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Table 3

H2O line equivalent widths, fluxes, and velocity shifts.

NGC 4418 Arp 220
Line λ W eq a fluxa V shifta,b W eq a fluxa V shifta,b
(μm) (km s-1) (10-21 W cm-2) (km   s-1) (km   s-1) (10-21 W cm-2) (km   s-1)

H2O 533 → 422 53.138 24.9(6.5) −20.0(5.2) 35(29) 1.9(2.6) −4.5(6.3)
H2O 827 → 716c 55.131 6.2(2.3) −4.8(1.8) −3(16)
H2O 431 → 322 56.325 35.6(1.8) −26.6(1.4) −8(33) 30.0(1.2) −65.3(2.6) −29(49)
H2O 422 → 313 57.636 37.1(2.1) −28.0(1.5) −15(35) 22.8(1.3) −49.3(2.8) 14(43)
H2O 432 → 321 58.699 50.7(0.9) −37.8(0.7) 16(34) 34.7(1.0) −74.9(2.1) −87(47)
H2O 726 → 615c 59.987 5.6(1.3) −4.1(1.0) −6(22)
H2O 431 → 404 61.809 11.1(2.6) −7.3(1.7) 37(24) 2.3(1.4) −4.9(3.0)
H2O 818 → 707 63.324 13.3(1.0) −9.1(0.7) 33(18) 2.4(0.6) −5.1(1.3)
H2O 716 → 625 66.093 11.8(0.9) −7.5(0.6) −6(24) 5.7(1.0) −12.3(2.1)
H2O 330 → 221 66.438 64.7(1.3) −41.8(0.9) −18(34) 40.8(0.8) −87.8(1.8) −55(38)
H2O 331 → 220 67.089 43.6(2.2) −28.1(1.4) 12(31) 41.6(0.9) −90.4(2.1) −30(49)
H2O 330 → 303 67.269 13.2(1.3) −8.5(0.8) −9(29) 7.7(2.3) −16.7(4.9) −24(51)
H2O 524 → 413 71.067 23.9(1.7) −13.6(1.0) −45(24) 16.7(1.0) −33.2(2.0) 35(44)
H2O 717 → 606 71.540 17.6(1.8) −9.7(1.0) 27(34) 9.5(0.8) −19.0(1.6)
H2O 707 → 616 71.947 25.5(2.3) −13.8(1.2) −11(32) 10.0(0.8) −20.1(1.7) 35(38)
H2O 725 → 634c 74.945 5.0(1.5) −2.6(0.8) −15(23)
H2O 321 → 212 75.381 73.9(1.1) −38.6(0.6) −23(32) 79.7(0.8) −153.4(1.6) 4(41)
H2O 423 → 312 78.742 40.3(1.9) −19.1(0.9) −36(27) 34.4(0.9) −62.9(1.6) −42(43)
H2O 615 → 524 78.928 19.4(1.8) −9.3(0.9) −4(27) 4.9(0.8) −8.8(1.4) −70(31)
H2O 616 → 505 82.031 31.4(1.4) −14.1(0.6) 2(25) 20.3(0.6) −35.6(1.1) −21(37)
H2O 606 → 515 83.284 25.1(1.7) −11.3(0.7) −16(27) 16.1(1.2) −27.5(2.0) −4(41)
H2O 322 → 211 89.988 60.4(1.7) −23.3(0.7) 5(27) 39.8(1.1) −60.6(1.6) −32(35)
H2O 643 → 634c 92.811 8.0(1.6) −3.0(0.6) −35(19)
H2O 625 → 616 94.644 10.1(1.7) −3.6(0.6) −37(17)
H2O 441 → 432 94.705 14.3(1.8) −5.1(0.6) −33(18)
H2O 515 → 404 95.627 42.9(2.4) −15.2(0.8) −11(30) 22.8(2.1) −31.6(2.9) 9(41)
H2O 440 → 431 95.885 12.5(2.0) −4.3(0.7) −2(20) 3.0(1.7) −4.1(2.3)
H2O 615 → 606d 103.940 10.0(1.4) −2.9(0.4) 68(29) 7.6(1.4) −9.5(1.7) −34(42)
H2O 221 → 110 108.073 67.4(2.6) −17.5(0.7) −23(46) 72.2(2.1) −82.9(2.4) 40(47)
H2O 524 → 515 111.628 24.8(2.2) −6.1(0.5) 42(55) 4.2(0.7) −4.5(0.8)
H2O 414 → 303 113.537 36.7(2.1) −8.5(0.5) 14(39) 26.0(2.9) −27.0(3.1) −32(44)
H2O 404 → 313 125.354 25.4(1.8) −4.6(0.3) −19(33) 27.7(1.2) −23.7(1.0) −6(54)
H2O 331 → 322d 126.714 12.0(1.8) −2.1(0.3) 55(35) 8.8(5.3) −7.4(4.4) 14(119)
H2O 423 → 414 132.408 28.1(2.5) −4.6(0.4) 5(68) 12.6(0.8) −9.7(0.6) −29(46)
H2O 514 → 505 134.935 26.1(1.9) −4.1(0.3) 0(49) 8.6(0.8) −6.3(0.6) 18(40)
H2O 330 → 321 136.496 36.9(1.9) −5.5(0.3) 0(46) 19.8(0.8) −14.3(0.6) −37(48)
H2O 313 → 202 138.528 30.7(1.4) −4.5(0.2) 30(39) 29.0(1.2) −20.2(0.8) −40(45)
H2O 413 → 322 144.518 11.9(1.7) −1.5(0.2) −32(28) 11.6(0.9) −7.3(0.6) −24(40)
H2O 431 → 422 146.923 12.2(2.1) −1.5(0.3) −17(33) 3.3(0.6) −2.0(0.3) −23(27)
H2O 322 → 313 156.194 9.2(2.3) −1.0(0.2) 30(26) 14.5(0.9) −7.5(0.5) −29(38)
H2O 303 → 212 174.626 13.2(2.5) −1.0(0.2) −7(15) 20.3(3.7) −7.3(1.3) −33(26)
H2O 212 → 101d 179.527 81.9(4.9) −5.5(0.3) 118(35) 167.3(5.1) −51.5(1.6) 34(40)

Notes. 

(a)

Numbers in parenthesis indicate 1σ uncertainties from Gaussian fits to the lines.

(b)

Velocity shifts are relative to z = 0.00705 for NGC 4418 and z = 0.0181 for Arp 220.

(c)

Marginal detection.

(d)

Probably contaminated.

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