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Elliptical Galaxy (M 105)
Ryan DeMeester

M 105

The galaxy M105 was first discovered by Pierre Mechain in March of 1781. This galaxy is known to have a supermassive black hole that is around 200 million times the mass of our sun. The galaxy also contains stellar clusters and a few young stars. M105 is an elliptical galaxy which generally are made up of older low mass stars and have minimal star formation. Elliptical galaxies make up between 10 and 15 percent of the galaxies in the Virgo Supercluster. M105 is a unique elliptical galaxy because it does contain what appear to be young stars.

The image above shows three galaxies, two of which are elliptical galaxies and one that is a spiral galaxy. The object studied, M105, is at the center of the photo. Elliptical galaxy NGC 3384 is in the upper left of the photo and the spiral galaxy NGC 3389 is in the lower left corner. M105 is surrounded by a ring of hydrogen gas that covers a diameter of 400 kiloparsecs (1.3 million light years). The majority of the stars in M105 are old low mass stars and are represented by the yellow and orange color of the object.

The above image was formed by using features in the program MaxIm DL. The final image was formed by using images that were taken in the clear, red, green, and blue filters. The images were taken at the exposure lengths shown in the table below. They were combined and adjusted to most accurately represent the elliptical galaxy. This was done by using nearby stars that were in the photo. Since elliptical galaxies are cooler, it is expected that their colors should be yellow-orange. Thus the colors were adjusted until the galaxies' colors most accurately represented their temperature. Another method used was using the spiral galaxy in the lower left of the photo. The arms and disks of the spiral galaxy should be blue in color and the central area should be yellow. The image was adjusted using the blue filter to allow the appropriate color of the spiral galaxy to be created.

M 105

M105 is estimated to be 37.9 million light years away (10.537 Mpc) and has an angular size of 1691.72 arcseconds. The object was calculated to have a physical size around 311,000 light years. A de Vaucouleurs model was used to analyze the brightness decrease with distance away from the center of M105. The figure above shows the relation between the brightness and distance along with an equation describing the relation.

References:

"Messier 105." Astro Pixels, n.d. Web. 20 Apr. 2015. < http://astropixels.com/galaxies/M105-01.html>."Messier 105." <http://astropixels.com/galaxies/M105-01.html>.

"Messier 105." Wikipedia. Wikimedia Foundation, n.d. Web. 20 Apr. 2015. ."Messier 105." <http://en.wikipedia.org/wiki/Messier_105>

Messier Object 105. N.p., n.d. Web. 20 Apr. 2015. . "http://messier.seds.org/m/m105.html".

Right Ascension (J2000) 10:47:49
Declination (J2000) +12:34:52
Filters used C (Clear), R (Red), V (Green), B (Blue)
Exposure time per filter C, R, and V (300s x 5); B (300s x 15)
Image dimension 1092x736 pixels; 23.8x16.1 arcminutes
Date/time observed March 20, 2015, 11:32 UTC

 

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