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ELAIS SEDS

This page contains information on how to convert the ELAIS final merged band catalog photometric measurements into a Spectral Energy Distribution (SED), and make the results available via the SSA protocol.

This file contains a detailed description of the steps involved. The files and worked examples described in the text are all attached below.

Update to ELAIS SEDs. December 22, 2004

The process for generating SEDs from the ELAIS catalogue, including test files, RED, BLUE and ERO object subsets has been updated. See the ReadMe for all the details.

Note that a tar file containg all the Dec 22 update files is available at the end of the list of files.

First stab at a Groovy translation

At the moment, it's framed as a script that you run from the commandline - just like the original IDL. Later we need to work out how we want to chop it up, put it in a workflow, and attach it to cea tools and myspace.. But for now, this script proves the feasability of doing the processing in groovy.

To execute the script, you'll need to download and install the astrogrid commandline bundle - http://software.astrogrid.org/client-install.html

Differences:

  • The groovy script starts with the votable returned from Vizier, rather than the pre-cooked .dat files used by IDL. I think this is a bonus.
  • The output generated by the groovy translation is pretty close to the original - in places the files produced by groovy contain numbers with a larger number of decimal places, but the values are the same (modulo rounding)
  • The generated votables are similar, but have som minor differences too. Could someone test the generated files by feeding them into whatever they're meant to go into next, and let me know if there are any problems.

Unsure of..

There's just a few places where I'm unsure of things - I've commented the bits with 'Mark' - to make it easer for you to grep though. In particular
  • Whether I'm extracting coordinates from the votable in the correct format. The IDL input files have different columns to the vizier votable.
  • There's one point where the IDL script uses the function 'alog10'. Groovy/Java doesn't provide base-10 logs, only natural base logs. I've
put in a conversion that computes the base10 log from the base e one - but I'm very unsure about this - mathematics not being my strongest point.
  • In the original IDL, there's a bit that says.. 
; Red, z<0.5, and detected in all optical bands
group1 = where(  ((am3 - am4) gt 0.8) AND ((am2 - am3) gt 1.2) AND (spectz gt 0.0) AND (spectz lt 0.5) AND (am1 gt 0.0) AND (am1 gt 0.0) AND (am2 gt 0.0) AND (am3 gt 0.0) AND (am4 gt 0.0) AND (am5 gt 0.0) )
I was wondering whether there was a typo or omission here - as the same condition (am1 gt 0.0) occurs twice..should it be testing some other array? or is it just harmless repetition? -- NoelWinstanley - 22 Dec 2004


Galaxy Templates

As a first step to comparing the SEDs with models, it is helpful to first compare with galaxy templates. A small set of galaxy templates from Kinney and Calzetti have been made available on a URL and accessible via the following SSA file. This means that the SSA file may be loaded into the AVO prototype and the template spectra plotted in specview.

(The template files are in specview .txt format)


Attachment sort Action Size Date Uploaded by Comment
elais_seds.txt manage 11.8 K 02 Dec 2004 - 11:47 MarkAllen Constructing ELAIS Catalog SEDs
ELAIS_Vizier.VOT manage 4145.4 K 01 Dec 2004 - 17:53 MarkAllen Vizer VOTable of ELAIS catalog
elaiscat_21a_mga1.vot manage 5200.6 K 01 Dec 2004 - 17:55 MarkAllen ELAIS catalog + additionaflux converted columns
ELAISC15_J002818-424303_SED.txt manage 0.3 K 01 Dec 2004 - 17:57 MarkAllen Example Specview ascii format SED
SEDs.tar manage 3580.0 K 01 Dec 2004 - 17:59 MarkAllen Specview SEDs for ALL ELAIS catalog sources
ELAIS_sed_ssa.txt manage 1097.3 K 01 Dec 2004 - 18:00 MarkAllen SSA file describing all ELAIS SEDs
ELAIS_first1000_sed_ssa.txt manage 312.1 K 01 Dec 2004 - 18:02 MarkAllen SSA file describing first 1000 ELAIS sources
SEDs_norm.tar manage 1800.0 K 01 Dec 2004 - 18:03 MarkAllen De-redshifted, Normalised SEDs for all ELAIS sourc
ELAIS_norm_sed_ssa.txt manage 28.4 K 01 Dec 2004 - 18:05 MarkAllen SSA file describing red subset of ELAIS sources
elais_seds_IDL.tar.gz manage 244.9 K 01 Dec 2004 - 18:07 MarkAllen IDL procedures for making SEDs and SSA files
ReadMe manage 4.7 K 22 Dec 2004 - 12:16 MarkAllen Update to ELAIS SEDs December 22.
elaiscat_21a_mga3.vot manage 5197.3 K 22 Dec 2004 - 12:17 MarkAllen ELAIS catalogue fluxes (+aperture corrections)
elaiscat_21a_mga3_fluxes.vot manage 1926.8 K 22 Dec 2004 - 12:18 MarkAllen ELAIS catalogue fluxes (flux cols only)
elaiscat_21a_mga3_fluxes.txt manage 1260.6 K 22 Dec 2004 - 12:19 MarkAllen ELAIS catalogue fluxes (flux cols only)
ELAIS_RED_fluxes.vot manage 6.6 K 22 Dec 2004 - 12:20 MarkAllen RED sources (VOTable)
ELAIS_RED_fluxes.txt manage 2.1 K 22 Dec 2004 - 12:21 MarkAllen RED sources (ascii)
ELAIS_BLUE_fluxes.vot manage 54.0 K 22 Dec 2004 - 12:22 MarkAllen BLUE sources (VOTable)
ELAIS_BLUE_fluxes.txt manage 29.0 K 22 Dec 2004 - 12:22 MarkAllen BLUE sources (ascii)
ELAIS_ERO_fluxes.vot manage 6.2 K 22 Dec 2004 - 12:23 MarkAllen ERO sources (VOTable)
ELAIS_ERO_fluxes.txt manage 1.7 K 22 Dec 2004 - 12:24 MarkAllen ERO sources (ascii)
SEDs_21dec04.tar manage 3580.0 K 22 Dec 2004 - 12:25 MarkAllen Specview SEDs for ALL ELAIS catalog sources
SEDs_norm_21dec04.tar manage 1800.0 K 22 Dec 2004 - 12:25 MarkAllen De-redshifted, Normalised SEDs for all ELAIS sour
ELAIS_RED_norm_sed_ssa.txt manage 2.6 K 22 Dec 2004 - 12:27 MarkAllen SSA file of normalized RED source SEDs
ELAIS_RED_sed_ssa.txt manage 2.5 K 22 Dec 2004 - 12:27 MarkAllen SSA file of RED source SEDs
ELAIS_BLUE_norm_sed_ssa.txt manage 27.8 K 22 Dec 2004 - 12:28 MarkAllen SSA file of normalized BLUE source SEDs
ELAIS_BLUE_sed_ssa.txt manage 27.0 K 22 Dec 2004 - 12:29 MarkAllen SSA file of BLUE source SEDs
ELAIS_ERO_norm_sed_ssa.txt manage 2.2 K 22 Dec 2004 - 12:30 MarkAllen MarkAllen? SSA file of normalized ERO source SEDs
ELAIS_ERO_sed_ssa.txt manage 2.2 K 22 Dec 2004 - 12:30 MarkAllen SSA file of ERO source SEDs
ELAISC15_J161302.4542846_orignorm.png manage 32.3 K 22 Dec 2004 - 12:31 MarkAllen specview screen shot
Dec22_update_all_files.tar.gz manage 1517.3 K 22 Dec 2004 - 12:37 MarkAllen All Dec 22 update files (except IDL pro - woops)
elais_seds.pro manage 23.0 K 22 Dec 2004 - 12:50 MarkAllen Dec 22 updated version of IDL procedure
elais-groovy.tar.gz manage 1167.1 K 22 Dec 2004 - 20:30 NoelWinstanley First cut of groovy transcription.
KINNEY_TEMPLATES_SSA.xml manage 4.9 K 17 Jan 2005 - 10:38 MarkAllen SSA description of Kinney templates

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Topic revision r1.9 - 17 Jan 2005 - 10:39 - MarkAllen
Topic parents: WebHome > WorkAreas > WorkAreaOne > AvoDemo2005 > AvoDemo2005Gal 		Copyright © 2003 by the contributing authors. All material on this collaboration tool is the property of the contributing authors. Ideas, requests, problems regarding AVO TWiki ? Send feedback.