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2015 Fiscal Year Research-status Report

The FMOS-COSMOS survey of star-forming galaxies at z~1.6 using Subaru/FMOS

Research Project

Project/Area Number 26400221
Research InstitutionThe University of Tokyo

Principal Investigator

SILVERMAN John  東京大学, カブリ数物連携宇宙研究機構, 特任助教 (90573030)

Project Period (FY) 2014-04-01 – 2017-03-31
KeywordsInterstellar medium / star formation / galaxy evolution
Outline of Annual Research Achievements

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?”

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

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.

Strategy for Future Research Activity

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.

  • Research Products

    (11 results)

All 2015 Other

All Int'l Joint Research (3 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Acknowledgement Compliant: 1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Int'l Joint Research] University of Hawaii/Rochester Institute of Technology(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      University of Hawaii/Rochester Institute of Technology
  • [Int'l Joint Research] CEA-Saclay(France)

    • Country Name
      France
    • Counterpart Institution
      CEA-Saclay
  • [Int'l Joint Research] Astronomical Observatory of Padova(Italy)

    • Country Name
      Italy
    • Counterpart Institution
      Astronomical Observatory of Padova
  • [Journal Article] A higher efficiency of converting gas to stars push galaxies at z~1.6 well above the star-forming main sequence2015

    • Author(s)
      J. D. Silverman, E. Daddi, G. Rodighiero, W. Rujopakarn, M. Sargent, A. Renzini, D. Liu, C. Feruglio, D. Kashino, D. Sanders, J. Kartaltepe, T. Nagao, N. Arimoto, S. Berta, M. Bethermin, A. Koekemoer, D. Lutz, G. Magdis, C. Mancini, M. Onodera, and G. Zamorani
    • Journal Title

      The Astrophysical Journal Letters

      Volume: Volume 812, Number 2 Pages: 23-30

    • DOI

      10.1088/2041-8205/812/2/L23

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The FMOS-COSMOS survey of star-forming galaxies at z~1.6 III. Survey design, performance and sample characteristics2015

    • Author(s)
      J. D. Silverman, D. Kashino, D. Sanders, J. S. Kartaltepe, N. Arimoto, A. Renzini, G. Rodighiero, E. Daddi, J. Zahid, T. Nagao, L. J. Kewley, S. J. Lilly, N. Sugiyama, I. Baronchelli, P. Capak, C. M. Carollo, J. Chu, G. Hasinger, O. Ilbert, S. Juneau, M. Kajisawa, A. M. Koekemoer, K. Kovac, O. Le Fevre, et al.
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: Volume 220, Number 1 Pages: 12-36

    • DOI

      10.1088/0067-0049/220/1/12

    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Rest-frame Optical Emission Lines in Far-Infrared Selected Galaxies at z<1.7 from the FMOS-COSMOS Survey2015

    • Author(s)
      Jeyhan S. Kartaltepe, D. B. Sanders, J. D. Silverman, D. Kashino, J. Chu, H. Zahid, G. Hasinger, L. Kewley, K. Matsuoka, T. Nagao, L. Riguccini, M. Salvato, K. Schawinski, Y. Taniguchi, E. Treister, P. Capak, E. Daddi, and K. Ohta
    • Journal Title

      The Astrophysical Journal Letters

      Volume: Volume 806, Number 2 Pages: 35-41

    • DOI

      10.1088/2041-8205/806/2/L35

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Rest-frame optical emission line properties of high-z galaxies in different environments2015

    • Author(s)
      John Silverman
    • Organizer
      TAO SWIMS Team meeting
    • Place of Presentation
      NAOJ, Mitaka, Japan
    • Year and Date
      2015-09-17 – 2015-09-17
    • Invited
  • [Presentation] Impact of galaxy mergers and interactions on triggering AGNs2015

    • Author(s)
      John Silverman
    • Organizer
      Science Program IAU XXIX General Assembly
    • Place of Presentation
      Hawaii Convention Center, Honolulu, Hawaii
    • Year and Date
      2015-08-06 – 2015-08-06
    • Int'l Joint Research
  • [Presentation] A higher efficiency of converting gas to stars in high-z starbursts2015

    • Author(s)
      John Silverman
    • Organizer
      Star Formation Workshop 2015
    • Place of Presentation
      NAOJ, Mitaka, Japan
    • Year and Date
      2015-06-29 – 2015-06-29
    • Int'l Joint Research / Invited
  • [Presentation] Environmental influences on the growth of supermassive black holes2015

    • Author(s)
      John Silverman
    • Organizer
      Let's group. The life cycle of galaxies in their favorite environment
    • Place of Presentation
      Max Planck for Astrophysics, Garching, Germany
    • Year and Date
      2015-06-17 – 2015-06-17
    • Int'l Joint Research / Invited
  • [Presentation] FMOS-COSMOS: a status report and ALMA followup2015

    • Author(s)
      John Silverman
    • Organizer
      COSMOS meeting 2015
    • Place of Presentation
      Helsinki, Finland
    • Year and Date
      2015-06-14 – 2015-06-14
    • Int'l Joint Research

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Published: 2017-01-06   Modified: 2022-01-27  

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