Highly bipolar-collimated outflow Ou4 nebula. Shown here is the whole
mosaic as obtained using the Isaac Newton Telescope, where red is
Hα+[NII], green is [OIII], and blue is the Sloan g broadband
filter. Note that the outflow, also nicknamed "the Giant Squid", has an
extension of 2.5 full moons on the sky.
Credits: Romano Corradi (IAC), Nicolas Grosso, Agnès Acker, Robert
Greimel, Patrick Guillout. Image processing by Gabriel Pérez (IAC).
[ JPEG | TIFF ]
Ou4 is a recently discovered bipolar outflow with a projected size of
more than one degree in the plane of the sky. It is apparently centred
on a young stellar cluster — whose most massive representative is the
triple system HR 8119 — inside the HII region Sh 2-129. The apparent
position of Ou4 and the properties deduced in this study are consistent
with the hypothesis that Ou4 is located inside the Sh 2-129 HII region,
suggesting that it was launched some 90,000 yrs ago by HR 8119.
More information:
- NASA's Astronomy Picture of the Day, 17th July 2014.
- A. Acker et al., 2012, "Discovery of New Faint Northern Galactic Planetary Nebulae", RMXAA, 48, 223. Paper
- R. L. M. Corradi et al., 2014, "Gas physical conditions and kinematics of the giant outflow Ou4", hal-01022286. Paper
Contact:
Javier Méndez
(Public Relations Officer)
Source: Isaac Newton Group of Telescopes
