14 May 2003Scientific Use Cases - Masahiro Tanaka1 Scientific Use Cases to be implemented to IVOQL Masahiro Tanaka and JVO team (NAOJ) IVOA Interoperability.

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Presentation transcript:

14 May 2003Scientific Use Cases - Masahiro Tanaka1 Scientific Use Cases to be implemented to IVOQL Masahiro Tanaka and JVO team (NAOJ) IVOA Interoperability 14 May 2003

Scientific Use Cases - Masahiro Tanaka2 Major Query items Fundamental dimensions position with coordinate system wavelength time flux / apparent magnitude Other parameters redshift distance (from parallax / photometric / redshift) absolute magnitude … Attributes object names object types (star / galaxy / …) instrument (telescope / detector / filter / …) …

14 May 2003Scientific Use Cases - Masahiro Tanaka3 Use Cases 1.Follow-up 2.Search for particular objects 3.Search for moving objects 4.Line matching

14 May 2003Scientific Use Cases - Masahiro Tanaka4 Use Case 1: Follow-up Obtain supplemental data of objects you have observed Targets Gamma-ray burst Super Nova AGN … Query Position Time Cross-match

14 May 2003Scientific Use Cases - Masahiro Tanaka5 Example of Query for Follow-up data select y.id, c.ra, c.dec, c.vmag from public_catalog c, your_data y, where XMATCH(c, y) < 5 arcsec and c.obs_time between TIME(“ :00:00”) and TIME(“ :00:00”)

14 May 2003Scientific Use Cases - Masahiro Tanaka6 Use Case 2: Search for particular objects Find unknown objects with particular features Targets Brown dwarf Gravitational lens Metal-poor stars Binaries, Planetary systems … Query Color / Line Cross-match

14 May 2003Scientific Use Cases - Masahiro Tanaka7 Example of search for brown dwarf candidate Brown dwarf can be observed in IR, not in Visual select i.id, i.ra, i.dec, i.kmag from ir_cat i, visual_cat v where XMATCH(i !v) < 5 arcsec and i.jmag - i.kmag > 1

14 May 2003Scientific Use Cases - Masahiro Tanaka8 Use Case 3: Search for moving objects Targets Asteroid Comet … Query Position Time Cross-matching

14 May 2003Scientific Use Cases - Masahiro Tanaka9 Example of search for moving objects select c1.ra, c1.dec, c1.vmag, c2.ra, c2.dec, c2.vmag from cat1 c1, cat2 c2 where XMATCH(c1, !c2) < 30 arcsec and XMATCH(!c1, c2) < 30 arcsec and ABS(c1.vmag - c2.vmag) < 2 cat1cat2

14 May 2003Scientific Use Cases - Masahiro Tanaka10 Use Case 4: Line matching select m.molecule, m.mode, m.frequency, y.strength from your_data y, lte_model_20K m where LINEMATCH(y, m) < 0.1 GHz and y.sn > 3 LINEMATCH can work with Doppler shift. more than ABS(m.frequency - y.frequency) < 0.1 GHz

14 May 2003Scientific Use Cases - Masahiro Tanaka11 Summary of Use Cases Cross-match is essential for astronomical use XMATCH: in position LINEMATCH: in wavelength or frequency

14 May 2003Scientific Use Cases - Masahiro Tanaka12 Data analysis How to query if columns are not provided? e.g., only images/spectra are provided  Data analysis function will be needed Data analyses: source/line extraction morphology analysis classification data mining Open question: VOQL supports data analysis?