Top row: SARA Arp 65 data from July 8, 2005.
Next row: SARA Arp 65 data from July 8, 2005 + Oct 9/11, 2005.
These images were obtained with the new U55 CCD on SARA. North is up and east to the left.

7/8/05	Arp65	671nm	5X600sec	clear
10/11/05	Arp65	671nm	5X600sec	clear
7/8/05	Arp65	R	3X600sec	clear
10/9/05	Arp65	R	4X600sec	clear

First/Left: Smoothed SARA R band image of Arp 65 from July 8, 2005, with contours from the smoothed continuum-subtracted H-alpha map superimposed. Note the artifacts from imperfect continuum subtraction. Second/Right: The Arp Atlas broadband optical image of Arp 65, to the same scale. Note that the H-alpha clumps in the western galaxy have counterparts in the Arp image. Note also that these three clumps are very red in the Spitzer 3.6+8 micron Spitzer image, indicating that they have very young stellar populations.

3/29/04	Arp89	659nm	11X600sec	clear
3/29/04	Arp89	R	4X600sec	clear

Continuum-subtracted smoothed H-alpha map of Arp 89 with R band contours superimposed. Star formation is observed in the nuclear regions of the two galaxies, as well as a concentration to the lower left (southeast) of the nucleus of the smaller galaxy.

1/18/05	Arp202	664nm	14X600sec	clear? hazy? quarter moon
1/18/05	Arp202	R	5X600sec	clear? hazy? quarter moon

Continuum-subtracted H-alpha map of Arp 202 with R band contours superimposed. North is up and east to the left.

For Arp 285 SARA images, click here.

R band image of Arp 283

Galaxy	Date	Filter	#Images & Exposure Time	Notes
Arp 283	1/16/07	R	4 images at 600 seconds.	Weather was clear.

Galaxy	Date	Filter	#Images & Exposure Time	Notes
Arp 283	1/16/07	659	5 images at 600 seconds.	Weather was clear.

Arp 283 continuum-subtracted H-alpha region.

Arp 283 continuum-subtracted H-alpha region with R band contours.
January 16, 2007

Left: the SARA continuum-subtracted H-alpha map of Arp 181. Both the contours and color are H-alpha.
Right: the SARA H-alpha map (contours) on the SARA R image.
Note that the `third galaxy' marked in the GALEX image above *IS* detected in H-alpha, indicating that it is at the same redshift as Arp 181. The more eastern galaxy in Arp 181 is well-detected in H-alpha, with the spiral arms visible. The nucleus of the second Arp 181 galaxy may also be detected in H-alpha, but not the disk. Note that there are some artifacts due to imperfect continuum subtraction near the stars to the northwest of the second galaxy. Note also that the faint tail and the clump at the end of the tail are not detected in H-alpha.

3/12/05	Arp 107	R	6x600sec	cloudy, crescent moon
3/12/05	Arp 107	678nm	17x600sec	cloudy, crescent moon
3/12/05	Arp 107	B	5x600sec	cloudy, crescent moon
3/12/05	Arp 107	V	5x600sec	cloudy, crescent moon

Grey scale broadband R, V, and B images of Arp 107. Note the apparent `double bridge' in V and R.

Continuum-subtracted H-alpha map of Arp 107 (color), with R band contours superimposed. Only four sources are detected in H-alpha: the nucleus of the main galaxy (which is a Seyfert 2 galaxy), clumps #10, #21, and #26 (labeled as in the Spitzer web page), from west to north counterclockwise around the ring. Note that the bright source inside of the radius of the ring (#9 in the Spitzer listings) subtracted completely away, as did the nucleus of the companion. See the Spitzer images for comparison.

3/29/04	Arp72	664nm	9X600sec	clear
3/29/04	Arp72	R	2X600sec	clear

Continuum-subtracted smoothed H-alpha map of Arp 72 with R band contours superimposed.

4/15/04	Arp305/N4016	R	3x600sec	clear
4/15/04	Arp305/N4016	664nm	13x600sec	clear

Zoomed-in continuum-subtracted H-alpha map of Arp 305/NGC 4016 with R band contours superimposed. H-alpha is detected inside NGC 4016. To be published in Hancock et al. 2009 (submitted to the Astronomical Journal).

Larger field-of-view continuum-subtracted H-alpha map of Arp 305/NGC 4016 with R band contours superimposed. A knot of H-alpha may also be detected in the bridge, far from the two galaxies (lower right of image = southeast). This knot is also visible in the Arp Atlas photograph.

4/18/04	Arp305/N4017	R	3x600sec	clear
4/18/04	Arp305/N4017	664nm	6x600sec	clear

The continuum-subtracted H-alpha map of Arp 305/NGC 4017. No H-alpha was detected from the bridge source in this shorter integration time H-alpha image.

The R band image of Arp 120

Galaxy	Date	Filter	#Images & Exposure Time	Notes
Arp 120	1/16/07	R	4 images at 600 seconds.	Weather was clear.

The final H-alpha+continuum image of Arp 120 (rotated from that shown above).

Galaxy	Date	Filter	#Images & Exposure Time	Notes
Arp 120	1/16/07	659	6 images at 600 seconds.	Weather was clear.

The left image is the continuum-subtracted H-alpha region of the Arp 120 system. The second picture is the same image with R band contours.
January 16, 2007

This is the smoothed continuum-subtracted H-alpha image of Arp 120.
January 16, 2007
Note that Kenney et al. (1995) saw the same filamentary structure in their H-alpha+[NII] image of NGC 4438.

1/18/05	Arp271	R	3x600sec	clear
1/18/05	Arp271	664nm	9X600sec	clear

Continuum-subtracted smoothed H-alpha image of Arp 271 (NGC 5426/7) with R band contours superimposed. North is up and east to the west. Note the HII region in the bridge, as well as the large concentration of star formation in the distorted western spiral arm of the northern galaxy NGC 5427.

6/20/04	Arp297	R	7x600sec	clear
6/20/04	Arp297	664nm	10X600sec	clear

Continuum-subtracted smoothed H-alpha image of Arp 297 with R band contours superimposed. The only definite detection is of the small companion to the larger galaxy (NGC 5755) in the lower part of the image.

The final R band image of Arp 261

Galaxy	Date	Filter	#Images & Exposure Time	Notes
Arp 261	2/15/07	R	3 images at 600 seconds.	Weather was clear.

The final H-alpha+continuum image of Arp 261.

Galaxy	Date	Filter	#Images & Exposure Time	Notes
Arp 261	2/15/07	659	3 images at 600 seconds.	Weather was clear.

The left picture is the continuum-subtracted H-alpha map of the Arp 261 system. The right picture is of Arp 261 in H-alpha with R band contours.

9/21/04	Arp282	R	3x600sec	clear
9/21/04	Arp282	664nm	5x600sec	clear

The smoothed continuum-subtracted H-alpha image of Arp 282, with R band contours superimposed. H-alpha is only detected within the inner disks of these galaxies, and a small concentration at the base of the tail extending to the left in the uppermost (northern) galaxy (NGC 169). Note the very bright star off the edge of the CCD, which strongly affects this image.

11/11/04	Arp290	R	3x600sec	cloudy
11/11/04	Arp290	664nm	16x600sec	cloudy

The smoothed continuum-subtracted H-alpha image of Arp 290, with R band contours superimposed. H-alpha is clearly detected in the outer disk of the uppermost (more northern) galaxy (IC 196), and possibly near the center as well.

12/18/04	Arp279	R	5X600sec	clear, quarter moon
12/18/04	Arp279	659nm	13X600sec	clear, quarter moon

The continuum-subtracted H-alpha image of Arp 279.

12/18/04	Arp82	R	5X600sec	clear, no moon
12/18/04	Arp82	659nm	16X600sec	clear, no moon

The smoothed continuum-subtracted H-alpha image of Arp 82, 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.

Last updated by B. J. Smith 8/4/08