Kelsey Johnson (P.I.; UVa), John Hibbard (NRAO), Sarah Gallagher
(UCLA), Ann Hornschemeier (GSFC), Jane Charlton (PSU),
Amanda Heiderman (NRAO-REU), et al.
Above: falsecolor represenation of IRAC 3.6um (blue),
4.5um (green), and 8um (red) images for HCG 07
This project involves Spitzer IRAC 3.6-8um and MIPS
24um observations of a sample of 12 nearby
Hickson Compact Groups, chosen to sample a range of evolutionary
stages. There are many aspects of this project, with different
people in the above list taking charge of various scientific
topics. My interest is in using the mid-IR indicators of
activity to understand the evolution of the neutral hydrogen
content. According to the evolutionary
scenario of Verdes Montenegro et al. (2001), in less
evolved compact groups the neutral
hydrogen is normal or mildly deficient (compared to isolated
spirals of similar Hubble Type and luminosity). In the
intermediate
stages, the HI is drawn into tidal features, and the
group as a whole is deficient in HI. In the late stages, the
spirals are highly deficient, and there is often an X-ray
intergroup medium. I believe that studying this sequence will help
us understand how star formation may be abruptly truncated
as galaxies evolve, as suggested by some recent observations.
- Related Websites
- Paul
Hickson's Compact Group webpage (through 1998) [DEFUNCT]
- Lourdes
Verdes Montenegro's website of Compact Groups
- Spitzer/GALEX/SARA Spiral, Bridge & Tail Interacting Galaxy Sampl (Bev Smith)
-
An HI Rogues Gallery, see esp.
Figs.
154-162.
- Publications
- Galaxy Evolution in a Complex Environment: A Multi-wavelength Study of HCG 7,
Konstantopoulos, I. S. et a.,
2010, ApJ, 723, 197
(astro-ph/1007.3523)
- Mid-infrared Evidence for Accelerated Evolution in Compact Group Galaxies,
Walker, Lisa May, Johnson, K.E., Gallagher, S. C., Hibbard, J. E.,
Hornschemeier, A. E., Tzanavaris, P., Charlton, J. C., Jarrett, T. H.
2010, AJ, 140, 1254
(astro-ph/1008.4581)
- Hierarchical Structure Formation and Modes of Star Formation in HCG 31, Gallagher,
S.C. et al., 2010, AJ, 139,
545
- The Revealing Dust: Mid-Infrared Activity in Hickson Compact
Group Galaxy Nuclei, Gallagher, S. C., Johnson, K. E.,
Hornschemeier, A. E., Charlton, J. C. & Hibbard, J. E.
2008, ApJ, 673, 730
(astro-ph/0710.0372)
- The Infrared Properties of Hickson Compact
Groups, Johnson, K. E., Hibbard, J. E., Gallagher, S. C.,
Charlton, J. C., Hornschemeier, A. E., Jarrett, T. H. & Reines, A. E.
2007, AJ, 134, 1522
(astro-ph/0706.4461)
- Sarah's presentation at NNG
-
John's ppt presentation
from the ESO Workshop
"Groups of galaxies in the nearby Universe", December 5-9 2005,
- Amandas presentation at 207th AAS
- Kelsey's presentation at 207th AAS
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Maintained by
jhibbard
@ nrao.edu
Last modified: Tue Dec 13 11:12:48 EST 2005