类星体光谱识别及红移测量软件 a spectrum eye recognition assistant for quasar spectra
DESCRIPTION
类星体光谱识别及红移测量软件 A Spectrum Eye Recognition Assistant for Quasar Spectra. 2014 年 6 月 30 Yuan Hailong. Background. QSO Template spectra with z=0. Spectral type Phenomenology classification Method: template matching QSO Large redshift z Limit wavelength range Low SNR and other defects - PowerPoint PPT PresentationTRANSCRIPT
类星体光谱识别及红移测量软件 A Spectrum Eye Recognition Assistant for Quasar Spectra
2014 年 6 月 30Yuan Hailong
Background• Spectral type
– Phenomenology classification– Method: template matching
• QSO– Large redshift z– Limit wavelength range– Low SNR and other defects– Broad emission lines
– Manual ajustment
• Not only for QSO– Star (O, B, A, F, G, K, M, WD, Carbon)– Galaxy
QSO Template spectra with z=0
Broad emission lines• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Supported files• Image
– JPG– PNG– GIF– …
• LAMOST fits• SDSS fits• Others types
• Location– Local – URL: http, ftp, file
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Image file: main interface• 1, file path• 2, spectra• 3, target info• 4, flux scale & shift• 5, wavelength scale & shift• 6, popup menu
• Template Spectra Control– Color: blue
– Mouse click, Mouse drag– Mouse wheel
– Set reference line to calculate z
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Fits file: Target information
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
RA, DEC, mag, obsdate, planid FitsHeader
Fits file: Flux adjustment
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Fits file: Wavelength range adjustment
Ca II 三重线
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
3700~90004000~5000 8000~9000
Template selection• Right click PopupMenu Plot
template – Default– Star– Galaxy– QSO– Others
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Templates from SDSS• spDR2-000_O-star.fit• spDR2-001_OB-transition-star.fit• spDR2-002_B-star.fit• spDR2-003_A-star.fit• spDR2-004_A-star.fit• spDR2-005_FA-transition-star.fit• spDR2-006_F-star.fit• spDR2-007_F-star.fit• spDR2-008_G-star.fit• spDR2-009_G-star.fit• spDR2-010_K-star.fit• spDR2-011_M1-star.fit• spDR2-012_M3-star.fit• spDR2-013_M5-star.fit• spDR2-014_M8-star.fit
• spDR2-015_L1-star.fit• spDR2-016_Magnetic-white-dwarf.fit• spDR2-017_Carbon-star.fit• spDR2-018_Carbon-star.fit• spDR2-019_Carbon-star.fit• spDR2-020_White-dwarf.fit• spDR2-021_B-white-dwarf.fit• spDR2-022_Low-metallicity-K-subdwarf.fit
• spDR2-023_Early-type-galaxy.fit• spDR2-024_Galaxy.fit• spDR2-025_Galaxy.fit• spDR2-026_Galaxy.fit• spDR2-027_Late-type-galaxy.fit• spDR2-028_Luminous-Red-Galaxy.fit
• spDR2-029_QSO.fit• spDR2-030_QSO-with-some-BAL-activity.fit• spDR2-031_QSO-with-some-BAL-activity.fit• spDR2-032_High-luminosity-QSO.fit
http://www.sdss.org/dr5/algorithms/spectemplates/
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Image file: pixel-wavelength transformation
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Pixel 1314000Pixel 42610000
• Right click popupmenu Set Spec Start/End
Show Spectral lines• Right click Plot lines– Qso ： 8– Star ： 40– Gal ： 12
• Two aspects– Continuous spectra– Spectral lines
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Batch process• Local directory
• Spectral list file– CSV file– VOTable XML file
• Online IVOA-SSAP service
• MySQL database & Http server
• Output:– Spectra url– Template name– redshift
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
EXAMPLES FROM LAMOST
20111126 F9205 16 59 RA=121.76259DEC=7.82313r mag=18.81
SN-g 2.3SN-r 2.0QSO~Unknownred shift 1.44
SDSS spectra
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
20120219 F5597703 10 237RA=169.48717DEC=5.47571r mag=18..03
Sn-g 3.56Sn-r 5.21Star
Redshift 1.51
SDSS spectra
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
20131220 M31010N33M1 10 149
RA=8.157018DEC= 33.007835r mag=19.64
Sng=2.86Snr=3.63
Pipeline=unknown1d check=QSO
Redshift 1.22
No SDSS spectra found
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
Z=0.31 snr2 magr18.71 Z=1.31 snr 4 magr18.95
Z=1.42 snr 2~4 magr19.65 Z=1.59 SNR 9~10 magr18.06
20130914 EG020922N055910M01InputType=QSO count=790
star, no spectra galaxy no spectra
star, no spectra star ,no spectra
Z=1.94 snr 2~3 magr19.18 Z=2.71 snr 9 magr 18.92
Z=3.43 snr 2~3 magr20.03 Z=3.59 snr 2~3 magr19.68
star, no spectra SDSS spectra
star, no spectra star, no spectra
Follow up identification• Low SNR• Fake emission line
• Cross identification: SDSS • Follow observation
Software status• Version 1.0
– Used by some researchers from LAMOST extragalactic group• Software installation
– Java Virtual machine– Mac OS has JVM installed by default.
• Upgrade plan– To support more input file format, or user defined format– To develop comprehensive platform, mobile applicaion
• Email for fetching software and sending suggestions:– [email protected]
• Reference– http://adsabs.harvard.edu/abs/2013A%26C.....3...65Y– http://arxiv.org/abs/1404.6018
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra
THANKS！