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D e e p o b s e r v a t i o n s o f C a s A wi t h MA G I C i n d i c a t e i t i s n o P e V a t r o n D . G u b e r ma n , J . C o r t i n a , E . d e O a Wi l h e

  1. D e e p o b s e r v a t i o n s o f C a s A wi t h MA G I C i n d i c a t e i t i s n o P e V a t r o n D . G u b e r ma n , J . C o r t i n a , E . d e O ñ a Wi l h e l mi , D . G a l i n d o a n d A . Mo r a l e j o f o r t h e MA G I C c o l l a b o r a t i o n I n s t i t u t d e F i s i c a d ' A l t e s E n e r g i e s ( I F A E ) , T h e B a r c e l o n a I n s t i t u t e o f S c i e n c e a n d T e c h n o l o g y ( B I S T ) B e l l a t e r r a ( B a r c e l o n a ) , S p a i n e - ma i l : d g u b e r ma n @ i f a e . e s

  2. Overview ● C o s mi c r a y s , S u p e r N o v a R e mn a n t s a n d C a s A ● MA G I C c a mp a i g n a n d r e s u l t s ● R e s u l t s i n t e r p r e t a t i o n 2 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  3. Supernova Remnants and cosmic rays G. Morlino (2016): arXiv:1611.10054 ● C o s mi c r a y s ( C R s ) : g a l a c t i c o r i g i n u p 1 5 t o t h e “ k n e e ” ( ~ 3 1 0 e V ) ● A c c e l e r a t i o n s i t e a n d me c h a n i s m s t i l l u n k n o wn S u p e r n o v a R e mn a n t s ( S N R s ) a r e t h e f a v o r i t e c a n d i d a t e f o r b e i n g t h e s e a c c e l e r a t o r s I n f a c t , t h e r e i s a l r e a d y e v i d e n c e o f a c c e l e r a t i o n o f b o t h p a n d e i n S N R s . B u t n o e v i d e n c e ( y e t ) o f p a r t i c l e a c c e l e r a t i o n u p t o 1 0 1 5 e V ! 3 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  4. Cassiopeia A (Cas A) - B r i g h t i n T e V a n d r e l a t i v e l y y o u n g ( ~ 3 0 0 y r ) . . . - d ~ 3 . 4 k p c - A n g u l a r s i z e ~ 5 ' - O b s e r v e d i n γ r a y s b y F e r mi , H E G R A , V E R I T A S a n d MA G I C - S e v e r a l e mi s s i o n r e g i o n s i d e n t i fj e d i n R a d i o a n d X - r a y s - F o r w a r d a n d r e v e r s e s h o c k i d e n t i fj e d - B ~ 3 0 0 u G ( c o u l d b e l o w e r i n s o me r e g i o n s ) - U n u s u a l l y h i g h F I R fj e l d C h a n d r a We k n o w r e a s o n a b l y we l l s e v e r a l p a r a me t e r s t h a t a r e n e e d e d f o r r a d i a t i o n a n d a c c e l e r a t i o n mo d e l s ! → G o o d c a n d i d a t e f o r a c c e l e r a t i o n s t u d i e s 4 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  5. Cas A in γ rays Ha d r o n i c o r l e p t o n i c o r i g i n o f γ - r a y e mi s s i o n ? I s C a s A a P e V a t r o n ? ● C u r r e n t mo d e l s s u g g e s t G e V - T e V e mi s s i o n i s ma i n l y o f h a d r o n i c o r i g i n ( S a h a e t a l . , 2 0 1 5 ; , Z i r a k a s h v i l i e t a l . , 2 0 1 4 ) ● A l s o s u g g e s t i t mi g h t “ o n l y ” b e a b l e t o a c c e l e r a t e p u p t o a f e w h u n d r e d T e V ( B e l l e t a l . , 2 0 1 3 ) O u r k n o w l e d g e c o u l d b e i mp r o v e d . . . C h a n d r a ● B y i d e n t i f y i n g t h e γ - r a y e mi s s i o n r e g i o n ● Wi t h mo r e a c c u r a t e s p e c t r a l me a s u r e me n t s a t T e V e n e r g i e s Z i r a k a s h v i l i e t a l , A p J 7 8 5 : 1 3 0 ( 2 0 1 4 ) “ T h e a mb i g u i t y , w h i c h i s a l a r g e s t a t i s t i c a l u n c e r t a i n t i e s o f T e V γ - r a y fm u x e s , l e a v e s o p e n t h e q u e s t i o n w h e t h e r C a s A a c c e l e r a t e s p a r t i c l e s t o P e V e n e r g i e s ” ( A h a r o n i a n , F . , A s t r o p a r t i c l e P h y s i c s 4 3 ( 2 0 1 3 ) 7 1 – 8 0 ) 5 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  6. MAGIC campaign ● We a c c u mu l a t e d ~ 1 6 0 h r o f g o o d q u a l i t y d a t a ( D e c 2 0 1 4 - O c t 2 0 1 6 ) ● A l l d a t a f o r z e n i t h a n g l e s Z d : ~ 3 0 - 5 0 º ● ~ 7 0 % o f d a t a t a k e n u n d e r mo o n l i g h t ( s e e d e d i c a t e d p o s t e r : MA G I C p e r f o r ma n c e u n d e r mo o n l i g h t , G A 1 2 0 , B o a r d 2 2 6 . F u l l a r t i c l e : a r X i v : 1 7 0 4 . 0 0 9 0 6 ) MA G I C i s a s y s t e m o f t w o 1 7 m d i a me t e r ● A l s o a n a l y z e d mo r e t h a n 8 y r o f F e r mi d a t a I A C T t e l e s c o p e s d e s i g n e d t o o b s e r v e v e r y h i g h e n e r g y ( V H E , ≥ 5 0 G e V ) γ r a y s , l o c a t e d i n L a P a l ma ( S p a i n ) , a t R o q u e d e l o s Mu c h a c h o s o b s e r v a t o r y . 6 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  7. MAGIC results F i t t e d MA G I C s p e c t r u m a s s u mi n g : ● P u r e p o w e r - l a w ( P WL ) ● P o w e r - l a w w i t h e x p o n e n t i a l c u t - o fg ( E P WL ) E P WL p r e f e r r e d o v e r P WL wi t h 4 . 6 σ s i g n i fj c a n c e ! → C u t - o fg a t ~ 3 . 5 T e V F e r mi s p e c t r a l i n d e x : MA G I C fj t : Γ =( 2.4 ± 0.1 stat ± 0.2 sys ) Γ 1 =( 0.90 ± 0.08 ) E c = 3.5 (+ 1.6 (+ 0.8 − 1.0 ) − 0.9 ) TeV − Γ f ( E ) = N ( E / E ) e x p ( − E / E ) Γ 2 =( 2.37 ± 0.04 ) 0 0 c stat sys 7 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  8. MAGIC results ● E − Γ P WL → f ( E ) = N ( E / E ) e x p ( − E / E ) 0 0 c ● N u l l h y p o t h e s i s : N o c u t - o fg ( E → ∞ , P WL ) c ● A L i k e l i h o o d r a t i o t e s t b e t w e e n t h e t w o mo d e l s f a v o r t h e E P WL o v e r t h e P WL 4 . 6 σ s i g n i fj c a n c e w i t h ( p = 0 . 4 2 ) MA G I C E P WL fj t r e s u l t s : − 2 s − 11 TeV − 1 cm − 1 N 0 =( 1.1 ± 0.1 stat ± 0.2 sys )× 10 Γ =( 2.4 ± 0.1 stat ± 0.2 sys ) ( p = 6 . 1 0 - 4 ) E c = 3.5 (+ 1.6 (+ 0.8 − 1.0 ) − 0.9 ) TeV stat sys 8 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

  9. SED modeling P e r f o r me d s o me s i mp l e mo d e l i n g u s i n g n a i ma 1 . T e s t e d s i mp l e o n e - z o n e p u r e h a d r o n i c a n d l e p t o n i c mo d e l s w i t h a v a i l a b l e mu l t i w a v e l e n g t h ( MWL ) d a t a . P a r e n t p o p u l a t i o n ( o f p r o t o n s o r e l e c t r o n s ) d e s c r i b e d b y a p o w e r - l a w w i t h c u t o fg . P a r a me t e r s t o p l a y w i t h : N o r ma l i z a t i o n ( N ) , s p e c t r a l i n d e x α a n d E . p c u t o fg f ( E ) = N ( E / E ) − α e x p ( − E / E ) p / e 0 c u t o f R a d i a t i v e mo d e l s H a d r o n i c mo d e l : P i o n D e c a y . L e p t o n i c mo d e l : S y n c h r o t r o n , B r e ms s t r a h l u n g , I n v e r s e C o mp t o n 1 “ a P y t h o n p a c k a g e f o r c o mp u t a t i o n o f n o n - t h e r ma l r a d i a t i o n f r o m r e l a t i v i s t i c p a r t i c l e p o p u l a t i o n s ” ( h t t p : / / n a i ma . r e a d t h e d o c s . i o / e n / l a t e s t / # ) 9 J u l y 1 3 t h 2 0 1 7 D . G u b e r ma n - 3 5 t h I C R C , B u s a n

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