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JHK Spectra of the z=2.39 Radio Galaxy 53W002 | | K. Motohara
; T. Yamada
; F. Iwamuro
; R. Hata
; T. Taguchi
; T. Harashima
; T.Maihara
; M. Iye
; C. Simpson
; M. Yoshida
; | | Date: |
30 Apr 2001 | | Subject: | astro-ph | | Affiliation: | 1 and 2), T. Yamada (3 and 4), F. Iwamuro , R. Hata , T. Taguchi , T. Harashima , T.Maihara , M. Iye , C. Simpson , M. Yoshida ( NAOJ, Subaru Telescope, Kyoto University, National Astronomical Observatory of Japan, Tohoku University | | Abstract: | We present low-resolution, near-IR JHK spectra of the weak z=2.39 radio galaxy 53W002, obtained with the OH-airglow Suppressor spectrograph (OHS) and Cooled Infrared Spectrograph and Camera for OHS (CISCO) on the Subaru Telescope. They cover rest-frame wavelengths of 3400-7200 A, and the emission lines of [O II]3727, Hb, [O III]4959, 5007, Ha, [N II]6548, 6583 and [S II]6716, 6731 were detected. Using the Ha/Hb line ratio, we find an extinction of E(B-V)=0.14. The emission-line ratios are reproduced by a cloud of electron density n_e=1x10^{3-4}(/cm3) with solar metallicity, ionized by an alpha=-0.7 power-law continuum with ionizing parameter U=1x10^-3. In addition to these emission lines, we make the first spectroscopic confirmation of the Balmer discontinuity in a high-z radio galaxy. Together with rest-frame UV photometry from the literature, we show that at least 1/3 of the present stellar mass was formed in the current starburst. The stellar mass was estimated to be (1-1.4)x10^11 M_sol by one-component model fitting, which is smaller than that of typical z~1 B2/6C radio galaxies. We suggest that 53W002 is currently assembling a large part of its stellar mass through merger events with the surrounding sub-galactic clumps, some of which can be identified with the Lya emitters detected in narrow-band imaging. After a few such events over the next few Gyr, 53W002 will evolve into a massive elliptical galaxy. | | Source: | arXiv, astro-ph/0104473 | | Services: | Forum | Review | PDF | Favorites | |
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