Differential atmospheric refraction in integral-field spectroscopy: Effects and correction

Arribas, S.; Mediavilla, E.; García-Lorenzo, B.; Burgo, C. del; Fuensalida, J. J.

doi:10.1051/aas:1999463

Cited by 36 publications

(30 citation statements)

References 5 publications

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“…In the case of IFS data, the DAR can be corrected empirically, after the observations, without requiring to know the original orientation of the instrument and without the need of a compensator (Emsellem et al 1996;Arribas et al 1999;Roth et al 2004). To do so, the reconstructed datacubes are thought of as a set of narrow-band images with a band-width equal to the spectral resolution.…”

Section: Differential Atmospheric Refractionmentioning

confidence: 99%

CALIFA, the Calar Alto Legacy Integral Field Area survey

Sánchez

Kennicutt

Paz

et al. 2012

A&A

Self Cite

1,112

586

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The final product of galaxy evolution through cosmic time is the population of galaxies in the local universe. These galaxies are also those that can be studied in most detail, thus providing a stringent benchmark for our understanding of galaxy evolution. Through the huge success of spectroscopic single-fiber, statistical surveys of the Local Universe in the last decade, it has become clear, however, that an authoritative observational description of galaxies will involve measuring their spatially resolved properties over their full optical extent for a statistically significant sample. We present here the Calar Alto Legacy Integral Field Area (CALIFA) survey, which has been designed to provide a first step in this direction. We summarize the survey goals and design, including sample selection and observational strategy. We also showcase the data taken during the first observing runs (June/July 2010) and outline the reduction pipeline, quality control schemes and general characteristics of the reduced data. This survey is obtaining spatially resolved spectroscopic information of a diameter selected sample of ∼600 galaxies in the Local Universe (0.005 < z < 0.03). CALIFA has been designed to allow the building of two-dimensional maps of the following quantities: (a) stellar populations: ages and metallicities; (b) ionized gas: distribution, excitation mechanism and chemical abundances; and (c) kinematic properties: both from stellar and ionized gas components. CALIFA uses the PPAK integral field unit (IFU), with a hexagonal field-of-view of ∼1.3 , with a 100% covering factor by adopting a three-pointing dithering scheme. The optical wavelength range is covered from 3700 to 7000 Å, using two overlapping setups (V500 and V1200), with different resolutions: R ∼ 850 and R ∼ 1650, respectively. CALIFA is a legacy survey, intended for the community. The reduced data will be released, once the quality has been guaranteed. The analyzed data fulfill the expectations of the original observing proposal, on the basis of a set of quality checks and exploratory analysis: (i) the final datacubes reach a 3σ limiting surface brightness depth of ∼23.0 mag/arcsec 2 for the V500 grating data (∼22.8 mag/arcsec 2 for V1200); (ii) about ∼70% of the covered field-of-view is above this 3σ limit; (iii) the data have a blue-to-red relative flux calibration within a few percent in most of the wavelength range; (iv) the absolute flux calibration is accurate within ∼8% with respect to SDSS; (v) the measured spectral resolution is ∼85 km s −1 for V1200 (∼150 km s −1 for V500); (vi) the estimated accuracy of the wavelength calibration is ∼5 km s −1 for the V1200 data (∼10 km s −1 for the V500 data); (vii) the aperture matched CALIFA and SDSS spectra are qualitatively and quantitatively similar. Finally, we show that we are able to carry out all measurements indicated above, recovering the properties of the stellar populations, the ionized gas and the kinematics of both components. The associated maps illustrate the spatial variation of...

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Section: Differential Atmospheric Refractionmentioning

confidence: 99%

CALIFA, the Calar Alto Legacy Integral Field Area survey

Sánchez

Kennicutt

Paz

et al. 2012

A&A

Self Cite

1,112

586

View full text Add to dashboard Cite

show abstract

“…We obtained typical wavelength calibration errors of 0.1 8, which give velocity uncertainties of AE6 and AE4.5 km s À1 for [O iii] k5007 and H, respectively. We corrected the spectra for differential atmospheric refraction effects following the method proposed by Arribas et al (1999); the differential atmospheric refraction was estimated according to the model given by Allen (1973). In those cases in which the air mass was close to one, such correction was not necessary.…”

Section: Data Reduction and Analysismentioning

confidence: 99%

Integral Field Spectroscopy of Blue Compact Dwarf Galaxies

García-Lorenzo

Cairós

Caon

et al. 2008

ApJ

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We present results of integral field optical spectroscopy of five luminous blue compact dwarf galaxies. The data were obtained using the fiber system INTEGRAL attached to the William Herschel Telescope. region with a resolution of 0.9 00 spaxel À1 . We use high-resolution optical images to isolate the star-forming knots in the objects; line ratios, electron densities, and oxygen abundances in each of these regions are computed. We build continuum and emission-line intensity maps, as well as maps of the most relevant line ratios:/H, and H/H, which allow us to obtain spatial information on the ionization structure and mechanisms. We also derive the gas velocity field from the H and [O iii] k5007 emission lines. We find that all five galaxies are in the high end of the metallicity range of blue compact dwarfs with oxygen abundances varying from Z ' 0:3 to 1.5 Z . The objects show H iiYlike ionization in the whole field of view, except the outer regions of III Zw 102, whose large [N ii] k6584/H values suggest the presence of shocks. The five galaxies display inhomogeneous extinction patterns, and three of them have high H/H ratios, indicative of a large dust content; all of the galaxies display complex, irregular velocity fields in their inner regions.

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“…We obtained typical wavelength calibration errors of 0.1Å, which give velocity uncertainties of ±6, and ±4.5 km s −1 for [O iii] λ5007 and Hα, respectively. We corrected the spectra for differential atmospheric refraction effects following the method proposed by Arribas et al (1999). To apply this method we used the atmospheric temperature and pressure given by the Carlsberg Meridian Circle Catalogue (1998) and we estimate the differential atmospheric refraction according to the model given by Allen (1973).…”

Section: Data Reductionmentioning

confidence: 99%

Stellar and ionized gas kinematics of the interacting Seyfert 1.9 galaxy NGC 2992

García-Lorenzo

Arribas

Mediavilla

2001

A&A

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Abstract. Integral field spectroscopy in the central 16 × 12 (2.4 kpc × 1.8 kpc, if H0 = 75 km s −1 Mpc −1 ) of the Seyfert 1.9 galaxy NGC 2992 has been obtained using the fibre system INTEGRAL. The data are mainly used to study the stellar and ionized gas kinematics. In spite of the photometric disruptions in the outer parts (r > 6 kpc) produced by the interaction with its close companion (NGC 2993), the present stellar velocity field shows regular rotation. The ionized gas presents several kinematically distinct components. Apart from the outflowing component already reported by other authors, we found an additional (high ionization) kinematic component which seems to be associated with the boundaries of the figure-of-eight-shaped emission detected in the 6 cm radio map. We locate the hidden nucleus in the apex of the biconical structure defined by the [O iii] emission, coincident with the outflow origin and with the center of the dust lane. We do not find any clear evidence of direct influence of the interaction in the kinematics of the stars or the ionized gas in the circumnuclear region of NGC 2992.

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Differential atmospheric refraction in integral-field spectroscopy: Effects and correction

Abstract: Abstract. The basic concepts for determining the effect of differential atmospheric refraction on integral-field (twodimensional) spectroscopic observations are presented, and a method for correcting the spectra from this effect is given. The method is demonstrated with real data.

Cited by 36 publications

References 5 publications

CALIFA, the Calar Alto Legacy Integral Field Area survey

CALIFA, the Calar Alto Legacy Integral Field Area survey

Integral Field Spectroscopy of Blue Compact Dwarf Galaxies

Stellar and ionized gas kinematics of the interacting Seyfert 1.9 galaxy NGC 2992

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