IGRINS NEAR-IR HIGH-RESOLUTION SPECTROSCOPY OF MULTIPLE JETS AROUND LkHα  234*

Oh, Hyun-Mee; Pyo, Tae‐Soo; Yuk, I. S.; Park, Byeong Gon; Park, Chan; Chun, Moo Young; Pak, Soojong; Kim, Kang Min; Oh, Jae Sok; Jeong, Ueejeong; Yu, Young Sam; Lee, Jae Joon; Kim, Hwi; Hwang, Narae; Kaplan, Kyle; Pavel, M.; Mace, Gregory N.; Lee, Hyein; Le, Huynh Anh N.; Lee, Sungho; Jaffe, D. T.

doi:10.3847/0004-637x/817/2/148

Cited by 11 publications

(6 citation statements)

References 55 publications

(97 reference statements)

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“…In the high-velocity regions, T rot at v = 1 is similar to that at the systemic velocity, while T rot at v = 2 and 3 show various values among 2000−3000 K with larger uncertainty (> 400 K). The estimated T rot are similar to those from other shocked outflows in low-or intermediate-mass star formation region (Nisini et al 2002;Takami et al 2006;Oh et al 2016). In Section 4, we discuss the further interpretation of line ratios in relation to the various shock models.…”

Section: Shock Condition and Population Diagramsupporting

confidence: 62%

Three-Dimensional Shock Structure of the Orion Kl Outflow With Igrins*

Pyo

Kaplan

et al. 2016

ApJ

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We report a study of the three-dimensional (3D) outflow structure of a 15 ′′ × 13 ′′ area around H 2 peak 1 in Orion KL with slit-scan observations (13 slits) using the Immersion Grating Infrared Spectrograph. The datacubes, with high velocity-resolution (∼ 7.5 km s −1 ) provide high contrast imaging within ultranarrow bands, and enable the detection of the main stream of the previously reported H 2 outflow fingers. We identified 31 distinct fingers in H 2 1−0 S(1) λ2.122 µm emission. The line profile at each finger shows multiple-velocity peaks with a strong low-velocity component around the systemic velocity at V LSR = +8 km s −1 and high velocity emission (|V LSR | = 45−135 km s −1 ) indicating a typical bow-shock. The observed radial velocity gradients of ∼ 4 km s

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Section: Shock Condition and Population Diagramsupporting

confidence: 62%

Three-Dimensional Shock Structure of the Orion Kl Outflow With Igrins*

Pyo

Kaplan

et al. 2016

ApJ

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“…In Figure 12(b), H 2 /Fe knot A shows a velocity structure in which the H 2 peak is coincident with the lowest blueshift boundary of the low-blueshift [Fe II] component. This is the velocity structure that is expected from the ambient H 2 gas entrained by the [Fe II] outflow shock (e.g., Davis et al 2001;Pyo et al 2002;Davis et al 2003;Oh et al 2016b). Therefore, H 2 knot A (both the narrow and broad components), associated with the low-blueshift component of Fe knot A, is likely molecular gas entrained by the shocks propagating in the bow wing regions of "Outflow A."…”

Section: Shock-induced [Fe Ii] Sourcesmentioning

confidence: 82%

“…However, its peak location (at V −20 km s −1 ) is much closer to YSO 2, suggesting its association with YSO 2, rather than with H 2 knot B. It has been observed in the outflows of young stars that the H 2 emission is found in relatively low-velocity ranges while the [Fe II] emission is found in higher velocity ranges (e.g., Pyo et al 2002;Davis et al 2003;Takami et al 2006;Oh et al 2016b). It has been interpreted that the [Fe II] and H 2 emissions, respectively, originate from high-velocity collimated outflows and low-velocity entrained ambient molecular gas.…”

Section: Shock-induced [Fe Ii] Sourcesmentioning

confidence: 97%

High-resolution Near-infrared Spectroscopy of Diffuse Sources around MWC 1080

Kim,

Oh,

Jeong

et al. 2021

Preprint

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To reveal the origins of diffuse Hα emissions observed around the Herbig star MWC 1080, we have performed a high-resolution near-infrared (NIR) spectroscopic observation using the Immersion GRating INfrared Spectrograph (IGRINS). In the NIR H and K bands, we detected various emission lines (six hydrogen Brackett lines, seven H 2 lines, and an [Fe II] line) and compared their spatial locations with the optical (Hα and [S II]) and radio ( 13 CO and CS) line maps. The shock-induced H 2 and [Fe II] lines indicate the presence of multiple outflows, consisting of at least three, associated young stars in this region. The kinematics of H 2 and [Fe II] near the northeast (NE) cavity edge supports that the NE main outflow from MWC 1080A is the blueshifted one with a low inclination angle. The H 2 and [Fe II] lines near the southeast molecular region newly reveal that additional highly-blueshifted outflows originate from other young stars. The fluorescent H 2 lines were found to trace photodissociation regions formed on the cylindrical surfaces of the main outflow cavity, which are expanding outward with a velocity of about 10-15 km s −1 . For the Hα emission, we identify its components associated with two stellar outflows and two young stars in addition to the dominant component of MWC 1080A scattered by dust. We also report a few faint Hα features located ∼0.4 pc away in the southwest direction from MWC 1080A, which lie near the axes of the NE main outflow and one of the newly-identified outflows.

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“…Only the pixels where both lines were fitted with a Gaussian profile with a S /N > 3 are considered for this analysis. Typically, 1 − 0 S(1)/2 − 1 S(1) ratios larger than 3 indicate shocked emis- All of the knots show ratios between 8 and 12 which are values consistent with shocked emission (see also Oh et al 2016;Wolf-Chase et al 2017). We note that this ratio by itself is not sufficient to categorise the emission as definitely shock driven.…”

Section: Excitation Mapsmentioning

confidence: 85%

NIR jets from a clustered region of massive star formation: Morphology and composition in the IRAS 18264-1152 region

Silva,

Fedriani,

Tan

et al. 2021

Preprint

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Context. Massive stars play crucial roles in determining the physical and chemical evolution of galaxies. However they form deeply embedded in their parental clouds, making it challenging to directly observe these stars and their immediate environments. It is known that accretion and ejection processes are intrinsically related, thus observing the massive protostellar outflows can provide crucial information about the processes governing massive star formation very close to the central engine. Aims. We aim to probe the IRAS 18264−1152 (also known as G19.88-0.53) high-mass star-forming complex in the near infrared (NIR) through its molecular hydrogen (H 2 ) jets to analyse the morphology and composition of the line emitting regions and to compare with other outflow tracers. Methods. We observed the H 2 NIR jets via K-band (1.9 µm -2.5 µm) observations obtained with the integral field units VLT/SINFONI and VLT/KMOS. VLT/SINFONI provides the highest NIR angular resolution achieved so far for the central region of IRAS 18264−1152 (∼ 0.2 ). We compared the geometry of the NIR outflows with that of the associated molecular outflow, probed by CO (2−1) emission mapped with the Submillimeter Array. Results. We identify nine point sources in the SINFONI and KMOS fields of view. Four of these display a rising continuum in the K-band and are Brγ emitters, revealing that they are young, potentially jet-driving sources. The spectro-imaging analysis focusses on the H 2 jets, for which we derived visual extinction, temperature, column density, area, and mass. The intensity, velocity, and excitation maps based on H 2 emission strongly support the existence of a protostellar cluster in this region, with at least two (and up to four) different large-scale outflows, found through the NIR and radio observations. We compare our results with those found in the literature and find good agreement in the outflow morphology. This multi-wavelength comparison also allows us to derive a stellar density of ∼ 4000 stars pc −3 . Conclusions. Our study reveals the presence of several outflows driven by young sources from a forming cluster of young, massive stars, demonstrating the utility of such NIR observations for characterising massive star-forming regions. Moreover, the derived stellar number density together with the geometry of the outflows suggest that stars can form in a relatively ordered manner in this cluster.

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IGRINS NEAR-IR HIGH-RESOLUTION SPECTROSCOPY OF MULTIPLE JETS AROUND LkHα 234*

Cited by 11 publications

References 55 publications

Three-Dimensional Shock Structure of the Orion Kl Outflow With Igrins*

Three-Dimensional Shock Structure of the Orion Kl Outflow With Igrins*

High-resolution Near-infrared Spectroscopy of Diffuse Sources around MWC 1080

NIR jets from a clustered region of massive star formation: Morphology and composition in the IRAS 18264-1152 region

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