High-resolution Near-IR Spectral Mapping with H-2 and [Fe II] Lines of Multiple Outflows around LkH alpha 234
Name:
Oh_2018_ApJ_858_23.pdf
Size:
3.703Mb
Format:
PDF
Description:
Final Published version
Author
Oh, HeeyoungPyo, Tae-Soo
Koo, Bon-Chul
Yuk, In-Soo
Kaplan, Kyle F.
Lee, Yong-Hyun
Sokal, Kimberly R.
Mace, Gregory N.
Park, Chan
Lee, Jae-Joon
Park, Byeong-Gon
Hwang, Narae
Kim, Hwihyun
Jaffe, Daniel T.
Affiliation
Univ Arizona, Dept Astron, Steward ObservIssue Date
2018-05Keywords
ISM: individual objects (LkH alpha 234, HH 167)ISM: jets and outflows
ISM: molecules
stars: formation
techniques: spectroscopic
Metadata
Show full item recordPublisher
IOP PUBLISHING LTDCitation
Heeyoung Oh et al 2018 ApJ 858 23Journal
ASTROPHYSICAL JOURNALRights
© 2018. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We 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.ISSN
1538-4357Version
Final published versionSponsors
US 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]Additional Links
http://stacks.iop.org/0004-637X/858/i=1/a=23?key=crossref.47895c23921a0f1922e84fbf131cb50eae974a485f413a2113503eed53cd6c53
10.3847/1538-4357/aabba4