Galaxy Distances Astronomy 274

Click here to start

Table of contents

Galaxy Distances Astronomy 274

Why measure distances?

Distance Ladder

Galaxies are not distributed randomly (why we cannot use redshifts to estimate distances)

Local Group of Galaxies

Local Supercluster

Slide 7

Redshift Survey

Cepheid Variable Stars One of the most accurate distance estimators

Slide 10

Observing Cepheid Variable Stars with HST

Slide 12

Sources of Error

Slide 14

Tully-Fisher Relation

Slide 16

The Physical Basis of the Tully-Fisher Relation

The Physical Basis of the Tully-Fisher Relation (con’d)

Tully-Fisher Relation (con’d)

Calibration of the Tully-Fisher Relations and Hubble Constant Sakai et al. 2000 ApJ in close collaboration with Jeremy Mould (MSSSO, NOAO), Shaun Hughes (Cambridge), John Huchra (Harvard), Lucas Macri (Harvard) and Robert Kennicutt (Arizona)

Tully-Fisher Relation Data

NGC 4535

Extinction Spiral galaxies have lots of dust in them!

Internal Extinction in Spiral Galaxies

Interstellar Dust Reddening

Redshift (k) correction

Tully-Fisher Relation for (late-type) Spiral Galaxies

Tully-Fisher: mostly uses Late-Type spiral galaxies

Calibration of the Multi-lTF Relations

Slide 30

Tully-Fisher Relations and H0

Uncertainties in H0 : RANDOM ERRORS

Uncertainties in H0: SYSTEMATIC ERRORS

Cluster Population Incompleteness (Malmquist) Bias

Malmquist Bias

Slide 36

Type Ia Supernovae

Slide 38

SNIa Distances

TheTip of the Red Giant Branch as a Distance Indicator

Red Giant Branches of Globular Clusters

Surface Brightness Fluctuations (SBF)

Slide 43

Other indicators:

Author: matt a malkan



Further information:
Shoko Sakai's lectures for Astronomy 274 class on Galaxy Distances: What Works