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Orion-KL EVLA spectrum Karl Menten, Dec. 28, 2010 Received spectra from R. Perley on Dec. 23 and 28, 2010 Frequency range 23654.50–26654.37 MHz Subtracted.

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Presentation on theme: "Orion-KL EVLA spectrum Karl Menten, Dec. 28, 2010 Received spectra from R. Perley on Dec. 23 and 28, 2010 Frequency range 23654.50–26654.37 MHz Subtracted."— Presentation transcript:

1 Orion-KL EVLA spectrum Karl Menten, Dec. 28, 2010 Received spectra from R. Perley on Dec. 23 and 28, 2010 Frequency range – MHz Subtracted MHz to frequencies so that NH 3 lines are centered at their rest frequencies. Scale was fixed by assuming an LSR velocity of ≈ +8 km/s (for the (J,K) = (1,1), (2,2),and (3,3) lines (Barrett et al. 1977, ApJ 211, L39) (Barrett et al. 1977, ApJ 211, L39) Comment: Data appear to be of very high quality. There are a few single channel spikes of intensity a few sigma increased noise level at frequencies higher than 24.5 GHz

2 Line content of spectrum Detect total of 31 “strong”(ish) lines 29 previously detected in ISM, listed on Lovas’ website: Dominated by lines from ammonia (NH 3 ) and methanol (CH 3 OH) Two E/A doublets of methyl formate CH 3 CHO OCS 2-1 three SO 2 lines with Energies of 35, 42, and 253 K above the ground state ~1 unidentified line above 5 cal. units There certainly are (unidentified, but possiby identifiable) weaker lines in the spectrum

3 Ammonia (NH 3 ) 8 lowest meta-stable inversion transitions (J,K) = (1,1), (2,2), (3,3), up to (8,8) non-meta-stable (9,8) and (10,9) lines (6,6) line from 15 NH 3 isotopologue, [ 14 N/ 15 N]≈250 (weak) 4(1,4)-4(0,4) line from singly deuterated ammonia, NH 2 D

4 Methanol (CH 3 OH) ten strong maser lines from J k=2 -J k=1 E-type series (J = 2 –11) between 24.9 and 26.3 GHz non-meta-stable (9,8) and (10,9) lines (6,6) line from 15 NH 3 isotopologue, [ 14 N/ 15 N]≈250 (weak) 4(1,4)-4(0,4) line from singly deuterated ammonia, NH 2 D

5 Line rest frequencies ( 5) NH3 9(8)-9(8) ( 1) NH3 1(1)-1(1) F,F1=3/2,1-5/2, ( 1) NH3 1(1)-1(1) F,F1=1/2,1-3/2, ( 1) NH3 1(1)-1(1) F,F1=5/2,2-5/2, ( 1) NH3 1(1)-1(1) F,F1=3/2,2-3/2, ( 2) NH3 1(1)-1(1) F,F1=1/2,0-1/2, ( 5) NH3 2(2)-2(2) F1= ( 5) NH3 2(2)-2(2) F1= ( 1) NH3 2(2)-2(2) F1= ( 5) NH3 2(2)-2(2) F1= ( 5) NH3 2(2)-2(2) F1= ( 5) NH3 3(3)-3(3) F1= ( 5) NH3 3(3)-3(3) F1= ( 1) NH3 3(3)-3(3) F1= ( 5) NH3 3(3)-3(3) F1= ( 5) NH3 3(3)-3(3) F1= ( 2) 15NH3 6(6)-6(6) ( 2) SO2 21(5,17)-22(4,18) ( 2) SO2 8(2,6)-9(1,9) ( 1) NH3 4(4)-4(4) ( 5) NH3 10(9)-10(9) *( 8) CH3OCHO 2(0,2)-1(0,1) E *( 8) CH3OCHO 2(0,2)-1(0,1) A ( 1) OCS ( 1) NH3 5(5)-5(5) Meta-stable NH3 lines have 5 main groups of hyperfine structure components which are blended in Orion-KL spectrum

6 Line rest frequencies (cont’d) *(14) CH3OH 3(2,1)-3(1,2) E ( 2) CH3OH 4(2,2)-4(1,3) E ( 5) CH3OH 2(2,0)-2(1,1) E ( 2) CH3OH 5(2,3)-5(1,4) E ( 2) CH3OH 6(2,4)-6(1,5) E (10) NH2D 4(1,4)-4(0,4) ( 5) NH3 6(6)-6(6) ( 2) CH3OH 7(2,5)-7(1,6) E ( 2) CH3OH 8(2,6)-8(1,7) E (20) SO2 8(1,7)-7(2,6) (first detection) ( 2) CH3OH 9(2,7)-9(1,8) E ( 5) NH3 7(7)-7(7) ( 2) CH3OH 10(2,8)-10(1,9) E *( 8) CH3OCHO 2(1,1)-1(1,0) E *( 8) CH3OCHO 2(1,1)-1(1,0) A (10) CH3OH 10(1,9)-11(2,10)A (50) CH3OH 11( 2, 9)-11 (1,10) E (first detection) (10) NH3 8(8)-8(8)

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10 SO 2 J K-,K+ = 8 1,7 –7 2,6 50 km/s


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