asgc statewide symposium april 18, 2009. tracing the intergalactic medium: qso absorption spectra...
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ASGC Statewide Symposium April 18, 2009
ASGC Statewide Symposium April 18, 2009
Tracing the Intergalactic Medium: QSO Absorption Spectra and Galaxy Redshifts
Allison Strom1, Jill Bechtold1, Buell Jannuzi21University of Arizona, 2National Optical Astronomy Observatory
ASGC Statewide Symposium April 18, 2009
Introduction
• Gaseous and luminous matter interact and affect formation of large scale structure throughout history of universe
• Broad, “brute force” approach: take census of everything there
• Detection and observation– Stars directly observed
– Gas indirectly observed, requires external light source
70 Mpc
Z = 6
Z = 2
Z = 0
Evolution of galaxies, stars, galaxy clusters <==> dark matter environment
V. Springel
Univ. Colorado, Boulder
ASGC Statewide Symposium April 18, 2009
Womble, Sargent, and Lyons 1996
Bahcall, Jannuzi, Schneider, Hartig, Bohlin, & Junkkarinen 1991
Q1422+2309z = 3.63
Keck I and HIRES
3C 273z = 0.158
HST and FOS
ASGC Statewide Symposium April 18, 2009
Q0107-025
Morris and Jannuzi, 2006
ASGC Statewide Symposium April 18, 2009
Deimos and Galaxy Redshifts
Obj. 30341Slit 065z = 0.20432
ASGC Statewide Symposium April 18, 2009
Deimos and Galaxy Redshifts
Obj. 29409Slit 044z = 0.71960
ASGC Statewide Symposium April 18, 2009
Deimos and Galaxy Redshifts
Obj. 33050Slit 054z = 0.89900
ASGC Statewide Symposium April 18, 2009
Deimos and Galaxy Redshifts
Obj. 24584Slit 021z = 0.65294
N. Crighton
ASGC Statewide Symposium April 18, 2009
Looking Forward and Looking Back
• Identify serendipitous observations
• Catalog Ly absorption lines– Redshift
– Column density
• Correlate absorption features and absorbers– Two-point correlation function
– “Nearest neighbor” approximation
Special thanks to Michael Cooper and Neil Crighton