HST observations of host galaxies in three radio-selected BL lacertae objects
Identifieur interne : 001644 ( PascalFrancis/Curation ); précédent : 001643; suivant : 001645HST observations of host galaxies in three radio-selected BL lacertae objects
Auteurs : Renato Falomo [Italie] ; C. Megan Urry [États-Unis] ; Joseph E. Pesce ; Riccardo Scarpa [Italie, États-Unis] ; Mauro Giavalisco [États-Unis] ; Aldo Treves [Italie]Source :
- The Astrophysical journal [ 0004-637X ] ; 1997-02-10.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
We present high-resolution images of three BL Lac objects (0814+425, 1823+568, 2254+074) taken with the WFPC-2 camera on Hubble Space Telescope (HST) as part of a study of BL Lacs from a complete radio-selected sample. In two cases we clearly detect the host galaxies while the third BL Lac (0814+425) is unresolved. The host galaxy of 2254+074 is a moderately bright elliptical, while the inferred luminosity of the host galaxy for 1823+568 is at the high end of the range for previously known BL Lac hosts. The lack of detection of a host galaxy for 0814+425 calls into question the validity of its low reported redshift. Comparison of the HST data with subarcsecond ground-based R-band images shows excellent agreement on the largest scales, while on smaller scales only HST detects the galaxy significantly above the nuclear light. In the case of 2254+074, the high resolution of HST allows us to establish that the host galaxy is an elliptical.
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Megan" last="Urry">C. Megan Urry</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218 cmu@stsci.edu pesce@kepler.stsci.edu</s1><sZ>2 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Maryland</region></placeName><wicri:cityArea>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore</wicri:cityArea></affiliation></author><author><name sortKey="Pesce, Joseph E" sort="Pesce, Joseph E" uniqKey="Pesce J" first="Joseph E." last="Pesce">Joseph E. Pesce</name></author><author><name sortKey="Scarpa, Riccardo" sort="Scarpa, Riccardo" uniqKey="Scarpa R" first="Riccardo" last="Scarpa">Riccardo Scarpa</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Astronomy, Padua University, Vicolo dell'Osservatorio 5, 35122 Padua, Italy</s1><sZ>4 aut.</sZ></inist:fA14><country xml:lang="fr">Italie</country><wicri:regionArea>Department of Astronomy, Padua University, Vicolo dell'Osservatorio 5, 35122 Padua</wicri:regionArea></affiliation><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218 riccardo@astrpd.pd.astro.it scarpa@stsci.edu</s1><sZ>4 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Maryland</region></placeName><wicri:cityArea>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore</wicri:cityArea></affiliation></author><author><name sortKey="Giavalisco, Mauro" sort="Giavalisco, Mauro" uniqKey="Giavalisco M" first="Mauro" last="Giavalisco">Mauro Giavalisco</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Carnegie Observatories, 813 Santa Barbara Street, Pasadena, California 91101-1292 mauro@ociw.edu</s1><sZ>5 aut.</sZ></inist:fA14><country wicri:rule="url">États-Unis</country><wicri:regionArea>Carnegie Observatories, 813 Santa Barbara Street, Pasadena</wicri:regionArea></affiliation></author><author><name sortKey="Treves, Aldo" sort="Treves, Aldo" uniqKey="Treves A" first="Aldo" last="Treves">Aldo Treves</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>SISSA/ISAS, via Beirut 2-4, 34014 Trieste, Italy treves@astmiu.uni.mi.astro.it</s1><sZ>6 aut.</sZ></inist:fA14><country wicri:rule="url">Italie</country><wicri:regionArea>SISSA/ISAS, via Beirut 2-4, 34014 Trieste</wicri:regionArea></affiliation></author></analytic><series><title level="j" type="main">The Astrophysical journal</title><title level="j" type="abbreviated">Astrophys. j.</title><idno type="ISSN">0004-637X</idno><imprint><date when="1997-02-10">1997-02-10</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">The Astrophysical journal</title><title level="j" type="abbreviated">Astrophys. j.</title><idno type="ISSN">0004-637X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Astronomical photometry</term><term>BL Lacertae objects</term><term>Brightness</term><term>Experimental study</term><term>Modelling</term><term>Theoretical study</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>9854C</term><term>9852E</term><term>9585K</term><term>Etude expérimentale</term><term>Etude théorique</term><term>Objet BL Lacertae</term><term>Photométrie astronomique</term><term>Brillance</term><term>Modélisation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present high-resolution images of three BL Lac objects (0814+425, 1823+568, 2254+074) taken with the WFPC-2 camera on Hubble Space Telescope (HST) as part of a study of BL Lacs from a complete radio-selected sample. In two cases we clearly detect the host galaxies while the third BL Lac (0814+425) is unresolved. The host galaxy of 2254+074 is a moderately bright elliptical, while the inferred luminosity of the host galaxy for 1823+568 is at the high end of the range for previously known BL Lac hosts. The lack of detection of a host galaxy for 0814+425 calls into question the validity of its low reported redshift. Comparison of the HST data with subarcsecond ground-based R-band images shows excellent agreement on the largest scales, while on smaller scales only HST detects the galaxy significantly above the nuclear light. In the case of 2254+074, the high resolution of HST allows us to establish that the host galaxy is an elliptical.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0004-637X</s0></fA01><fA02 i1="01"><s0>ASJOAB</s0></fA02><fA03 i2="1"><s0>Astrophys. j.</s0></fA03><fA05><s2>476</s2></fA05><fA06><s2>1</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>HST observations of host galaxies in three radio-selected BL lacertae objects</s1></fA08><fA11 i1="01" i2="1"><s1>FALOMO (Renato)</s1></fA11><fA11 i1="02" i2="1"><s1>URRY (C. 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All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>97-0566599</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>The Astrophysical journal</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>We present high-resolution images of three BL Lac objects (0814+425, 1823+568, 2254+074) taken with the WFPC-2 camera on Hubble Space Telescope (HST) as part of a study of BL Lacs from a complete radio-selected sample. In two cases we clearly detect the host galaxies while the third BL Lac (0814+425) is unresolved. The host galaxy of 2254+074 is a moderately bright elliptical, while the inferred luminosity of the host galaxy for 1823+568 is at the high end of the range for previously known BL Lac hosts. The lack of detection of a host galaxy for 0814+425 calls into question the validity of its low reported redshift. Comparison of the HST data with subarcsecond ground-based R-band images shows excellent agreement on the largest scales, while on smaller scales only HST detects the galaxy significantly above the nuclear light. 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