Galaxy And Mass Assembly (GAMA): Spectroscopic analysis

Дата и время публикации : 2013-01-30T02:33:15Z

Авторы публикации и институты :
A. M. Hopkins (Australian Astronomical Observatory)
S. P. Driver (International Centre for Radio Astronomy Research Australia, University of St Andrews)
S. Brough (Australian Astronomical Observatory)
M. S. Owers (Australian Astronomical Observatory)
A. E. Bauer (Australian Astronomical Observatory)
M. L. P. Gunawardhana (Australian Astronomical Observatory, University of Sydney)
M. E. Cluver (Australian Astronomical Observatory)
M. Colless (Australian Astronomical Observatory)
C. Foster (European Southern Observatory)
M. A. Lara-Lopez (Australian Astronomical Observatory)
I. Roseboom (University of Edinburgh)
R. Sharp (Australian National University)
O. Steele (University of Portsmouth)
D. Thomas (University of Portsmouth)
I. K. Baldry (Liverpool John Moores University)
M. J. I. Brown (Monash University)
J. Liske (European Southern Observatory)
P. Norberg (Durham University)
A. S. G. Robotham (International Centre for Radio Astronomy Research Australia, University of St Andrews)
S. Bamford (University of Nottingham)
J. Bland-Hawthorn (University of Sydney)
M. J. Drinkwater (University of Queensland)
J. Loveday (University of Sussex)
M. Meyer (International Centre for Radio Astronomy Research Australia)
J. A. Peacock (University of Edinburgh)
R. Tuffs (Max Planck Institute for Nuclear Physics)
N. Agius (University of Central Lancashire)
M. Alpaslan (International Centre for Radio Astronomy Research Australia, University of St Andrews)
E. Andrae (Max Planck Institute for Nuclear Physics)
E. Cameron (Max Planck Institute for Nuclear Physics)
S. Cole (Durham University)
J. H. Y. Ching (University of Sydney)
L. Christodoulou (University of Sussex)
C. Conselice (University of Nottingham)
S. Croom (University of Sydney)
N. J. G. Cross (University of Edinburgh)
R. De Propris (Cerro Tololo Inter-American Observatory)
J. Delhaize (International Centre for Radio Astronomy Research Australia)
L. Dunne (University of Canterbury)
S. Eales (Cardiff University)
S. Ellis (Australian Astronomical Observatory)
C. S. Frenk (Durham University)
A. Graham (Swinburne University)
M. W. Grootes (Max Planck Institute for Nuclear Physics)
B. Haussler (University of Nottingham)
C. Heymans (University of Edinburgh)
D. Hill (University of St Andrews)
B. Hoyle (Marti i Franques Spain)
M. Hudson (University of Waterloo)
M. Jarvis (University of Oxford, University of the Western Cape)
J. Johansson (Max-Planck Institut fuer Astrophysik)
D. H. Jones (Monash University)
E. van Kampen (European Southern Observatory)
L. Kelvin (International Centre for Radio Astronomy Research Australia, University of St Andrews)
K. Kuijken (Leiden University)
A. Lopez-Sanchez (Australian Astronomical Observatory, Macquarie University)
S. Maddox (University of Canterbury)
B. Madore (Carnegie Institution for Science)
C. Maraston (University of Portsmouth)
T. McNaught-Roberts (Durham University)
R. C. Nichol (University of Portsmouth)
S. Oliver (University of Sussex)
H. Parkinson (University of Edinburgh)
S. Penny (Monash University)
S. Phillipps (University of Bristol)
K. A. Pimbblet (Monash University)
T. Ponman (University of Birmingham)
C. C. Popescu (University of Central Lancashire)
M. Prescott (University of the Western Cape)
R. Proctor (Universidade de Sao Paulo)
E. M. Sadler (University of Sydney)
A. E. Sansom (University of Central Lancashire)
M. Seibert (Carnegie Institution for Science)
L. Staveley-Smith (International Centre for Radio Astronomy Research Australia)
W. Sutherland (Queen Mary University London)
E. Taylor (University of Sydney)
L. Van Waerbeke (University of British Columbia)
J. A. Vazquez-Mata (University of Sussex)
S. Warren (Imperial College London)
D. B. Wijesinghe (University of Sydney)
V. Wild (University of St Andrews)
S. Wilkins (University of Oxford)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 19 pages, 19 figures, accepted for publication in MNRAS
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric and spectroscopic survey, using the AAOmega spectrograph on the Anglo-Australian Telescope to obtain spectra for up to ~300000 galaxies over 280 square degrees, to a limiting magnitude of r_pet < 19.8 mag. The target galaxies are distributed over 0<z<0.5 with a median redshift of z~0.2, although the redshift distribution includes a small number of systems, primarily quasars, at higher redshifts, up to and beyond z=1. The redshift accuracy ranges from sigma_v~50km/s to sigma_v~100km/s depending on the signal-to-noise of the spectrum. Here we describe the GAMA spectroscopic reduction and analysis pipeline. We present the steps involved in taking the raw two-dimensional spectroscopic images through to flux-calibrated one-dimensional spectra. The resulting GAMA spectra cover an observed wavelength range of 3750<lambda<8850 A at a resolution of R~1300. The final flux calibration is typically accurate to 10-20%, although the reliability is worse at the extreme wavelength ends, and poorer in the blue than the red. We present details of the measurement of emission and absorption features in the GAMA spectra. These measurements are characterised through a variety of quality control analyses detailing the robustness and reliability of the measurements. We illustrate the quality of the measurements with a brief exploration of elementary emission line properties of the galaxies in the GAMA sample. We demonstrate the luminosity dependence of the Balmer decrement, consistent with previously published results, and explore further how Balmer decrement varies with galaxy mass and redshift. We also investigate the mass and redshift dependencies of the [NII]/Halpha vs [OIII]/Hbeta spectral diagnostic diagram, commonly used to discriminate between star forming and nuclear activity in galaxies.

Category: Physics