Some frequently used catalogs of galaxy pairs include

Some frequently used catalogs of galaxy pairs include -...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Some frequently used catalogs of galaxy pairs include: Holmberg 1937 (Ann. Lunds Astron. Obs. 6) - visual search, a first pass only Turner 1976 (ApJ 208, 20) - from catalog data only, real problems at faint levels due to brightest cluster members sneaking in; Peterson 1979 (ApJSuppl 40, 527) presented a similar but somewhat improved sample. Karachentsev 1972 (Soobsch. Spets. Astrof. Obs.7, 3) - complete search of PSS; radial velocities now complete Zhenlong et al. 1989 (Publ. Beijing Astron. Obs. 12, 8) - from SERC survey in southern galactic cap. A good bit of work needs to be done in comparing this with other samples. Note that what you consider an appropriate, complete, or representative catalog depends on what you hope to do with it. A catalog pure enough for mass determinations will be dreadfully incomplete for interaction studies or population statistics. These catalogs are all more or less biased toward equal-luminosity pairs. Finding faint companions suffers from strong background confusion and incompleteness. These catalogs indicate that about 10% of luminous galaxies are in two-body systems, with numbers ranging from about 11% for ellipticals to 6% for later-type spirals and irregulars. The I0 or Irr II galaxies are found almost exclusively in pairs, leading to the notion that they are transient phases seen following a tidal disturbance. Compared to overall numbers, it appears that early-type (E,S0) galaxies are overrepresented in pairs (see Sulentic's 1990 review for the Sant' Agata meeting). This extension of the morphology-density relation is interesting for theories of how pairs originated. Pairs are often used to estimate galaxy masses; if we can assume that the pair orbits in some
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/10/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

Page1 / 2

Some frequently used catalogs of galaxy pairs include -...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online