Hubbles seful beyond Distance 100 million pc -1 Gpc Useful withi 1 billion -200 Mpc Time Useful within 200 million pc 25 Mpc Useful within 25 million pc Time 10,000pc Useful within 10.000 OBAFGKM -200pc Useful within 200pc 1.U Useful within 1 light Earth
1420MHz and 13Co data(+ X-ray data) 1420 MHz data from the vla. 13Co(=1-0)data from the Galactic Plane Survey(still et Galactic ring survey (jackson et l.2006,AJ,132,1158) al. 2006, ApJS, 163, 145) by the Range 18<167d, -1.36<2.3d Five College Radio Astronomy FWHM:121×1.56km/s Observatory 14m telescope Velocity range: 113-165 km/s Range: 18<1<56d-1<6<1d rms: 2 K per channel FWHM: 46 x46 x0 21 km/s Short-spacing information for the h i line emission from rms:0.13 K per cl observations with the 100m velocity range: -5--135 km/'s Green Bank Telescope (<=40d),-5-85km/S(>=40d)
• 13CO(J=1-0) data from the Galactic ring survey (Jackson et al.2006, ApJS, 163, 145) by the Five College Radio Astronomy Observatory 14m telescope: Range:18<l<56d, -1<b<1d FWHM:46"x46"x0.21 km/s rms:~ 0.13 K per channel. Velocity range: -5-- 135 km/s (<=40d), -5-- 85km/s(>=-40d) 1420 MHz data from the VLA Galactic Plane Survey (Still et al. 2006, AJ, 132, 1158): Range:18<l<67d, -1.3<b<2.3d FWHM: 1'×1'×1.56 km/s Velocity range:-113– 165 km/s rms :2 K per channel Short-spacing information for the H I line emission from observations with the 100m Green Bank Telescope 1420MHz and 13CO data ( + X-ray data)
HI Radiative Transfer Differential Form: I, for hv <kT d 2ki General Solution: MAX )e dr TH 2-Component Solution where T>TBx→ emission andT<Tn→ absorption including H I self-absorption(HISA
An examnle to build ahsorntion spectra to Kes 75 (a TeV source) 21 cm HI map from VLA+GBT observations with contours(28 40 60 100 k)overlaid 0300 Velocity: +95.00 km/s 29.700 Galactic Lon gitude 1420 MHz map from VLa D-array observations Ton(v)-Toff(v)=(Ts-Tbg)(1-e -tau)) solid-line box ---> te on(vr Annulus background Toff(+ 29.600 Galactic Longitude
T An example to build absorption spectra to Kes 75 (a TeV source) 1420 MHz map from VLA D-array observations. 21 cm HI map from VLA+GBT observations with contours (28 40 60 100 k) overlaid Ton (v)-Toff(v)=(Ts-Tbg)(1-e^{-tau}) solid-line box ---> Ton(v) Annulus background Toff(v)
Kes 75 lowe Kes75core absorption spectru 50 50 150 HI+CO1 spectra show that tHe highest absorption velocity=95 km/s, absence of absorption at 102 km/s the tangent point velocity 110 km/s. So d-5.1 to 7.5 kpc Veloclty (km/s)
• HI+CO13 spectra show that the highest absorption velocity~95 km/s, absence of absorption at ~102 km/s, the tangent point velocity ~110 km/s. So d ~ 5.1 to 7.5 kpc