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Table 2

Summary of H2O/H2 abundance determinations using Herschel data in warm outflows and shocks.

Source Type Instrument H2O/H2 H2 from Reference
(10−4)
On source
           
Several LM HIFI 0.02 (LV+HV) CO 16–15 (a) Kristensen et al. (2017b)
AFGL 2591 HM HIFI 0.001 CO 16–15 Kristensen (priv. comm.)
NGC 1333 IRAS 4B LM PACS 1.0 High-J CO Herczeg et al. (2012)
Serpens SMM1 LM/IM PACS 0.4 (hot) High-J CO Goicoechea et al. (2012)
NGC 7129 IRS IM HIFI/PACS 0.2–0.3 High-J CO Johnstone et al. (2010)
Fich et al. (2010)
NGC 6334I HM HIFI 0.4 Mid-J CO Emprechtinger et al. (2010)
DR21(OH) HM HIFI 0.32 (b) High-J 13CO van der Tak et al. (2010)
           
Outflow
           
L1157 B1 LM HIFI 0.008(LV) Mid-J CO Lefloch et al. (2010)
0.8(HV)
L1157 B2/R LM-OF HIFI/PACS 0.01 Warm H2 Vasta et al. (2012)
L1448 B2 LM-OF HIFI/PACS 0.03 (warm) Warm H2 Santangelo et al. (2012, 2013)
0.03–0.1 (hot) Hot H2
L1448 LM HIFI/PACS 0.005–0.01 Warm H2 Nisini et al. (2013)
VLA1623 LM-OF HIFI <0.01 (c) Warm H2 Bjerkeli et al. (2012)
Several B/R LM/IM-OF HIFI/PACS 0.003 Warm H2 Tafalla et al. (2013)
HH 54 OF HIFI <0.14 (B) Warm H2 Santangelo et al. (2014a)
L1157 B1 LM-OF HIFI/PACS 0.007–0.02 (warm) Warm H2 Busquet et al. (2014)
HIFI/PACS 1–3 (hot) Hot H2
NGC 1333 I4A R2 LM-OF HIFI/PACS 0.007-0.01 (warm) CO 16–15 (a) Santangelo et al. (2014b)
0.3–0.7 (hot)
NGC 2071 B/R IM-OF PACS 0.3–0.8 Warm H2+high − J CO Neufeld et al. (2014)
Orion-KL HM-OF PACS ≤0.01 (warm,hot) High-J CO (a) Goicoechea et al. (2015)
>2 (very hot) very high-J CO

Notes. Uncertainties claimed by the authors range are typically a factor of 2 to a few. HV = high-velocity; LV = low; B = Broad component velocity. In most cases, the abundance refers to the outflow at the central source position. B and R indicated blue- and red-shifted outflow spots (OF) offset from the source. (a) Assuming CO/H2 ≈ 10−4; if CO/H2 = 2 × 10−4 advocated in Sect. 3.1 is used, the water abundances are increased by a factor of two. (b) From para-H2O assuming ortho/para = 3. (c) Ortho-H2O abundance.

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