ISAAC spectroscopy of emission line galaxies at z = 2.2

Alan F. M. Moorwood; Paul P. van der Werf; Jean Gabriel Cuby; Ernesto Oliva

doi:10.1117/12.390160

29 June 2000 ISAAC spectroscopy of emission line galaxies at z = 2.2

Alan F. M. Moorwood, Paul P. van der Werf, Jean Gabriel Cuby, Ernesto Oliva

Proceedings Volume 4005, Discoveries and Research Prospects from 8- to 10-Meter-Class Telescopes; (2000) https://doi.org/10.1117/12.390160
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

The IR Spectrometer and Array Camera (ISAAC) at the VLT has ben used for follow-up spectroscopy of 11 candidate H(alpha) emitting galaxies at z approximately equals 2.2 detected in a preparatory, IR narrow band filter imaging survey. This survey was conducted with Son of ISAAC at the ESO NTT and covered an area of 100 sq. arcmin including the WFPC2 and STIS fields in the HDFS. Line emission within the wavelength range of the 2.1 micrometers narrow band filters is confirmed in 6 of the candidates and in all but one of the 6 detected at >= 4 (sigma) in the survey. Although only a single emission line is observed its identification with H(alpha) is relatively secure and the absence of (NII) (6548,6584 Angstrom) is consistent with high ionization and/or low metallicity systems. Velocity dispersions and one H(alpha) rotation curve imply masses of up to approximately 10¹⁰M. Star formation rates of the individual galaxies derived from the H(alpha) fluxes are 20-35 M yr^-1 and the total star formation rate density is 0.12 M Mpc^-3. This is the same as found at z approximately equals 1.3 from H(alpha) observations with NICMOS on HST$_1) and close to that at z equals 3-4.5 derived from the extinction corrected UV continuum fluxes of Lyman Break galaxies².

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Alan F. M. Moorwood, Paul P. van der Werf, Jean Gabriel Cuby, and Ernesto Oliva "ISAAC spectroscopy of emission line galaxies at z = 2.2", Proc. SPIE 4005, Discoveries and Research Prospects from 8- to 10-Meter-Class Telescopes, (29 June 2000); https://doi.org/10.1117/12.390160

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KEYWORDS

Galactic astronomy

Stars

Spectroscopy

Ultraviolet radiation

Infrared spectroscopy

Infrared imaging

Telescopes

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