J/MNRAS/444/2456ivo://CDS.VizieR/J/MNRAS/444/2456doi:10.26093/cds/vizier.74442456CDSYang H.Luo A.Chen X.Zhang J.Hou W.Cai J.Wei P.Ren J.Liu X.,Zhao Y.2026-03-18T15:46:50Z2015-09-15T11:57:21ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiescatalogsredshiftedgalaxy-classification-systemsSpectral galaxy pairs (hereafter as SGPs) are composite galaxy spectra that contain two independent redshift systems. These spectra are useful for studying the dust properties of the foreground galaxies. In this article, a total of 165 spectra of SGPs are mined from the Sloan Digital Sky Survey (SDSS) Data Release 9 (DR9) using the concept of 'membership degree' from fuzzy set theory, especially defined to be suitable for fuzzy identification of emission lines. The spectra and images of this sample are classified according to their membership degree and image features, respectively. Many of the second redshift systems are too small or too dim to select from SDSS images alone, making the sample a potentially unique source of information on dust effects in low-luminosity or low surface brightness galaxies, which are underrepresented in morphological pair samples. The dust extinction of those objects with high membership degree is also estimated by Balmer decrement. Additionally, analyses for a series of spectroscopic observations of one SGP from 165 systems indicate that a newly star-forming region of our Milky Way might exist.2014MNRAS.444.2456Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/444/2456CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/444/2456https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/444/2456http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/444/2456https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/444/2456https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/444/2456http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/444/2456GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/444/2456/tablea1 (SGP (Spectral Galaxy Paris) sample selected from SDSS DR9)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/444/2456/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/444/2456/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/444/2456/tablea1?GETtext/xml+votable180.050000true146.90379170.63216670.0055555555555555566/4109 4244 4301 4332 4365 4459 4598 4618 4737 5079 5083 5119 5159 5161 5236 5312 5356 5374 5436 5500 5616 5667 5688 5804 6056-6057 6065 6199 6219 6456 6494 6560 6654 6915 7291 7317 7436 7606 8216 8221 8230 8239 8289 8299 8342 8887 8901 9039 9081 9209 9216 9243 9312 9321 9375 9461 9506 9734 9909 9926 9998 10307 10318 10579 10632 10695 10801 10869 11126 11322 11433 11952 12547 17239 17244 17295 17406 17565 17661 17725 17751-17752 17778 17806 17983 18002 18004 18009 18022-18023 18026 18030 18073 18112 18395 18771 18780 18791 18802 18856 18954 19112 19988 22715-22716 22719 22867 23060 23062 23182 23190 23202 23205 23212 25917 26002 26027 26078 26085 26212 26230 26284 26401 26481 26943 26966 27056 27073 27093 27225 27328 27509 27565 27601 27604 27627 27640 27655-27656 27787 27836 27918 28096 28153 28161 28182 28195 28320 28369 28455 28554 28615 31311 31379 31690 32434 36731 36861https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/444/2456?format=asciiOpticaldefaultJ/MNRAS/444/2456/tablea1SGP (Spectral Galaxy Paris) sample selected from SDSS DR9Seq[1/165] SGP sequential numbermeta.recordintprimaryn_Seq[*] 2 redshift values exist in SDSS (1)meta.notecharSDSSSDSS source name (2)meta.id;meta.maincharz1[0/0.22] First redshift (3)src.redshiftfloate_z1[0/0.02] rms uncertainty on z1 (3)stat.errordoublez2[0/0.38] Second redshift (3)src.redshiftfloate_z2[0/0.10] rms uncertainty on z2 (3)stat.errordoubleGrade[ABCD] Grade level of spectrum, A=best (4)meta.code.qual;src.redshiftcharEnvEnvironment of the SGP (5)meta.code;src.morphcharRefsRelevant references for objects that appear in the literature (6)meta.ref;pos.framecharDR7+9Display the data from SDSS-DR7 and SDSS-DR9meta.ref.urlcharSloanDisplay the SDSS data for these galaxiesmeta.ref.urlchar_RAPosition from Name (right ascension part)degpos.eq.ra;meta.main_DEPosition from Name (declination part)degpos.eq.dec;meta.main