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 from all users are encouraged, also without registration.

To participate in the knowledge exchange, please choose an appropriate Forum from the right panel or from the drop-down menu on the top of this page and write a message. An agent from the ESO Archive Science Group (ASG) will receive, moderated it, and make it public as soon as possible.

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The ESO Archive Community Forum also provides help pages about the data access and retrieval, and about the data types used in the ESO Archive.

Please be aware that the channel to receive help concerning data access, data reduction and pipelines, and quality of products is provided by the ESO helpdesk.

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


New spectra, images, and transient catalog of the PESSTO public survey (DR4)

Archive Science Group 4 weeks ago 0


A new release of the Public ESO Spectroscopic Survey for Transient Objects (PESSTO) is available, including spectra and images from its ePESSTO extension, and the delivery of a new transient catalogue, globally covering 7 years of observations, from April 2012 to April 2019, for a total of 45GB.

This new release brings to 2323 the number of observed supernovae and optical transients, with calibrated 1D spectra for 2314 of them, doubling the number of objects previously published (1168 in the previous version). Also doubled is the number of selected key targets (now 337) that were scheduled for follow-up time-series EFOSC2 optical spectroscopy, so to monitor the supernovae at the extremes of the known population e.g. the most luminous, the faintest, the fast declining, etc. The total number of spectra for the key targets is 3748, including the SOFI spectra taken for the brightest ones. SOFI imaging (broad-band JHKs) was nearly always taken when SOFI near infra-red spectra were taken.

Data are available via the ESO Science Portal or programmatically. For more details on the observing strategy, the data reduction, calibration, and quality, along with a table of the selected key targets, and the description of the catalogue, please refer to the comprehensive release description.

Note: an updated version of the PESSTO multi-epoch photometry catalogue published in DR3.1 is expected by the summer.


First data released from the project: 'Investigating stellar population in relics (INSPIRE)'

Archive Science Group 1 month ago updated 1 month ago 0


The INSPIRE project is an ESO Large Programme (ID: 1104.B- 0370, PI: C. Spiniello) which uses X-Shooter (in UVB, VIS, NIR band) to spectroscopically follow up 52 red ultra Compact Massive Galaxies selected from the KiDS VST ESO Public Survey.

The goals of INSPIRE (Spiniello et al. 2021a, Spiniello et al. 2021b) is to obtain the first catalogue of spectroscopically confirmed relics in the redshift range 0.1<z<0.5, bridge the gap between the three local confirmed relics and the high-z red nuggets, use the final statistic on confirmed relics to put a stringent constraint on the predictions from simulations on the initial burst of star formation in galaxies.

This first release provides 76 1D spectra for 19 galaxies whose observations were completed. For each galaxy, there are four 1D spectra products: two UVB spectra and two VIS. For each object, the two pairs in each arm are extracted using either an aperture that includes 50% of the light or with an optimal extraction procedure on the entire slit. Together with the extracted 1D spectra, the combined UVB+VIS spectra, restframed and smoothed to a final resolution of FWHM = 2.52 Ang. are also published as ancillary files (these products were used for the stellar population analysis in S21b). The products contain measurements like redshift, stellar age and metallicity from the spectra in dedicated header keywords, which are listed in the detailed release description together with more details about the released products. The 1D spectra for the NIR arms and a comprehensive catalogue of the galaxies proprieties will be included in a future release.

Data are available via the ESO Science Portal or programmatically.


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

Archive Science Group 7 months ago updated 1 month 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.


Second data release of the VISTA EXtension to Auxiliary Surveys (VEXAS)

Archive Science Group 1 month ago updated 1 month ago 1


The VISTA EXtension to Auxiliary Surveys (VEXAS, Spiniello & Agnello, 2019) project aims at building wide and spatially homogeneous multi-wavelength catalogues (from X-ray to radio) providing reference magnitudes, colors and morphological information for a large number of scientific uses. Currently the VEXAS catalogue is the widest and deepest public optical-to-IR photometric and spectroscopic database in the Southern Hemisphere, comprising more than 90 million objects with reliable photometry measured in at least one of the VISTA infrared bands, two of the WISE bands and three optical bands.

This second release provides a new version of the three VEXAS DR1 optical+infrared tables: VEXAS-DESW, VEXAS-PSW and VEXAS-SMW in which sources fainter than 25 mag have been removed and additional quality improvements were applied. Objects are now classified into stars, galaxies and quasars using an ensemble of thirty-two different machine learning models, based on three different algorithms and on different magnitude sets, training samples and classification problems (two or three classes). A new version of the spectroscopic table is also

provided. In order to build a training sample as large as possible and as complete and clean as possible in all the three classes of objects, on top of SDSS, 5 additional surveys have been used in this new version (SDSS DR16, Ahumada et al. 2019; WiggleZ, Drinkwater et al. 2018; GAMA DR3 Baldry et al. 2018; OzDES, Childress et al. 2017; 2QZ, Croom et al. 2004; and 6dFFS DR3, Jones et al. 2009) to which strict selection criteria have been applied. The machine learning pipeline and main results on the classification are described in detail in Khramtsov et al. (2021).

Detailed information are available in the accompanying release documentation. The tables are linked to the primary one and can be queried together via the ESO Catalogue Query Interface or programmatically.


New version of the ESO Science Data Products Standard (V7)

Archive Science Group 2 months ago updated 2 months ago 0


The version 7 of the ESO Science Data Products Standard is now published! This document is the reference for users on how to prepare their data for the submission through Phase 3. Highlights of the revision are:

  • A new data format was introduced for single image products. It allows additional ways of packaging weightmap, background, etc in extensions and will support future science data products from future VLT NIR imagers , e.g., ERIS.
  • White-light images associated with IFS cubes must now be identified with a unique product category.
  • In case of moving objects, more instructions are given on how to set up the source identifier.
  • Vector-valued fields are supported for catalogue data. There is a maximum limit of 1500 elements for these vectors.

For more detailed information, please consult the change record from the previous version, which is available in the document. The new version of the Science Data Products standard can be downloaded as PDF document. The Phase 3 validation rules are currently being aligned with the SDP standard version 7. A summary of the implemented checks is available here.


Fourth - and final - data release of the Spectroscopic Public Survey VANDELS

Archive Science Group 3 months ago 0


The fourth and final data release of the deep VIMOS survey of the CANDELS UDS and CDFS fields, VANDELS, is now available in the ESO Science Archive Facility.

The VANDELS survey (Programme id 194.A-2003, PI L. Pentericci and R. McLure) started data acquisition in November 2014 and was completed in March 2018 before the VIMOS decommissioning. It delivers high signal-to-noise (range: 10-100), medium resolution (R~600) optical spectra (4800-10000Å) for galaxies in the UKIDSS Ultra Deep Survey (UDS) and Chandra Deep Field South (CDFS) survey fields. The total area covered is 0.2degree2.

Using robust photometric redshift pre-selection, VANDELS targeted ≈2100 galaxies in the redshift interval 1.0<z<7.0, with 85% of its targets selected to be at z≥3. VANDELS also targeted a substantial number of passive galaxies in the redshift interval 1.0<z<2.5. The magnitude range of the sample is HAB<24mag for star-forming galaxies in the redshift interval 2.5<z<5.5, HAB<27mag for Lyman-break galaxies (LBGs) in the redshift interval 3.0<z<7.0, and HAB<22.5mag for passive galaxies at redshifts 1.5<z<2.5.

Each target received between a minimum of 20 hours and a maximum of 80 hours of on-source integration time. The legacy of VANDELS consists of determining the key physical properties of high redshift galaxies such as their stellar population ages, metallicities and outflow velocities from detailed absorption-line studies.

This fourth data release consists of 2165 spectra (downloadable via the ESO Science Portal or programmatically), 1061 spectra in CDFS and 1104 in UDS field, respectively. DR4 totally replaces all products released in DR3 because of the new flux correction applied in the blue wavelength. In addition, DR4 provides 287 new spectra and 104 spectra of serendipitously observed objects.

In addition to the 1D spectrum products, this final release contains also the catalogue with spectroscopic redshifts and the derived physical properties for each galaxy. The catalogue can be queried via the Catalog Facility or TAP.

More information about the release content can be found in the accompanying documentation and in Garilli et al. (2021).


First Data Release from the VST survey of Early-type GAlaxieS (VEGAS)

Archive Science Group 3 months ago updated 3 months ago 0


VEGAS is a deep multi-band (u'g'r'i') imaging survey of bright (MB<-21mag) early-type galaxies in the local volume within 54 Mpc/h carried out with OmegaCam on the VLT Survey Telescope (VST, Capaccioli et al., 2005; see also the VEGAS website). Observations are based on the VST Guaranteed Time Observation assigned to the Italian National Institute for Astrophysics under programme ID runs: 089.B-0607(A), 090.B-0414(B,D), 091.B-0614(A), 092.B-0623(B,C,D), 094.B-0496(D), 095.B-0779(A), 096.B-0582(B), 097.B-0806(A,B), 098.B-0208(A), 099.B-0560(A), and 0100.B-0168(A).

This first date release publishes multi-band data for 10 fields, each of them covering a main galaxy and its close environment out to about 8-10 effective radii. The wide field of view, the long integration (ranging from 0.5 to 6.5 hours), and the high angular resolution of 0.21'' pixel-1 delivered by VST allow the light distribution to be mapped down to a surface brightness level of ~29 mag arcsec-2 in g'-band. These 23 science images (and corresponding weight maps) covering an area of ~42 deg² are now available to the ESO community via the ESO Science Portal and programmatically. The total data volume is ~30Gb.

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


High-Resolution MUSE data of the inner region of NGC 7130 released

Archive Science Group 4 months ago updated 4 months ago 0

The Seyfert starburst galaxy NGC 7130 was targeted for commissioning and science verification of the MUSE Narrow Field Mode, in programmes 60.A-9100(K) and 60.A-9493(A), P.I. Marja Seidel. The reduced data cube provides an angular resolution of 0.17 arcsec across a field of view of 7.5x7.5 arcsec2 covering the spectral range between 4750 and 9300 Å with a resolution of about 2.5 to 2.7 Å. First, the data was processed using the standard ESO pipeline, then individual exposures were selected, manually aligned and combined into the final data cube for a total of 2100 seconds exposure time. This provides an equivalent white-light point source sensitivity of 22.4 mag AB (at 5 sigma). The data with its associated white light image is available from the ESO Science Portal or programmatically.

Details on the observing programme and the data processing can be found in the data release documentation and in the associated publication Comerón et al. (2021, accepted in A&A, arXiv:2011.02937).


New data release (DR4) from the Gaia-ESO Spectroscopic Public Survey

Archive Science Group 4 months ago 0

The new data release from the Gaia-ESO Public Spectroscopic Survey (GES) DR4 delivers about 190,000 stacked, quality-controlled, 1-d spectra (R between 18000 and 54000) of 114,500 unique stellar targets. These stars were observed with GIRAFFE and UVES from 31.12.2011 to 26.01.2018, during the entire time execution of the survey. These targets were selected from all the major structural components of the Milky Way: bulge, thick and thin discs, halo, including open star clusters of all ages and masses. The 1-D spectra from GES DR4 augment or update the spectra published in the previous data releases, which included observations up to July 2014 (~44000 spectra for ~25000 objects).

A catalog of radial velocities is being finalized and will be released in the subsequent data release (DR4.1), together with the 1D stacked spectra for additional ~600 unique targets. The final data release from the Gaia-ESO survey containing the catalog with the measured stellar parameters will be released later in 2021.

The total volume of GES DR4 is 32 GB. These data are available via the Science Portal, and programmatically. More information is available in the accompanying release documentation. Instructions on how to read or display data in the ESO Science Data Products tabular data format can be found in the 1D spectrum data format help page.

Related external resources: Gaia-ESO home page


Second Data Release from the Galaxy Clusters At Vircam (GCAV) ESO VISTA Public Survey

Archive Science Group 4 months ago updated 4 months ago 0

Galaxy Clusters At Vircam (GCAV) is a survey (programme 198.A-2008, PI M. Nonino) belonging to the second cycle of ESO VISTA Public Surveys. It is aimed at observing 20 massive galaxy clusters covering in total ~30 deg2 in the infrared Y, J, and Ks bands. Those clusters have also been observed in many ground- and space-based programmes (e.g. CLASH, RELICS, HFF/ BUFFALO). The survey will mainly explore galaxy evolution over a wide, and still largely unexplored, diversity of cluster environments.

This second release adds new data of 15 galaxy clusters to the previous DR1. It contains tile images and related source lists from data collected over the time period from October 2016 to March 2020. The tile images reach a typical sensitivity in AB magnitude of ~23.5 in Y, ~23.4 in J, and ~22.4 in Ks. The total volume of the second data release is 1.3TB.

All data are publicly accessible via the Science Portal or programmatically. More information is available in the accompanying release documentation.