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GMIMS: The Global Magneto-Ionic Medium Survey
M. Wolleben, T. L. Landecker, E. Carretti +10
The Global Magneto-Ionic Medium Survey (GMIMS) is a project to map the diffuse polarized emission over the entire sky, Northern and Southern hemispheres, from 300 MHz to 1.8 GHz. W…
Milky Way Kinematics: Measurements at the Subcentral Point of the Fourth Quadrant
N. M. McClure-Griffiths, John M. Dickey
We use atomic hydrogen (HI) data from the Southern Galactic Plane Survey to study the kinematics of the fourth quadrant of the Milky Way. By measuring the terminal velocity as a fu…
Rotation Measures of Extragalactic Sources Behind the Southern Galactic Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky Way
J. C. Brown, M. Haverkorn, B. M. Gaensler +5
We present new Faraday rotation measures (RMs) for 148 extragalactic radio sources behind the southern Galactic plane (253o < l < 356o, |b| < 1.5o), and use these data in combinati…
Cold HI in Turbulent Eddies and Galactic Spiral Shocks
Steven J. Gibson, A. Russell Taylor, Jeroen M. Stil +3
HI 21cm-line self-absorption (HISA) reveals the shape and distribution of cold atomic clouds in the Galactic disk. Many of these clouds lack corresponding CO emission, despite bein…
The Southern Galactic Plane Survey: Polarized Radio Continuum Observations and Analysis
M. Haverkorn, B. M. Gaensler, N. M. McClure-Griffiths +2
The Southern Galactic Plane Survey (SGPS) is a radio survey in the 21 cm H I line and in 1.4 GHz full-polarization continuum, observed with the Australia Telescope Compact Array an…
Magnetically Dominated Strands of Cold Hydrogen in the Riegel-Crutcher Cloud
N. M. McClure-Griffiths, J. M. Dickey, B. M. Gaensler +2
We present new high resolution (100 arcsec) neutral hydrogen (H I) self-absorption images of the Riegel-Crutcher cloud obtained with the Australia Telescope Compact Array and the P…
Enhanced small-scale Faraday rotation in the Galactic spiral arms
M. Haverkorn, B. M. Gaensler, J. C. Brown +4
We present an analysis of the rotation measures (RMs) of polarized extragalactic point sources in the Southern Galactic Plane Survey. This work demonstrates that the statistics of…
Magnetic fields in the Southern Galactic Plane Survey
Marijke Haverkorn, Bryan M. Gaensler, Jo-Anne C. Brown +3
The Southern Galactic Plane Survey (SGPS) is a 1.4 GHz radio polarization and HI survey in a large part of the inner Galactic plane at a resolution of about an arcmin. Depolarizati…
The Magnetic Field of the Large Magellanic Cloud: A New Way of Studying Galactic Magnetism
Bryan M. Gaensler, M. Haverkorn, L. Staveley-Smith +4
We present a study of the Faraday rotation of extragalactic sources lying behind the Large Magellanic Cloud. These data represent the most detailed study yet of magnetic field stru…
Discovery of a New Low-Latitude Milky Way Globular Cluster using GLIMPSE
Chip Kobulnicky, A. J. Monson, B. A Buckalew +28
Spitzer Space Telescope imaging as part of the Galactic Legacy Mid-Plane Survey Extraordinaire (GLIMPSE) reveals a previously unidentified low-latitude rich star cluster near l=31.…
The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
R. Indebetouw, J. S. Mathis, B. L. Babler +17
We determine and tabulate A(lambda)/A(K), the wavelength dependence of interstellar extinction, in the Galactic plane for 1.25um<lambda<8.0um along two lines of sight: l~42 and l~2…
A Distant Extended Spiral Arm in the Fourth Quadrant of the Milky Way
N. M. McClure-Griffiths, J. M. Dickey, B. M. Gaensler +1
Using data from the Southern Galactic Plane Survey we present a possible distant spiral arm in the fourth quadrant of the Milky Way. The very distinct and cohesive feature can be t…
Magnetic Fields and Ionized Gas in the inner Galaxy: An Outer Scale for Turbulence and the Possible Role of HII Regions
M. Haverkorn, B. M. Gaensler, N. M. McClure-Griffiths +2
We present an analysis of rotation measure (RM) fluctuations from the Test Region of the Southern Galactic Plane Survey (SGPS), along with emission measure (EM) fluctuations in the…
A Neutral Hydrogen Self-Absorption Cloud in the SGPS
D. W. Kavars, J. M. Dickey, N. M. McClure-Griffiths +2
Using data from the Southern Galactic Plane Survey (SGPS) we analyze an HI self-absorption cloud centered on l = 318.0 deg, b = -0.5 deg, and velocity, v = -1.1 km/s. The cloud was…
PSR B1849+00 probes the tiny-scale molecular gas?
S. Stanimirovic, J. M. Weisberg, J. M. Dickey +4
In this paper we present and discuss the great difference in OH absorption spectra against PSR B1849+00 and SNR G33.6+0.1 along the same line-of-sight. This finding is important as…
Detection of OH absorption against PSR B1849+00
Snezana Stanimirovic, Joel M. Weisberg, John M. Dickey +4
We have searched for OH absorption against seven pulsars using the Arecibo telescope. In both OH mainlines (at 1665 and 1667 MHz), deep and narrow absorption features were detected…
Fitting Together the HI Absorption and Emission in the SGPS
John M. Dickey, N. M. McClure-Griffiths, B. M. Gaensler +1
In this paper we study 21-cm absorption spectra and the corresponding emission spectra toward bright continuum sources in the test region (326deg< l < 333 deg) of the Southern Gala…
The small-scale structure of the Magellanic Stream
S. Stanimirovic, J. M. Dickey, M. Krco +1
We have mapped two regions at the northern tip of the Magellanic Stream in neutral hydrogen 21-cm emission using the Arecibo telescope. The new data are used to study the morpholog…
The small-scale structure of the Magellanic Stream
Snezana Stanimirovic, John M. Dickey, Alyson M. Brooks
We have mapped in neutral hydrogen (HI) two regions at the northern tip of the Magellanic Stream, known as MS V and MS VI, using the Arecibo telescope. The small-scale structure of…
HI Shells Behind the Coalsack
N. M. McClure-Griffiths, John M. Dickey, B. M. Gaensler +1
We report the discovery of two new large HI shells in the direction of the Coalsack nebula. Both shells were observed with the Parkes Radio Telescope as part of the Southern Galact…
Southern Galactic Plane Survey Measurements of the Spatial Power Spectrum of Interstellar H I in the Inner Galaxy
John M. Dickey, N. M. McClure-Griffiths, Snezana Stanimirovic +2
Using data from the Southern Galactic Plane Survey we have measured the spatial power spectrum of the interstellar neutral atomic hydrogen in the fourth Galactic quadrant. This fun…
Spectroscopy with Single Dish Radio Telescopes
John M. Dickey
This chapter is in three parts. The first presents the fundamental equations of level populations and radiative transfer which govern spectral line emission and absorption. Lines i…
HI Emission and Absorption in the Southern Galactic Plane Survey
N. M. McClure-Griffiths, John M. Dickey, B. M. Gaensler +3
We present preliminary results from the Southern Galactic Plane Survey (SGPS) Test Region and Parkes data. As part of the pilot project for the Southern Galactic Plane Survey, obse…
The Southern Galactic Plane Survey: The Test Region
N. M. McClure-Griffiths, A. J. Green, John M. Dickey +3
The Southern Galactic Plane Survey (SGPS) is a project to image the HI line emission and 1.4 GHz continuum in the fourth quadrant of the Milky Way at high resolution using the Aust…