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2005-09-14NVO Summer School, Aspen, Colorado1 Finding and Exploring Merging Pairs of Galaxies in 2MASS using the NVO Sahar Allam, Perry Gee, Yeong Loh,

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NVO Summer School, Aspen, Colorado1 Finding and Exploring Merging Pairs of Galaxies in 2MASS using the NVO Sahar Allam, Perry Gee, Yeong Loh,

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Presentation on theme: "2005-09-14NVO Summer School, Aspen, Colorado1 Finding and Exploring Merging Pairs of Galaxies in 2MASS using the NVO Sahar Allam, Perry Gee, Yeong Loh,"— Presentation transcript:

1 NVO Summer School, Aspen, Colorado1 Finding and Exploring Merging Pairs of Galaxies in 2MASS using the NVO Sahar Allam, Perry Gee, Yeong Loh, Ivanio Puerari, Douglas Tucker

2 NVO Summer School, Aspen, Colorado1 Goals Use the NVO to identify (relatively) isolated merging pairs of galaxies from the 2MASS eXtended Source Catalog (XSC) Perform exploratory research into the properties of the pairs and their member galaxies (NIR, Optical, Radio, X-Ray) – Existence of hot or cold gas surrounding individual pairs – Star Formation/AGN Properties (e.g., like in Chris's and Simon's talks)

3 NVO Summer School, Aspen, Colorado1 Finding Merging Pairs in 2MASS Used Open Sky Query to download 125 sq deg of data (ra, dec, J, H, Ks, rext, flags) from the photoXSC table in the TWOMASS database D>20xs s<4d i i j Modified Karachentsev Criteria

4 NVO Summer School, Aspen, Colorado1 The Catalog (SDSS astrotools) 91 candidate merging pairs in 125 sq deg – some are garbage (~10%) DEC RA +1.25° ° - 0° 50°

5 NVO Summer School, Aspen, Colorado1 Image Gallery (Optical/SDSS SkyServer)

6 NVO Summer School, Aspen, Colorado1 Image Gallery (Opt.,NIR, Radio/SkyView)

7 NVO Summer School, Aspen, Colorado1 Image Gallery (NIR & Radio/SkyView) image: 2MASS Ks; red contours: FIRST

8 NVO Summer School, Aspen, Colorado1 Photometric Properties (NIR/TOPCAT) concordance in Ks magnitude? Ks (galaxy 1) Ks (galaxy 2)

9 NVO Summer School, Aspen, Colorado1 Photometric Properties (TOPCAT) SDSS g-r vs u-g 2MASS H-Ks vs J-H 2MASS J-H vs SDSS i-z GALEX nuv – fuv u- g i-z fuv mag J- H g- r H-Ks J- H

10 NVO Summer School, Aspen, Colorado1 Redshifts (matches with SDSS) redshift Number 0 18

11 NVO Summer School, Aspen, Colorado1 Spectra (SDSS) Pai r z= z= dv ~ 150 km/s

12 NVO Summer School, Aspen, Colorado1 Spectral Classfication (Open Sky Query) SELECT t.ra, t.dec,t.pairid,t.objid,t.matchobjid, s.specobjid, s.z,s.zerr,s.zWarning, s.velDisp, s.velDispErr, s.specClass, s.eClass, s.plate,s.fiberID, l.height, l.sigma, l.wave,l.restWave,l.z FROM SDSSDR3:PhotoPrimary o, SDSSDR3:SpecObj s,SDSSDR3:SpecLine l, Mydata:MergePair t WHERE o.specobjid = s.specobjid and l.specobjid = s.specobjid and XMATCH(o, t) < 3.5 and s.zWarning=0 and l.restWave between and ORDER BY t.pairid

13 NVO Summer School, Aspen, Colorado1 Spectral Classification ( TOPCAT/IDL) log [N II] / [Halpha] log [O II] / [Hbeta] AGN Starburst s

14 NVO Summer School, Aspen, Colorado1 Future AstroGRID or other GRID resources to do full 2MASS XSC (all-sky) Move from web-based to command-line- based queries NVO Research Initiative proposal? (Oct 1!)

15 NVO Summer School, Aspen, Colorado1 Extra Slides

16 NVO Summer School, Aspen, Colorado1 Tools Open Sky Query – download 2MASS XSC data – match 2MASS merging pair galaxies with SDSS, FIRST, XMM, ROSAT, and GALEX catalogs Topcat and VOPlot – analyze photo. and spectro. properties of pairs SkyView – obtain 2MASS, FIRST, and X-ray images of pairs SDSS SkyServer – obtain optical images of pairs

17 NVO Summer School, Aspen, Colorado1 2MASS Merging Pairs at z>0.2


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