In this page, I show Color Composite images formed by combining images taken in 3 different bands. The pricipal aim is to show the distribution of star-forming (HII) regions in galaxies. Hence in most cases, H_alpha (Ha) emission line image is used as the RED band. B and V images are used to show the parent disk of the galaxies assigning them BLUE and GREEN colors respectively. In some cases Near Infra Red (NIR) JHK band images are used, where as in some other cases H_beta (Hb) and OIII 5007 Ang (Oiii) line images are used. The bands used [Blue, Green, Red] are indicated for each image. All the images included here are taken during my various observing runs over the years. Observational details are as follows:

• CCD Cameras at the 1-m and 2.34-m telescopes of the Vainu Bappu Observatory (VBO), Kavalur, T.N., India, obtained mostly as part of my Ph.D. thesis in 1991-92.
• LFOSC instrument at the 2.13-m telescope of the Guillermo Haro Astrophysical Observatory (OAGH), Cananea, Sanora, Mexico.
• JHK images using the CAMILA/NICMOS 3 camera of the Observatorio Astronomico Nacional 2.1-m Telescope at San Pedro Martir (OAN-SPM-2.1m), B.C., Mexico.

On the right is an enhanced image to show the fainter HII regions.

On the right is an enhanced image to show the fainter HII regions.

NGC 2903 [BVHa] [VBO-1m]

The center box shows the hotspots at a different intensity scale.

NGC 2997 [BVHa] [VBO-1m]

Only the North-east arm is covered by the CCD. The center box shows the hotspots at a different intensity scale.

NGC 4449 [BVHa] [VBO-2.3m]

NGC 4656 [BVHa] [VBO-2.3m]

Only the North-east arm is covered by the CCD.

NGC 5253 [BVR] [OAGH-2.1m]

NGC 972 [BVJ & BKHa] [VBO-2.3m & OAN-SPM-2.1m]

The image on the right is around 1.5 times magnified wrt that on the left.

SN 1998bu in NGC 3368 [JHK] [OAN-SPM-2.1m]

NGC 3432 [VRIHa Psuedo color] [VBO-2.3m]

Orion Trapizium [Hb Oiii Ha] [VBO-1m]