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J/ApJ/831/124        Milky Way kinematics. II.        (McClure-Griffiths+, 2016)

Milky Way kinematics. II. A uniform inner galaxy H I terminal velocity curve. McClure-Griffiths N.M., Dickey J.M. <Astrophys. J., 831, 124-124 (2016)> =2016ApJ...831..124M (SIMBAD/NED BibCode)
ADC_Keywords: Galactic plane ; H I data ; Surveys Keywords: Galaxy: kinematics and dynamics; ISM: kinematics and dynamics; radio lines: ISM Abstract: Using atomic hydrogen (HI) data from the VLA Galactic Plane Survey, we measure the HI terminal velocity as a function of longitude for the first quadrant of the Milky Way. We use these data, together with our previous work on the fourth Galactic quadrant, to produce a densely sampled, uniformly measured, rotation curve of the northern and southern Milky Way between 3kpc<R<8kpc. We determine a new joint rotation curve fit for the first and fourth quadrants, which is consistent with the fit we published in McClure-Griffiths & Dickey (Paper I, 2007ApJ...671..427M) and can be used for estimating kinematic distances interior to the solar circle. Structure in the rotation curves is now exquisitely well defined, showing significant velocity structure on lengths of ∼200pc, which is much greater than the spatial resolution of the rotation curve. Furthermore, the shape of the rotation curves for the first and fourth quadrants, even after subtraction of a circular rotation fit shows a surprising degree of correlation with a roughly sinusoidal pattern between 4.2<R<7kpc. Description: The HI data used here are from the VLA Galactic Plane Survey (VGPS; Stil+ 2006AJ....132.1158S). The VGPS is a survey of a 21cm continuum and HI emission and absorption obtained with the Very Large Array in its D-array configuration and combined with single dish data from the NRAO Green Bank Telescope. The HI spectral line data have an angular resolution of 1' with rms noise of 2K of brightness temperature, Tb, in each 0.83km/s velocity channel. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 20 748 Inner Galaxy HI terminal velocity curve
See also: VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005) J/ApJ/816/42 : Mass models for the Milky Way (McGaugh, 2016) J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014) J/ApJS/140/331 : High-velocity HI observations at 21cm (Lockman+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 F6.3 deg GLON [18.4/67] Galactic longitude in decimal degrees 8- 13 F6.2 km/s vLSR [18.7/134.2] Measured HI terminal velocities 15- 20 F6.2 km/s vMOD [27.7/138] Predicted HI terminal velocities (1)
Note (1): Predicted HI terminal velocities from the linear rotation curve fit, Σ(R)/Σ0=0.171(R/R0)+0.889; see also Figure 5.
History: From electronic version of the journal References: McClure-Griffiths et al. Paper I. 2007ApJ...671..427M
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Feb-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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