D. P. Smits
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View article: First Detection of Circular Polarization in 4.7 GHz Excited OH Masers
First Detection of Circular Polarization in 4.7 GHz Excited OH Masers Open
We report the first detection of circular polarization in 4.7 GHz excited OH masers in star-forming regions made using full Stokes measurements with the Green Bank 100 m telescope. The Zeeman shift between the two circular components provi…
View article: Point Source C-band Mueller Matrices for the Green Bank Telescope
Point Source C-band Mueller Matrices for the Green Bank Telescope Open
C -band Mueller matrices for the Green Bank Telescope are presented here which enable on-sky Stokes parameters for point sources at the beam center to be determined. Standard calibrators, 3C 138 and 3C 286, were observed using the Spider p…
View article: Point Source C-Band Mueller Matrices for the Green Bank Telescope
Point Source C-Band Mueller Matrices for the Green Bank Telescope Open
C-Band Mueller matrices for the Green Bank Telescope are presented here which enable on-sky Stokes parameters for point sources at the beam center to be determined. Standard calibrators, 3C138 and 3C286, were observed using the Spider prog…
View article: Overview of the Maser Monitoring Organisation
Overview of the Maser Monitoring Organisation Open
The Maser Monitoring Organisation is a collection of researchers exploring the use of time-variable maser emission in the investigation of astrophysical phenomena. The forward directed aspects of research primarily involve using maser emis…
View article: Recent updates on the Maser Monitoring Organisation
Recent updates on the Maser Monitoring Organisation Open
The Maser Monitoring Organisation (M2O) is a research community of telescope operators, astronomy researchers and maser theoreticians pursuing a joint goal of reaching a deeper understanding of maser emission and exploring its variety of u…
View article: An nl-model with radiative transfer for hydrogen recombination line masers
An nl-model with radiative transfer for hydrogen recombination line masers Open
Atomic hydrogen masers occur in recombination plasmas in sufficiently dense H ii regions. These hydrogen recombination line (HRL) masers have been observed in a handful of objects to date and the analysis of the atomic physics involved has…
View article: The influence of continuum radiation fields on hydrogen radio recombination lines
The influence of continuum radiation fields on hydrogen radio recombination lines Open
Calculations of hydrogen departure coefficients using a model with the\nangular momentum quantum levels resolved that includes the effects of external\nradiation fields are presented. The stimulating processes are important at\nradio frequ…
View article: A masing event in NGC 6334I: contemporaneous flaring of hydroxyl, methanol, and water masers
A masing event in NGC 6334I: contemporaneous flaring of hydroxyl, methanol, and water masers Open
As a product of the maser monitoring program with the 26m telescope of the\nHartebeesthoek Radio Astronomy Observatory (HartRAO), we present an\nunprecedented, contemporaneous flaring event of 10 maser transitions in\nhydroxyl, methanol, a…
View article: The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Emergence of Strong 6.7 GHz Methanol Masers
The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Emergence of Strong 6.7 GHz Methanol Masers Open
We report the first sub-arcsecond VLA imaging of 6 GHz continuum, methanol maser, and excited-state hydroxyl maser emission toward the massive protostellar cluster NGC 6334I following the recent 2015 outburst in (sub)millimeter continuum t…
View article: Model of Hydrogen Deficient Nebulae in H II Regions at High Temperature
Model of Hydrogen Deficient Nebulae in H II Regions at High Temperature Open
In current photoionization models, determination of the ionization structure of the nebulae is a crucial part of the calculations for non-uniform hydrogen density. We have been tried to compute temperature fluctuations of electron and elec…
View article: Temperature Fluctuations in Photoionized Nebulae in Case of Oxygen and Nitrogen Abundances
Temperature Fluctuations in Photoionized Nebulae in Case of Oxygen and Nitrogen Abundances Open
We present the dependence of electron temperature fluctuations of O++ and H+ by the chemical abundances of oxygen and nitrogen. Models assume that hydrogen density is uniform in one case and non uniform in the second case, which vary with …
View article: Photoionization Modelling of H II Region for Oxygen Ions
Photoionization Modelling of H II Region for Oxygen Ions Open
We present phoionization model calculations of ionization fraction of hydrogen, helium and oxy-gen at low density of photoionized nebulae using the photoionization code CLOUDY. The ionization parameter is between -2.0 ≤ log(U) ≤ 1.0, and w…