2015ApJ...799..102G


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.21CET11:38:43

2015ApJ...799..102G - Astrophys. J., 799, 102 (2015/January-3)

Herschel far-infrared spectral-mapping of Orion BN/KL outflows: spatial distribution of excited CO, H2O, OH, O, and c+ in shocked gas.

GOICOECHEA J.R., CHAVARRIA L., CERNICHARO J., NEUFELD D.A., VAVREK R., BERGIN E.A., CUADRADO S., ENCRENAZ P., ETXALUZE M., MELNICK G.J. and POLEHAMPTON E.

Abstract (from CDS):

We present ∼2'x2' spectral-maps of Orion Becklin-Neugebauer/Kleinmann-Low (BN/KL) outflows taken with Herschel at ∼12'' resolution. For the first time in the far-IR domain, we spatially resolve the emission associated with the bright H2 shocked regions "Peak 1" and "Peak 2" from that of the hot core and ambient cloud. We analyze the ∼54-310 µm spectra taken with the PACS and SPIRE spectrometers. More than 100 lines are detected, most of them rotationally excited lines of 12CO (up to J = 48-47), H2O, OH, 13CO, and HCN. Peaks 1/2 are characterized by a very high L(CO)/LFIR~ 5x10–3 ratio and a plethora of far-IR H2O emission lines. The high-J CO and OH lines are a factor of ~2 brighter toward Peak 1 whereas several excited H2O lines are ≲ 50% brighter toward Peak 2. Most of the CO column density arises from Tk∼ 200-500 K gas that we associate with low-velocity shocks that fail to sputter grain ice mantles and show a maximum gas-phase H2O/CO ≲ 10–2 abundance ratio. In addition, the very excited CO (J > 35) and H2 O lines reveal a hotter gas component (Tk∼ 2500 K) from faster (vS> 25 km/s) shocks that are able to sputter the frozen-out H2O and lead to high H2O/CO ≳ 1 abundance ratios. The H2O and OH luminosities cannot be reproduced by shock models that assume high (undepleted) abundances of atomic oxygen in the preshock gas and/or neglect the presence of UV radiation in the postshock gas. Although massive outflows are a common feature in other massive star-forming cores, Orion BN/KL seems more peculiar because of its higher molecular luminosities and strong outflows caused by a recent explosive event.

Abstract Copyright:

Journal keyword(s): infrared: ISM - ISM: jets and outflows - shock waves - stars: protostars

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 IRS 5 Cluster Cl* 02 25 42 +62 06.1           ~ 71 1
2 NAME Orion Peak 1 PoC 05 35 13.57 -05 22 03.8           ~ 30 0
3 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1001 2
4 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1968 1
5 NAME Ori N Y*O 05 35 14.35371 -05 22 32.8820           ~ 101 0
6 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 174 0
7 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 565 1
8 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1445 1
9 M 42 HII 05 35 17.3 -05 23 28           ~ 3684 0
10 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 702 0
11 NGC 2071 RNe 05 47 10 +00 18.0           ~ 606 1
12 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 262 0
13 SNR G006.4-00.1 SNR 18 01 22.7 -23 17 20           ~ 637 1
14 W 33a Y*O 18 14 39.0 -17 52 03           ~ 575 0
15 3C 391.0 Rad 18 49 23.3 -00 55 38           ~ 314 2
16 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 456 0
17 W 49n HII 19 10 13.2 +09 06 12           ~ 406 3
18 IRAS 19081+0903 HII 19 10 34.0 +09 08 01           ~ 23 0
19 GAL 049.5-00.4 MoC 19 23 44 +14 30.7           ~ 22 0
20 W 51 SNR 19 23 50 +14 06.0           ~ 1130 1
21 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 360 0

    Equat.    Gal    SGal    Ecl

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2020.02.21-11:38:43

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