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the calar alto legacy integral field area ( califa ) survey @xcite is an ongoing large project of the centro astronmico hispano - alemn at the calar alto observatory to obtain spatially resolved spectra for 600 local ( 0.005@xmath00.03 ) galaxies by means of integral field spectroscopy ( ifs ) .
califa observations started in june 2010 with the potsdam multi aperture spectrograph ( pmas ) , mounted to the 3.5  m telescope , utilizing the large ( 74@xmath1@xmath264@xmath1 ) hexagonal field - of - view ( fov ) offered by the ppak fiber bundle @xcite .
ppak was created for the disk mass survey ( bershady et al .
each galaxy is observed using two different setups , an intermediate spectral resolution one ( v1200 , @xmath3 ) , that cover the blue range of the optical wavelength range ( 3700 - 4700 ) , and a low - resolution one ( v500 , @xmath4 , that covers the first octave of the optical wavelength range ( 3750 - 7500 ) .
a diameter - selected sample of 939 galaxies were drawn from the 7th data release of the sloan digital sky survey ( sdss ) which is described in @xcite . from this mother sample
the 600 target galaxies are randomly selected , of which we have currently observed 517 objects ( december 2014 ) , being near to its conclusion .
combining the techniques of imaging and spectroscopy through optical ifs provides a more comprehensive view of individual galaxy properties than any traditional survey .
califa - like observations were collected during the feasibility studies ( mrmol - queralt et al .
2011 ; viironen et al .
2012 ) and the ppak ifs nearby galaxy survey ( pings , rosales - ortega et al .
2010 ) , a predecessor of this survey . first results based on those datasets already explored their information content ( e.g. rosales - ortega et al .
2010 ; rosales - ortega et al .
2012 ) .    compared with other ifs surveys
, califa offers an unique combination of ( i ) a sample covering a wide range of morphological types in a wide range of masses , sampling the color - magnitude diagram for m@xmath5 18 mag ; ( ii ) a large fov , that guarantees to cover the entire optical extension of the galaxies up to 2.5@xmath6 for an 80% of the sample ; and ( iii ) an accurate spatial sampling , with a typical spatial resolution of @xmath71 kpc for the entire sample , which allows to optical spatial resolved spectroscopic properties of most relevant structures in galaxies ( spiral arms , bars , buges , hii regions ... ) .
the penalty for a better spatial sampling of the galaxies is the somehow limited number of galaxies in the survey , e.g. , manga @xcite and sami @xcite . in terms of the spectral resolution , while in the red both survey have better spectral resolution than califa , in the the blue wavelength range both three have similar resolutions .    as a legacy survey ,
one of the main goals of the califa collaboration is to grant public access of the fully reduced datacubes . in november 2012
we deliver our 1st data release ( husemann et al . 2013 ) , comprising 200 datacubes corresponding to 100 objects . after almost two years , and a major improvement in the data reduction , we present our 2nd data release ( garcia benito et al . , 2014 ) , comprising 400 datacubes corresponding to 200 objects , the 1st of october 2014 .
the data products that can be derived from the ifu datasets obtained by the califa survey comprise information on the stellar populations , ionized gas , mass distribution and stellar and gas kinematics .
similar data products are derived for any of the indicated projects : atlas3d , manga or sami . in summary , they conform a panoramic view of the spatial resolved spectroscopic prorperties of these galaxies    different science goals have been already addressed using this information : ( i ) new techniques has been developed to understand the spatially resolved star formation histories ( sfh ) of galaxies ( cid fernandes et al . , 2013 , 2014 ) .
we found the solid evidence that mass - assembly in the typical galaxies happens from inside - out @xcite .
the sfh and chemical enrichment of bulges and early - type galaxies are fundamentally related to the total stellar mass , while for disk galaxies it is more related to the local stellar mass density @xcite ; negative age gradients indicate that the quenching is progressing outward in massive galaxies @xcite , and age and metallicity gradients suggest that galaxy bars have not alter signicantly the sfh of spirals @xcite ; ( ii ) we explore the origin of the low intensity , liner - like , ionized gas in galaxies .
these regions are clearly not related to star - formation activity , or to agn activity .
they are most probably relatd to post - agb ionization in many cases @xcite ; ( ii ) we explore the aperture and resolution effects on the data .
califa provides a unique tool to understand the aperture and resolution effects in larger single - fiber ( like sdss ) and ifs surveys ( like manga , sami ) .
we explored the effects of the dilution of the signal in different gas and stellar population properties ( mast et al . , 2014 ) , and proposed an new empirical aperture correction for the sdss data @xcite ; ( iv ) califa is the first ifu survey that allows gas and stellar kinematic studies for all morphologies with enough spectroscopic resolution to study ( a ) the kinematics of the ionized gas @xcite , ( b ) the effects of bars in the kinematics of galaxies @xcite ; ( c ) the effects of the intraction stage on the kinematic signatures ( barrera - ballesteros et al . ,
submitted ) , ( d ) measure the bar pattern speeds in late - type galaxies ( aguerri et al . ,
submitted ) , ( iv ) extend the measurements of the angular momentum of galaxies to previously unexplored ranges of morphology and ellipticity ( falcn - barroso et al . , in prep .
) ; and ( v ) finally we explore in detail the effects of galaxy interaction in the enhancement of star - formation rate and the ignition of galactic outflows @xcite .
the results based focused on the analysis of the  regions will be discussed in the next section .
the program to derive the properties of the  regions was initiated based on the data from the pings survey @xcite .
this survey acquired ifs mosaic data for a dozen of medium size nearby galaxies . in @xcite and
@xcite we studied in detail the ionized gas and regions of the largest galaxy in the sample ( ngc628 ) .
the main results of this studies are included in the contribution by rosales - ortega in the current edition .
we then continued the acquisition of ifs data for a larger sample of visually classified face - on spiral galaxies @xcite , as part of the feasibility studies for the califa survey @xcite .
the spatially resolved properties of a typical galaxy in this sample , ugc9837 , were presented by@xcite .    in @xcite
we presented a new method to detect , segregate and extract the main spectroscopic properties of regions from ifs data ( hiiexplorer ) . a preliminar catalog of @xmath72600 regions and aggregations extracted from 38 face - on spiral galaxies compiled from the pings and califa feasibility studies was presented .
we found a new local scaling relation between the stellar mass density and oxygen abundance , the so - called -z  relation @xcite .
the same catalog allows us explore the galactocentric radial gradient of the oxygen abundance @xcite .
we confirmed that up to @xmath72 disk effective radius there is a negative gradient of the oxygen abundance in all the analyzed spiral galaxies .
the gradient presents a very similar slope for all the galaxies ( @xmath8 dex/@xmath6 ) , when the radial distances are measured in units of the disk effective radii . beyond @xmath72 disk
effective radii our data show evidence of a flattening in the abundance , consistent with several other spectroscopic explorations , based mostly on a few objects ( e.g. * ? ? ?
_ left panel : _ distribution of the oxygen abundances at the effective radii as a function of the integrated stellar masses for the califa galaxies ( 236 , circles ) , together with those from the califa feasibility studies ( 31 , squares ) . _
right panel : _ distribution of the differential oxygen abundances with respect to the solid - line shown in the left - panel ( i.e. , the dependence on the stellar mass ) , as a function of the integrated sfr for the califa galaxies.,title="fig:",width=287 ] .
_ left panel : _ distribution of the oxygen abundances at the effective radii as a function of the integrated stellar masses for the califa galaxies ( 236 , circles ) , together with those from the califa feasibility studies ( 31 , squares ) . _
right panel : _ distribution of the differential oxygen abundances with respect to the solid - line shown in the left - panel ( i.e. , the dependence on the stellar mass ) , as a function of the integrated sfr for the califa galaxies.,title="fig:",width=287 ]    in @xcite we presented the first results based on the catalog of  regions extracted from a enlarged sample of galaxies ( @xmath7100 ) .
we studied the dependence of the @xmath9-z  relation with the star formation rate .
we found that no secondary relation different than the one induced by the well known relation between the star formation and the mass , contrary to what was claimed other authors @xcite , based on single aperture spectroscopic data ( sdss ) .
although the reason for the discrepancy is still not clear , we postulate that simple aperture bias , like the one present in previous datasets , may induce the reported secondary relation .
figure [ fig : mz ] presents an updated version of these results , including the last list of analyzed galaxies , until july 2014 ( 236 galaxies from the califa sample together with 31 galaxies from the califa - pilot studies ) .
the left panel shows the @xmath9-z  relation found for these galaxies , with color code indicating the integrated sfr for each galaxy .
it is appreciated that the stronger gradient in sfr is along the stellar mass , as expected for star - forming galaxies .
once subtracted the best fitted function to the @xmath9-z  relation , the residual of the abundance do not present any evident secondary relation with the sfr ( as it is seen in the right panel ) .
thus , the results presented in @xcite are confirmed with a sample of galaxies enlarged by almost a factor two .
we also confirmed the local -z  relation unveiled by @xcite , with a larger statistical sample of  regions ( @xmath75000 ) .
this nebular gas -z  relation is flatter than the one derived for the average stellar populations @xcite , but both of them agree for the younger stars , as expected if the most recent stars are born from the chmical enriched ism . in @xcite , we confirmed that the abundance gradients present a common slope up to @xmath72 effective radii , with a distribution compatible with being produced by random fluctuations , for all galaxies when normalized to the disk effective radius of @xmath100.1 dex/@xmath6 .
finally , in @xcite , we found evidence that  regions keep a memory of their past , by analysing the correspondance between the properties of these ionized regiones with that of their underlying stellar populations .
in summary the results from the califa survey present a coherent picture of the mass - growth and chemical enrichment of galaxies .
all the results indicate that the bulk of the galaxy population presents an inside - out growth ( at the mass range covered by the survey ) , with a chemical enrichment dominated by local processes , and limited effects by processes like outflows or radial mixing .
we present here a brief summary of the status of the on - going califa survey with an emphasis on the results that have been recently published . in particular , we make a summary of the most relevant results found regarding the properties of  regions discovered using this survey , and the evidence uncovered for an inside - out growth of galaxies .