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19912026
Showing 2015 · astro-ph.GAShow all

8 papers · 2 filters

astro-ph.GA2015★ 11 cited

Magnetic Field Strengths in Photodissociation Regions

Dana S. Balser, D. Anish Roshi, S. Jeyakumar +3

We measure carbon radio recombination line (RRL) emission at 5.3 GHz toward four HII regions with the Green Bank Telescope (GBT) to determine the magnetic field strength in the pho…

astro-ph.GA2015★ 89 cited

Finding Distant Galactic HII Regions

L. D. Anderson, W. P. Armentrout, B. M. Johnstone +4

The WISE Catalog of Galactic HII Regions contains HII region candidates lacking ionized gas spectroscopic observations. All candidates have the characteristic HII region…

astro-ph.GA2015★ 21 cited

Untangling the Recombination Line Emission from HII Regions with Multiple Velocity Components

L. D. Anderson, L. A. Hough, T. V. Wenger +2

HII regions are the ionized spheres surrounding high-mass stars. They are ideal targets for tracing Galactic structure because they are predominantly found in spiral arms and have…

astro-ph.GA2015★ 63 cited

Bipolar HII regions - Morphology and star formation in their vicinity - I - G319.8800.79 and G010.3200.15

L. Deharveng, A. Zavagno, M. R. Samal +9

Our goal is to identify bipolar HII regions and to understand their morphology, their evolution, and the role they play in the formation of new generations of stars. We use the Spi…

astro-ph.GA2015

Azimuthal Metallicity Structure in the Milky Way Disk

Dana S. Balser, Trey V. Wenger, L. D. Anderson +1

Elemental abundance patterns in the Galactic disk constrain theories of the formation and evolution of the Milky Way. HII region abundances are the result of billions of years of c…

astro-ph.GA2015★ 66 cited

Tracing the Conversion of Gas into Stars in Young Massive Cluster Progenitors

D. L. Walker, S. N. Longmore, N. Bastian +5

Whilst young massive clusters (YMCs; 10 M, age 100 Myr) have been identified in significant numbers, their progenitor gas clouds have elude…

astro-ph.GA2015★ 118 cited

A cluster in the making: ALMA reveals the initial conditions for high-mass cluster formation

J. M. Rathborne, S. N. Longmore, J. M. Jackson +9

G0.253+0.016 is a molecular clump that appears to be on the verge of forming a high mass, Arches-like cluster. Here we present new ALMA observations of its small-scale (~0.07 pc) 3…

astro-ph.GA2015★ 21 cited

Interferometric Observations of High-Mass Star-Forming Clumps with Unusual N2H+/HCO+ Line Ratios

Ian W. Stephens, James M. Jackson, Patricio Sanhueza +4

The Millimetre Astronomy Legacy Team 90 GHz (MALT90) survey has detected high-mass star-forming clumps with anomalous NH/HCO(1-0) integrated intensity ratios that are e…