The connection between Lyman-alpha absorption in low-redshift quasars and intervening galaxies Johen Liske Tutor: Alizera Aghaee, Begona Ascaso Angles,

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Presentation transcript:

The connection between Lyman-alpha absorption in low-redshift quasars and intervening galaxies Johen Liske Tutor: Alizera Aghaee, Begona Ascaso Angles, Ryan Houghton, Yuri Bialetski

What are quasars ? The first quasar (3C273) was discovered in 1963 Quasars are small, compact, powerful and extremely remote objects Observed luminosity is approximately 10 - 1000 times that of a normal galaxy

Lyman Alpha Absorption Quasars emit strongly in the Lyman alpha We observe the spectrum shifted to longer wavelengths Light is absorbed by gas located between us and the quasar

spectroscopic database What sort of data do we need ? Large homogeneous spectroscopic database of low-redshift QSO’s Large homogeneous database of galaxies HST, Faint Object Spectrograph (FOS) Sloan Digital Sky Survey

What are the options?

We can use … 1. RAW data 2. Reduced data 3. Analysed (higher-level) data

Go to the Archive … … and get High-Level data !!!

Method Overview Search for homogenous archive of QSOs Online archive of HST (FOS) QSO spectra compiled by Bechtold et al. 2002 Search for large galaxy database SDSS Analyse & Cross-correlate absorbers and galaxies

Quasar archive 335 273 Locate Download Select useful data Summarize properties Table of Quasar properties Table of ‘clean’ Ly-a absorption properties 335 273

Galaxy archive 58 Locate which quasars positions in SDSS Search for spectral observations taken ‘near’ these positions (SQL search) 2o x 2o bounding box Galaxies ONLY! Extract galaxy properties from SDSS database

Analysis and Cross-correlation For each quasar calculate distance between each galaxy and each Lyman Alpha absorber (to find nearest neighbour galaxy)

Can’t be related

Conclusions We found 6 galaxies which are likely to be associated with Lyman Alpha absorbers For these six: EW ~ r  -0.64 ± 0.1 (consistent with literature) Relation holds up to r  ~ 1 Mpc !! However 4 of our pair are derived from one quasar spectrum (Q1226+0219) which is also used in Penton et al. We need wider, deeper galaxy surveys to match the depth of the quasar archive (SDSS not finished)

Summary Compiled list of ‘clean’ Ly-a absorption lines in QSO spectra Locate galaxies near QSO coordinates and extract their properties Cross correlate and analyse: Find nearest galaxy to each Ly-a absorption line Study correlation between absorber and galaxy properties EW ~ r  -0.64 ± 0.1