Identifying and Classifying the Galaxies of the High Redshift Cluster 2192

Patricia Mutunga (with Fana Mulu) Advisors: Eric Wilcots Marc Verheijen

Outline of talk

•Introduction•Motivation•The project•Conclusion•Acknowledgement

Motivation

Eric Wilcots - NSBP-students conferenceMarc and Eric - mini lecturesQuestions :How do galaxies form? Do clusters form from field galaxies? Have they evolved significantly since their formation? Is their morphological type an indication of their age?

Introduction

This project entails the search for, and study of, galaxies in the rich cluster of galaxies Abell 2192 at very large distances ( i.e. at High Redshift).

Abell 2192

FLOW CHART FOR DATA PROCESSING

SExtractor

Separate stars & galaxies

GIPSY/copy

CCD mosaic image of Abell 2192

221 “postagestamp” images

Basic sample of 221 galaxies

Remove stars & other galaxies

GIPSY/blot

Geometric parameters

Master Table!

Photometric parameters

Morphologies

GIPSY/ellint

External knowledge

GIP

SY

/ellf

it

The Project•CCD mosaic image of Abell 2192 - courtesy of Marc

•Executed SExtractor

•To separate the stars and galaxies

•Basic sample of 221 galaxies

•copy feature in GIPSY to make “postage stamp” images

•Blot feature in GIPSY to remove tars and other galaxies

•GIPSY and ellfit fitted in ellipses onto the galaxies to get

geometric parameters

•GIPSY and Ellint to get photometric parameters

•External knowledge-atlases and text books: morphologies

•All the steps led to The Master Table!

GIPSY

Ellint

Examples

LP in R band LP in B band

Geometric Parameters and Photometric parameters

• GIPSY and ellfit fitted in ellipses onto the galaxies to get geometric parameters• GIPSY and Ellint to get photometric parameters• External knowledge-atlases and text books: morphologies• All the steps led to The Master Table!

Luminosity Profiles

Luminosity Profiles

Magnitude and Colour graph

Radio detection

Conclusions

•Our objective was reached.

•I learned a lot!

Acknowledgements

•Thank God

•Thank Eric and Marc

•Fana too!

•All the REU students!

copy feature in GIPSY to make “postage stamp” imagesBlot feature in GIPSY to remove tars and other galaxiesGIPSY and ellfit fitted in ellipses onto the galaxies to get geometric parametersGIPSY and Ellint to get photometric parametersExternal knowledge-atlases and text books: morphologiesAll the steps led to The Master Table!