J/ApJS/240/6 LAMOST Quasar Survey: Data Releases 4 and 5 (Yao+, 2019)
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar
Survey: The Fourth and Fifth Data Releases.
Yao S., Wu X.-B., Ai Y.L., Yang J., Yang Q., Dong X., Joshi R., Wang F.,
Feng X., Fu Y., Hou W., Luo A.-L., Kong X., Liu Y., Zhao Y.-H., Zhang Y.-X.,
Yuan H.-L., Shen S.
<Astrophys. J. Suppl. 240, 6 (2019)>
=2019ApJS..240....6Y 2019ApJS..240....6Y
ADC_Keywords: QSOs; Spectra, optical; Surveys; Redshifts; Equivalent widths;
Cross identifications; X-ray sources; Radio sources
Keywords: catalogs ; quasars: general ; surveys
Abstract:
We present Data Releases 4 and 5 of the quasar catalog from the quasar
survey by the Large Sky Area Multi-object Fiber Spectroscopic
Telescope (LAMOST), which includes quasars observed between
2015-September and 2017-June. There are a total of 19253 quasars
identified by visual inspections of the spectra. Among them,
11458 were independently discovered by LAMOST, in which 3296 were
reported by the SDSS DR12 and DR14 quasar catalog after our survey
began, while the remaining 8162 are new discoveries of LAMOST. We
provide the emission line measurements for Hα, Hβ, MgII,
and/or CIV for 18100 quasars. Since LAMOST does not have absolute flux
calibration information, we obtain the monochromatic continuum
luminosities by fitting the SDSS photometric data using the quasar
spectra, and then estimate the black hole masses. The catalog and
spectra for these quasars are available online. This is the third
installment in the series of LAMOST quasar surveys that has released
spectra for ∼43000 quasars to date. There are 24772 independently
discovered quasars, 17128 of which are newly discovered. In addition
to this great supplement to the new quasar discoveries, LAMOST has
also provided a large database (overlapped with SDSS) for
investigating quasar spectral variability and discovering unusual
quasars, including changing-look quasars, with ongoing and upcoming
large surveys.
Description:
LAMOST is a quasi-meridian reflecting Schmidt telescope with an
effective light-collecting aperture that varies from 3.6m to 4.9m
(depending on the pointing direction) and a 5° field of view in
diameter. It has 4000 robotic fibers, with ∼3" diameter, mounted on
its focal plane and connected to 16 spectrographs. Each spectrum of
the target is split into two channels, red and blue. The blue channel
is optimized for 3700-5900Å, and the red channel is optimized for
5700-9000Å. The spectral resolution reaches R∼1800 over the entire
wavelength range. The LAMOST regular survey was carried out from
September 2012 to 2017 June.
The LAMOST quasar survey was conducted under the LAMOST ExtraGAlactic
Survey (LEGAS; Zhao+ 2012RAA....12..723Z 2012RAA....12..723Z), which covers the high
Galactic latitude area in the northern sky. The typical exposure time
for each target is usually ∼90 minutes, which is equally divided
into three exposures.
In this paper, we present the results of the LAMOST quasar survey
conducted in the fourth and fifth years as released in LAMOST data
release 4 (DR4) and data release 5 (DR5).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 1994 19253 Quasars identified in LAMOST DR4 and DR5
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Description of file:
apjsaaef88t1_mrt.fits is the original catalog in FITS format (with the
Header in VOTable format)
See also:
VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)
VII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)
IX/55 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR8 (XMM-SSC, 2018)
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
J/AJ/109/1498 : Large Bright Quasar Survey VI (LBQS) (Hewett+, 1995)
J/ApJS/155/257 : NBC Quasar Candidate Catalog (Richards+, 2004)
J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)
J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)
J/MNRAS/383/581 : Broad-line Balmer decrements in blue AGN (Dong+, 2008)
J/MNRAS/386/1605 : Luminous K-band selected QSOs from UKIDSS (Maddox+, 2008)
J/ApJS/180/67 : Phot. selection of QSOs from SDSS. II. (Richards+, 2009)
J/MNRAS/406/1583 : Quasar from SDSS and UKIDSS (Wu+, 2010)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012)
J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)
J/AJ/145/159 : LAMOST. II. ugriz photometry of 526 new quasars (Huo+, 2013)
J/AJ/146/100 : New 2.2<z<3.5 quasars from SDSS and UKIDSS (Wu+, 2013)
J/other/RAA/15.1438 : LAMOST new QSOs in M31 and M33 vicinity (Huo+, 2015)
J/AJ/151/24 : LAMOST quasar survey: from the DR1 (Ai+, 2016)
J/A+A/588/A103 : 2nd ROSAT all-sky survey (2RXS) source cat. (Boller+, 2016)
J/ApJ/819/24 : z>4.5 QSOs with SDSS and WISE. I. Opt. spectra (Wang+, 2016)
J/AJ/155/189 : LAMOST Quasar Survey: from the DR2&3 (Dong+, 2018)
http://www.lamost.org/ : LAMOST survey home page
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- ObsID [353601018/584816178] Unique spectra ID
in LAMOST database
11- 20 A10 "Y/M/D" ObsDate Target observation date
22- 40 A19 --- LAMOST LAMOST designation
(JHHMMSS.ss+DDMMSS.ss) (NAME)
42- 52 F11.7 deg RAdeg Right ascension (J2000) (RA)
54- 63 F10.7 deg DEdeg [-6.9/60.4] Declination (J2000) (DEC)
65- 69 I5 d LMJD [57279/57920] Local modified Julian day
of observation (1)
71- 88 A18 --- planID Spectroscopic plan identification (1)
90- 91 I2 --- spID [1/16] Spectrograph identification (1)
93- 95 I3 --- fiberID [1/250] Spectroscopic fiber number (1)
97- 117 F21.19 --- z [0.001/5.4] Redshift based on visual
inspection (Z_VI)
119 I1 --- q_z [0/1] ZWARNING flag based on visual
inspection (1=not robust) (ZWARNING)
121- 124 I04 --- Flag [0/1110] Flag of quasar candidate
selection (SOURCE_FLAG) (2)
126- 146 F21.15 mag iMAG [-33.8/-9.4]?=-9999 Absolute i-band
magnitude K-corrected to z=2, Mi(z=2)
(Mi_Z2) (3)
148- 149 I2 --- Nsp [1/13] Number of spectroscopic
observations (NSPECOBS) (4)
151- 175 F25.19 --- SNR [0/89]?=-9999 Median S/N per pixel in
the wavelength regions of
[4000-5700]Å and [6200,9000]Å
(SNR_SPEC)
177 I1 --- BAL [0] Flag of broad absorption features
(always "0":not present) (BAL_FLAG)
179- 197 F19.13 km/s FWHMbHa [890/15499]?=-9999 FWHM of broad
Hα (FWHMBROADHA)
199- 218 E20.16 km/s e_FWHMbHa [-1/3935]?=-9999 FWHMbHa uncertainty
220- 241 E22.17 0.1nm EWbHa [-8428/1.2e+7]?=-9999 Rest-frame EW of
broad Hα in Å (EWBROADHA)
243- 262 E20.16 0.1nm e_EWbHa [-1/651.7]?=-9999 EWbHa uncertainty
264- 283 F20.14 km/s FWHMnHa [0/1268]?=-9999 FWHM of narrow Hα
(FWHMNARROWHA)
285- 305 F21.15 km/s e_FWHMnHa [-1/367.5]?=-9999 FWHMnHa uncertainty
307- 327 E21.17 0.1nm EWnHa [0/848.1]?=-9999 Rest-frame EW of
narrow Hα in Å (EWNARROWHA)
329- 351 F23.17 0.1nm e_EWnHa [-1/460.4]?=-9999 EWnHa uncertainty
353- 374 E22.18 0.1nm EWNII [-683/703.1]?=-9999 Rest-frame EW of
[NII]λ6584 in Å (EWNII6584)
376- 398 F23.17 0.1nm e_EWNII [-1/187.6]?=-9999 EWNII uncertainty
400- 421 E22.17 0.1nm EWSII6716 [0/344.2]?=-9999 Rest-frame EW of
[SII]λ6716 in Å (EWSII6716)
423- 445 F23.17 0.1nm e_EWSII6716 [-1/54.1]?=-9999 EWSII6716 uncertainty
447- 468 E22.18 0.1nm EWSII6731 [0/2.7e+6]?=-9999 Rest-frame EW of
[SII]λ6731 in Å (EWSII6731)
470- 492 F23.17 0.1nm e_EWSII6731 [-1/88]?=-9999 EWSII6731 uncertainty
494- 515 E22.19 0.1nm EWFeHa [-2765/1753]?=-9999 Rest-frame
equivalent width of Fe within
6000-6500Å in Å (EWFEHA)
517- 523 F7.1 --- NHa [209/241]?=-9999 Number of good pixels
for the rest-frame 6400-6765Å
(LINENPIXHA)
525- 548 F24.18 --- MedSNHa [-0/193]?=-9999 Median S/N per pixel
for the rest-frame 6400-6765Å
(LINEMEDSN_HA)
550- 554 I5 --- q_Ha [-9999/0]? Flag for the quality in
Hα fitting (0=reliable)
(LINEFLAGHA) (5)
556- 574 F19.13 km/s FWHMbHb [877/14998]?=-9999 FWHM of broad
Hβ (FWHMBROADHB)
576- 595 E20.16 km/s e_FWHMbHb [-1/8968]?=-9999 FWHMbHb uncertainty
597- 618 E22.18 0.1nm EWbHb [-834730/2.8e+17]?=-9999 Rest-frame EW of
broad Hβ in Å (EWBROADHB)
620- 640 E21.17 0.1nm e_EWbHb [-1/3.1e+16]?=-9999 EWbHb uncertainty
642- 661 F20.14 km/s FWHMnHb [0/897]?=-9999 FWHM of narrow Hβ
(FWHMNARROWHB)
663- 684 F22.16 km/s e_FWHMnHb [-1/669]?=-9999 FWHMnHb uncertainty
686- 707 E22.18 0.1nm EWnHb [0/5.4e+16]?=-9999 Rest-frame EW of
narrow Hβ in Å (EWNARROWHB)
709- 729 E21.17 0.1nm e_EWnHb [-1/1.6e+16]?=-9999 EWnHb uncertainty
731- 750 F20.14 km/s FWHMOIII [0/3132]?=-9999 FWHM of
[OIII]λ5007 (FWHMOIII5007)
752- 773 F22.16 km/s e_FWHMOIII [-1/354]?=-9999 FWHMOIII uncertainty
775- 795 E21.18 0.1nm EWOIII [0/4e+17]?=-9999 Rest-frame EW of
[OIII]λ5007 in Å
(EWOIII5007)
797- 818 F22.16 0.1nm e_EWOIII [-1/24]?=-9999 EWOIII uncertainty
820- 841 E22.19 0.1nm EWFeHb [-1.5e+14/1.9e+17]?=-9999 Rest-frame
equivalent width of Fe within
4435-4685Å in Å (EWFEHB)
843- 849 F7.1 --- NHb [179/180]?=-9999 Number of good pixels
for the rest-frame 4750-4950Å
(LINENPIXHB)
851- 873 F23.17 --- MedSNHb [0/100]?=-9999 Median S/N per pixel for
the rest-frame 4750-4950Å
(LINEMEDSN_HB)
875- 879 I5 --- q_Hb [-9999/0]? Flag for the quality in
Hβ fitting (0=acceptable)
(LINEFLAGHB) (5)
881- 900 F20.14 km/s FWHMMgII [134.9/16576]?=-9999 FWHM of the whole
MgII emission line (FWHM_MGII)
902- 922 E21.17 km/s e_FWHMMgII [-1/4756]?=-9999 FWHMMgII uncertainty
924- 945 E22.18 0.1nm EWMgII [-5699/1.8e+18]?=-9999 Rest-frame
equivalent width of the whole MgII in
Å (EW_MGII)
947- 968 E22.18 0.1nm e_EWMgII [-1/1.8e+17]?=-9999 EWMgII uncertainty
970- 989 F20.14 km/s FWHMbMgII [202/26186]?=-9999 FWHM of the whole
broad MgII (FWHMBROADMGII)
991- 1011 E21.17 km/s e_FWHMbMgII [-1/15925]?=-9999 FWHMbMgII
uncertainty
1013- 1034 E22.18 0.1nm EWbMgII [-5276/1.6e+18]?=-9999 Rest-frame
equivalent width of the whole broad
MgII in Å (EWBROADMGII)
1036- 1057 E22.18 0.1nm e_EWbMgII [-1/1.8e+17]?=-9999 EWbMgII
uncertainty
1059- 1078 F20.14 km/s FWHMbMgII2 [202/26186]?=-9999 FWHM of the broad
MgIIλ2796 (FWHMBROADMGII_2796)
1080- 1101 F22.16 km/s e_FWHMbMgII2 [-1/18770]?=-9999 FWHMbMgII2
uncertainty
1103- 1123 F21.15 km/s FWHMnMgII2 [0/897]?=-9999 FWHM of the narrow
MgIIλ2796 (FWHMNARROWMGII_2796)
1125- 1146 F22.16 km/s e_FWHMnMgII2 [-1/97551]?=-9999 FWHMnMgII2
uncertainty
1148- 1170 E23.18 0.1nm EWFeMgII [-876/4.1e+19]?=-9999 Rest-frame
equivalent width of Fe within
2200-3090Å in Å (EWFEMGII)
1172- 1178 F7.1 --- NMgII [310/311]?=-9999 Number of good pixels
for the rest-frame 2700-2900Å
(LINENPIXMGII)
1180- 1204 F25.19 --- MedSNMgII [0/124]?=-9999 Median S/N per pixel for
the rest-frame 2700-2900Å
(LINEMEDSN_MGII)
1206- 1210 I5 --- q_MgII [-9999/0]? Flag for the quality in MgII
fitting (0=acceptable) (LINEFLAGMGII)
(5)
1212- 1231 F20.14 km/s FWHMCIV [215.9/36566]?=-9999 FWHM of the whole
CIV (FWHM_CIV)
1233- 1253 E21.17 km/s e_FWHMCIV [-1/6447]?=-9999 FWHMCIV uncertainty
1255- 1276 E22.17 0.1nm EWCIV [-3.9e+6/6159]?=-9999 Rest-frame EW of
the whole CIV in Å (EW_CIV)
1278- 1298 E21.17 0.1nm e_EWCIV [-1/217]?=-9999 EWCIV uncertainty
1300- 1318 F19.13 km/s FWHMbCIV [674/37943]?=-9999 FWHM of the broad
CIV (FWHMBROADCIV)
1320- 1340 F21.15 km/s e_FWHMbCIV [-1/10426]?=-9999 FWHMbCIV uncertainty
1342- 1363 E22.17 0.1nm EWbCIV [-3.9e+6/5829]?=-9999 Rest-frame EW of
the broad CIV in Å (EWBROADCIV)
1365- 1388 F24.17 0.1nm e_EWbCIV [-55395/215]?=-9999 EWbCIV uncertainty
1390- 1410 F21.15 km/s FWHMnCIV [0/897]?=-9999 FWHM of the narrow CIV
(FWHMNARROWCIV)
1412- 1432 F21.15 km/s e_FWHMnCIV [-1/762]?=-9999 FWHMnCIV uncertainty
1434- 1455 E22.18 0.1nm EWnCIV [-1486/330]?=-9999 Rest-frame EW of the
narrow CIV in Å (EWNARROWCIV)
1457- 1479 F23.17 0.1nm e_EWnCIV [-29/94]?=-9999 EWnCIV uncertainty
1481- 1487 F7.1 --- NCIV [280/281]?=-9999 Number of good pixels
for the rest-frame 1500-1600Å
(LINENPIXCIV)
1489- 1511 F23.17 --- MedSNCIV [0/68]?=-9999 Median S/N per pixel for
the rest-frame 1500-1600Å
1513- 1517 I5 --- q_CIV [-9999/0]? Flag for the quality in CIV
fitting (0=acceptable) (LINEFLAGCIV)
(5)
1519- 1540 F22.16 --- alphaL1 [-2/-0.5]?=-9999 Wavelength power-law
index from ∼1300 to 4661Å
(ALPHALAMBDA1)
1542- 1566 F25.19 --- alphaL2 [-0.5/0.5]?=-9999 Wavelength power-law
index redward of 4661Å
(ALPHALAMBDA2)
1568- 1588 E21.19 --- rChi2 [3e-5/522002]?=-9999 Reduced chi-square
(MODELPHOTREDCHI2)
1590- 1610 F21.15 [10-7W] logL5100 [38.7/47]?=-9999 Monochromatic
luminosity at 5100Å in erg/s
1612- 1632 F21.15 [10-7W] logL3000 [28.4/48.7]?=-9999 Monochromatic
luminosity at 3000Å in erg/s
1633 A1 --- f_logL3000 i: -infinity
1635- 1655 F21.15 [10-7W] logL1350 [28.3/48.8]?=-9999 Monochromatic
luminosity at 1350Å in erg/s
1656 A1 --- f_logL1350 i: -infinity
1658- 1679 F22.16 [Msun] logBHHb [5.6/10]?=-9999 Virial BH mass based on
Hβ (LOGBH_HB)
1681- 1702 F22.16 [Msun] logBHMgII [0.6/10.3]?=-9999 Virial BH mass based
on MgII (LOGBH_MGII)
1704- 1725 F22.16 [Msun] logBHCIV [6.4/11]?=-9999 Virial BH mass based on
CIV (LOGBH_CIV)
1727- 1744 A18 --- SDSS Name of the quasar in the SDSS quasar
catalog (Paris+ 2018, VII/286 ;
superseded by VII/289) (6)
1746- 1749 A4 --- --- [2RXS]
1751- 1766 A16 --- 2RXS Name of the object in the second ROSAT
all-sky survey point-source catalog
(Boller+ 2016, J/A+A/588/A103 ;
JHHMMSS.s+DDMMSS) ( 2RXS_NAME)
1768- 1788 F21.15 ct Cts [5.6/729]?=-9999 Background-corrected
source counts in 0.1-2.4keV from 2RXS
source catalog ( 2RXS_CTS)
1790- 1811 F22.16 ct e_Cts [2.7/29]?=-9999 Cts uncertainty
1813- 1832 F20.14 s 2RXSExp [54/1500]?=-9999 Source exposure time
from 2RXS (RXS2_EXPTIME)
1834- 1856 F23.17 arcsec Sep2RXS [0.1/30]?=-9999 LAMOST-2RXS separation
(LM2RXSSEP)
1858- 1861 A4 --- --- [3XMM]
1863- 1878 A16 --- 3XMM Name of the object in XMM-Newton
Serendipitous Source Catalog
(3XMM-DR8, Rosen+ 2016, IX/55 ;
JHHMMSS.s+DDMMSS) ( 3XMM_NAME)
1880- 1901 E22.17 mW/m2 F0.2-12keV [6.6e-15/4.3e-11]?=-9999 Flux in the
0.2-12.0keV band from 3XMM-DR8
( 3XMM_FLUX)
1903- 1924 E22.17 mW/m2 e_F0.2-12keV [2e-15/1.9e-13]?=-9999 F0.2-12keV
uncertainty
1926- 1949 F24.18 arcsec Sep3XMM [0.006/3]?=-9999 LAMOST-3XMM separation
(LM3XMMSEP)
1951- 1972 F22.16 mJy Fpk [0.98/14775]?=-9999 FIRST peak flux
density at 20cm (FPEAK)
1974- 1994 E21.19 arcsec SepFIRST [0.0003/5]?=-9999 LAMOST-FIRST
separation (LMFIRSTSEP)
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Note (1): These four numbers are unique for each spectrum named in the format
of spec-LMJD-planID_spID-fiberID.fits
Note (2): This flag is a four-character string indicating how the quasar
candidate is selected, in which the value of each character is a
boolean value, i.e., "1" is truth and "0" is false. The first
character indicates infrared-optical color selection. The second
character indicates data-mining selection. The third character
indicates selection based on X-ray detection. The fourth character
indicates selection based on radio detection.
A entry with SOURCE_FLAG="1101" indicates that the quasar was
selected by its infrared-optical color, data-mining algorithms and
radio detection. A entry with SOURCE_FLAG="0000" means the object is
not included in LAMOST LEGAS quasar survey sample but identified as
quasar.
Note (3): The K-corrected i-band absolute magnitude Mi (z=2), normalized
at z=2 following Richards+ 2006, J/AJ/131/2766
Note (4): Number of spectroscopic observations for the quasar. When there is
more than one observation for the object, the line properties are
obtained from only one of the observations in which the fiber pointing
position is nearest to the position in our quasar candidate catalog.
Note (5): Flag indicates reliability of the emission-line-fitting results in
the emission line region upon visual inspections. Code as follows:
0 = reliable
-1 = unreliable
-9999 = the line is not measured owing to too few good pixels in the
fitting region.
Note (6): 23 original designations from SDSS-DR14 (with missing "0" in RA
or DEC) have been corrected for the IAU SDSS names (HHMMSS.ss+DDMMSS.s)
by CDS.
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History:
From electronic version of the journal
References:
Ai et al. DR1 Paper I. 2016AJ....151...24A 2016AJ....151...24A Cat. J/AJ/151/24
Dong et al. DR2+3 Paper II. 2018AJ....155..189D 2018AJ....155..189D Cat. J/AJ/155/189
Yao et al. DR4+5 Paper III. 2019ApJS..240....6Y 2019ApJS..240....6Y This catalog
Jin et al. DR6-9 Paper IV. 2023ApJS..265...25J 2023ApJS..265...25J Cat. J/ApJS/265/25
(End) Emmanuelle Perret [CDS] 10-May-2019