HH 46/47

Jets of partially ionized gas emerging from a young star produce visible shocks upon impact with the ambient medium.

It also contains a mostly unipolar molecular outflow, and two large bow shocks on opposite sides of the source star.

In this model stellar winds from T Tauri stars would collide with the surrounding medium and generate shocks leading to emission.

[5][8] An image of a Question Mark associated with the object was reported on 18 August 2023 in The New York Times.

[9] During early stages of formation, stars launch bipolar outflows of partially ionized material along the rotation axis.

[10] The source of HH 46/47 is a binary class I protostar located inside a dark cloud of gas and dust, undetectable at visual wavelengths.

[b] Upon impacting the surrounding medium, the jet drives shocks in it, which lead to emission in the visible spectrum.

The counterjet is invisible as it is moving away from Earth into the dark cloud that hosts the star inside it.

[c] The bent and twisted appearance of the outflow is caused by variations in the ejection direction, i.e., precession of the source star.

[10][14] The whole structure is projected at approximately 30° with respect to the sky plane; this makes its actual length around 3 parsecs.

The presence of ices implies that the dusty shroud of the star is cool as opposed to the jet and shock regions where temperatures reach thousands of degrees.

Hubble Space Telescope video shows material is moving away from the source. Changes in brightness over the period of 14 years can be noted.
Star (center), approaching lobe (top right) and receding lobe (lower left) are clearly visible in this infrared image by James Webb Space Telescope . Absence of molecular outflow in approaching lobe is evident. This structure is 0.57 parsec across.
Plot of light intensity vs wavelength has several dips in it, caused by absorption of light emitted from the star by the molecules in surrounding medium
Infrared spectrum of the gaseous envelope of HH 46/47, obtained by NASA Spitzer Space Telescope . The medium in immediate vicinity of the star is silicate-rich.
Herbig-Haro objects are some of the rarer sights in the night sky, taking the form of thin spindly jets of matter floating amongst the surrounding gas and stars.