| 研究実績の概要 |
Our first science question, “What regulates star formation?” has been the focus of three scientific papers published in FY15 (Silverman et al. 2015a,b; Kartaltepe et al. 2015). The first uses ALMA data to establish that high-z starburst galaxies form stars with high efficiency; this work was published in The Astrophysical Journal Letters and recognized by a press release by ALMA, and NAOJ. The second paper (Silverman et al. 2015b) presents the overall design, observational results, and first release of data products. We provided to the community higher level data products including catalogs of measurements for about 1000 star-forming galaxies. The spectroscopic redshifts are being used to train photometric redshift estimates for both the COSMOS field (Laigle et al. 2015 in press).
Significant progress has been achieved for the final acquisition of data and analysis of observations carried out with the Subaru. JSPS funds were used to support travel to work with collaborators at the COSMOS meeting (Helsinki), IAU General Assembly, Padova, Italy (Host: Dr. Alvio Renzini), and Dr. Emanuele Daddi (CEA-Saclay).
Also, we have submitted a paper to The Astrophysical Journal (Kashino et al.) on the emission line properties including chemical enrichment, ionization state, and gas pressure thus completing the FY15 science goal “II. A study on the ionization state of the ISM in galaxies at z~1.6.”. In addition, significant progress has been made in the analysis of the clustering of star-forming galaxies to address the question “Does the star formation rate depend on environment?”
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The level of attainment met in FY15 is best described by category ‘2’. This is due to facts that include the following: (1) three scientific papers have been accepted to leading peer-reviewed journals, (2) additional and final data acquisition with Subaru Telescope has completed the observations to be taken through the second and third Subaru Intensive programs (PI Silverman - S15A-134I; S16A-054I), (3) completion of high-level data products including spectra and catalogs now available to the public, (4) scientific results have been presented at major international meetings, (5) additional VLT observations through CEA-Saclay (PI Stephanie Juneau) have been acquired, and (6) the award of a new ALMA program in Cycle 3.
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| 今後の研究の推進方策 |
The research plan for FY2016 is the same as proposed for item V “Cold gas content and star formation efficiency of FMOS galaxies with ALMA”. In addition, we plan to investigate the impact of AGN on the Halpha emission line profiles. We also plan to expand upon the science goal “II. A study on the ionization state of the ISM in galaxies at z~1.6” by focusing such studies to the massive galaxies that were previously underrepresented but now have substantial numbers due to our continuing observational campaign that ends in April 2016. For the massive galaxies, we can further elucidate the physical reasons that high redshift galaxies are offset in standard emission line diagrams based on the ratios of [NII]/Halpha and [OIII]/Hbeta. To aid, we have acquired optical spectroscopy with Keck, and new data from VLT/VIMOS, to detect the [OII] emission line that enables us to break the degeneracy between metallicity and ionisation parameter.
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