2008ApJ...674.1015F


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST14:42:30

2008ApJ...674.1015F - Astrophys. J., 674, 1015-1031 (2008/February-3)

SWAS observations of water in molecular outflows.

FRANKLIN J., SNELL R.L., KAUFMAN M.J., MELNICK G.J., NEUFELD D.A., HOLLENBACH D.J. and BERGIN E.A.

Abstract (from CDS):

We present detections of the ground-state 110⟶101 transition of ortho-H2 O at 557 GHz in 18 molecular outflows based on data from the Submillimeter Wave Astronomy Satellite (SWAS). These results are combined with ground-based observations of the J=1-0 transitions of 12CO and 13CO obtained at the Five College Radio Astronomy Observatory (FCRAO). Data from Infrared Space Observatory (ISO) for a subset of the outflows are also discussed. Assuming that the SWAS water-line emission originates from the same gas traced by CO emission, we find that the outflowing gas in most outflows has an ortho-H2 O abundance relative to H2of between ∼10–7 and 10–6. Analysis of the water abundance as a function of outflow velocity reveals a strong dependence. The abundance of ortho-H2 O increases with velocity, and at the highest outflow velocities some of the outflows have relative ortho-H2 O abundances of order 10–4. However, the mass of very high velocity gas with such elevated H2 O abundances represents less than 1% of the total outflow gas mass. The ISO LWS observations of high-J rotational lines of CO and the 179.5 µm transition of ortho-H2 O provide evidence for a warmer outflow component than required to produce either the SWAS or FCRAO lines. The ISO line-flux ratios can be reproduced with C-shock models with shock velocities of order 25 km/s and preshock densities of order 105/cm3; these C-shocks have postshock relative water abundances greater than 10–4. The mass associated with the ISO emission is also quite small compared with the total outflow mass and is similar to that responsible for the highest velocity water emission detected by SWAS. Although the gas responsible for the ISO emission has elevated levels of water, the bulk of the outflowing gas has an abundance of ortho-H2O well below what would be expected if the gas has passed through a C-shock with shock velocities greater than 10 km/s. Gas-phase water can be depleted in the postshock gas due to freezeout onto grain mantles; however, the rate of freezeout is too slow to explain our results. Therefore, we believe that only a small fraction of the outflowing molecular gas has passed through shocks strong enough to fully convert the gas-phase oxygen to water. This result has implications for the acceleration mechanism of the molecular gas in these outflows.

Abstract Copyright:

Journal keyword(s): ISM: Abundances - ISM: Jets and Outflows - ISM: Molecules - Stars: Formation - Stars: Winds, Outflows

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LDN 1448 DNe 03 22.5 +30 35           ~ 480 0
2 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 315 0
3 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 245 1
4 RAFGL 490 Y*O 03 27 38.7928323987 +58 47 00.017662871           ~ 341 0
5 V* V512 Per Or* 03 29 03.7567945196 +31 16 03.959183877           ~ 359 0
6 2MASS J03290842+3115284 NIR 03 29 08.420 +31 15 28.48           ~ 226 1
7 LZK 12 Y*O 03 29 10.4138336046 +31 21 59.070333199   16.06 14.25     B5:V+F2: 130 0
8 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1261 1
9 V* V2254 Ori Or* 05 35 14.11296 -05 22 22.7316           B 298 2
10 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2074 1
11 OMC 2 MoC 05 35 27 -05 10.1           ~ 405 1
12 HH 25 HH 05 46 06 -00 13.4           ~ 71 0
13 NAME HH 25MMS Y*O 05 46 07.8 -00 13 41           ~ 56 0
14 NGC 2071 RNe 05 47 10 +00 18.0           ~ 616 1
15 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 667 2
16 NAME Mon OB1 D PoC 06 41 09.9 +09 34 34           ~ 54 1
17 NAME Mon OB1 C PoC 06 41 11 +09 29.1           ~ 50 1
18 * rho Oph A * 16 25 35.1182364594 -23 26 49.827436721 4.3 5.22 5.05     B2/3V 399 0
19 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 382 0
20 [SSG2006] MMS002 smm 16 26 26.50 -24 24 30.9           ~ 241 0
21 LDN 1689N DNe 16 32 25.96 -24 28 46.2           ~ 110 0
22 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 243 2
23 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 508 0
24 IRAS 20582+7724 Y*O 20 57 12.9187221407 +77 35 43.655738044           ~ 113 0
25 LDN 1228 DNe 20 57 13 +77 35.8           ~ 122 0
26 NAME IC 1396 North CGb 21 40 42.6537 +58 16 01.882           ~ 182 1
27 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 638 2
28 IRAS 22176+6303 Y*O 22 19 17.978 +63 18 52.92           ~ 590 0
29 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 202 0
30 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 708 2

    Equat.    Gal    SGal    Ecl

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2021.05.16-14:42:30

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