J/A+A/563/A39 Cometary HII regions of DR21 (Immer+, 2014)
The cometary HII regions of DR21: Bow shocks or champagne flow or both?
Immer K., Cyganowski C., Reid M.J., Menten K.M.
<Astron. Astrophys. 563, A39 (2014)>
=2014A&A...563A..39I 2014A&A...563A..39I
ADC_Keywords: H II regions ; Radio lines
Keywords: HII regions - stars: formation - ISM: individual (DR21) -
ISM: kinematics and dynamics - radio lines: ISM
Abstract:
We present deep Very Large Array H66α radio recombination line
(RRL) observations of the two cometary HII regions in DR 21. With
these sensitive data, we test the "hybrid" bow shock/champagne flow
model previously proposed for the DR 21 HII regions.
Description:
The radio recombination line (RRL) H66alpha was observed at 22.364GHz
towards the cometary HII regions in DR21 with the Very Large Array in
D configuration. The bandwidth of the observations was 12.5MHz,
divided into 32 channels, resulting in a velocity resolution of
5.2km/s/channel. The full width at half maximum size of the
synthesized beam is 3.4". The rms of the line image cube is
0.7mJy/beam per channel.
Objects:
---------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------
20 39 01.6 +42 19 38 DR21 = GRS G081.70 +00.50
---------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 96 1 List of FITS file
dr21cube.fit 2880 8898 DR21 Radio Recombination Line H66α data cube
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 F3.1 arcsec/pix Scale [0.4] Scale of the image
24- 26 I3 pix Nx [512] Number of pixels along X-axis
27 A1 --- --- [x]
28- 30 I3 pix Ny [512] Number of pixels along Y-axis
31 A1 --- --- [x]
32- 33 I2 --- Nz [23] Number of channels
35- 43 F9.6 GHz Freq0 Lower value of frequency interval
47- 55 F9.6 GHz Freq1 upper value of frequency interval
59- 64 F6.4 MHz dFreq Frequency resolution
66- 77 A12 --- FileName Name of FITS file
79- 96 A18 --- Title Title and comments
--------------------------------------------------------------------------------
Acknowledgements:
Katharina Immer, kimmer(at)mpifr-bonn.mpg.de
History:
* 05-Mar-2014: on-line data
* 02-Jun-2015: correct fits file (from author)
(End) Patricia Vannier [CDS] 05-Feb-2014