- ID:
- ivo://astron.nl/lotss_dr2/q/query_mosaics
- Title:
- LoTSS-DR2 mosaics
- Short Name:
- "Mosaics"
- Date:
- 28 Sep 2023 14:12:45
- Publisher:
- ASTRON
- Description:
- In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) we present 120-168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30′ and 1h00m +28°00′ and spanning 4178 and 1457 square degrees respectively. The images were derived from 3,451 hrs (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4,395,448 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6′′ resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 μ Jy/beam; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2′′; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy/beam. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit the error on the derived spectral index is > ±0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20′′ resolution 120-168 MHz continuum images have a median rms sensitivity of 95 μ Jy/beam, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8mJy/beam at 4′ and 2.2mJy/beam at 20′′; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset. This service queries the Stokes I continuum mosaic images.
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- ID:
- ivo://astron.nl/lofartier1/q_img/imgs
- Title:
- LoTSS-PDR Image Archive
- Short Name:
- LoTSS-PDR images
- Date:
- 28 Apr 2021 10:35:08
- Publisher:
- ASTRON
- Description:
- This service queries the catalog of images from the LOFAR HBA Tier-1 preliminary data release (LoTSS-PDR). This data release contains images and catalogs that characterise the low-frequency radio emission in the region of the HETDEX Spring Field. In excess of 40,000 sources are detected in the images that cover an area of over 350 square degrees, have a resolution of 25 arcsec, and typical noise levels of less than 0.5 mJy/beam.
- ID:
- ivo://astron.nl/lofartier1/q_img/cutout
- Title:
- LoTSS-PDR Image Cutout Service
- Short Name:
- LoTSS-PDR Cutout
- Date:
- 28 Apr 2021 10:35:08
- Publisher:
- ASTRON
- Description:
- This service provides cutouts from the images of the LOFAR HBA Tier-1 preliminary data release (LoTSS-PDR). This data release contains images and catalogs that characterise the low-frequency radio emission in the region of the HETDEX Spring Field. In excess of 40,000 sources are detected in the images that cover an area of over 350 square degrees, have a resolution of 25 arcsec, and typical noise levels of less than 0.5 mJy/beam.
- ID:
- ivo://CEFCA/minijpas/MINIJ-PAS-PDR201912
- Title:
- MINIJ-PAS PDR201912 Catalogue (December, 2019)
- Short Name:
- MINJPASPDR201912
- Date:
- 20 Sep 2023 06:30:00
- Publisher:
- Centro de Estudios de Física del Cosmos de Aragón (CEFCA)
- Description:
- MINIJ-PAS PDR201912 Catalogue (December, 2019) is based on scientific images in 60 filters covering a total area of ~1 square degree. MiniJ-PAS is a 60-band photometric optical survey based on images collected by the JST250 telescope and the Pathfinder instrument at the Observatorio Astrofísico de Javalambre (OAJ, Teruel, Spain) . Please include the following in any published material that makes use of this data: "Based on observations made with the JST250 telescope and PathFinder camera for Mini J-PAS project at the Observatorio Astrofísico de Javalambre, in Teruel, owned, managed and operated by the Centro de Estudios de Física del Cosmos de Aragón."
- ID:
- ivo://fai.kz/grb_photometry/q/i
- Title:
- Photometrical observations of GRB
- Short Name:
- grb siap
- Date:
- 10 Oct 2023 11:48:20
- Publisher:
- Fesenkov Astrophysical Institute
- Description:
- The database of Gamma Ray Burst (GRB) photometrical observations obtained on defferent telescopes at Fesenkov Astrophysical Institute, Almaty, Kazakhstan. Observations were carried out in the optical range.
- ID:
- ivo://org.gavo.dc/rosat/q/im
- Title:
- ROSAT Survey and Pointed Images
- Short Name:
- ROSAT images
- Date:
- 20 Apr 2023 00:06:45
- Publisher:
- The GAVO DC team
- Description:
- Images taken by the ROSAT x-ray observatory. This comprises both pointed observations and images taken within the all-sky survey.
- ID:
- ivo://org.gavo.dc/sasmirala/q/im
- Title:
- Sasmirala Subarcsecond mid-infrared atlas of local AGN
- Short Name:
- sasmirala atlas
- Date:
- 23 Mar 2022 13:13:11
- Publisher:
- The GAVO DC team
- Description:
- These FITS images were generated with the IDL package MIRphot [Asmus2014]_ by extraction (and combination) of the sub-images from the chopped/nodded total images from COMICS, Michelle, T-ReCS and VISIR (see [Asmus2014]_ for details). The FITS images contain the central ~4 arcsec of each source centered on the (putative) nuclear position with North being up and East to the left. The WCS registration has been performed after extraction by using coordinates of the nucleus from other wavelengths (mostly 2MASS and NED). The uncertainty of these reference position is usually less than 1 arcsec. In addition, the imprecision of the assignment itself is ~1px ~ 0.1". The FITS images are flux calibrated (unit is mJy) using the Gaussian 2D fits to the corresponding STD observation (where available, otherwise using the median conversion factor for the used instrument/filter settings). Therefore, correction factors have to be applied in case other flux measurement methods are applied to the images. The flux values given in the FITS headers should be regarded as approximate values. In particular for the instruments, VISIR and COMICS, they are not necessarily exactly equal to the values provided in the photometry results table, because many flux measurements were performed during the process of combining individual subimages (all in MIRphot), instead of in the final combined image, provided here. The used total images are available upon request. Note, however, that these are just the products of the observatory-delivered pipelines with default parameters. .. [Asmus2014] Asmus D., Hoenig S.F., Gandhi P., Smette A., Duschl W.: The subarcsecond mid-infrared view of local active galactic nuclei: I. The N- and Q-band imaging atlas, `2014MNRAS.439.1648A <http://ads.ari.uni-heidelberg.de/abs/2014MNRAS.439.1648A>`_
- ID:
- ivo://chivo/alma_fits/q/siap-alma-fits
- Title:
- Simple Image Access for ALMA FITS
- Short Name:
- SIAP ALMA FITS
- Date:
- 06 Nov 2017 14:35:31
- Publisher:
- ChiVO
- Description:
- The resource contains the recommendations and requirements for ALMA FITS products of the Inter-ARC ALMA Science Archive Working Group (ASAWG) with the view to including a metadataset that is complete and easily accessible by the ChiVO Data Provider (CDP).
- ID:
- ivo://org.gavo.dc/smakced/q/im
- Title:
- SMAKCED H-band images of Early-Type Virgo Dwarf Galaxies
- Short Name:
- smakced H images
- Date:
- 23 Mar 2022 13:13:18
- Publisher:
- The GAVO DC team
- Description:
- The Stellar content, MAss and Kinematics of Cluster Early-type Dwarf galaxies (SMAKCED_) project is a survey of 121 Virgo cluster early type galaxies. This service publishes deep near-infrared (H band) images obtained by SMAKCED together with `resulting decompositions`_ and other properties of the galaxies in the sample. .. _SMAKCED: http://smakced.net .. _resulting decompositions: http://smakced.net/data.html
- ID:
- ivo://padc.obspm.astro/srcj/q/i
- Title:
- SRC-J survey digitized by MAMA
- Short Name:
- POSSE
- Date:
- 07 Apr 2022 17:22:05
- Publisher:
- Paris Astronomical Data Centre
- Description:
- Pallomar Observatory plate scan service
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