<?xml version='1.0'?><?xml-stylesheet href='/static/xsl/oai.xsl' type='text/xsl'?><ri:Resource created="2017-11-28T10:50:00Z" status="active" updated="2024-12-27T08:31:13Z" version="1.2" xmlns:g-colstat="http://dc.g-vo.org/ColStats-1" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:ssap="http://www.ivoa.net/xml/SSA/v1.1" xmlns:vg="http://www.ivoa.net/xml/VORegistry/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://dc.g-vo.org/ColStats-1 http://vo.ari.uni-heidelberg.de/docs/schemata/Colstats.xsd http://www.ivoa.net/xml/RegistryInterface/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/RegistryInterface.xsd http://www.ivoa.net/xml/SSA/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/SSA.xsd http://www.ivoa.net/xml/VORegistry/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VORegistry.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>Digitized First Byurakan Survey (DFBS) Spectra Query Service</title><shortName>DFBS SSAP</shortName><identifier>ivo://org.gavo.dc/dfbsspec/q/getssa</identifier><curation><publisher>The GAVO DC team</publisher><creator><name>Markarian, B.E.</name></creator><date role="Updated">2026-01-15T14:30:24Z</date><contact><name>GAVO Data Centre Team</name><address>Mönchhofstrasse 12-14, D-69120 Heidelberg</address><email>gavo@ari.uni-heidelberg.de</email><telephone>+49 6221 54 1837</telephone></contact></curation><content><subject>spectroscopy</subject><subject>surveys</subject><subject>active-galactic-nuclei</subject><subject>schmidt-cameras</subject><description>
The First Byurakan Survey (FBS) is the largest and the first systematic
objective prism survey of the extragalactic sky. It covers 17,000 sq.deg.
in the Northern sky together with a high galactic latitudes region in the
Southern sky. The FBS has been carried out by B.E. Markarian, V.A.
Lipovetski and J.A. Stepanian in 1965-1980 with the Byurakan Observatory
102/132/213 cm (40"/52"/84") Schmidt telescope using 1.5 deg. prism. Each
FBS plate contains low-dispersion spectra of some 15,000-20,000 objects;
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114 120-122 196-198 204 206-207 222-223 242-243 410 428-430 432-434
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776-778 857 859 877 879 881-883 984-985 987-989 991 1013-1015 1076
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48913-48915 48929-48931 49064-49065 49067</spatial><temporal>39165 44374</temporal><spectral>2.879e-19 6.355e-19</spectral><footprint ivo-id="ivo://ivoa.net/std/moc">https://dc.g-vo.org/dfbsspec/q/getssa/coverage</footprint><waveband>Optical</waveband></coverage><tableset><schema><name>ivoa</name><description>Definition and support code for the ObsCore data model and table.</description><table><name>ivoa.obscore</name><description>This data collection is queryable in GAVO Data Center's obscore table.</description></table></schema><schema><name>dfbsspec</name><title>Digitized First Byurakan Survey (DFBS) Extracted Spectra</title><description>
The First Byurakan Survey (FBS) is the largest and the first systematic
objective prism survey of the extragalactic sky. It covers 17,000 sq.deg.
in the Northern sky together with a high galactic latitudes region in the
Southern sky. The FBS has been carried out by B.E. Markarian, V.A.
Lipovetski and J.A. Stepanian in 1965-1980 with the Byurakan Observatory
102/132/213 cm (40"/52"/84") Schmidt telescope using 1.5 deg. prism. Each
FBS plate contains low-dispersion spectra of some 15,000-20,000 objects;
the whole survey consists of about 20,000,000 objects.</description><table><name>dfbsspec.ssa</name><description>A view providing standard SSA metadata for DBFS metadata in
dfbsspec.spectra</description><nrows>23213283</nrows><column><name>accref</name><description>Access key for the data</description><ucd>meta.ref.url;meta.dataset</ucd><utype>ssa:Access.Reference</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>owner</name><description>Owner of the data</description><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>embargo</name><description>Date the data will become/became public</description><unit>yr</unit><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>mime</name><description>MIME type of the file served</description><ucd>meta.code.mime</ucd><utype>ssa:Access.Format</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>accsize</name><description>Size of the data in bytes</description><unit>byte</unit><utype>ssa:Access.Size</utype><dataType xsi:type="vs:VOTableType">long</dataType><flag>nullable</flag></column><column><name>ssa_dstitle</name><description>A compact and descriptive designation of the dataset.</description><ucd>meta.title;meta.dataset</ucd><utype>ssa:DataID.Title</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType></column><column><name>ssa_creatordid</name><description>Dataset identifier assigned by the creator</description><ucd>meta.id</ucd><utype>ssa:DataID.CreatorDID</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_pubdid</name><description>Dataset identifier assigned by the publisher</description><ucd>meta.ref.ivoid</ucd><utype>ssa:Curation.PublisherDID</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>ssa_cdate</name><description>Processing/Creation date</description><ucd>time;meta.dataset</ucd><utype>ssa:DataID.Date</utype><dataType arraysize="19" extendedType="timestamp" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_pdate</name><description>Date last published.</description><utype>ssa:Curation.Date</utype><dataType arraysize="19" extendedType="timestamp" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_bandpass</name><description>Bandpass (i.e., rough spectral location) of this dataset; this should be the most appropriate term from the vocabulary http://www.ivoa.net/rdf/messenger.</description><ucd>instr.bandpass</ucd><utype>ssa:DataID.Bandpass</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_cversion</name><description>Creator assigned version for this dataset (will be incremented when this particular item is changed).</description><ucd>meta.version;meta.dataset</ucd><utype>ssa:DataID.Version</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_targname</name><description>Common name of object observed.</description><ucd>meta.id;src</ucd><utype>ssa:Target.Name</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>indexed</flag></column><column><name>ssa_targclass</name><description>Object class (star, QSO,...; use Simbad object classification http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes if at all possible)</description><ucd>src.class</ucd><utype>ssa:Target.Class</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_redshift</name><description>Redshift of target object</description><ucd>src.redshift</ucd><utype>ssa:Target.Redshift</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_targetpos</name><description>Equatorial (ICRS) position of the target object.</description><ucd>pos.eq;src</ucd><utype>ssa:Target.pos.spoint</utype><dataType arraysize="2" extendedType="point" xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>ssa_snr</name><description>Signal-to-noise ratio estimated for this dataset</description><ucd>stat.snr</ucd><utype>ssa:Derived.SNR</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_location</name><description>ICRS location of aperture center</description><unit>deg</unit><ucd>pos.eq</ucd><utype>ssa:Char.SpatialAxis.Coverage.Location.Value</utype><dataType arraysize="2" extendedType="point" xsi:type="vs:VOTableType">double</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>ssa_aperture</name><description>Angular diameter of aperture</description><unit>deg</unit><ucd>phys.angSize;instr.fov</ucd><utype>ssa:Char.SpatialAxis.Coverage.Bounds.Extent</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_dateobs</name><description>Midpoint of exposure (MJD)</description><unit>d</unit><ucd>time.epoch</ucd><utype>ssa:Char.TimeAxis.Coverage.Location.Value</utype><dataType xsi:type="vs:VOTableType">double</dataType><flag>nullable</flag></column><column><name>ssa_timeext</name><description>Exposure duration</description><unit>s</unit><ucd>time.duration</ucd><utype>ssa:Char.TimeAxis.Coverage.Bounds.Extent</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_specmid</name><description>Midpoint of region covered in this dataset</description><unit>m</unit><ucd>instr.bandpass</ucd><utype>ssa:Char.SpectralAxis.Coverage.Location.Value</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_specext</name><description>Width of the spectrum</description><unit>m</unit><ucd>instr.bandwidth</ucd><utype>ssa:Char.SpectralAxis.Coverage.Bounds.Extent</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_specstart</name><description>Lower value of spectral coordinate</description><unit>m</unit><ucd>em.wl;stat.min</ucd><utype>ssa:Char.SpectralAxis.Coverage.Bounds.Start</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_specend</name><description>Upper value of spectral coordinate</description><unit>m</unit><ucd>em.wl;stat.max</ucd><utype>ssa:Char.SpectralAxis.Coverage.Bounds.Stop</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_length</name><description>Number of points in the spectrum</description><utype>ssa:Dataset.Length</utype><dataType xsi:type="vs:VOTableType">int</dataType><flag>nullable</flag></column><column><name>ssa_dstype</name><description>Type of data (spectrum, time series, etc)</description><utype>ssa:Dataset.Type</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_publisher</name><description>Publisher of the datasets included here.</description><ucd>meta.curation</ucd><utype>ssa:Curation.Publisher</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_creator</name><description>Creator of the datasets included here.</description><utype>ssa:DataID.Creator</utype><dataType arraysize="*" xsi:type="vs:VOTableType">unicodeChar</dataType><flag>nullable</flag></column><column><name>ssa_collection</name><description>A short handle naming the collection this spectrum belongs to.</description><utype>ssa:DataID.Collection</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_instrument</name><description>Instrument or code used to produce these datasets</description><ucd>meta.id;instr</ucd><utype>ssa:DataID.Instrument</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_datasource</name><description>Method of generation for the data (one of survey, pointed, theory, custom, artificial).</description><utype>ssa:DataID.DataSource</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_creationtype</name><description>Process used to produce the data (archival, cutout, filtered, mosaic, projection, spectralExtraction, or catalogExtraction)</description><utype>ssa:DataID.CreationType</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_reference</name><description>URL or bibcode of a publication describing this data.</description><ucd>meta.bib.bibcode</ucd><utype>ssa:Curation.Reference</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_fluxstaterror</name><description>Statistical error in flux</description><ucd>stat.error;phot.flux.density;em</ucd><utype>ssa:Char.FluxAxis.Accuracy.StatError</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_fluxsyserror</name><description>Systematic error in flux</description><ucd>stat.error.sys;phot.flux.density;em</ucd><utype>ssa:Char.FluxAxis.Accuracy.SysError</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_fluxcalib</name><description>Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED).</description><utype>ssa:Char.FluxAxis.Calibration</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_binsize</name><description>Bin size in wavelength</description><unit>m</unit><ucd>em.wl;spect.binSize</ucd><utype>ssa:Char.SpectralAxis.Accuracy.BinSize</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_spectstaterror</name><description>Statistical error in wavelength</description><unit>m</unit><ucd>stat.error;em</ucd><utype>ssa:Char.SpectralAxis.Accuracy.StatError</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_spectsyserror</name><description>Systematic error in wavelength</description><unit>m</unit><ucd>stat.error.sys;em</ucd><utype>ssa:Char.SpectralAxis.Accuracy.SysError</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_speccalib</name><description>Type of wavelength calibration</description><ucd>meta.code.qual</ucd><utype>ssa:Char.SpectralAxis.Calibration</utype><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>nullable</flag></column><column><name>ssa_specres</name><description>Resolution (in meters of wavelength) on the spectral axis</description><unit>m</unit><ucd>spect.resolution;em.wl</ucd><utype>ssa:Char.SpectralAxis.Resolution</utype><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>ssa_region</name><description>Rough coverage based on location and aperture.</description><ucd>pos.outline;obs.field</ucd><dataType arraysize="*" extendedType="polygon" xsi:type="vs:VOTableType">double</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>magb</name><description>Source object magnitude in Johnson B</description><unit>mag</unit><ucd>phot.mag;em.opt.B</ucd><stats><min>0.92</min><percentile03>12.67</percentile03><median>15.78</median><percentile97>18.11</percentile97><max>29.76</max><fillFactor>1</fillFactor></stats><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>magr</name><description>Source object magnitude in Johnson R</description><unit>mag</unit><ucd>phot.mag;em.opt.R</ucd><stats><min>-11.86</min><percentile03>11.95</percentile03><median>15.01</median><percentile97>17.38</percentile97><max>34.03</max><fillFactor>1</fillFactor></stats><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>plate</name><description>Number of the plate this spectrum was extracted from. Technically, this is a foreign key into dfbs.plates.</description><dataType arraysize="*" xsi:type="vs:VOTableType">char</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>ra</name><description>ICRS RA of the source of this spectrum.</description><unit>deg</unit><ucd>pos.eq.ra;meta.main</ucd><stats><min>0</min><percentile03>8.92942</percentile03><median>174.657</median><percentile97>352.227</percentile97><max>360</max><fillFactor>1</fillFactor></stats><dataType xsi:type="vs:VOTableType">double</dataType><flag>indexed</flag><flag>nullable</flag></column><column><name>dec</name><description>ICRS Dec of the source of this spectrum.</description><unit>deg</unit><ucd>pos.eq.dec;meta.main</ucd><stats><min>-22.9211</min><percentile03>-10.7547</percentile03><median>25.6107</median><percentile97>77.8013</percentile97><max>89.9629</max><fillFactor>1</fillFactor></stats><dataType xsi:type="vs:VOTableType">double</dataType><flag>indexed</flag><flag>nullable</flag></column></table></schema></tableset></ri:Resource>