NGC 4569, Joshua Blocker
The name of this
spiral galaxy is M90 found by Charles Messier in March of 1781 in the
Virgo Cluster. It is
about 60million light years away. This galaxy is
moving toward us at 383km/sec so it actually has a blueshift
different from other galaxies in the sky which typically have a redshift
(moving away from us) due to
the expansion of the universe. This is probably
because of the movement in the Virgo Cluster with M90
moving toward us
and that velocity is overcoming the expansion of the Universes velocity,
so over time it will
end not be moving toward us anymore when it is 180
degrees around the center of the Virgo Cluster.
M90 has an inclination
angle of 62 degrees, so we are not looking straight on to it. I was able
to calculate this
by finding the effective radius for the major and minor
axis of the galaxy then taking the inverse cosine of the
minor axis radius
over the major axis radius. M90 has pretty tight spiral arms. There is
another galaxy in near
the top of the picture, this is the irregular galaxy
IC 3583. It is different than M90 because of the shape of the galaxy.
M90 has spirals arms, while IC 3583 does not have a typical galactic shape.
Carbon Monoxide emission is emitted at 2.6mm, so it is a type of radio
wave. It is formed by the cold gas interacting causing an emission line.
This image is 2.5 x 2.5 arcmins and showing just the core of the galaxy.
Carbon Monoxide photos are the nearest starburst galaxies.
This image is 1.0 x 1.0 arcmins and is oriented 90degrees CCW. This is
a picture showing the HII regions in
the galaxy via an H-alpha picture.
It is emitting photon of wavelength 6562.8 Angstroms(red). HII regions
are clouds of hot, ionized hydrogen in the interstellar medium which is
ionized by the formation of stars causing
an H-alpha emission line.
This is the Light Profile for M90 with a linearized fit. A light profile
is the brightness that is through the axis of
the galaxy. A profile for
both the major axis and the minor axis was created. This also gives a
And from the effective radius, you can get the scale
length. This has a major axis scale length of 4.4 kpc with
+ or - .1kpc.
Banfi, M.; Rampazzo, R.; Chincarini, G.; Henry, R. B. C. H II regions in spiral galaxies: Positions, luminosity
function and diameter
distribution 1993, Astronomy and Astrophysics, 280, 373
Koda, Jin; Nakanishi, Hiroyuki; Onodera, Sachiko; Kohno, Kotaro;
Tomita, Akihiko; Okumura, Sachiko K. The
Virgo High-Resolution CO Survey: I. CO Atlas 2003, Publications of
Astronomical Society of Japan, 55, 17
Students for the
Exploration and Development of Space, M90
Guided Discoveries M90
has made use of the NASA/IPAC
Extragalactic Database (NED) which is operated by the Jet Propulsion
Laboratory, California Institute of Technology, under contract with the
National Aeronautics and
is in the Virgo Cluster. North is up and East is to the left.
||The image is 10 by 10 arcminutes
|Dates of observation
2005 April 1&4
were dark subtracted and flat-fielded to remove noise. The images
from each filter were then combined to produce a high sensitivity
image in each filter. All 4 images were combined to produce a color
image, and a non-linear (gamma) transform was applied to bring out
faint detail in the filaments without saturating the bright, middle