Universität zu Köln

Neufeld, David A., Gusdorf, Antoine, Guesten, Rolf, Herczeg, Greg J., Kristensen, Lars, Melnick, Gary J., Nisini, Brunella ORCID: 0000-0002-9190-0113, Ossenkopf, Volker, Tafalla, Mario ORCID: 0000-0002-2569-1253 and van Dishoeck, Ewine F. (2014). THE WATER ABUNDANCE BEHIND INTERSTELLAR SHOCKS: RESULTS FROM HERSCHEL/PACS AND SPITZER/IRS OBSERVATIONS OF H(2)0, CO, AND H-2. Astrophys. J., 781 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We have investigated the water abundance in shock-heated molecular gas, making use of Herschel measurements of far-infrared (IR) CO and H2O line emissions in combination with Spitzer measurements of mid-IR H-2 rotational emissions. We present far-IR line spectra obtained with Herschel's Photodetector Array Camera and Spectrometer instrument in range spectroscopy mode toward two positions in the protostellar outflow NGC 2071 and one position each in the supernova remnants W28 and 3C391. These spectra provide unequivocal detections, at one or more positions, of 12 rotational lines of water, 14 rotational lines of CO, 8 rotational lines of OH (4 lambda doublets), and 7 fine-structure transitions of atoms or atomic ions. We first used a simultaneous fit to the CO line fluxes, along with H2 rotational line fluxes measured previously by Spitzer, to constrain the temperature and density distribution within the emitting gas; we then investigated the water abundances implied by the observed H(2)0 line fluxes. The water line fluxes are in acceptable agreement with standard theoretical models for nondissociative shocks that predict the complete vaporization of grain mantles in shocks of velocity v similar to 25 km s(-1), behind which the characteristic gas temperature is similar to 1300 K and the H(2)0/CO ratio is 1.2

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Neufeld, David A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gusdorf, Antoine UNSPECIFIED UNSPECIFIED UNSPECIFIED Guesten, Rolf UNSPECIFIED UNSPECIFIED UNSPECIFIED Herczeg, Greg J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kristensen, Lars UNSPECIFIED UNSPECIFIED UNSPECIFIED Melnick, Gary J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nisini, Brunella UNSPECIFIED orcid.org/0000-0002-9190-0113 UNSPECIFIED Ossenkopf, Volker UNSPECIFIED UNSPECIFIED UNSPECIFIED Tafalla, Mario UNSPECIFIED orcid.org/0000-0002-2569-1253 UNSPECIFIED van Dishoeck, Ewine F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-446971
DOI:	10.1088/0004-637X/781/2/102
Journal or Publication Title:	Astrophys. J.
Volume:	781
Number:	2
Date:	2014
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SUPERNOVA-REMNANTS; MAGNETOHYDRODYNAMIC SHOCKS; MOLECULAR GAS; BASIC DATA; OH MASERS; EMISSION; EXCITATION; WAVES; ASTRONOMY; CHEMISTRY Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44697