independent or time-dependent algorithm primary source functions (p, He, C.... Ni) source abundances, spectra primary propagation -starting from maxA=64 source functions (Be, B...., e +,e -, pbars) using primaries and gas distributions secondary propagation tertiary source functions tertiary propagation  -rays (IC, bremsstrahlung, π o -decay) radio: synchrotron

Igor V. Moskalenko/NASA-GSFC 18 GLAST meeting/SLAC2004/09/27-30 GALPROP Calculations Constraints Bin size (x,y,z) depends on the computer speed, RAM; final run can be done on a very fine grid ! No other constraints ! –any required process/formalism can be implemented; vectorization !! Calculations (γ -ray related)  Vectorization options  Heliospheric modulation: routinely force-field, can use Potgieter model 1.For a given propagation parameters: propagate p, e, nuclei, secondaries (currently in 2D) 2.The propagated distributions are stored 3.With propagated spectra: calculate the emissivities (π 0 -decay, IC, bremss) in every grid point 4.Integrate the emissivities over the line of sight: GALPROP has a full 3D grid, but currently only 2D gas maps (H2, H I, H II) Using actual annular maps (column density) at the final step High latitudes above b=40˚ -using integrated H I distribution

Igor V. Moskalenko/NASA-GSFC 19 GLAST meeting/SLAC2004/09/27-30 Near Future Developments Full 3D Galactic structure: 3D gas maps (from S.Digel, S.Hunter and/or smbd else) 3D interstellar radiation & magnetic fields (A.Strong & T.Porter) Cross sections: Blattnig et al. formalism for π 0 -production Diffractive dissociation with scaling violation (T.Kamae) Isotopic cross sections (with S.Mashnik, LANL; try to motivate BNL, JENDL-Japan, other Nuc. Data Centers) Energy range: Extend toward sub-MeV range to compare with INTEGRAL diffuse emission (continuum; 511 keV line) Modeling the local structure: Local SNRs with known positions and ages Local Bubble –may be done at the final calculation step Heliospheric modulation: Implementing a complimentary drift model by M.Potgieter Visualization tool (started) using the classes of CERN ROOT package: images, profiles, and spectra from GALPROP to be directly compared with data Improving the GALPROP module structure (for DM studies) & developing a dedicated Web-site to allow for a communication with users

Igor V. Moskalenko/NASA-GSFC 20 GLAST meeting/SLAC2004/09/27-30 Recent results

Igor V. Moskalenko/NASA-GSFC 21 GLAST meeting/SLAC2004/09/27-30 Wherever you look, the GeV  - ray excess is there ! 4a-f

Igor V. Moskalenko/NASA-GSFC 22 GLAST meeting/SLAC2004/09/27-30 Reacceleration Model: Secondary Pbars B/C ratioAntiproton flux E k, GeV/nucleon E k, GeV

Igor V. Moskalenko/NASA-GSFC 23 GLAST meeting/SLAC2004/09/27-30 Positron Excess ?  Are all the excesses connected somehow ?  A signature of a new physics (DM) ? Caveats:  Systematic errors ?  A local source of primary positrons ?  Large E-losses -> local spectrum… HEAT (Coutu et al. 1999) Leaky-Box GALPROP e + /e E, GeV

Igor V. Moskalenko/NASA-GSFC 24 GLAST meeting/SLAC2004/09/27-30 Matter, Dark Matter, Dark Energy… Ω ≡ ρ/ρ crit Ω tot =1.02 +/−0.02 Ω Matter =4.4%+/−0.4% Ω DM =23% +/−4% Ω Vacuum =73% +/−4% Supersymmetry is a mathematically beautiful theory, and would give rise to a very predictive scenario, if it is not broken in an unknown way which unfortunately introduces a large number of unknown parameters… Lars Bergström (2000) SUSY DM candidate has also other reasons to exist -particle physics…

Igor V. Moskalenko/NASA-GSFC 25 GLAST meeting/SLAC2004/09/27-30 Example “Global Fit:” diffuse γ’s, pbars, positrons  Look at the combined (pbar,e +,γ) data  Possibility of a successful “global fit” can not be excluded -non-trivial !  If successful, it may provide a strong evidence for the SUSY DM pbars e+e+ γ GALPROP/W. de Boer et al. hep-ph/ Supersymmetry:  MSSM  Lightest neutralino χ 0  m χ ≈ GeV  S=½ Majorana particles  χ 0 χ 0 −> p, pbar, e +, e −, γ

Igor V. Moskalenko/NASA-GSFC 26 Nuclear Data-2004/09/28, Santa Fe GeV excess: Optimized model Uses all sky and antiprotons & gammas to fix the nucleon and electron spectra  Uses antiprotons to fix the intensity of CR HE  Uses gammas to adjust  the nucleon spectrum at LE  the intensity of the CR electrons (uses also synchrotron index)  Uses EGRET data up to 100 GeV protons electrons x4 x1.8 antiprotons

Igor V. Moskalenko/NASA-GSFC 27 GLAST meeting/SLAC2004/09/27-30 e + ~0.1e - Diffuse Gammas from Secondary Positrons/Electrons e + /e electrons positrons gammas e + =e - sec.e - =10% Important below 200 MeV Heliosphere Interstellar

Igor V. Moskalenko/NASA-GSFC 28 GLAST meeting/SLAC2004/09/27-30 Anisotropic Inverse Compton Scattering  Electrons in the halo see anisotropic radiation  Observer sees mostly head-on collisions e-e- e-e- head-on: large boost & more collisions γ γ small boost & less collisions γ sun Energy density Z, kpc R=4 kpc high latitudes !

Igor V. Moskalenko/NASA-GSFC 29 GLAST meeting/SLAC2004/09/27-30 Diffuse Gammas at Different Sky Regions Hunter et al. region: l=300°-60°,|b|<10° Intermediate latitudes: l=0°-360°,10°<|b|<20° Outer Galaxy: l=90°-270°,|b|<10° Intermediate latitudes: l=0°-360°,20°<|b|<60°

Igor V. Moskalenko/NASA-GSFC 30 GLAST meeting/SLAC2004/09/27-30 Longitude Profiles |b|<5° MeV 2-4 GeV GeV 4-10 GeV

Igor V. Moskalenko/NASA-GSFC 31 GLAST meeting/SLAC2004/09/27-30 Latitude Profiles: Inner Galaxy MeV 2-4 GeV0.5-1 GeV 4-10 GeV20-50 GeV

Igor V. Moskalenko/NASA-GSFC 32 GLAST meeting/SLAC2004/09/27-30 Latitude Profiles: Outer Galaxy MeV 2-4 GeV GeV 4-10 GeV

Igor V. Moskalenko/NASA-GSFC 33 GLAST meeting/SLAC2004/09/27-30 Extragalactic Gamma-Ray Background Predicted vs. observed E, MeV E 2 xF Sreekumar et al Strong et al Elsaesser & Mannheim, astro-ph/ Blazars Cosmological neutralinos

Igor V. Moskalenko/NASA-GSFC 34 GLAST meeting/SLAC2004/09/27-30 Distribution of CR Sources & Gradient in the CO/H 2 CR distribution from diffuse gammas (Strong & Mattox 1996) SNR distribution (Case & Bhattacharya 1998) Pulsar distribution (Lorimer 2004) sun X CO =N(H 2 )/W CO : Histo –This work, Strong et al.’ Sodroski et al.’95,’97 1.9x Strong & Mattox’96 ~Z -1 – Boselli et al.’02 ~Z Israel’97,’00, [O/H]=0.04,0.07 dex/kpc

Igor V. Moskalenko/NASA-GSFC 35 GLAST meeting/SLAC2004/09/27-30 Again Diffuse Galactic Gamma Rays More IC in the GC – better agreement ! The pulsar distribution vs. R falls too fast OR larger H 2 /CO gradient Very good agreement !

Igor V. Moskalenko/NASA-GSFC 36 GLAST meeting/SLAC2004/09/27-30 Conclusions I Accurate measurements of diffuse gamma rays, secondary antiprotons, and other CR species simultaneously may provide a new vital information for Astrophysics – in broad sense, Particle Physics, and Cosmology. Gamma rays: GLAST is scheduled to launch in 2007 – diffuse gamma rays is one of its priority goals CR species: New measurements at LE & HE simultaneously are highly desirable (Pamela, S-TIGER, AMS…), sec. positrons ! Hunter et al. region: l=300°-60°,|b|<10° Dark Matter Z h increase B/C Be 10 /Be 9

Igor V. Moskalenko/NASA-GSFC 37 GLAST meeting/SLAC2004/09/27-30 Conclusions II Antiprotons: Pamela (2005), AMS (2008) and a new BESS-polar instrument to fly a long- duration balloon mission (in 2004, 2006…), we thus will have more accurate and restrictive antiproton data HE electrons: Several missions are planned to target specifically HE electrons We must be ready! GALPROP is a propagation model to play now

Igor V. Moskalenko/NASA-GSFC 38 GLAST meeting/SLAC2004/09/27-30 Thank you !