Obtained by Beverly Smith, Department of Physics, Astronomy, and Geology, East Tennessee State University
Left: R band image of the ring galaxy Arp 147. Right: continuum-subtracted H-alpha image. These were obtained November 20, 2003. The H-alpha image was obtained with a 70nm-wide redshifted H-alpha filter centered at 678 nm. The R band image is the median of four 10-minute exposures. The H-alpha image is the median of nine 10-minute exposures.
Left: An R-band image of the NGC 4410 group, from the SARA telescope. This image was obtained April 18, 1999, and the total integration time was 40 minutes. Right: The same image, with the stretch set such that tidal features are visible. This image has appeared in Smith et al. (2003), Astronomical Journal, 126, 1763, Donahue, Smith, and Stocke (2002), Astronomical Journal, 123, 1922, and Smith (2000), Astronomical Journal, 541, 624. To see some other images of this system from the Chandra X-ray telescope, the Hubble Space Telescope, and other telescopes, click here.
A continuum-subtracted smoothed H-alpha map of Arp 72 (NGC 5994/6) with R band contours superimposed. These observations were made on March 29, 2004, with a total of 20 minutes on R and 90 minutes on the 664 nm redshifted H-alpha filter.
A continuum-subtracted H-alpha map of NGC 4016 with R band contours superimposed. NGC 4016 is one of two galaxies in the interacting pair Arp 305, along with NGC 4017. This pair is larger than the 9' field of view of the SARA image, so the two galaxies were observed separately.
A continuum-subtracted H-alpha map of the second galaxy in Arp 305, NGC 4017, with superimposed R band contours. These data were obtained on April 18, 2004, with a total 30 minutes on R and 1 hour on the 664 nm redshifted H-alpha filter.
A larger field-of-view view of the continuum-subtracted H-alpha image of NGC 4016 with R band contours superimposed. A knot of H-alpha (lower right of image) is detected between the two galaxies, in a faint bridge connecting the galaxies.
The continuum-subtracted H-alpha image of Arp 279 (NGC 1253), with R band contours superimposed. These observations were made on December 18, 2004, and include a total of 50 minutes on R and 2 hours 10 minutes on the 659 nm redshifted H-alpha filter.
The smoothed continuum-subtracted H-alpha image of Arp 82 (NGC 2535/6) from SARA, with R-band contours superimposed. H-alpha is seen throughout the disk of NGC 2535 (the larger galaxy to the north), the inner disk of NGC 2536, along the bridge, and at the base of the northern tail of NGC 2535. A possible clump of H-alpha is also seen at the end of the northern tail. This image was obtained December 18, 2004, with a total integration time in R of 50 minutes, and in the 664 nm redshifted H-alpha filter 2 hours 40 minutes.
This image was used in Hancock et al. 2007, AJ, 133, 791, where it was compared to GALEX ultraviolet and Spitzer infrared images.
See the Arp 82 web page and the press release for more information.
A smoothed continuum-subtracted H-alpha image of Arp 271 (NGC 5426/7), with R-band contours superimposed. North is up and east to the left. The HII regions tend to trace the spiral arms. Note the the star formation region in the bridge between the galaxies. Note also the large HII region complex in the distorted western spiral arm of the northern galaxy NGC 5427.
A smoothed continuum-subtracted H-alpha image of Arp 107.
The SARA H-alpha and R images of NGC 2856, the northern galaxy of Arp 285. The H-alpha is superimposed on the Spitzer 8 micron and SDSS g images in the last two panels. This image has appeared in Smith et al. (2008), Astronomical Journal, in press. To see more images of Arp 285 from various telescopes, click here.
To return to Beverly Smith's web page, click here.
Last updated 4/1/08