The large-scale morphology of IRAS galaxies

Details The large-scale morphology of IRAS galaxies The large-scale morphology of IRAS galaxies

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf...58b&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 58-59 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

Computerized Simulation, Galactic Evolution, Galaxies, Histograms, Infrared Astronomy, Infrared Astronomy Satellite, Many Body Problem, Centroids, Moments Of Inertia, Prolateness

Scientific paper

At present, visual inspection is the only method for comparing the large-scale morphologies in the distribution of galaxies to those in model universes generated by N-body simulations. To remedy the situation, we have developed a set of three structure functions (S1, S2, S3) that quantify the degree of large-scale prolateness, oblateness, and sphericity/uniformity of a 3-D particle distribution and have applied them to a volume-limited (less than = 4000 km/s) sample of 699 IRAS galaxies with f sub 60 greater than 1.2 Jy. To determine the structure functions, we randomly select 500 galaxies as origins of spherical windows of radius R sub w, locate the centroid of the galaxies in the window (assuming all galaxies have equal mass) and then, compute the principal moments of inertia (I sub 1, I sub 2, I sub 3) about the centroid. Each S sub i is a function of (I sub 2)/(I sub 1) and (I sub 3)/I sub 1). S1, S2, and S3 tend to unity for highly prolate, oblate, and uniform distributions, respectively and tend to zero otherwise. The resulting 500 values of S sub i at each scale R sub w are used to construct a histogram.

Affiliated with

Also associated with

No associations

Rating

The large-scale morphology of IRAS galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The large-scale morphology of IRAS galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The large-scale morphology of IRAS galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1259363