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CALIFA, the Calar Alto Legacy Integral Field Area survey, I : survey presentation

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Abstract
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 similar to 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 similar to 1.3 square', with a 100% covering factor by adopting a three-pointing dithering scheme. The optical wavelength range is covered from 3700 to 7000 angstrom, using two overlapping setups (V500 and V1200), with different resolutions: R similar to 850 and R similar to 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 3 sigma limiting surface brightness depth of similar to 23.0 mag/arcsec(2) for the V500 grating data (similar to 22.8 mag/arcsec(2) for V1200); (ii) about similar to 70% of the covered field-of-view is above this 3 sigma 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 similar to 8% with respect to SDSS; (v) the measured spectral resolution is similar to 85 km s(-1) for V1200 (similar to 150 km s(-1) for V500); (vi) the estimated accuracy of the wavelength calibration is similar to 5 km s(-1) for the V1200 data (similar to 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 these parameters across the field, reemphasizing the redshift dependence of single aperture spectroscopic measurements. We conclude from this first look at the data that CALIFA will be an important resource for archaeological studies of galaxies in the Local Universe.
Keywords
DIGITAL SKY SURVEY, POTSDAM MULTIAPERTURE SPECTROPHOTOMETER, STAR-FORMING GALAXIES, LINE-OF-SIGHT, SAURON PROJECT, LENTICULAR, GALAXIES, STELLAR POPULATION, NEARBY GALAXIES, INFRARED GALAXIES, ACTIVE, GALAXIES, techniques: spectroscopic, galaxies: active, galaxies: evolution, surveys, galaxies: ISM, galaxies: stellar content

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MLA
Sanchez, SF, et al. “CALIFA, the Calar Alto Legacy Integral Field Area Survey, I : Survey Presentation.” ASTRONOMY & ASTROPHYSICS, vol. 538, 2012.
APA
Sanchez, S., Kennicutt, R., Gil de Paz, A., van de Ven, G., Vilchez, J., Wisotzki, L., … Ziegler, B. (2012). CALIFA, the Calar Alto Legacy Integral Field Area survey, I : survey presentation. ASTRONOMY & ASTROPHYSICS, 538.
Chicago author-date
Sanchez, SF, RC Kennicutt, A Gil de Paz, G van de Ven, JM Vilchez, L Wisotzki, CJ Walcher, et al. 2012. “CALIFA, the Calar Alto Legacy Integral Field Area Survey, I : Survey Presentation.” ASTRONOMY & ASTROPHYSICS 538.
Chicago author-date (all authors)
Sanchez, SF, RC Kennicutt, A Gil de Paz, G van de Ven, JM Vilchez, L Wisotzki, CJ Walcher, D Mast, JAL Aguerri, S Albiol-Perez, A Alonso-Herrero, J Alves, J Bakos, T Bartakova, J Bland-Hawthorn, A Boselli, DJ Bomans, A Castillo-Morales, C Cortijo-Ferrero, A de Lorenzo-Caceres, A del Olmo, R-J Dettmar, A Diaz, S Ellis, J Falcon-Barroso, H Flores, A Gallazzi, B Garcia-Lorenzo, R Gonzalez Delgado, N Gruel, T Haines, C Hao, B Husemann, J Iglesias-Paramo, K Jahnke, B Johnson, B Jungwiert, V Kalinova, C Kehrig, D Kupko, AR Lopez-Sanchez, M Lyubenova, RA Marino, E Marmol-Queralto, I Marquez, J Masegosa, Sharon Meidt van der Wel, J Mendez-Abreu, A Monreal-Ibero, C Montijo, AM Mourao, G Palacios-Navarro, P Papaderos, A Pasquali, R Peletier, E Perez, I Perez, A Quirrenbach, M Relano, FF Rosales-Ortega, MM Roth, T Ruiz-Lara, P Sanchez-Blazquez, C Sengupta, R Singh, V Stanishev, SC Trager, A Vazdekis, K Viironen, V Wild, S Zibetti, and B Ziegler. 2012. “CALIFA, the Calar Alto Legacy Integral Field Area Survey, I : Survey Presentation.” ASTRONOMY & ASTROPHYSICS 538.
Vancouver
1.
Sanchez S, Kennicutt R, Gil de Paz A, van de Ven G, Vilchez J, Wisotzki L, et al. CALIFA, the Calar Alto Legacy Integral Field Area survey, I : survey presentation. ASTRONOMY & ASTROPHYSICS. 2012;538.
IEEE
[1]
S. Sanchez et al., “CALIFA, the Calar Alto Legacy Integral Field Area survey, I : survey presentation,” ASTRONOMY & ASTROPHYSICS, vol. 538, 2012.
@article{8622862,
  abstract     = {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 similar to 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 similar to 1.3 square', with a 100% covering factor by adopting a three-pointing dithering scheme. The optical wavelength range is covered from 3700 to 7000 angstrom, using two overlapping setups (V500 and V1200), with different resolutions: R similar to 850 and R similar to 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 3 sigma limiting surface brightness depth of similar to 23.0 mag/arcsec(2) for the V500 grating data (similar to 22.8 mag/arcsec(2) for V1200); (ii) about similar to 70% of the covered field-of-view is above this 3 sigma 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 similar to 8% with respect to SDSS; (v) the measured spectral resolution is similar to 85 km s(-1) for V1200 (similar to 150 km s(-1) for V500); (vi) the estimated accuracy of the wavelength calibration is similar to 5 km s(-1) for the V1200 data (similar to 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 these parameters across the field, reemphasizing the redshift dependence of single aperture spectroscopic measurements. We conclude from this first look at the data that CALIFA will be an important resource for archaeological studies of galaxies in the Local Universe.},
  articleno    = {A8},
  author       = {Sanchez, SF and Kennicutt, RC and Gil de Paz, A and van de Ven, G and Vilchez, JM and Wisotzki, L and Walcher, CJ and Mast, D and Aguerri, JAL and Albiol-Perez, S and Alonso-Herrero, A and Alves, J and Bakos, J and Bartakova, T and Bland-Hawthorn, J and Boselli, A and Bomans, DJ and Castillo-Morales, A and Cortijo-Ferrero, C and de Lorenzo-Caceres, A and del Olmo, A and Dettmar, R-J and Diaz, A and Ellis, S and Falcon-Barroso, J and Flores, H and Gallazzi, A and Garcia-Lorenzo, B and Gonzalez Delgado, R and Gruel, N and Haines, T and Hao, C and Husemann, B and Iglesias-Paramo, J and Jahnke, K and Johnson, B and Jungwiert, B and Kalinova, V and Kehrig, C and Kupko, D and Lopez-Sanchez, AR and Lyubenova, M and Marino, RA and Marmol-Queralto, E and Marquez, I and Masegosa, J and van der Wel, Sharon Meidt and Mendez-Abreu, J and Monreal-Ibero, A and Montijo, C and Mourao, AM and Palacios-Navarro, G and Papaderos, P and Pasquali, A and Peletier, R and Perez, E and Perez, I and Quirrenbach, A and Relano, M and Rosales-Ortega, FF and Roth, MM and Ruiz-Lara, T and Sanchez-Blazquez, P and Sengupta, C and Singh, R and Stanishev, V and Trager, SC and Vazdekis, A and Viironen, K and Wild, V and Zibetti, S and Ziegler, B},
  issn         = {1432-0746},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {DIGITAL SKY SURVEY,POTSDAM MULTIAPERTURE SPECTROPHOTOMETER,STAR-FORMING GALAXIES,LINE-OF-SIGHT,SAURON PROJECT,LENTICULAR,GALAXIES,STELLAR POPULATION,NEARBY GALAXIES,INFRARED GALAXIES,ACTIVE,GALAXIES,techniques: spectroscopic,galaxies: active,galaxies: evolution,surveys,galaxies: ISM,galaxies: stellar content},
  language     = {eng},
  pages        = {31},
  title        = {CALIFA, the Calar Alto Legacy Integral Field Area survey, I : survey presentation},
  url          = {http://dx.doi.org/10.1051/0004-6361/201117353},
  volume       = {538},
  year         = {2012},
}

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