Probing the mass-assembly history of star-forming galaxies using Subaru laser guide star adaptive optics system

2015 Fiscal Year Final Research Report

• Project/Area Number: 25800117
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Minowa Yosuke 国立天文台, ハワイ観測所, 助教 (60450194)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 銀河進化 / 銀河形成 / 補償光学 / 光赤外線天文学

Outline of Final Research Achievements

The main purpose of this research is to shed new light on the histories of galaxy assembly by obtaining spatially-resolved mapping of star-formation activities within distant galaxies at redshift ~ 2, which corresponds to about 10 billion years ago. For this specific purpose, we developed new infrared narrow-band filters whose central wavelength are adjusted to include Hα emission lines from star-forming galaxies at redshift ~ 2 and conducted high-resolution imaging observation using the adaptive optics system and infrared imager onboard the Subaru telescope. We have successfully spatially-resolve the star-forming region and obtained the maps of the stellar age and star-forming activities within the galaxies at redshift ~ 2. Our preliminary results show that the star-formation is more active at the outer clump rather than the central region in the star-forming galaxy.

Free Research Field

銀河天文学