The ESO Archive Community Forum is a platform for sharing ideas and methods, asking questions and sending feedback and suggestions on how to improve and use the new ESO Archive Science Portal and on how to  gain Programmatic and tool access to the archive science portal. 

Contributions are welcome from the users, also without any need for registration, they are pre-approved, monitored and moderated by the ESO Archive Science Group (ASG).    

If you wish to contribute to the knowledge exchange, please choose a Forum from the right panel or from the drop-down menu on the top of this page and write a message. An agent will receive it and make it public as soon as possible. 

Please be aware that the official help concerning data access, data reduction and pipelines is provided by the ESO User Support Department. 

Please observe the usual basic netiquette rule of remain professional, respectful, and courteous at all times.


New band-merged source catalog released by the VVV survey

Archive Science Group 2 weeks ago 0


A new version of the VVV VISTA Public Survey source catalogue is now available from the ESO Archive. The imaging data in the ZYJHKs bands from which the source catalogue is extracted are acquired under ESO programme 179.B-2002 before the 26th of September 2015.

The source catalogue covers the full area of the VVV survey on the Milky Way bulge and disk. It comprises 348 survey tiles for a total of 540 deg2 where more than 590 million sources are detected. Compared to the previous published versions, this catalogue provides additional data, it includes two separate epochs of contemporaneous JHKs photometry and two separate epochs of contemporaneous ZY photometry.

The VVV images utilized for the source extraction were processed with pipeline version v1.3 or grater by the Cambridge Astronomical Survey Unit (CASU). These higher versions of the pipeline implement significant improvements to the data quality, such as improved photometric calibration procedures and more extensive Quality Control to identify bad data. Source catalogues were then created by the Wide Field Astronomy Unit (WFAU) at the Royal Observatory, Edinburgh.

The catalogue entries can be browsed via the Catalog Query Interface or TAP; the catalogue FITS files can be discovered and downloaded via ASP or programmatically. More details are provided in the accompanying documentation.


APEX-LABOCA flux map of M83 released

Archive Science Group 2 weeks ago 0


This new data release includes a flux map at 870 μm for the galaxy M83 (NGC 5236). It is obtained from the combination of the observations taken with the Large APEX Bolometer Camera (LABOCA) under the ESO programme id 081.C-0827(A), PI A. Lundgren, between 2008-06-19 and 2008-06-30.

The total exposure time of the flux map is 0.5 hours, it has a signal to noise ratio of 47 in the galaxy central region, while the inner spiral arms are detected with a signal to noise ratio of more than 3. The atmospheric window of 870 μm, in which LABOCA operates, provides the opportunity to study the dust in the interstellar medium and the grain size distribution.

More information is available in the release documentation. The data can be accessed via the ESO Science Portal or programmatically.


Joint first and second data releases of the X-SHOOTER Spectral Library (XSL)

Archive Science Group 2 weeks ago updated 2 weeks ago 0

The X-SHOOTER Spectral Library project (XSL, http://xsl.u-strasbg.fr/) aims to build a new, moderate-resolution stellar spectral library for use in stellar population modelling. Once completed the XSL will represent a significant improvement on current empirical stellar spectral libraries in terms of stellar parameters and wavelength coverage. The survey was conducted in two phases: a two-semester pilot survey (084.B-0869 and 085.B-0751) followed up by a Large Programme (189.B-0925, PI S.C Trager). The entire survey delivers spectra of a total of nearly 700 unique stars.

The joint science spectra products from the first and second XSL data releases are now available to the community via the ESO archive. The second data release (DR2) contains all the spectra obtained from the six semesters of the ESO Large Programme and consist of three segments that were observed simultaneously (UVB, VIS, NIR). If combined, the 1D spectra products cover the wavelength range between 300 nm and 2.45 μm, at a spectral resolving power close to R = 10 000. The spectra were corrected for instrument transmission and telluric absorption, and they were also corrected for wavelength-dependent flux-losses in 85% of the cases. The final spectra were corrected for radial velocity and are provided in the rest-frame (with wavelengths in air). The DR2 release supersedes the first data release (DR1) from 2014 (initially released via the XSL website only and now also available in the ESO archive as of October 2020), with a larger number of spectra (813 observations of 666 stars) and with a more extended wavelength coverage as the data from the near-infrared arm of the X-SHOOTER spectrograph are now included. The total volume of XSL DR2 is 0.7 GB. In DR1, 246 spectra of 237 unique stars were presented, which were observed during the pilot program, for a wavelength range that was restricted to the two optical arms of X-SHOOTER (300–1024 nm), for a total volume of 140 MB.

More information about the data release contents can be found in the accompanying documentation [PDF DR2, PDF DR1]. The data products are available via the science portal and programmatically [data DR2, data DR1].


First Data Release of the SINFONI Survey for Unveiling the Physics and the Effect of Radiative feedback (SUPER)

Archive Science Group 3 weeks ago updated 3 weeks ago 0

The first data release of the SINFONI Survey for Unveiling the Physics and the Effect of Radiative feedback (SUPER, Circosta et al. 2018; ESO Large Programme 196.A-0377, PI: Mainieri) is now available to the community on ESO Archive via the Science Portal or programmatically


This release consists of 20 SINFONI cubes targeting z=2-2.5 Type-1 AGNs in the H (or H+K) band. The adaptive optics module was employed during the IFU observations, abating the effects of atmospheric turbulence down to a superb angular resolution of 0.2 arcsecond (corresponding to ~2 kpc at the AGN redshifts). In combination with the long exposures (of the order of 1-7 hour), the data provides 3D spatially resolved high-quality maps of the Hβ and [OIII] emission lines and of the star emission from the AGN host galaxies.

More information about the release content can be found in the accompanying documentation.


First Data Release of the Fornax Deep Survey (FDS)

Archive Science Group 2 months ago 0


The first data release of the Fornax Deep Survey with VST (FDS, Venhola et al., 2018, A&A, 620, 165) is now available on the ESO archive.

This consists of 97 high quality images (and of the corresponding weight maps) obtained by stacking u’, g’, r’, and i’-bands data collected with OmegaCAM on the VST from February 2013 to November 2017.

With exposure times ranging from 2 to 12 hours over an area of ~28 square degrees, this survey is a legacy data-set for studies of members of the Fornax Galaxy Cluster and the infalling Fornax A Group down to a surface brightness limit of ~28 mag/arcsec2 (1-sigma surface brightness over a 1 arcsecond2 area) and opens a new parameter regime to investigate the role of the cluster environment in shaping the properties of its galaxy population.

In these release, 181 Gb of (compressed) fits files reduced using the AstroWISE system are present. Catalogues with the complete sample of sources including dwarf galaxies part of the cluster, globular clusters, and background galaxies will be provided in forthcoming releases.

More information about the release content can be found in the accompanying documentation. The products are available via the Science Portal or programmatically.


New FEROS 1D spectra products published in the ESO Archive

Archive Science Group 2 months ago 0


Archive users are informed that the in-house processed 1D spectra products for FEROS are now available for the months July, August, September, and October 2019. A total of 1432 new reduced 1D spectra have been added to the FEROS collection and are now downloadable from the archive science pages or programmatically.

These newly processed science products complement the set of the already available ~60,000 1D spectra for FEROS. This service is now resumed following the suspension in February 2020.


Second data release of the Next Generation Transit Survey

Archive Science Group 2 months ago updated 2 months ago 0


The Next Generation Transit Survey (NGTS) is a ground based exoplanet survey designed to detect Neptune and super-Earth sized planets orbiting around bright stars, using the transit method. The NGTS facility consists of 12 fully-robotic 20 cm f/2.8 telescopes located at the ESO site on Paranal, Chile. Each telescope has a 2.8x2.8 deg2 field of view and is equipped with a custom filter with a bandpass of 520-890nm, which increases sensitivity to late-K and early-M stars.

This second data release (DR2) includes 72 separate fields that have been completed from the start of commissioning in September 2015, till April 2018. The data of the 24 fields already provided within DR1 have been reprocessed with an improved version of the reduction pipeline. A source catalogue down to 16th magnitude is provided, together with the light curves obtained with aperture photometry in addition to the reduced, astrometrically calibrated, stacked dithered images. More than six hundred thousand sources were monitored with a 13 second cadence, collecting almost 110 billion photometric measurements in total. The overall data volume is about 4 Terabytes.

All data are publicly accessible from the Science Portal or programmatically in a file-by-file fashion. Per-source data access is provided by the Catalogue Facility or via TAP. Detailed information is available in the accompanying release documentation.


Release of pipeline processed and telluric corrected KMOS 3D data cubes

Archive Science Group 2 months ago 0


This data release provides 3D data cubes obtained from KMOS, the K-band Multi-Object Spectrograph.

The instrument is located at the VLT UT1 telescope and has 24 image slicer Integral Field Units (IFUs) that can be placed independently in the patrol field of 7.2 arcmin diameter. Each IFU has 14 slices with 14 spatial pixels along each slice and a field-of-view of 2.8’’x2.8’’ which gives a spatial resolution of 0.2’’. Spectral resolving power depends on the grating and is between 2000 and 4200. This initial release consists of observations from October 2013 (i.e. start of operations) until February 2020. The content of the release grows with time as new data are being acquired and processed.

Data have been reduced using the KMOS pipeline version 2.7.3 or higher. Data reduction is executed first for each IFU containing an object. It includes sky subtraction, flat fielding, wavelength calibration, flux calibration, and cube reconstruction. Telluric absorption features in the individual cube spectra are corrected. For this, an atmospheric model is fit to the closest-in-time telluric standard star measurement using the molecfit software. This model is scaled with the airmass difference between science observation and standard star measurement and applied to the extracted spectra. Flux calibration is applied using the zero-point measurement from the same standard star, without assessment of the photometric conditions. Note that all standard stars serve both as telluric and as photometric standards.

The KMOS data collection is current to March 2020, when observations were halted because of the Coronavirus-induced lock-down. It will grow again with time as observations will resume, with future processing on a roughly monthly cadence. More details about the KMOS data and their structure are available in the associated Phase 3 data release description.

The KMOS data cubes tagged "KMOS" can be queried and downloaded using the Phase 3 generic query form which provides access to all Phase 3 data, or the Phase 3 spectral data query form with query parameters suited to harvest 3D cube data. KMOS data can be browsed and accessed via the ASP web interface or programmatically.


ESO Archive Talks @EAS2020

Archive Science Group 3 months ago updated 3 months ago 0

During the European week of Astronomy 2020 the ESO Archive Science Group presented the new possibilities of the ESO archive in two contributed talks as part of the session SS18a - Scientific use of the spectroscopic archive in the long-term future. The videos of the two talks will be available online on the conference web-site until the end of July 2020 (search for Laura Mascetti and Emanuele Paolo Farina), but you will be able to find the presentations in pdf format here:


Feeding the ESO archive via Phase 3: ensuring long term availability and legacy value of spectral products

The ESO archive is a powerful scientific resource for the astronomical community. It stores more than forty years of raw data generated by all ESO instruments, as well as the corresponding science-ready products and catalogues. Spectroscopic products from surveys and instruments like MUSE, UVES, XSHOOTER, FLAMES/GIRAFFE, HARPS and FEROS are regularly ingested and published. All spectra are stored in an homogeneous, VO-compliant format defined in the Phase 3 standard and are released together with an extended documentation, their release description. The aim of this presentation is to show how an homogeneous and well characterized archive content allows to build enhance functionalities for data discovery and exploitation. I will conclude presenting how the ESO archive is coping with the relentlessly increase in volume and complexity of the archive holdings, focusing on the handling of data from the new multi-object spectrograph 4MOST.


Cross validating new surveys with 40 years ESO archival spectra

The ESO Archive currently contains half a million images, two millions spectra and more than ten thousands datacubes. This incredible dataset is publicly available for data mining for a variety of scientific purposes, ranging from the local Universe to the first object emerging from the cosmic dark ages.
As an example, by selecting a sub-sample of high quality spectra collected with both MUSE and XSHOOTER, I will show how combining information coming from different instruments can shed new light on the properties of well known objects such as spectro-photometric standard stars.
In the near future, this approach would be fundamental to cross-validate the tens of millions of spectra foreseen to be collected with the 4MOST instrument on the ESO/VISTA telescope


Vista Magellanic Cloud Survey DR5.1: Incremental high level products released

Archive Science Group 4 months ago updated 4 months ago 0

The Vista Magellanic Cloud (VMC) Survey DR5.1 is now publicly available on the ESO Archive.

This incremental data release is based on observations acquired between February 2010 and October 2016 of 42 tiles encompassing the whole Small Magellanic Cloud (SMC), the Magellanic Bridge and the Magellanic Stream components of the survey. The total sky coverage is ~40 deg2 in the SMC, ~20 deg2 in the Bridge and ~3 deg2 in the Stream. This release adds reduced and calibrated deep products (co-added tile images and related single band catalogues), together with a multi-band (YJKs) aperture matched, epoch merged source catalogue for more than 14.6 million sources, three multi epoch single band catalogues, a catalogue of variable sources (39406 records) and a PSF photometry catalogue.

The data published within the VMC DR5.1 release are produced by the Wide Field Astronomy Unit (WFAU). More detailed information is available in the accompanying documentation.

Data can be browsed via the Science Portal or programmatically. Catalogues are also available, they can be queried conjointly via the query facility or TAP.