Three-dimensional geometry and dust/gas ratios in massive star-forming regions over the entire LMC as revealed by the IRSF/SIRIUS survey

Furuta T, Kaneda H, Kokusho T, Nakajima Y, Fukui Y, Tsuge K (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Publications of the Astronomical Society of Japan Universal Academy Press, Inc.

DOI: 10.1093/pasj/psac025

Abstract

We derive the entire dust extinction (A(V)) map for the Large Magellanic Cloud (LMC) estimated from the color excess at near-infrared wavelengths. Using the percentile method we recently adopted to evaluate A(V) distribution along the line of sight, we derive three-dimensional (3D) A(V) maps of the three massive star-forming regions of N44, N79, and N11 based on the IRSF/SIRIUS point source catalog. The 3D A(V) maps are compared with the hydrogen column densities N(H) of three different velocity components where one is of the LMC disk velocity and the other two are of velocities lower than the disk velocity. As a result, we obtain a 3D dust geometry suggesting that gas collision is ongoing between the different velocity components. We also find differences in the timing of the gas collision between the massive star-forming regions, which indicates that the gas collision in N44, N79, and N11 occurred later than that in 30 Doradus. In addition, a difference of a factor of two in A(V)/N(H) is found between the velocity components for N44, while a significant difference is not found for N79 and N11. From the 3D geometry and A(V)/N(H) in each star-forming region, we suggest that the massive star formation in N44 was induced by an external trigger of tidal interaction between the LMC and the Small Magellanic Cloud, while that in N79 and N11 is likely to have been induced by internal triggers such as gas converging from the galactic spiral arm and expansion of a supershell, although the possibility of tidal interaction cannot be ruled out.

Authors with CRIS profile

Kisetsu Tsuge Professur für Multiwellenlängenastronomie

Involved external institutions

Nagoya University / 名古屋大学 JP Japan (JP) National Astronomical Observatory of Japan / 国立天文台(NAOJ) JP Japan (JP)

How to cite

APA:

Furuta, T., Kaneda, H., Kokusho, T., Nakajima, Y., Fukui, Y., & Tsuge, K. (2022). Three-dimensional geometry and dust/gas ratios in massive star-forming regions over the entire LMC as revealed by the IRSF/SIRIUS survey. Publications of the Astronomical Society of Japan. https://dx.doi.org/10.1093/pasj/psac025

MLA:

Furuta, Takuya, et al. "Three-dimensional geometry and dust/gas ratios in massive star-forming regions over the entire LMC as revealed by the IRSF/SIRIUS survey." Publications of the Astronomical Society of Japan (2022).

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