SOFIA/EXES Observations of Water Absorption in the Protostar AFGL 2591 At High Spectral Resolution

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dc.contributor.utaustinauthorJaffe, D. T.en_US
dc.creatorIndriolo, Nicken_US
dc.creatorNeufeld, D. A.en_US
dc.creatorDeWitt, C. N.en_US
dc.creatorRichter, Matthew J.en_US
dc.creatorBoogert, A. C. A.en_US
dc.creatorHarper, G. M.en_US
dc.creatorJaffe, D. T.en_US
dc.creatorKulas, K. R.en_US
dc.creatorMcKelvey, M. E.en_US
dc.creatorRyde, N.en_US
dc.creatorVacca, W.en_US
dc.date.accessioned2016-10-28T19:36:11Z
dc.date.available2016-10-28T19:36:11Z
dc.date.issued2015-04en_US
dc.description.abstractWe present high spectral resolution (similar to 3 km s(-1)) observations of the nu(2) ro-vibrational band of H2O in the 6.086-6.135 mu m range toward the massive protostar AFGL 2591 using the Echelon-Cross-Echelle Spectrograph (EXES) on the Stratospheric Observatory for Infrared Astronomy (SOFIA). Ten absorption features are detected in total, with seven caused by transitions in the nu(2) band of H2O, two by transitions in the first vibrationally excited nu(2) band of H2O, and one by a transition in the nu(2) band of (H2O)-O-18. Among the detected transitions is the nu(2) 1(1,1)-0(0,0) line that probes the lowest-lying rotational level of para-H2O. The stronger transitions appear to be optically thick, but reach maximum absorption at a depth of about 25%, suggesting that the background source is only partially covered by the absorbing gas or that the absorption arises within the 6 mu m emitting photosphere. Assuming a covering fraction of 25%, the H2O column density and rotational temperature that best fit the observed absorption lines are N(H2O) = (1.3 +/- 0.3) x 10(19) cm(-2) and T = 640 +/- 80 K.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipUCD NNX13AI85Aen_US
dc.description.sponsorshipNASA Ames NNX13AI85Aen_US
dc.identifierdoi:10.15781/T2VD6P72M
dc.identifier.citationIndriolo, Nick, D. A. Neufeld, C. N. DeWitt, M. J. Richter, A. C. A. Boogert, G. M. Harper, D. T. Jaffe et al. "SOFIA/EXES Observations of Water Absorption in the Protostar AFGL 2591 at High Spectral Resolution." The Astrophysical Journal Letters, Vol. 802, No. 2 (Apr., 2015): L14.en_US
dc.identifier.doi10.1088/2041-8205/802/2/l14en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43007
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectstars: protostarsen_US
dc.subjectstar-forming regionsen_US
dc.subjectprotoplanetary disksen_US
dc.subjecthydrogen-fluorideen_US
dc.subjectherschelen_US
dc.subjectgasen_US
dc.subjecth2oen_US
dc.subjectastronomyen_US
dc.subjectspectrographen_US
dc.subjectinstrumenten_US
dc.subjectscienceen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleSOFIA/EXES Observations of Water Absorption in the Protostar AFGL 2591 At High Spectral Resolutionen_US
dc.typeArticleen_US

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