Discovery of a recombination dominant plasma: a relic of a giant flare of Sgr A*?
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1 Dicovry of a rcombination dominant plama: a rlic of a giant flar of Sgr A*? Shinya Nakahima (Kyoto Univ.) M. Nobukawa 1, H. Uchida 1, T. Tanaka 1, T. Turu 1, K. Koyama 1,2, H. Uchiyama 3, H. Murakami 4
2 Outflow from GC in variou Frmi bubbl 1 kpc outflow - Frmi bubbl (Su+1) ~ 1 kpc - Magntizd radio outflow (Carrtti +13) 1 pc cal outflow ~ 1 pc - Galactic cntr lob (Sofu+84, Law +1) - IR galactic cntr bubbl (Molinari ~ 3 pc I thr any hot ga outflow? -> W hav archd outflow in X-ray band.
3 Outflow-lik miion in X-ray band Galactic Latitud (dgr) ASCA kv Sgr A* W dicovrd outflow-lik miion with ASCA. - ~1 pc cal. - photon tatitic ar limitd and dtaild natur i not clar ~ 1 pc 1.. Galactic Longitud (dgr)
4 Outflow-lik miion in X-ray band Galactic Latitud (dgr) ASCA kv Sgr A* 1 ~ 1 pc 1.. Galactic Longitud (dgr) Suzaku kv North South W dicovrd outflow-lik miion with ASCA. - ~1 pc cal. - photon tatitic ar limitd and dtaild natur i not clar. W confirmd th miion with Suzaku. - Not all th rgion hav bn covrd by Suzaku yt. - good photon tatitic and high contrat imag. W invtigatd dtaild natur of th miion with Suzaku data.
5 Spctrum of th outh miion (Nakahima +13) Sgr A*. 1 ~ 1 pc Rf 2 1. Rf Rf N Mg Si S Ar Suzaku 1-3 kv 1 Sgr A* 1 Rf 1 2. Galactic latitud (dgr) Background modl Count 1 kv Galactic latitud (dgr) 2 Enrgy (kv) 1 Thr i no xc in th hard X-ray band. W obtaind a pctrum from th brightt part of th outh miion. Background lvl i timatd from narby fild. Suzaku -8 kv Dtct miion lin from highly ionizd atom -> miion from plama (~17 K). Galactic longitud (dgr)
6 South miion i ovr-ionizd plama Compard th data with phyical plama modl 1 - CIE plama modl Not Colliional Ionization Equilibrium (CIE) plama 1-1 k V γ colliional xcitation χ Enrgy (kv)
7 South miion i ovr-ionizd plama Compard th data with phyical plama modl 1 - CIE plama modl Not Colliional Ionization Equilibrium (CIE) plama 1-1 k V H-lik Si Kα Fr-bound continuum γ colliional xcitation χ Enrgy (kv)
8 South miion i ovr-ionizd plama Compard th data with phyical plama modl 1 - CIE plama modl Not Colliional Ionization Equilibrium (CIE) plama 1-1 k V - 1 χ H-lik Si Kα Fr-bound continuum Enrgy (kv) γ colliional xcitation rcombination Ridual indicat th plama i ovr-ionizd and dominatd by rcombination proc. γ
9 South miion i ovr-ionizd plama k V - 1 χ Compard th data with phyical plama modl kt kt init -1 kt Ovr-ionizd plama modl H-lik Si Kα nt NEI Tim Scal CIE plama modl Rcombining Fr-bound continuum CIE ~1 12 cm Enrgy (kv) Not Colliional Ionization Equilibrium (CIE) plama γ colliional xcitation rcombination Ridual indicat th plama i ovr-ionizd and dominatd by rcombination proc. γ
10 South miion i ovr-ionizd plama Compard th data with phyical plama modl 1 - CIE plama modl Not Colliional Ionization Equilibrium (CIE) plama 1-1 k V - 1 χ H-lik Si Kα Fr-bound continuum Enrgy (kv) γ colliional xcitation rcombination Ridual indicat th plama i ovr-ionizd and dominatd by rcombination proc. γ
11 South miion i ovr-ionizd plama k V - 1 χ χ Compard th data with phyical plama modl H-lik Si Kα CIE Ovr-ionizd plama modl plama modl Fr-bound continuum Enrgy (kv) Enrgy (kv) Not Colliional Ionization Equilibrium (CIE) plama γ colliional xcitation rcombination Ridual indicat th plama i ovr-ionizd and dominatd by rcombination proc. γ
12 South miion i ovr-ionizd plama k V - 1 χ χ Compard th data with phyical plama modl H-lik Si Kα CIE Ovr-ionizd plama modl plama modl Fr-bound continuum Enrgy (kv) Enrgy (kv) Not Colliional Ionization Equilibrium (CIE) plama γ colliional xcitation rcombination Ridual indicat th plama i ovr-ionizd and dominatd by rcombination proc. Plama paramtr - kt =. kv - ktinit = 1.6 kv - nt = x 1 11 cm -3 - NH = 9 x 1 21 cm -2 -> GC ditanc - n ~.1 cm -3 -> ag ~.1 Myr γ
13 Spatial variation of plama paramtr Divid FOV into annular rgion and prformd th am Sgr. 39. High Low kt CIE ovrionizd nt (/cm 3 ) 9.E+11 9E+11 1 x 8.E+11 8E+11 7.E+11 7E+11 7 x E+11 6E+11.E+11 x 1 11 E+11 Dnity (/cm 3 ).2 Prur (V/cm 3 ) 2E E E E E-1 6 1E-1 8E E E-11.2 Dnity & prur ar narly uniform within a 2E-11
14 Poibl origin of th outh plama In ordr to form th ovr-ionizd plama, photo-ionization or rapid lctron cooling i rquird. Larg thrmal nrgy of >1 1 rg (1 tim largr than a typical SNR). -> larg nrgy injction i rquird. - Multipl uprnova i not favor bcau thr i no tar forming rgion. - Plama i formd by pat GC activity -> uggt two poibl cnario.
15 Poibl origin of th outh plama In ordr to form th ovr-ionizd plama, photo-ionization or rapid lctron cooling i rquird. Larg thrmal nrgy of >1 1 rg (1 tim largr than a typical SNR). -> larg nrgy injction i rquird. - Multipl uprnova i not favor bcau thr i no tar forming rgion. - Plama i formd by pat GC activity -> uggt two poibl cnario. Scnario 1... Sgr A* jt origin (analogy of Syfrt galaxi) - Pat jt from Sgr A* hockd th dn ISM. - Strong radiation from th NGC 428
16 Poibl origin of th outh plama In ordr to form th ovr-ionizd plama, photo-ionization or rapid lctron cooling i rquird. Larg thrmal nrgy of >1 1 rg (1 tim largr than a typical SNR). -> larg nrgy injction i rquird. - Multipl uprnova i not favor bcau thr i no tar forming rgion. - Plama i formd by pat GC activity -> uggt two poibl cnario. Scnario 1... Sgr A* jt origin (analogy of Syfrt galaxi) - Pat jt from Sgr A* hockd th dn ISM. - Strong radiation from th Scnario 2... tarburt origin (analogy of tarburt galaxi) - Pat mini tarburt formd outflow of th plama. - Adiabatic xpanion caud rapid lctron cooling. NGC 428 M82
17 Spctrum of th north miion Galactic Latitud 1... Suzaku 1-3 Src Bgd χ Count CIE plama modl kt =.8 kv NH = 2.7 x 1 22 cm -2.. Galactic Longitud Enrgy (kv) Plama i not in ovr-ionizd tat but in CIE, bcau.8 kv CIE plama modl rprnt th data -> conitnt with low-latitud rgion of th outh plama. It i poibl that plama at highr-latitud rgion i in ovr-ionizd tat, conidring th patial variation of th outh plama. Hydrogn column dnity indicat th plama i in th GC ditanc.
18 Corrlation with othr wavlngth Thr i no clar countrpart for th outh plama. Th north plama patially coincid with th fatur in othr wavlngth. 1. Galactic Latitud 1... ASCA X-ray imag Hα miion (Law+1) Doubl hlix nbula (Morri+6) GC radio lob (Souf+84) => Th upport th origin of pat GC activity.... Galactic Longitud
19 Summary From th ASCA and Suzaku obrvation, w dicovrd outflow-lik X-ray miion. Analyi of th outh plama how that th plama i in ovrionizd tat, and hav larg thrmal nrgy. -> pat Sgr A* jt or tarburt i poibl origin. Analyi of th north miion how that th plama i in CIE tat, and hav larg thrmal nrgy. -> corrlation with outh miion i not clar at thi tim, but th origin could b alo pat GC activity. Th north plama ha a corrlation with othr wavlngth.
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