It looks like bulge-less galaxies have never merged

[sologuitarist61]

Below is an email I have just received from Galaxy Zoo that you might find of interest.

Dear Galaxy Zoo

It's been an exciting few weeks at Galaxy Zoo, with two particularly

cherished scientific results being accepted by the journals, thanks to

all the hard work you've provided via GalaxyZoo.org.

The first is a study of mysteriously bulgeless galaxies. These

spirals, which lack the normal 'bulge' of stars you see at the centre

of most such galaxies, including the Milky Way, are guaranteed (we

think!) never to have had a merger. They can uniquely tell us about

the effect dramatic mergers have on galaxies unfortunate enough to

endure them - the ones highlighted in this recent paper have

surprisingly large black holes, which must have grown in this unique

merger free environment.

Bulgeless galaxies are a new departure for us, but the other paper is

a study of some of our oldest finds. Bill Keel and team - including a

whole host of Galaxy Zoo users - are proud to publish the official

Galaxy Zoo catalogue of 1990 overlapping galaxy pairs. Before we

started, only 20 of these unique systems were known so this is a huge

advance. Congratulations to all, particularly the dedicated denizens

of the forums who tracked them all down.

If you haven't had enough galaxies, then we'd also like to invite you

to take a close look at the large system nearest to home.

Andromedaproject.org is the latest Zooniverse project, and it aims to

create a unique catalogue of star clusters in the Andromeda Galaxy.

There are also a few more distant galaxies lurking in these stunning

Hubble Space Telescope images, waiting to be discovered. Please do go

and try it out.

Thanks again for all your help

Chris & the Galaxy Zoo team.

[garethmob]

I just had this mail. Sounds very interesting and reminded me to do it again haven't done any for a while.

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