The Cigar Galaxy Is Smoking! Ha! Get It? I’ll Be In The Corner.

Check out  M82, otherwise known as the Cigar Galaxy, otherwise known as the source of my first really, really, really awful awful puns of the year.

Bad Astronomy:

One reason this new image from Hubble looks funny to me is that there aren’t as many stars in it as I expect. M82, also called the Cigar Galaxy due to its elongated shape, is pretty close as galaxies go, about 12 million light years away. It’s one of the closest large galaxies in the Universe, and a Hubble image usually shows it littered with stars, so closely packed they form a bluish background glow in most pictures.

And while that background of stars is there, it’s more diminished than usual because in this image astronomers used a series of filters that accentuate the light emitted by gas. While stars put out this kind of light as well, these filters downplay starlight and crank up the volume on, um, gaslight. Specifically, blue and green are from oxygen, red is from sulfur, and teal is hydrogen. The dark material is dust: long-chain molecules that absorb starlight. They also tend to redden light coming from behind them, similar to the way haze in the air makes sunsets look red.

Clearly, M82 is lousy with gas and dust in its core. That’s because it’s a starburst galaxy – it’s currently undergoing a fairly violent reproductive spree, cranking out new stars at a prodigious rate. This is probably due to a recent (well, if you can think of a few millions years ago as “recent”, which astronomers do) collision with its neighbor M81, a gorgeous full-on spiral galaxy. The gravitational interaction sent gas clouds slamming into each other inside M82, collapsing them and forming stars.

A lot of these new stars are hot and massive (and blue, right?), blasting out tremendous winds of particles, like a solar wind on cosmic steroids. These combined superwinds are stirring up and blowing out the gas and dust in the galaxy, creating the amazing swirls and tendrils you see here. Young stars also make lots of dust (both when they form and when they die, exploding as supernovae), which is why there is so much of the junk floating in the center of the galaxy.

It’s like Pink Floyd Said, Have A Cigar (Galaxy)! Yeah man, I’m on an (awful) roll.