Joe Collins
Campus Box 389
Boulder, CO 80303
phone: 303-492-4057
email: jcollins(at)

Astronomy 1120, Fall 2006


5775 891 Research Interests

b High-Velocity Clouds

b Interstellar and Intergalactic Media

b Diffuse Ionized Gas in Galaxies

b Gaseous Galactic Halos

Curriculum Vitae


b "Highly Ionized High-Velocity Clouds: Hot Intergalactic Medium or Galactic Halo?" Collins, J. A, Shull, J. M., & Giroux, M. L. 2005, ApJ, 623, 196.

b "Highly Ionized High-Velocity Clouds toward PKS 2155-304 and Markarian 509.'' Collins, J. A., Shull, J. M., & Giroux, M. L. 2004, ApJ, 605, 216.

b "A Survey of Far Ultraviolet Spectroscopic Explorer and Hubble Space Telescope Sight Lines through High-Velocity Cloud Complex C." Collins, J. A., Shull, J. M., & Giroux, M. L. 2003, ApJ, 585, 336.

b ``Kinematics of Diffuse Ionized Gas Halos: A Ballistic Model of Halo Rotation.''  Collins, J. A., Benjamin, R., & Rand, R. J. 2002, ApJ, 578, 98.

b ``Ionization Sources and Physical Conditions in the Diffuse Ionized Gas Halos of Four Edge-On Galaxies.'' Collins, J. A., & Rand, R. J. 2001, ApJ, 551, 57.

b ``Diffuse Ionized Gas in a Sample of Edge-on Galaxies and Comparisons with HI and Radio Continuum Emission.''  Collins, J. A., Rand, R. J., Duric, N.,  & Walterbos, R. A. M. 2000,  ApJ, 536, 645. 

Photos and Climbing Stuff