2010A&A...521L..36W


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST18:31:49

2010A&A...521L..36W - Astronomy and Astrophysics, volume 521, L36-36 (2010/10-1)

Herschel observations of the hydroxyl radical (OH) in young stellar objects.

WAMPFLER S.F., HERCZEG G.J., BRUDERER S., BENZ A.O., VAN DISHOECK E.F., KRISTENSEN L.E., VISSER R., DOTY S.D., MELCHIOR M., VAN KEMPEN T.A., YILDIZ U.A., DEDES C., GOICOECHEA J.R., BAUDRY A., MELNICK G., BACHILLER R., BENEDETTINI M., BERGIN E., BJERKELI P., BLAKE G.A., BONTEMPS S., BRAINE J., CASELLI P., CERNICHARO J., CODELLA C., DANIEL F., DI GIORGIO A.M., DOMINIK C., ENCRENAZ P., FICH M., FUENTE A., GIANNINI T., DE GRAAUW T., HELMICH F., HERPIN F., HOGERHEIJDE M.R., JACQ T., JOHNSTONE D., JORGENSEN J.K., LARSSON B., LIS D., LISEAU R., MARSEILLE M., McCOEY C., NEUFELD D., NISINI B., OLBERG M., PARISE B., PEARSON J.C., PLUME R., RISACHER C., SANTIAGO-GARCIA J., SARACENO P., SHIPMAN R., TAFALLA M., VAN DER TAK F.F.S., WYROWSKI F., ROELFSEMA P., JELLEMA W., DIELEMAN P., CAUX E. and STUTZKI J.

Abstract (from CDS):

``Water In Star-forming regions with Herschel'' (WISH) is a Herschel key program investigating the water chemistry in young stellar objects (YSOs) during protostellar evolution. Hydroxyl (OH) is one of the reactants in the chemical network most closely linked to the formation and destruction of H2O. High-temperature (T>250K) chemistry connects OH and H2O through the OH+H2←>H2O+H reactions. Formation of H2O from OH is efficient in the high-temperature regime found in shocks and the innermost part of protostellar envelopes. Moreover, in the presence of UV photons, OH can be produced from the photo-dissociation of H2O through H2O+γUV->OH+H. High-resolution spectroscopy of the 163.12µm triplet of OH towards HH 46 and NGC 1333 IRAS 2A was carried out with the Heterodyne Instrument for the Far Infrared (HIFI) on board the Herschel Space Observatory. The low- and intermediate-mass protostars HH 46, TMR 1, IRAS 15398-3359, DK Cha, NGC 7129 FIRS 2, and NGC 1333 IRAS 2A were observed with the Photodetector Array Camera and Spectrometer (PACS) on Herschel in four transitions of OH and two [OI] lines. The OH transitions at 79, 84, 119, and 163µm and [OI] emission at 63 and 145µm were detected with PACS towards the class I low-mass YSOs as well as the intermediate-mass and class I Herbig Ae sources. No OH emission was detected from the class 0 YSO NGC 1333 IRAS 2A, though the 119µm was detected in absorption. With HIFI, the 163.12µm was not detected from HH 46 and only tentatively detected from NGC 1333 IRAS 2A. The combination of the PACS and HIFI results for HH 46 constrains the line width (FWHM>11km/s) and indicates that the OH emission likely originates from shocked gas. This scenario is supported by trends of the OH flux increasing with the [OI] flux and the bolometric luminosity, as found in our sample. Similar OH line ratios for most sources suggest that OH has comparable excitation temperatures despite the different physical properties of the sources.

Abstract Copyright:

Journal keyword(s): astrochemistry - stars: formation - ISM: molecules - ISM: jets and outflows - ISM: individual objects: HH 46

Simbad objects: 13

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Number of rows : 13

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 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 392 3
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 599 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 465 0
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 555 0
5 IRAS 04361+2547 Y*O 04 39 13.89767 +25 53 20.6340           ~ 185 1
6 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 298 1
7 V* DK Cha Or* 12 53 17.2028372976 -77 07 10.727661977           F0 132 0
8 Barnard 228 cor 15 43 00.9 -34 08 48           ~ 64 0
9 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 129 0
10 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1920 1
11 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 236 2
12 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 234 0
13 NAME NGC 7129 FIR 2 IR 21 44 01.5 +66 03 40           ~ 84 0

    Equat.    Gal    SGal    Ecl

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2020.08.08-18:31:49

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