Press Release
Free Access

Table 2

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

Source Type Instrument H2O/H2 H2 from Reference
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)
L1157 B1 LM HIFI 0.008(LV) Mid-J CO Lefloch et al. (2010)
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.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.