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A brief introduction of SDSS II data Liu Chengze Shanghai Astronomical Observatory.

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Presentation on theme: "A brief introduction of SDSS II data Liu Chengze Shanghai Astronomical Observatory."— Presentation transcript:

1 A brief introduction of SDSS II data Liu Chengze Shanghai Astronomical Observatory

2 SDSS I: April 2000~June 2005 EDR-DR5 SDSS II: July 2005~2008 Legacy Survey Sloan Extension for Galactic Understanding and Exploration (SEGUE) Supernova Survey

3 Legacy Survey 7,500 square degrees Northern Sky 7,500 square degrees Northern Sky 740 square degrees Southern Galactic Cap 740 square degrees Southern Galactic Cap spectra of 860,000 galaxies and 105,000 quasars. spectra of 860,000 galaxies and 105,000 quasars.

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5 SEGUE map the structure of the Milky Way Galaxy. 3,500 square degrees of new imaging: some on a regular grid through the Galactic Plane some sampling structures like the Sagittarius Dwarf Tidal Stream. 240,000 star spectra(400 plates) WD; A/BHB; G; KG; LM; AGB; MK; MD; CWD: Cool White Dwarf; FSD: F turnoff and sub-dwarf star known open cluster; Sag. dwarf stream; Monoceros Ring structure

6 SEGUE

7 Green: completed until Oct. 1 Black lines: SDSS regular imaging. Red line: Sagittarius dwarf tidal stream Magenta lines: Monoceros dwarf tidal stream ( cross M31.) Blue circles: Galactic structure plate pairs Yellow circles: 'special plates ’

8 SEGUE data: spectra plates (counts) 144 plates (counts) ~100 have 1d spectra ~100 have 1d spectra ~90 plates have been processed (seinfo*) ~90 plates have been processed (seinfo*) position, proper motion, radial velocity, [Fe/H], Teff, distance (estimates based on type) position, proper motion, radial velocity, [Fe/H], Teff, distance (estimates based on type) 3w_live/plateList.html 3w_live/plateList.html 3w_live/plateList.html 3w_live/plateList.html 178 plates Oct plates Oct 27 1d spectra 1d spectra _23/ _23/ _23/ _23/

9 SEGUE data: imaging 50% in March 50% in March  "Data Processing: Status"  "List of Imaging Runs" ( )  "Data Processing: Status"  "List of Imaging Runs" ( ) stripe > 200.and. stripe = 72, 79, 90 stripe > 200.and. stripe = 72, 79, 90 CAS, DAS CAS, DAS

10 DR6 Release to collab Apr. 1, 2007 Release to collab Apr. 1, 2007 Release to public July. 1, 2007 Release to public July. 1, 2007 Stellar atmosphere parameters for stars; Spectra; Imaging …… Stellar atmosphere parameters for stars; Spectra; Imaging ……

11 SN Survey Three months (Sep.~Nov.) per year, repeatedly scans a 300 square degree area. Three months (Sep.~Nov.) per year, repeatedly scans a 300 square degree area. Stripe 82: Stripe 82: 2.5 x 120 deg RA=[-60,60] DEC=[-1.2,1.2] Galactic coordinates Equatorial coordinates

12 SN survey At least 100 imaging of 82 stripe (Oct. 26) At least 100 imaging of 82 stripe (Oct. 26) candidates/index.html candidates/index.html candidates/index.html candidates/index.html candidates candidates 476 typed (Oct. 25) 476 typed (Oct. 25) Imaging, follow up imaging (fits) Imaging, follow up imaging (fits) Spectra, follow up spectra Spectra, follow up spectra Light curve Light curve

13 DRSN1 imaging from Sep. 1, 2005 ~ Dec. 1, 2005 imaging from Sep. 1, 2005 ~ Dec. 1, 2005 Run-list: DRSN1_run_list.html Run-list: DRSN1_run_list.htmlhttp://www.sdss.org/drsn1/ DRSN1_run_list.htmlhttp://www.sdss.org/drsn1/ DRSN1_run_list.html Data: DASsn Data: DASsnhttp://das.sdss.org/DRSN1-cgi-bin/ DASsnhttp://das.sdss.org/DRSN1-cgi-bin/ DASsn Corrected frame: fpC Corrected frame: fpC uncalibrated object catalogs: fpObjc uncalibrated object catalogs: fpObjc

14 Thank you!


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