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<ri:Resource created="2014-03-18T08:00:24Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/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://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.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>Catalog of X-ray selected BL Lac objects</title><shortName>J/AJ/145/31</shortName><identifier>ivo://CDS.VizieR/J/AJ/145/31</identifier><altIdentifier>doi:10.26093/cds/vizier.51450031</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Kapanadze B.Z.</name></creator><date role="Updated">2017-11-10T11:15:45Z</date><date role="Created">2014-03-18T08:00:24Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>bl-lacertae-objects</subject><subject>x-ray-sources</subject><subject>active-galactic-nuclei</subject><subject>redshifted</subject><subject>infrared-photometry</subject><subject>visible-astronomy</subject><subject>broad-band-photometry</subject><subject>absolute-magnitude</subject><description>This paper presents a catalog of 312 X-ray selected BL Lacertae objects (XBLs), optically identified through the end of 2011. It contains the names from different surveys, equatorial coordinates, redshifts, multifrequency flux values, and luminosities for each source. In addition, the different characteristics of XBLs are statistically investigated (redshift, radio/optical/X-ray luminosities, central black hole (BH) mass, synchrotron peak frequency, broadband spectral indices, optical flux variability). Their values are collected through an extensive bibliographic and database search or calculated by us. The redshifts range from 0.031 to 0.702 with a maximum of the distribution at z=0.223. The 1.4GHz luminosities of XBLs log{nu}L_{nu}_~39-42erg/s while optical V and X-ray 0.1-2.4keV bands show log{nu}L_{nu}_~43-46erg/s. The XBL hosts are elliptical galaxies with effective radii r_eff_=3.26-25.40kpc and ellipticities, {epsilon}=0.04-0.52. Their R-band absolute magnitudes M_R_ range from -21.11mag to -24.86mag with a mean value of -22.83mag. The V-R indices of the hosts span from 0.61 to 1.52 and reveal a fourth-degree polynomial relationship with z that enables us to evaluate the redshifts of five sources whose V-R indices were determined from the observations but whose redshifts values are either not found or not confirmed. The XBL nuclei show a wider range of 7.31mag for M_R_ with the highest luminosity corresponding to M_R_=-27.24mag. The masses of central BHs are found in the interval logM_BH_=7.39-9.30 solar masses (with distribution maximum at logM_BH_/M_{sun}_=8.30). The synchrotron peak frequencies are spread over the range log{nu}_peak_=14.56-19.18Hz with a peak of the distribution at log{nu}_peak_=16.60Hz. The broadband radio-to-optical ({alpha}_ro_), optical-to-X-ray ({alpha}_ox_), and radio-to-X-ray ({alpha}_rx_) spectral indices are distributed in the intervals (0.17,0.59), (0.56,1.48), and (0.41,0.75), respectively. In the optical energy range, the overall flux variability increases, on average, towards shorter wavelengths: &lt;{Delta}m&gt;=1.22,1.50, and 1.82mag through the R, V, B bands of Johnson-Cousins system, respectively. XBLs seem be optically less variable at the intranight timescales compared to the radio-selected BL Lacs (RBLs).</description><source format="bibcode">2013AJ....145...31K</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/145/31</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/IX/31">IX/31 : The WGACAT version of ROSAT sources (White+ 2000)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/IX/32">IX/32 : ROSAT Bright Survey (Fischer+, 1998-2000)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/IX/10">IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/IX/15">IX/15 : Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VII/172">VII/172 : First Byurakan Survey (FBS) (Markarian+, 1989)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/VII/80">VII/80 : The HEAO A-1 X-Ray Source Catalog (Wood+, 1984)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJ/716/30">J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/495/691">J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/445/441">J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/434/385">J/A+A/434/385 : X-ray/radio data of high energy peaked BL Lacs (Giommi+, 2005)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/428/383">J/A+A/428/383 : XMM-Newton Bright Serendipitous Survey (Della Ceca+, 2004)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/401/927">J/A+A/401/927 : The HRX-BL Lac sample (Beckmann+, 2003)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/406/L9">J/A+A/406/L9 : TeV Gamma-Rays from 1ES1959+650 (Aharonian+, 2003)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/ApJS/117/319">J/ApJS/117/319 : Northern RASS X-ray sources catalog (Appenzeller+ 1998)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/335/467">J/A+A/335/467 : High galactic latitude RASS X-ray sources (Thomas+ 1998)</relatedResource><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/323/739">J/A+A/323/739 : ROSAT detected quasars. 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The (V-R) color index of the XBL host (1)</description><unit>mag</unit><ucd>phot.color;em.opt.V;em.opt.R</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>u_V-R</name><description>[:] Uncertainty flag on V-R</description><ucd>meta.code.error;phot.color;em.opt.V</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>r_V-R</name><description>Reference for V-R; in refs.dat file</description><ucd>meta.ref;phot.color;em.opt.V</ucd><dataType xsi:type="vs:VOTableType" arraysize="3*">char</dataType></column><column><name>Ell</name><description>? Ellipticity of the XBL host (1)</description><ucd>src.ellipticity</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Rmag2</name><description>? Apparent R-band magnitude of the XBL nuclei (1)</description><unit>mag</unit><ucd>phot.mag;em.opt.R</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>l_RMag2</name><description>[&lt;&gt;] Limit flag on RMag2</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>RMag2</name><description>? Absolute R-band magnitude of the XBL nuclei (1)</description><unit>mag</unit><ucd>phys.magAbs</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>u_RMag2</name><description>[:] Uncertainty flag on RMag2</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>r_RMag2</name><description>Reference for RMag2; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="2*">char</dataType></column><column><name>l_LN/LH</name><description>[&lt;&gt;] Limit flag on LN/LH</description><ucd>meta.code.error;phys.abund</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>LN/LH</name><description>[0.02/332]? The nucleus-to-host luminosity ratio of the XBL nuclei (1)</description><ucd>phys.luminosity;arith.ratio</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>u_LN/LH</name><description>[:] Uncertainty flag on LN/LH</description><ucd>meta.code.error;phys.abund</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>Mb/Ms</name><description>? Log of the central black hole-to-Sun mass ratio</description><ucd>phys.mass;arith.ratio</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>u_Mb/Ms</name><description>[:] Uncertainty flag on Mb/Ms</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>r_Mb/Ms</name><description>Reference for Mb/Ms; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column><column><name>r_Rmag2</name><description>Reference for Rmag2; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column></table><table><name>J/AJ/145/31/table7</name><description>Synchrotron peak frequencies and broadband spectral indices</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Name</name><description>Source name from X-ray surveys (G2)</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="21*">char</dataType></column><column><name>OName</name><description>Other(s) name(s) from X-ray surveys (G2)</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="31*">char</dataType></column><column><name>lognu</name><description>Log of synchrotron peak frequency ({nu}_peak_) (1)</description><unit>log(Hz)</unit><ucd>em.freq</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>r_lognu</name><description>Reference of lognu; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="3*">char</dataType></column><column><name>aRO</name><description>? Radio-Optical spectral index ({alpha}_RO_)</description><ucd>spect.index</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>aOX</name><description>? Optical-X-ray spectral index ({alpha}_OX_)</description><ucd>spect.index</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>r_aOX</name><description>Reference of aRO and aOX; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column><column><name>aRX</name><description>? Radio-X-ray spectral index ({alpha}_RX_)</description><ucd>spect.index</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>r_aRX</name><description>Reference of aRX; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column></table><table><name>J/AJ/145/31/refs</name><description>References</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Ref</name><description>Reference code</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>BibCode</name><description>Bibliographic code</description><ucd>meta.bib.bibcode</ucd><dataType xsi:type="vs:VOTableType" arraysize="19*">char</dataType></column><column><name>Aut</name><description>Author's name</description><ucd>meta.bib.author</ucd><dataType xsi:type="vs:VOTableType" arraysize="22*">char</dataType></column><column><name>Com</name><description>Comments</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="97*">char</dataType></column></table><table><name>J/AJ/145/31/table9</name><description>Overall variability of X-ray-selected BL Lac objects (XBLs) in different spectral bands</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Name</name><description>Source name from X-ray surveys (G2)</description><ucd>meta.id;meta.main</ucd><dataType xsi:type="vs:VOTableType" arraysize="21*">char</dataType></column><column><name>OName</name><description>Source name from X-ray surveys (G2)</description><ucd>meta.id</ucd><dataType xsi:type="vs:VOTableType" arraysize="15*">char</dataType></column><column><name>Band</name><description>[BVR] Spectral band (Johnson-Cousins B, V, or R)</description><ucd>instr.bandpass</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>mag</name><description>Brightest magnitude</description><unit>mag</unit><ucd>phot.mag</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>l_dmag</name><description>[&gt;] Lower limit flag on dmag</description><ucd>meta.code.error</ucd><dataType xsi:type="vs:VOTableType" arraysize="1*">char</dataType></column><column><name>dmag</name><description>Overall optical variability in Band ({Delta}m) (1)</description><unit>mag</unit><ucd>phot.mag;arith.diff</ucd><dataType xsi:type="vs:VOTableType">float</dataType></column><column><name>r_mag</name><description>Reference of mag; in refs.dat file</description><ucd>meta.ref</ucd><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column><column><name>Ref</name><description>Reference of faintest magnitude; in refs.dat file</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="4*">char</dataType></column></table></schema></tableset></ri:Resource>