• Home
• About
• Data
• Contacts/Links

Using the Arecibo L-band Feed Array (ALFA) at the Arecibo Radio telescope, this project mapped the neutral Hydrogen (HI) in and around galaxy NGC 2903. Questions of interest include:

• Is there an extended HI disk around the galaxy?
• Are there small HI clouds or companions that have not yet been detected? What might their spatial and mass distributions be like?
• What is the relationship between HI disks and the more distant Lyman alpha systems?
• Is it possible to see declining rotation curves in faint outer HI emission?

Answering these questions requires a very sensitive telescope with long integration times; the precursor project with ALFA was awarded 100 hours of telescope time, for which a paper (pdf link) has been produced and from which the data are now available.