NO EXCESS OF STAR FORMATION IN THE z = 1.4 STRUCTURE: Hα OBSERVATIONS OF THE RADIO-LOUD AGN 6CE1100+3505 FIELD

다국어 초록 (Multilingual Abstract)

We present the results of near-infrared imaging observations of the galaxy overdensity around the z = 1.44 radio-loud active galactic nucleus (AGN) 6CE1100+3505, which was carried out with the purpose of sampling the redshifted Hα emission from the actively star-forming galaxies that could constitute the overdensity. The existence of the structure around this AGN was spectroscopically confirmed by previous grism observations which are however limited to the central region. Using the CH4Off narrow/medium-band and H broad band filters in the Wide Infrared Camera (WIRCam) on the Canada-France-Hawaii Telescope (CFHT), we constructed a sample of objects that show a flux excess in the CH4Off band due to line emission. The emission line flux is ~ 4.9 10¯16 erg s¯1 cm¯2, corresponding to a star formation rate (SFR) of ~ 50M⊙ yr¯1 for galaxies at redshifts z ~ 1.4. None of the galaxies with medium-band flux excess is located within 1Mpc from the central AGN, and there is no evidence that the selected galaxies are associated with the proposed cluster. Along with the star formation quenching near the center that was found from the previous grism observations, the lack of extreme starbursts in the structure suggests that at z ~ 1.4, overdense regions are no longer favorable locations for vigorous star formation.

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