J/ApJ/901/123ivo://CDS.VizieR/J/ApJ/901/123doi:10.26093/cds/vizier.19010123CDSFathivavsari H.2022-08-25T11:42:14Z2022-02-18T10:14:46ZCDS support team

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

cds-question@unistra.frquasarsvisible-astronomyspectroscopyredshiftedintergalactic-mediumWe report the discovery of 59 new ghostly absorbers from the Sloan Digital Sky Survey Data Release 14. These absorbers, with z_abs_~z_QSO_, reveal no Ly{alpha} absorption, and they are mainly identified through the detection of strong metal absorption lines in the spectra. The number of such previously known systems is 30. The new systems are found with the aid of machine-learning algorithms. The spectra of 41 (out of total of 89) absorbers also cover the Ly{beta} spectral region. By fitting the damping wings of the Ly{beta} absorption in the stacked spectrum of 21 (out of 41) absorbers with relatively stronger Ly{beta} absorption, we measured an HI column density of log N(HI)=21.50. This column density is 0.5dex higher than that of the previous work. We also found that the metal absorption lines in the stacked spectrum of the 21 ghostly absorbers with stronger Ly{beta} absorption have similar properties as those in the stacked spectrum of the remaining systems. This circumstantial evidence strongly suggests that the majority of our ghostly absorbers are indeed DLAs.2020ApJ...901..123Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/901/123CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)J/ApJ/508/200 : QSO low-z Ly{alpha} absorbers (Tripp+, 1998)J/ApJ/524/536 : Nearby Ly{alpha} quasar absorbers (Impey+, 1999)J/PASP/116/622 : SDSS damped Ly{alpha} survey: DR1 (Prochaska+, 2004)J/ApJ/635/123 : The SDSS-DR3 damped Ly{alpha} survey (Prochaska+, 2005)J/A+A/547/L1 : SDSS-III DR9 DLA catalogue (Noterdaeme+, 2012)J/MNRAS/449/1536 : New damped Ly{alpha} absorbers (Turnshek+, 2015)J/MNRAS/472/1850 : Detecting damped Ly{alpha} absorbers (Garnett+, 2017)J/MNRAS/477/5625 : SDSSDR12 eclipsing damped Lya systems (Fathivavsari+, 2018)J/ApJ/888/85 : Ghostly strong Lya abs. in SDSS DR12 (Fathivavsari, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/901/123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/901/123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/901/123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/901/123https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/901/123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/901/123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/901/123/table5 (Newly found ghostly absorbers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/901/123/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/901/123/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/901/123/table5?GETtext/xml+votable180.050000true0.357057514.17289330.0055555555555555566/4208 4304 4619 4672 4730 4817 5156 5252 5352 5425 5572 5651 5682 5868 5879 5964 6070 6134 6262 7196 7361 7479 7513 8380 8457 8594 8966 9151 9289 9362 10130 10147 10371 10415 10575 10632 10759 10881 11001 11024 11067 11072 11346 11502 11941 12628 13347 17254 17361 17769 17988 18011 18095 18171 18190 18350 18793 19030 19666 19674 19730 19738 19794 19806 19852 19962 20093 20134 20153 20263 20450 21880 26261 26307 26384 26508 26979 27028 27246 27323 27387 27749 27860 27950 28198 28202 31465 31690 32648https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/901/123?format=asciiOpticaldefaultJ/ApJ/901/123/table5Newly found ghostly absorbersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS identifier (HHMMSS.ss+DDMMSS.s; J2000)meta.id;meta.maincharzQSO[2.045/3.73] QSO emission redshiftsrc.redshift;pos.heliocentricfloatzabs[2.035/3.71] Ghostly absorber absorption redshiftsrc.redshift;pos.heliocentricfloatF20Display data from table 2 of Fathivavsari, 2020, J/ApJ/888/85meta.ref.urlintnullableSloanDisplay the online SDSS-DR14 data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main