Stellar motions in outer halo shed new light on Milky Way evolution

Sideways stellar motions suggest shell-like structure in the Milky Way halo

This illustration shows the disk of our Milky Way galaxy surrounded by a faint, extended halo of old stars. Astronomers using the Hubble Space Telescope to observe the nearby Andromeda galaxy identified a dozen foreground stars in the Milky Way halo and measured their sideways motions. Illustration Credit: NASA, ESA, and A. Feild (STScI)

Peering deep into the vast stellar halo that envelops our Milky Way galaxy, astronomers using NASA's Hubble Space Telescope have uncovered tantalizing evidence for the possible existence of a shell of stars that are a relic of the Milky Way's past cannibalism of other galaxies.

A team of astronomers led by Alis Deason, a postdoctoral fellow at UC Santa Cruz, used Hubble observations to precisely measure, for the first time ever, the sideways motions of a small sample of stars located far from the galaxy's center. Their unusual lateral motion is circumstantial evidence that the stars may be the remnants of a shredded galaxy that was gravitationally ripped apart by the Milky Way billions of years ago. These stars support the idea that the Milky Way grew through the accretion of smaller galaxies.

"Hubble's unique capabilities are allowing astronomers to uncover clues to the galaxy's remote past," said coauthor Roeland van der Marel of the Space Telescope Science Institute (STScI) in Baltimore. "The more distant regions of the galaxy have evolved more slowly than the inner sections. Objects in the outer regions still bear the signatures of events that happened long ago."

They also offer a new opportunity for measuring the "hidden" mass of our galaxy, which is in the form of dark matter (an invisible form of matter that does not emit or reflect radiation). "Our ability now to measure the motions of these stars opens up a whole new territory we haven't explored yet," Deason said.


"We knew these stars were there, because for the Andromeda study we had to separate the stars in Andromeda from the stars in the Milky Way," said coauthor Puragra Guhathakurta, professor of astronomy and astrophysics at UC Santa Cruz. Guhathakurta and van der Marel were both involved in the Andromeda study, which required repeated observations over a five- to seven-year period to detect the motions of the stars.

The new study has been accepted for publication in the Astrophysical Journal. Led by Deason and van der Marel, the team identified 13 stars located roughly 80,000 light-years from the Milky Way's center. They lie in the galaxy's outer halo of ancient stars that date back to the formation of our galaxy.


The astronomers identified the stars based on their colors, brightness, and sideways motions. The halo stars appear to move faster than the Andromeda stars because they are so much closer. Team member Sangmo Tony Sohn of the STScI identified the halo stars and measured both the amount and direction of their slight sideways motion. The stars move on the sky only about one milliarcsecond a year, which would be like watching a golf ball on the Moon moving one foot per month. Nonetheless, this was measured with 5 percent precision, made possible in visible-light observations because of Hubble's razor-sharp view and instrument consistency. "The precision that Hubble achieves is remarkable," Guhathakurta said.

The team was surprised to find that the stars in the outer halo showed more sideways, or tangential, motion than they expected. Stars in the inner halo have highly radial orbits, plunging toward the galactic center and traveling back out again. When the team compared the tangential motion of the outer halo stars with their radial motion, they were very surprised to find that the two were equal. Computer simulations of galaxy formation normally show an increasing tendency towards radial motion if one moves further out in the halo. These observations imply the opposite trend.

The existence of a shell structure in the Milky Way halo is one plausible explanation of the researchers' findings. Such a shell can form by accretion of a satellite galaxy. This is consistent with a picture in which the Milky Way has undergone continuing evolution over its lifetime due to the accretion of satellite galaxies.

The team compared their results with data of halo stars recorded in the Sloan Digital Sky Survey. Those observations uncovered a higher density of stars at about the same distance as the 13 outer halo stars in their Hubble study. Beyond that radius, the number of stars plummets.



Encouraged by this study, the team hopes to search for more outer halo stars in the Hubble archive. "These unexpected results fuel our interest in looking for more stars to confirm that this is really happening," Deason said. "At the moment we have quite a small sample. So we really can make it a lot more robust by getting more fields with Hubble."


The science team consists of Deason and Guhathakurta at UC Santa Cruz and van der Marel, Sohn, and T.M. Brown of the Space Telescope Science Institute.