Masses of Other Galaxies using HI line observations

In this exercise, you will examine the HI properties, including mass, of several galaxies observed as part of the Arecibo Legacy Fast ALFA (ALFALFA) survey and Arecibo LBW followup.

Examples from the ALFALFA survey

UGC 7260     ALFALFA spectrum     Link to SDSS image

UGC 7849     ALFALFA spectrum     Link to SDSS image

UGC 8159     ALFALFA spectrum     Link to SDSS image    

UGC 8408     ALFALFA spectrum     Link to SDSS image

UGC 8573     ALFALFA spectrum     Link to SDSS image    

AGC 215141     ALFALFA spectrum     Link to SDSS image

AGC 215426     ALFALFA spectrum     Link to SDSS image

AGC 226056     ALFALFA spectrum     Link to SDSS image To read further about AGC 226056, check out this description of ALFALFA observations of Virgo HI21.

Example of galaxy identified as likely candidate to have HI, followed up by the PHY 100 2018 class on Oct 4, 2018

AGC 333430     LBW spectrum (Oct 4, 2018)     Link to SDSS image   

Last updated Oct 20, 2020