High-resolution Near-IR Spectral Mapping with H-2 and [Fe II] Lines of Multiple Outflows around LkH alpha 234
Kaplan, Kyle F.
Sokal, Kimberly R.
Mace, Gregory N.
Jaffe, Daniel T.
AffiliationUniv Arizona, Dept Astron, Steward Observ
KeywordsISM: individual objects (LkH alpha 234, HH 167)
ISM: jets and outflows
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PublisherIOP PUBLISHING LTD
CitationHeeyoung Oh et al 2018 ApJ 858 23
Rights© 2018. The American Astronomical Society. All rights reserved.
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AbstractWe present a high-resolution, near-IR spectroscopic study of multiple outflows in the LkH alpha 234 star formation region using the Immersion GRating INfrared Spectrometer (IGRINS). Spectral mapping over the blueshifted emission of HH 167 allowed us to distinguish at least three separate, spatially overlapped outflows in H-2 and [Fe II] emission. We show that the H-2 emission represents not a single jet but rather complex multiple outflows driven by three known embedded sources: MM1, VLA 2, and VLA 3. There is a redshifted H-2 outflow at a low velocity, V-LSR < +50 km s(-1), with respect to the systemic velocity of V-LSR = -11.5 km s(-1), that coincides with the H2O masers seen in earlier radio observations 2 '' southwest of VLA 2. We found that the previously detected [Fe II] jet with vertical bar V-LSR vertical bar > 100 km s(-1) driven by VLA 3B is also detected in H-2 emission and confirm that this jet has a position angle of about 240 degrees. Spectra of the redshifted knots at 14 ''-65 '' northeast of LkH alpha 234 are presented for the first time. These spectra also provide clues to the existence of multiple outflows. We detected high-velocity (50-120 km s(-1)) H-2 gas in the multiple outflows around LkH alpha 234. Since these gases move at speeds well over the dissociation velocity (> 40 km s(-1)), the emission must originate from the jet itself rather than H-2 gas in the ambient medium. Also, position-velocity and excitation diagrams indicate that emission from knot C in HH 167 comes from two different phenomena, shocks and photodissociation.
VersionFinal published version
SponsorsUS National Science Foundation [AST-1229522]; University of Texas at Austin; Korean GMT Project of KASI; National Research Foundation of Korea (NRF) - Korean government (MSIP) [2012R1A4A1028713]