Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/653/1226    Physical properties of galactic HII regions  (Quireza+, 2006)

The electron temperature gradient in the Galactic disk. Quireza C., Rood R.T., Bania T.M., Balser D.S., Maciel W.J. <Astrophys. J., 653, 1226-1240 (2006)> =2006ApJ...653.1226Q
ADC_Keywords: H II regions ; Abundances Keywords: H II regions - ISM: abundances - ISM: clouds - ISM: evolution - ISM: lines and bands - ISM: structure - nuclear reactions, nucleosynthesis, abundances - radio lines: ISM Abstract: We derive the electron temperature gradient in the Galactic disk, using a sample of HII regions that spans Galactocentric distances of 0-17kpc. The electron temperature was calculated using high-precision radio recombination line and continuum observations for more than 100 HII regions. Nebular Galactocentric distances were calculated in a consistent manner, using the radial velocities measured by our radio recombination line survey. The large number of nebulae widely distributed over the Galactic disk, together with the uniformity of our data, provide a secure estimate of the present electron temperature gradient in the Milky Way. Description: Our HII region sample data are described by Quireza et al. (2006, Cat. J/ApJS/165/338 and references therein). All observations were made near 8.6GHz (3.5cm) with the National Radio Astronomy Observatory (NRAO)6 140ft (43m) telescope in Green Bank, WV, which has a half-power beam width (HPBW) of 3.20' at this frequency. Our sample has 106 sources: 47 nebulae from the 3He survey and 66 from the CII survey. (There are seven objects in common.) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 106 119 Physical properties of Galactic HII regions
See also: J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Source Source designation (GLLL.ll+BBB.bb) 14- 16 A3 --- n_Source [d,e ] Observational notes (1) 18- 30 A13 --- Name Other name 32- 35 F4.1 kpc RGal Galactocentric distance 37- 40 F4.1 kpc dSun ?=- Heliocentric distance 42- 45 F4.1 arcmin theta ?=- Angular diameter 47- 50 F4.1 pc Diam ?=- Linear diameter 52- 56 F5.3 --- He+/H+ Ionic abundance ratio N(He+)/N(H+) 58- 62 F5.3 --- e_He+/H+ rms uncertainty on He+/H+ 64- 68 F5.1 Jy Snu ?=- Flux density at 8.6GHz 70- 74 F5.1 K TBC ?=- Continuum brightness Temperature 76- 81 F6.1 cm-3 ne ?=- Electron density 83- 87 I5 K Te ?=- Electron temperature (2) 89- 93 I5 K e_Te ?=- rms uncertainty on Te 95- 96 A2 --- Mode Continuum observing mode (3) 98 A1 --- Qc [A-E] Continuum quality factors (4) 100 A1 --- Ql [A-E] Line quality factors (4) 102-106 A5 --- Survey Survey (CII or 3He)
Note (1): Notes as follows: d = M16, M17, NGC 6334, Rosette, and S209 were observed at different positions in the 3He survey e = Observed in both CII and 3He surveys Note (2): The electron temperatures were rounded off to the nearest 10K. Note (3): Mode refers to the continuum observing mode as follows: TP = total power observations SP = denotes switched power observations Note (4): Quality flag: A best to E worst
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Aug-2008
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

catalogue service

© UDS/CNRS

Contact