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Orion-KL EVLA spectrum Karl Menten, Dec. 28, 2010

Orion-KL EVLA spectrum Karl Menten, Dec. 28, 2010 Received spectra from R. Perley on Dec. 23 and 28, 2010 Frequency range 23654.50–24654.37 MHz

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Orion-KL EVLA spectrum Karl Menten, Dec. 28, 2010

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  1. Orion-KL EVLA spectrum • Karl Menten, Dec. 28, 2010 • Received spectra from R. Perley on Dec. 23 and 28, 2010 • Frequency range 23654.50–24654.37 MHz • Subtracted 2.2586 MHz to frequencies so that NH3 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) • 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”(insh) lines • 29 previously detected in ISM, listed on Lovas’ website: • http://physics.nist.gov/PhysRefData/Micro/Html/contents.html • Dominated by lines from ammonia (NH3) and methanol (CH3OH) • Two E/A doublets of methyl formate CH3CHO • OCS 2-1 • ~3 unidentified lines above 5 cal. units • There certainly are (unidentified, but possiby identifiable) weaker lines in the spectrum

  3. Ammonia (NH3) • 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 15NH3 isotopologue, [14N/15N]≈250 • (weak) 4(1,4)-4(0,4) line from singly deuterated ammonia, NH2D

  4. Methanol (CH3OH) • ten strong maser lines from Jk=2-Jk=1E-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 15NH3 isotopologue, [14N/15N]≈250 • (weak) 4(1,4)-4(0,4) line from singly deuterated ammonia, NH2D

  5. Line rest frequencies 23657.471 ( 5) NH3 9(8)-9(8) 23693.9051( 1) NH3 1(1)-1(1) F,F1=3/2,1-5/2,2 23694.4700( 1) NH3 1(1)-1(1) F,F1=1/2,1-3/2,1 23694.5060( 1) NH3 1(1)-1(1) F,F1=5/2,2-5/2,2 23695.0672( 1) NH3 1(1)-1(1) F,F1=3/2,2-3/2,1 23696.0297( 2) NH3 1(1)-1(1) F,F1=1/2,0-1/2,1 23720.575 ( 5) NH3 2(2)-2(2) F1=1-2 23721.336 ( 5) NH3 2(2)-2(2) F1=3-2 23722.6336( 1) NH3 2(2)-2(2) F1=3-3 23723.929 ( 5) NH3 2(2)-2(2) F1=2-3 23724.691 ( 5) NH3 2(2)-2(2) F1=2-1 23867.805 ( 5) NH3 3(3)-3(3) F1=2-3 23868.450 ( 5) NH3 3(3)-3(3) F1=4-3 23870.1296( 1) NH3 3(3)-3(3) F1=4-4 23871.807 ( 5) NH3 3(3)-3(3) F1=3-4 23872.453 ( 5) NH3 3(3)-3(3) F1=3-2 23922.3132( 2) 15NH3 6(6)-6(6) 24039.8 Unidentified 24083.4 Unidentified 24139.4169( 1) NH3 4(4)-4(4) 24205.287 ( 5) NH3 10(9)-10(9) 24296.491*( 8) CH3OCHO 2(0,2)-1(0,1) E 24298.481*( 8) CH3OCHO 2(0,2)-1(0,1) A 24325.927 ( 1) OCS 2-1 24532.9887( 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) 24928.715*(14) CH3OH 3(2,1)-3(1,2) E 24933.468 ( 2) CH3OH 4(2,2)-4(1,3) E 24934.382 ( 5) CH3OH 2(2,0)-2(1,1) E 24959.079 ( 2) CH3OH 5(2,3)-5(1,4) E 25018.123 ( 2) CH3OH 6(2,4)-6(1,5) E 25023.792 (10) NH2D 4(1,4)-4(0,4) 25056.025 ( 5) NH3 6(6)-6(6) 25124.872 ( 2) CH3OH 7(2,5)-7(1,6) E 25294.417 ( 2) CH3OH 8(2,6)-8(1,7) E 25392.776 (20) SO2 8(1,7)-7(2,6) (first detection) 25541.398 ( 2) CH3OH 9(2,7)-9(1,8) E 25715.182 ( 5) NH3 7(7)-7(7) 25878.266 ( 2) CH3OH 10(2,8)-10(1,9) E 26044.796*( 8) CH3OCHO 2(1,1)-1(1,0) E 26048.534*( 8) CH3OCHO 2(1,1)-1(1,0) A 26120.584 (10) CH3OH 10(1,9)-11(2,10)A- 26313.124 (50) CH3OH 11( 2, 9)-11 (1,10) E (first detection) 26518.981 (10) NH3 8(8)-8(8)

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