-Cygni -Cygni the GeV to TeV Morphology the GeV to TeV - - PowerPoint PPT Presentation

Marcel C. Strzys

γ γ-Cygni

• Cygni

the GeV to TeV Morphology the GeV to TeV Morphology with with MAGIC and Fermi-LAT MAGIC and Fermi-LAT

Marcel C. Strzysa

• I. Vovka, C. Frucka, S. Masudab

and T. Saitob for the MAGIC Collaboration

a) Max Planck Institute for Physics, Germany b) Kyoto University, Japan

ICRC 2017 Busan, 17th Jul. 2017

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 2/9 Marcel C. Strzys

Gamma-ray supernova remnants Gamma-ray supernova remnants

[VERITAS ICRC 2015]

• π0 Cutofg → Evidence

for hadronic CRs

• Interaction region

bright

• Matured SNRs

(≈ 104 yrs)

• Shell bright
• Leptonic /

hadronic ?

• ≈ 1-5 103 yrs

[H.E.S.S. - Aharonian+ 2007]

[Funk ‘15]

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 3/9 Marcel C. Strzys

The The γ γ-Cygni supernova remnant

• Cygni supernova remnant

Age: 5 – 10 kyr

SNR clearly in Sedov phase: → reverse shock hit centre 1.5 kyr ago [Hui+‘14] Remnant of a core-collapse SNR (PSR at the centre) Distance: 1.5 – 2.6 kpc Extend: ≈0.56⁰ radius , (≈17 pc)

[English+T aylor/CGPS]

[ 1 4 2 M H z D a t a f r

• m

C G P S ]

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 4/9 Marcel C. Strzys

γ γ-Cygni in

• Cygni in γ

γ-rays

• rays

Detected at T

eV by VERITAS using 21 h obs. time → extended emission (σ=0.23⁰) towards north-west → power-law spectrum (Γ=2.37+/-0.14) → integral fmux 3% Crab Units Fermi-LAT observes emission all over shell at GeV energies < 10 GeV emission dominated by PSR J2021+4026 → only known γ-ray variable PSR

[ L a n d e + ’ 1 2 ] [ A l i u + ’ 1 3 ] TeV VERITAS (> 320 GeV) GeV Fermi-LAT (> 15 GeV)

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 5/9 Marcel C. Strzys

MAGIC observations of MAGIC observations of γ γ-Cygni

• Cygni

Situated at the Observatorio Roque de

los Muchachos @ 2200 m a.s.l. Stereo system of 2 x 17m telescopes Energy range from 50 GeV – 50 T eV

• Obs. time 46 h

Data selection: aerosol transmission (>80%) measured with LIDAR system [Aleksić+’16]

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 6/9 Marcel C. Strzys

MAGIC view on MAGIC view on γ γ-Cygni

• Cygni

Emission strongest in the

north-west: → bright extended source → part of emission aligned along shell → hint for emission inside shell PSR not visible Emission can be well described by multiple component model: → Disk matching radio shell → Gaussian source Simultaneous 2D-Likelihood fjt: → novel SkyPrism program → 5.7 σ for disk → 11.9 σ for Gaussian

Preliminary

◆ : PSR 2021+4026 ★ : Sadr (mag. 2.2) ─ : 408 MHz Cont. (CGPS)

> 200 GeV

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 7/9 Marcel C. Strzys

Energy dependent morphology Energy dependent morphology

Energy

• > 50 GeV emission

concentrated towards north-west, compare [Fraija+’16]

• > 450 GeV emission
• utside shell

200 - 450 GeV - MAGIC > 450 GeV - MAGIC 50 - 200 GeV - Fermi-LAT 15 - 50 GeV - Fermi-LAT

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 8/9 Marcel C. Strzys

ISM around the SNR ISM around the SNR

• S
• f

t X

• r

a y s s h

• w

s h

• c

k h e a t e d g a s i n n

• r

t h d e n s e r m e d i u m , b u t n

• M

a s e r f

• u

n d →

• A

G N c l

• s

e t

• S

N R , b u t n

• c
• u

n t e r p a r t w h e r e T e V e m i s s i

• n

i s f

• u

n d

• C

O e m i s s i

• n

n e x t t

• M

A G I C e m i s s i

• n

r e g i

• n
• H

i n t f

• r

a H I s h e l l s u r r

• u

n d i n g t h e S N R , c a v i t y w a l l c r e a t e d b y p r

• g

e n i t

• r

[ L a d

• u

c e u r + ’ 8 ]

[Ladouceur+’08] HI [-11 to -19 km/s] [ . 5

• 2

k e V ] ROSAT PSPC CO 2->1 contours + MAGIC flux map (Planck)

• Mon. 17. July 2017

γ-Cygni with MAGIC | ICRC Busan 9/9 Marcel C. Strzys

Summary Summary

MAGIC observations revealed

multiple component morphology Spectrum consistent with Fermi and VERITAS Energy dependent morphology: → LE (<450 GeV) confjned in shell → HE extending beyond Leakage of CRs interacting with cloud or cavity wall as plausible scenario

Thank you for your attention and interest!