Transcript ppt

Local interstellar emission
 100 MeV – 1 GeV, 6 days, 0.2°x0.2°
~
 5° ≤ |b| ≤ 30°
N  q N(HI )  q

X

HI

~
H 2 W (CO)  I bkg SA T 
N(H 2 )
q
 H2
W (CO) 2q HI
if n CR (HI )  n CR (H 2 )
ln L   N obsi ln( N pred i )   N pred i
i
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CO maps
feb-04
HI maps
feb-04
GLAST 0.1-1 GeV
feb-04
interstellar fit with all sources
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feb-04
qHI = (2.59 ± 0.03) 10-26  at-1 sr-1
(high)
qH2 = (4.6 ± 0.3) 10-6  sr-1 cm-2 K-1 km-1
Ibkg = (1.94 ± 0.03) 10-5  cm-2 s-1 sr-1
X = (0.9 ± 0.1) 1020 mol. cm-2 K-1 km-1 s
asuming 7300 cm²
interstellar fit removing sources
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feb-04
qHI = (2.52 ± 0.03) 10-26  at-1 sr-1
qH2 = (4.6 ± 0.3) 10-6  sr-1 cm-2 K-1 km-1
Ibkg = (1.91 ± 0.03) 10-5  cm-2 s-1 sr-1
X = (0.9 ± 0.1) 1020 mol. cm-2 K-1 km-1 s
source bias <<
not true at |b|<5° !
IC or exotic halo?
asuming 7300 cm²
source profiles
 gaussian fits to longitude and latitude profiles
l   b
feb-04
source profiles
feb-04