Optical to near-infrared spectrum of a massive evolved galaxy at z = 1.26

Y. Matsuoka*, B. A. Peterson, S. Oyabu, K. Kawara, N. Asami, H. Sameshima, N. Ienaka, T. Nagayama, M. Tamura

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)


    We present the optical to near-infrared (IR) spectrum of the galaxy TSPS J1329-0957, a red and bright member of the class of extremely red objects (EROs) at z = 1.26. This galaxy was found in the course of the Tokyo-Stromlo Photometry Survey (TSPS) which we are conducting in the southern sky. The spectroscopic observations were carried out with the Gemini Multi-Object Spectrograph (GMOS) and the Gemini Near Infra-Red Spectrograph (GNIRS) mounted on the Gemini-South telescope. The wide wavelength coverage of 0.6-2.3 μm provides useful clues as to the nature of EROs while most published spectra are limited to a narrower spectral range which is dictated by the need for efficient redshift determination in a large survey. We compare our spectrum with several optical composite spectra obtained in recent large surveys, and with stellar population synthesis models. The effectiveness of using near-IR broadband data, instead of the spectral data, in deriving the galaxy properties are also investigated. We find that TSPS J1329-0957 formed when the universe was 2-3 Gyr old, and subsequently evolved passively to become one of the most massive galaxies found in the z = 1-2 universe. Its early type and estimated stellar mass of M* = 1111.5 M clearly point to this galaxy being a direct ancestor of the brightest elliptical and spheroidal galaxies in the local universe.

    Original languageEnglish
    Pages (from-to)767-772
    Number of pages6
    JournalAstrophysical Journal
    Issue number2
    Publication statusPublished - 1 Oct 2008


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