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PGC 2429 (M110)
Margaret Robinson

PGC 2429

PGC2429 is an Elliptical Galaxy and is considered part of the Andromeda Galaxy. This galaxy has turned up in many different reference guides and has many names; M110 and NGC205, to name a few. A satellite of the Andromeda Galaxy, PGC2429 is often seen as a small ball of light underneath or just outside of the larger spiral galaxy. This picture was taken when PGC2429 was to the northwest of Andromeda. Though considered a Dwarf, PGC2429 has eight globular clusters forming a halo around it. A globular cluster is a multitude of stars gravitationally bound together. These clusters allow for PGC2429 to be seen from an amateur telescope. Usually, Elliptical Galaxies are known for their bright red stars. However, this galaxy is made up of blue, ultra-violet light. This means that the stars of PGC2429 are burning at a very high temperature, hotter than most Elliptical Galaxies.

The picture above shows these intensely burning blue stars, which appear white at this distance. The misty halo around PGC2429 is the series of eight globular clusters within an arc minute of the dense center, allowing our telescope to pick up the light from Earth. There is a thin dust cloud in front of PGC2429, visible at the left top and bottom a few arc minutes away from the ring of light emited by the globular clusters, and is characterised by the dark smudges of absent light in the elliptical dome of outer light. The globular clusters and dense core emit this large ellipse shaped dome of light that reaches to the edges of the picture. At the edges of this light, there are multiple blue and yellow lights, stars around the same ages as would be found in PGC2429. We can also see that PGC2429 has a dense, bright core, unlike the larger Andromeda Galaxy, whose core is a super massive black hole. This means that the Elliptical Galaxy has a central star or stars. The distance to PGC2429 is 2900 kly (kilolight-years); we find the maximum angular size to be 17 arc minutes, which corresponds to a linear size of 0.24 kly.


References:

Frommert, Hartmut and Kronberg, Christine. "Messier 110" Students for the Exploration and Development of Space. http://messier.seds.org/m/m110.html

Microsoft Research, “M110” World Wide Telescope. http://www.worldwidetelescope.org/search/ObjectDetails.aspx?id=110

Nemiroff, Robert and Bonnell, Jon. “M32: Blue Stars in an Elliptical Galaxy.” http://apod.nasa.gov/apod/ap991103.html

Right Ascension (J2000) 00:40:22
Declination (J2000) 41:00:00
Filters used B (Blue), C (Clear), R (Red), V (Green)
Exposure time per filter B, V, R, C (60s x 5)
Date observed November 10, 2011

 

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