Download - Compiled quasar catalog from LAMOST DR1
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Compiled quasar catalog from LAMOST DR1
艾艳丽Department of Astronomy, Peking University
Collaborators : Xuebing Wu, Jinyi Yang, Feige Wang, Jianguo Wang, Xiaoyi Dong
and LEGAS team
LAMOST 用户培训会 兴隆 2014.07.02
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From Fan, X. 2014, Xian
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quasar selection
• point source• contaminations are ≈100, million stars
quasar selection : select candidates then with optical spectra confirmation and redshift measurement
• how to select the quasar candidates • based on observed properties
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unification model and observed spectra
Urry & Padovani, 1995 Narrow lines only
Broad permitted lines: Ha, Hb
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Similar quasar spectra
Vanden Berk et al. 2001
composite spectra at redshift 0.04---4.
Characterize by featureless continuum and series emission linesRemarkably similar from one quasar to another, compared to galaxy and stars
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SDSS photometric system
Richards et al. 2006
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Quasar selection I ≈16,000 quasars found by SDSS based on multi-color optical selection (UV-excess)
Fan et al. 1999
Star
quasar
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quasar selection -- Ilow completeness at redshift 2 –3 as optical
colors of quasars similar to those of stars
Richards et al. 2006
low completeness
to improve selection completeness variability selection( Butler 2011) combined optical—infrared color ----- LAMOST quasar selection
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Quasar selection -- IIOptical– infrared color selection ( K-band excess)
Maddox et al. 2008
Early K star
Early M star
Unreddened QSO z=3
Reddened QSO z=3
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Quasar selection III
QSO z < 2.2QSO 2.2< z< 4QSO z >4
Wu 2010
SDSS_UKIDSSSDSS_WISE
Wu 2012
QSO z < 2.2QSO 2.2< z< 4QSO z >4
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LAMOST quasar candidates
LEGAS team
Mostly from SDSS-UKIDSSSDSS-WISE
Partly from X-ray, radio, and other selections
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Observed quasar candidates ≈80,000 observed in pilot survey and first year
of regular survey≈60,000 classified as ‘unknown’ with featureless
“unknown”
Magnitude distribution of ‘unknown’
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≈5000 identified QSOsLines move in cross-over between blue and red channel
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≈ 3000 covered by SDSS DR10 possible emission line variation continuum variation but “should be carful”
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visually checking againFor the ≈2000 newly identified quasars
Visually checked again and double checked independently by numbers of our group
≈600 are misclassified as quasar by pipeline
visually check redshift and correct some of them for the ≈1400 quasars
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≈1400 new quasars identified Z--Mi distribution
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Median S/N ratio of emision lines
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Emission line fitting and measurements• ≈1000 with high enough S/N for spectra modelling
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Continuum flux estimation with SDSS photometry
use SDSS ugriz photometry and quasar continuum and emission line template
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Black hole mass estimation
Black hole mass distribution
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Optical –infrared color of the quasar
mostly from SDSS-UKIDSS, SDSS-WISE selection
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more to do
≈40 X-ray source matched with XMM-Newton≈100 radio source matched with FIRST≈20 with repeated LAMOST spectraspecial quasar identified, such as, double-
peaked quasar, broad-absorption line quasar
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double-peaked quasar
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Broad absorption quasar
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谢谢