Mapping spiral structure on the far side of the Milky Way

@article{Sanna2017MappingSS,
  title={Mapping spiral structure on the far side of the Milky Way},
  author={Alberto Sanna and Mark J. Reid and Thomas M. Dame and Karl M. Menten and Andreas Brunthaler},
  journal={Science},
  year={2017},
  volume={358},
  pages={227 - 230}
}
Measuring the far side of the Galaxy Direct measurements of distances to astronomical sources rely on parallax, which can usually only be measured for relatively nearby objects. The far side of the Milky Way has been impossible to measure accurately, because the parallax is very small and interstellar dust blocks optical light from those regions. Sanna et al. used radio interferometry to directly determine the parallax distance to a star-forming region on the far side of the Galaxy. They also… 

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References

SHOWING 1-10 OF 33 REFERENCES

A Parallax-based Distance Estimator for Spiral Arm Sources

The spiral arms of the Milky Way are being accurately located for the first time via trigonometric parallaxes of massive star-forming regions with the Bar and Spiral Structure Legacy Survey, using

TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY

Over 100 trigonometric parallaxes and proper motions for masers associated with young, high-mass stars have been measured with the Bar and Spiral Structure Legacy Survey, a Very Long Baseline Array

TRIGONOMETRIC PARALLAXES TO STAR-FORMING REGIONS WITHIN 4 kpc OF THE GALACTIC CENTER

We report four trigonometric parallaxes for high-mass star-forming regions within 4 kpc of the Galactic center. These measurements were made with the Very Long Baseline Array as part of the BeSSeL

The far distance to G7.47+0.06 from proper motion measurement of H2O masers

We report on a distance measurement of 22 GHz H 2 O maser features associated with an ultra-compact H II region G7.47 + 0.06 using VERA (VLBI Exploration of Radio Astrom-etry). Since the source is

The Milky Way in Molecular Clouds: A New Complete CO Survey

New large-scale CO surveys of the first and second Galactic quadrants and the nearby molecular cloud complexes in Orion and Taurus, obtained with the CfA 1.2 m telescope, have been combined with 31

A MOLECULAR SPIRAL ARM IN THE FAR OUTER GALAXY

We have identified a spiral arm lying beyond the Outer Arm in the first Galactic quadrant ∼15 kpc from the Galactic center. After tracing the arm in existing 21 cm surveys, we searched for molecular

H II REGION METALLICITY DISTRIBUTION IN THE MILKY WAY DISK

The distribution of metals in the Galaxy provides important information about galaxy formation and evolution. H ii regions are the most luminous objects in the Milky Way at mid-infrared to radio

Microarcsecond Radio Astrometry

Astrometry provides the foundation for astrophysics. Accurate positions are required for the association of sources detected at different times or wavelengths, and distances are essential to estimate

Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm

We report measurements of parallaxes and proper motions of ten high-mass star-forming regions in the Sagittarius spiral arm of the Milky Way as part of the BeSSeL Survey with the VLBA. Combining

CLUSTERED STAR FORMATION AND OUTFLOWS IN AFGL 2591

We report on a detailed study of the water maser kinematics and radio continuum emission toward the most massive and young object in the star-forming region AFGL 2591. Our analysis shows at least two