J/AJ/151/24 LAMOST quasar survey: quasar properties from the DR1 (Ai+, 2016)
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope quasar survey:
quasar properties from the first data release.
Ai Y.L., Wu X.-B., Yang J., Yang Q., Wang F., Guo R., Zuo W., Dong X.,
Zhang Y.-X., Yuan H.-L., Song Y.-H., Wang J., Dong X., Yang M., Wu H.,
Shen S.-Y., Shi J.-R., He B.-L., Lei Y.-J., Li Y.-B., Luo A.-L.,
Zhao Y.-H., Zhang H.-T.
<Astron. J., 151, 24 (2016)>
=2016AJ....151...24A 2016AJ....151...24A (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Spectroscopy ; Redshifts ; Equivalent widths ; Surveys
Keywords: catalogs - quasars: general - surveys
Abstract:
We present preliminary results of the quasar survey in the Large Sky Area
Multi-Object Fiber Spectroscopic Telescope (LAMOST) first data release
(DR1), which includes the pilot survey and the first year of the regular
survey. There are 3921 quasars reliably identified, among which 1180
are new quasars discovered in the survey. These quasars are at low to
median redshifts, with a highest z of 4.83. We compile emission line
measurements around the Hα, Hβ, Mg II, and C IV regions for
the new quasars. The continuum luminosities are inferred from SDSS
photometric data with model fitting, as the spectra in DR1 are
non-flux-calibrated. We also compile the virial black hole mass estimates,
with flags indicating the selection methods, and broad absorption line
quasars. The catalog and spectra for these quasars are also available.
Of the 3921 quasars, 28% are independently selected with optical-infrared
colors, indicating that the method is quite promising for the completeness
of the quasar survey. LAMOST DR1 and the ongoing quasar survey will
provide valuable data for studies of quasars.
Description:
LAMOST began a pilot survey in 2011 October and a regular survey in
2012 September. The regular survey, carried out over five to six
years, has two major components: the LAMOST Experiment for Galactic
Understanding and Exploration (LEGUE) and the LAMOST Extragalactic
Survey (LEGAS; Zhao et al. 2012RAA....12..723Z 2012RAA....12..723Z). LEGAS only uses a
small part of the available observing time due to the limitations of
the LAMOST site, especially the bright sky background and poor seeing.
The first data release (DR1) contains spectra taken before 2013 June
(Luo et al. 2015, Cat. V/146). In this paper we present the results of
the quasar survey from LEGAS.
LAMOST LEGAS spectroscopic observations are taken in a series of at
least three 30 minute exposures. There are 70290 quasar candidates
observed, with 82625 spectra in DR1.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 605 1180 Parameters of the 1180 New Quasars Discovered
in LAMOST DR1
table2.dat 80 2741 Parameters of the 2741 known quasars
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See also:
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
V/149 : LAMOST DR2 catalogs (Luo+, 2016)
J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)
J/ApJS/180/67 : Photometric selection of quasars from SDSS. II.
(Richards+, 2009)
J/AJ/145/159 : LAMOST. II. ugriz photometry of 526 new quasars (Huo+, 2013)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 45 A45 --- spName Spectrum file name (SPEC)
47- 64 A18 --- Target LAMOST DR1 target designation
(HHMMSS.ss+DDMMSS.s) (LAMOST_NAME)
66- 75 F10.6 deg RAdeg Right Ascension in decimal degrees
(J2000) (RA)
77- 86 F10.6 deg DEdeg Declination in decimal degrees (J2000)
(DEC)
88- 92 I5 d MJD [55859/56447] Modified Julian Date of
spectroscopic observation (MJD)
94-113 A20 --- PlanId Spectroscopic plan name (PLANID)
115-116 I2 --- spId [1/16] Spectrograph identification
(SPID)
118-120 I3 --- FiberId [2/250] Spectroscopic fiber number
(FIBERID)
122-129 F8.6 --- z Redshift from visual inspection (Z_VI)
131 I1 --- f_z [0/1]? Flag on z based on visual
inspection (1=not robust) (ZWARING)
133-140 F8.4 mag iMag ? i-band absolute magnitude,
K-corrected to z=2, following
Richards et al. (2006, J/AJ/131/2766)
(MI_Z2)
142 I1 --- NObs [1/7] Number of spectroscopic
observations (NSPECOBS)
144-155 E12.6 --- S/N-Spec Median signal-to-noise ratio per pixel
of the spectrum (SNR_SPEC)
157-164 F8.3 km/s FWHM-Hab Full width at half maximum of broad
Hα (FWHMBROADHA)
166-172 F7.3 0.1nm EW-Hab ? Rest frame equivalent width of broad
Hα (Å) (EWBROADHA)
174-181 F8.3 km/s FWHM-Han Full width at half maximum of narrow
Hα (FWHMNARROWHA)
183-188 F6.3 0.1nm EW-Han ? Rest frame equivalent width of narrow
Hα (Å) (EWNARROWHA)
190-195 F6.3 0.1nm EW-NII6584 ? Rest frame equivalent width of
[N II]6584 (Å) (EWNII6585)
197-202 F6.3 0.1nm EW-SII6717 ? Rest frame equivalent width of
[S II]6717 (Å) (EWSII6718)
204-209 F6.3 0.1nm EW-SII6731 ? Rest frame equivalent width of
[S II]6731 (Å) (EWSII6732)
211-216 F6.3 0.1nm EW-FEHa ? Rest frame equivalent width of Fe
within 6000-6500Å (EWFEHA)
218-227 F10.6 --- NPix-Ha Number of good pixels for the rest
frame 6400-6765Å (LINENPIXHA)
229-237 F9.6 --- S/N-Ha Median signal-to-noise ratio per pixel
for the rest frame 6400-6765Å
(LINEMEDSN_HA)
239-240 I2 --- QF-Ha [-1/0]? Flag for the quality in
Hα fitting (LINEFLAGHA) (1)
242-250 F9.3 km/s FWHM-Hb Full width at half maximum of broad
Hβ (FWHMBROADHB)
252-259 F8.3 0.1nm EW-Hb ? Rest frame equivalent width of broad
Hβ (Å) (EWBROADHB)
261-268 F8.3 km/s FWHM-Hbn Full width at half maximum of narrow
Hβ (FWHMNARROWHB)
270-275 F6.3 0.1nm EW-Hbn ? Rest frame equivalent width of narrow
Hβ (Å) (EWNARROWHB)
277-283 F7.3 0.1nm EW-OIII4959 ? Rest frame equivalent width of
[O III]4959 (Å) (EWOIII4959)
285-291 F7.3 0.1nm EW-OIII5007 ? Rest frame equivalent width of
[O III]5007 (Å) (EWOIII5007)
293-299 F7.3 0.1nm EW-FEHb ? Rest frame equivalent width of Fe
within 4435-4685Å (Å) (EWFEHB)
301-303 I3 --- NPix-Hb [0/355] Number of good pixels for
the rest frame 4750-4950Å
(LINENPIXHB)
305-313 F9.6 --- S/N-Hb Median signal-to-noise ratio per pixel
for the rest frame 4750-4950Å
(LINEMEDSN_HB)
315-316 I2 --- QF-Hb [-1/0]? Flag for the quality in Hβ
fitting (LINEFLAGHB) (1)
318-326 F9.3 km/s FWHM-MGII Full width at half maximum of the whole
Mg II emission line (FWHM_MGII)
328-337 F10.3 0.1nm EW-MGII ? Rest frame equivalent width of
the whole Mg II emission line (Å)
(EW_MGII)
339-347 F9.3 km/s FWHM-MGIIb Full width at half maximum of the whole
broad Mg II (FWHMBROADMGII)
349-356 F8.3 0.1nm EW-MGIIb ? Rest frame equivalent width of
the whole broad Mg II (Å)
(EWBROADMGII)
358-366 F9.3 km/s FWHM-MGII2796 Full width at half maximum of the broad
Mg II 2796 (FWHMBROADMGII_2796)
368-377 F10.3 km/s FWHM-MGII2796n Full width at half maximum of
the narrow Mg II 2796
(FWHMNARROWMGII_2796)
379-386 F8.3 0.1nm EW-FEMGII ? Rest frame equivalent width of Fe
within 2200-3090Å (Å)
(EWFEMGII)
388-390 I3 --- NPix-MGII [0/309] Number of good pixels for
the rest frame 2700-2900Å
(LINENPIXMGII)
392-401 F10.6 --- S/N-MGII Median signal-to-noise ratio per pixel
for the rest frame 2700-2900Å
(LINEMEDSN_MGII)
403-404 I2 --- QF-MGII [-1/0]? Flag for the quality in Mg II
fitting (LINEFLAGMGII) (1)
406-415 F10.3 km/s FWHM-CIV Full width at half maximum of the whole
C IV (FWHM_CIV)
417-427 E11.6 0.1nm EW-CIV Rest frame equivalent width of
the whole C IV (Å) (EW_CIV)
429-438 F10.3 km/s FWHM-CIVb Full width at half maximum of the broad
C IV (FWHMBROADCIV)
440-450 E11.6 0.1nm EW-CIVb Rest frame equivalent width of
the broad C IV (Å) (EWBROADCIV)
452-459 F8.3 km/s FWHM-CIVn Full width at half maximum of
the narrow C IV (FWHMNARROWCIV)
461-471 E11.6 0.1nm EW-CIVn Rest frame equivalent width of
the narrow C IV (Å) (EWNARROWCIV)
473-475 I3 --- NPix-CIV [0/280] Number of good pixels for
the rest frame 1500-1600Å
(LINENPIXCIV)
477-487 E11.6 --- S/N-CIV Median signal-to-noise ratio per pixel
for the rest frame 1500-1600Å
(LINEMEDSN_CIV)
489-490 I2 --- QF-CIV [-1/0]? Flag for the quality in C IV
fitting (LINEFLAGCIV) (1)
492-496 F5.1 --- alphal1 ?=-99 Wavelength power-law index,
αλ, from ∼1300 to
4661Å (ALPHALAMBDA1)
498-502 F5.1 --- alphal2 ?=-99 Wavelength power-law index,
αλ, redward of 4661Å
(ALPHALAMBDA2)
504-510 F7.2 --- chi2 ?=-99 Reduced χ2 in SDSS
photometry modeling
(MODELPHOTREDCHI2)
512-520 F9.6 [10-7W] logL5100 Monochromatic luminosity at 5100Å
(erg/s) (LOGL5100)
522-530 F9.6 [10-7W] logL3000 Monochromatic luminosity at 3000Å
(erg/s) (LOGL3000)
532-540 F9.6 [10-7W] logL1350 Monochromatic luminosity at 1350Å
(erg/s) (LOGL1350)
542-549 F8.6 [Msun] logBH-HB Virial BH mass based on Hβ
(Vestergaard & Peterson
2006ApJ...641..689V 2006ApJ...641..689V) (LOGBH_HB)
551-558 F8.6 [Msun] logBH-MGII Virial BH mass based on Mg II
(Wang et al. 2009ApJ...707.1334W 2009ApJ...707.1334W)
(LOGBH_MGII)
560-568 F9.6 [Msun] logBH-CIV ? Virial BH mass based on C IV
(Vestergaard & Peterson
2006ApJ...641..689V 2006ApJ...641..689V) (LOGBH_CIV)
570-575 F6.2 mJy FPeak ? FIRST peak flux density at 20 cm
(Becker et al. 1995ApJ...450..559B 1995ApJ...450..559B)
(FPEAK)
577 I1 --- BAL [0/1]? Broad absorption trough flag
(BAL_FLAG) (2)
579-593 A15 --- Data-min Flag of quasar selection based on data
mining (FLAGDATAMINING) (G1)
595-598 A4 --- OI-Color Flag of quasar selection based on
optical-infrared color (FLAGOICOLOR)
(G2)
600-605 A6 --- Other Flag of quasar selection from radio,
X-ray or serendipitous (=S) algorithms
(FLAG_OTHERS)
--------------------------------------------------------------------------------
Note (1): Flag indicates reliability of the emission line fitting results upon
visual inspections.
Flag as follows:
0 = Means that the fitting is acceptable and the inferred parameters are
mostly reliable;
-1 = Means that the line measurements may be spurious.
Note (2): Flag indicates whether a broad absorption trough is present in the
spectra by visual inspection.
Flag as follows:
1 = Visually identified as a broad absorption quasar;
0 = Not visually identified as a broad absorption quasar.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 A18 --- Target LAMOST DR1 target designation
(HHMMSS.ss+DDMMSS.s)
20- 24 I5 d MJD [55859/56447] Modified Julian Date of
spectroscopic observation
26- 45 A20 --- PlanId Spectroscopic plan name
47- 48 I2 --- spId [1/16] Spectrograph identification
50- 52 I3 --- FiberId [1/250] Spectroscopic fiber number
54- 68 A15 --- Data-min Flag of quasar selection based on data mining
(G1)
70- 73 A4 --- OI-Color Flag of quasar selection based on
optical-infrared color (G2)
75- 80 A6 --- Other Flag of quasar selection from radio, X-ray or
serendipitous (=S) algorithms
--------------------------------------------------------------------------------
Global notes:
Note (G1): Flag as follows:
Richards09 = A kernel density estimator (KDE; Richards et al. 2009,
J/ApJS/180/67);
SVM = Support vector machine classifiers (SVM; Peng et al.
2012MNRAS.425.2599P 2012MNRAS.425.2599P);
XD = Extreme deconvolution method (XDQSO; Bovy et al.
2011ApJ...729..141B 2011ApJ...729..141B).
Note (G2): Flag as follows:
W = Quasars selected with SDSS/WISE colors;
U = Quasars selected with SDSS/UKIDSS colors.
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History:
From electronic version of the journal
References:
Ai et al. DR1 Paper I. 2016AJ....151...24A 2016AJ....151...24A This catalog
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 Cat. J/ApJS/240/6
Jin et al. DR6-9 Paper IV. 2023ApJS..265...25J 2023ApJS..265...25J Cat. J/ApJS/265/25
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 08-Mar-2018