S a m u e l B o i s s i e r , L a b o r a t o - PowerPoint PPT Presentation

http://mission.lam.fr/vestige/index.html S a m u e l B o i s s i e r , L a b o r a t o i r e d ' A s t r o p h y s i q u e d e M a r s e i l l e 1

The Team 2

Galaxies and gas in clusters C l u s t e r e n v i r o n me n t : - h i g h g a l a x y d e n s i t y ( ρ g ~ 1 0 0 g a l M p c ) - 3 a l - h i g h v e l o c i t y d i s p e r s i o n ( v ~ 1 0 0 0 k m s ) - 1 - I C M : h o t ( T ~ 1 0 - 1 0 K ) 7 8 a n d d e n s e ( ρ I M ~ 1 0 c m ) . - 3 - 3 C P e r t u r b i n g me c h a n i s ms : - s t a r v a t i o n - g a l a x y h a r a s s m e n t - r a m p r e s s u r e - t h e r m a l e v a p o r a t i o n c l u s t e r : V I R G O U V : ( U V ) • G U V i C S Q u e s t i o n s : V i s i b l e : - F r a c t i o n o f g a l a x i e s a f f e c t e d ? • N G V S F I R : - D o m i n a n t p r o c e s s ? • H e V i C S H I : + • - E f f e c t o n s t a r f o r m a t i o n A L F A L F A + - F a t e o f s t r i p p e d g a s V I V A A S K A P 4

VESTIGE : a CFHT Large Program V i r g o E n v i r o n m e n t a l S u r v e y T r a c i n g I o n i s e d G a s E m i s s i o n ● L P ( 2 0 1 7 - 2 0 1 9 ) , M e g a C a m @C F H T ( 1 x 1 ) o o ● 5 0 n i g h t s a l l o c a t e d t o c o v e r t h e V i r g o c l u s t e r w i t h i n 1 v i r i a l r a d i u s ( ~ 1 0 4 ) o 2 ● I n t e g r a t i o n t i m e : ● 2 h i n t h e n e w H α f i l t e r ( λ = 6 5 6 3 Å , Δλ = 1 0 6 Å ; T = 9 3 % ) , ● 1 2 m i n i n r ( f o r t h e s t e l l a r c o n t i n u u m s u b t r a c t i o n ) • S e n s i t i v i t y : ● f α ~ 2 x 1 0 e r g s e c c m ( 5 ) σ - 1 7 - 1 - 2 ( H ) f o r p o i n t s o u r c e s α ~ 2 x 1 0 e r g s e c c m a r c s e c ( 1 ) Σ σ - 1 8 - 1 - 2 - 2 ( H ) ● a t 3 a r c s e c r e s o l u t i o n α H narrow band: Yagi et al • M e d i a n s e e i n g 0 . 6 5 a r c s e c . 2010 ; Fossati et al 2012 ; Gavazzi et al 2001 ; ( A t h e V i r g o C l u s t e r d i s t a n c e : 1 a r c s e c = 8 0 p c ) Boselli & Gavazzi 2014 ; Yoshida et al 2002 ; Kenney • E l i x i r - L S B p o i n t i n g s t r a t e g y f o r s k y b a c k g r o u n d . et al 2008 ; Sun et al 5 2007 ; Zhang et al 2013

VESTIGE : a CFHT Large Program V i r g o E n v i r o n m e n t a l S u r v e y T r a c i n g I o n i s e d G a s E m i s s i o n V I R G O T h e e f f e c t s o f t h e e n v i r o n m e n t o n g a l a x y e v o l u t i o n S C I E N C E T h e f a t e o f t h e s t r i p p e d g a s i n c l u s t e r g a l a x i e s T h e s t a r f o r m i n g p r o c e s s i n n e a r b y g a l a x i e s T h e i o n i s e d g a s e m i s s i o n i n e a r l y - t y p e g a l a x i e s T h e H α l u m i n o s i t y f u n c t i o n o f g a l a x i e s T h e H α s c a l i n g r e l a t i o n i n g a l a x i e s T h e n a t u r e o f d a r k g a l a x i e s T h e d y n a m i c a l s t r u c t u r e o f t h e V i r g o c l u s t e r T h e H I I l u m i n o s i t y f u n c t i o n o f c l u s t e r g a l a x i e s P l a n e t a r y n e b u l a e a n d t h e o r i g i n o f t h e i n t r a c l u s t e r l i g h t T h e d i f f u s e i o n i s e d e m i s s i o n o f t h e M i l k y Wa y F O R E G R O U N D H i g h v e l o c i t y c l o u d s , c o m p a c t s o u r c e s a n d G a l a c t i c f o u n t a i n s S C I E N C E H i g h r e d s h i f t e m i s s i o n l i n e g a l a x i e s ( L y , [ O I I ] , [ O I I I ] ) α B A C K G R O U N D Q S O s S C I E N C E 6

Status ● 2 4 4 v a l i d a t e d f r a m e s i n t h e r - b a n d ( 6 0 s e c e x p o s u r e ) a n d 2 6 8 ( 6 0 0 s e c ) i n t h e α , f o r a t o t a l o f 5 4 . 4 2 h o u r s ( e x p . t i m e ) . H ● d a t a f u l l y p r o c e s s e d w i t h E l i x i r - L S B . ● d a t a f u l l y r e d u c e d w i t h M e g a P i p e ( a s t r o m e t r i c c o r r e c t i o n , p h o t o m e t r i c c a l i b r a t i o n a n d t h e s t a c k i n g o f t h e d i f f e r e n t f r a m e s ) . ● o n - g o i n g o p t i m i s a t i o n o f t h e p i p e l i n e f o r s t e l l a r c o n t i n u u m s u b t r a c t i o n f o r s o u r c e s o f d i f f e r e n t c o l o r . ● v e r i f i c a t i o n o f p e r f o r m a n c e s ( s e n s i t i v i t y / s e e i n g ) ● D e s c r i p t i o n o f t h e s u r v e y i n “ A V i r g o E n v i r o n m e n t a l S u r v e y T r a c i n g I o n i s e d G a s E m i s s i o n ( V E S T I G E ) . I . I n t r o d u c t i o n t o t h e S u r v e y ” – B o s e l l i e t a l . , i n p r e p a r a t i o n 7

Filaments in M87 Gavazzi et al. 2000 1.2 arcsec seeing Wide Field Camera - INT Difguse emission in early-type galaxies in Virgo, both in massive E and dE ● Shocks in merging/interactjng systems ● Difguse emission from evolved stellar populatjons ● Residual star formatjon (core of recently formed dE) Belfiore et al. 2016 – Michielsen et al. 2004 – Boselli et al. 2008 8

Star forming regions in NGC4254 UV GALEX ugr NGVS SF regions detected in FUV and NUV ; a few detectjon in u 9

Star forming regions in NGC4254 UV GALEX VESTIGE Hα Boselli et al 2017 Identjfjcatjon of resolved HII regions of luminosity down to 10^37 erg/s New H α measurements to constrain star formatjon propertjes in outer regions (IMF, stochastjcity). 10

Ram Pressure Stripping In NGC4569 From pilot observations Boselli et al 2016 11

Ram Pressure Stripping In NGC4569 ionised gas mass in the tail = large fractjon of stripped HI Ionisatjon in situ (not star formatjon) Very limited (if not 0) star formatjon linked to RPS (see also Boissier et al. 2012) Gas expelled by the nuclear outglow is ~ 1% that removed by ram pressure Boselli et al 2016 12

Ram Pressure Stripping In NGC4330 Chung et al 2007 Fossati et al 2017 13

http://mission.lam.fr/vestige/index.html Boselli et al. 2016 α O n g o i n g L a r g e P r o g r a m : H s u r v e y i n t h e V i r g o c l u s t e r F i r s t R e s u l t s - F i l a m e n t s a n d d i f f u s e s t r u c t u r e s i n E a n d d E - I o n i s e d G a z i n r a m - p r e s s u r e s t r i p p e d s y s t e m s - H I I r e g i o n s i n o u t e r r e g i o n s o f V i r g o g a l a x i e s S t a y t u n e d f o r m o r e 14