J/AJ/128/2080 HI emission observations (O'Neil+, 2004)
New reference galaxy standards for H I emission observations.
O'Neil K.
<Astron. J., 128, 2080-2097 (2004)>
=2004AJ....128.2080O 2004AJ....128.2080O
ADC_Keywords: Radio lines ; H I data
Keywords: galaxies: distances and redshifts - galaxies: fundamental parameters -
galaxies: spiral - radio lines: galaxies
Abstract:
We have taken advantage of the improved baselines and higher
sensitivity available with the upgraded Arecibo 305m telescope to
create a new HI spectral line catalog of disk galaxies that can be
used as a reference catalog for anyone interested in 21cm spectral
line work. In all, 108 galaxies were observed, covering 24hr of the
sky at declinations between 0° and 36° and velocities between
0 and 25,000km/s. The majority of the galaxies were observed at least
two times on different nights to avoid problems with radio frequency
interference, baseline fluctuations, etc. Comparing our measured
values with all those available in the literature shows that although
large individual variations may exist, the average difference between
the measurements is zero. In all we have considerable confidence in
our measurements, and the resulting catalog should be extremely useful
as a well-defined reference catalog for anyone interested in 21cm
spectral line work.
Description:
Data were taken with the L-narrow receiver between 2001 August and
2002 July. To check the Arecibo results, we reobserved the most
discrepant sources using the Robert C. Byrd Green Bank Telescope
(GBT). All GBT observations took place between 2004 April 19 and May
14.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 116 110 Final Results, Broken Down by Resolution
table2.dat 59 23 Results from Green Bank Telescope (GBT) Observations
table3.dat 64 188 Literature Values
refs.dat 75 38 References
--------------------------------------------------------------------------------
See also:
VIII/68 : Huchtmeier-Richter HI catalog
http://www.gb.nrao.edu/~koneil/HIsurvey/ : Data Summary
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Name Source galaxy name
15- 16 A2 --- f_Name Flag on Name (1)
18- 19 I2 h RAh ? Hour of right ascension (J2000)
21- 22 I2 min RAm ? Minute of right ascension (J2000)
24- 27 F4.1 s RAs ? Second of right ascension (J2000)
29- 30 I2 deg DEd ? Degree of declination (J2000)
32- 33 I2 arcmin DEm ? Arcminute of declination (J2000)
35- 38 F4.1 arcsec DEs ? Arcsecond of declination (J2000)
40- 44 I5 km/s HV Heliocentric velocity
46- 47 I2 km/s e_HV Uncertainty in HV
49- 52 F4.1 Jy.km/s F(0.65) ? Flux at 0.65km/s resolution
56 I1 Jy.km/s e_F(0.65) ? Uncertainty in F(0.65)
58- 60 I3 km/s W20(0.65) ? The 20% mean value velocity width
62- 63 I2 km/s e_W20(0.65) Uncertainty in W20(0.65)
65- 67 I3 km/s W50(0.65) ? The 50% mean value velocity width
69- 70 I2 km/s e_W50(0.65) ? Uncertainty in W50(0.65)
72- 75 F4.1 Jy.km/s F(1.3) Flux at 1.3km/s resolution
77- 79 F3.1 Jy.km/s e_F(1.3) Uncertainty in F(1.3)
81- 83 I3 km/s W20(1.3) The 20% mean value velocity width
85- 86 I2 km/s e_W20(1.3) Uncertainty in W20(1.3)
88- 90 I3 km/s W50(1.3) The 50% mean value velocity width
92- 93 I2 km/s e_W50(1.3) Uncertainty in W50(1.3)
95- 98 F4.1 Jy.km/s F(8.5) ? Flux at 8.5km/s resolution
100-102 F3.1 Jy.km/s e_F(8.5) ? Uncertainty in F(8.5)
104-106 I3 km/s W20(8.5) ? The 20% mean value velocity width
108-109 I2 km/s e_W20(8.5) Uncertainty in W20(8.5)
111-113 I3 km/s W50(8.5) ? The 50% mean value velocity width
115-116 I2 km/s e_W50(8.5) Uncertainty in W20(8.5)
--------------------------------------------------------------------------------
Note (1): Flag on Name, defined as follows:
d = This galaxy may have HI extending beyond the Arecibo beam,
resulting in the flux measurements reported here being too low.
No GBT follow-up results are available.
dd = This galaxy has HI extending beyond the Arecibo beam,
resulting in the flux measurements reported here being too low.
The results from the GBT observations (Table 2) are more reliable.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Name Galaxy Name
14 A1 --- f_Name [a] Flag on Name (1)
16- 19 I4 km/s HV Heliocentric velocity
22 I1 km/s e_HV Uncertainty in HV
26- 29 F4.1 Jy.km/s Flux GBT (Green Bank Telescope) flux at 1.4GHz
32- 34 F3.1 Jy.km/s e_Flux Uncertainty in Flux
38- 40 F3.1 Jy rms rms noise
43- 45 I3 km/s W20 Velocity width at 20% of the peak flux
48- 49 I2 km/s e_W20 Uncertainty in W20
53- 55 I3 km/s W50 Velocity width at 50% of the peak flux
58- 59 I2 km/s e_W50 Uncertainty in W50
--------------------------------------------------------------------------------
Note (1):
a = The heliocentric velocity found by the GBT for this galaxy is off by
17km/s because of an instrumental error.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Name Source galaxy name
15- 20 F6.3 Jy.km/s Flux Flux at 1.4GHz
22- 24 F3.1 Jy.km/s e_Flux Uncertainty in Flux
26 A1 --- f_Flux Flag on Flux (1)
28- 30 I3 km/s W20 ? The 20% mean value velocity width
32- 33 I2 km/s e_W20 ? Uncertainty in W20
35- 36 A2 --- f_W20 Flag on W20 (2)
38- 40 I3 km/s W50 ? The 50% mean value velocity width
42- 43 I2 km/s e_W50 ? Uncertainty in W50
45- 46 A2 --- f_W50 Flag on W50 (2)
48- 52 I5 km/s HV ? Heliocentric velocity
54- 55 I2 km/s e_HV ? Uncertainty in HV
57- 58 A2 --- f_HV Flag on HV (2)
60 A1 --- Tel Telescope (3)
62- 63 A2 --- r_Name Reference on Name
--------------------------------------------------------------------------------
Note (1): Flag on Flux, defined as follows:
d = Not given in the literature; estimated from assuming a 10% flux error.
Note (2): Flag on W20, W50 and VHel, defined as follows:
dd = Not given in the literature; estimated from half the channel resolution.
Note (3): Telescope designation use the following symbols:
A = Arecibo 305m telescope;
G = Green Bank 300foot telescope;
N = Nancay Decimetric Radio Telescope;
W = Westerbork Synthesis Radio Telescope;
J = Jodrell Bank 250foot telescope;
E = Effelsberg 100m telescope;
B = Green Bank 140foot telescope.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Ref Reference number
5- 23 A19 --- Bibcode Bibcode
28- 50 A23 --- Aut Author's name
55- 75 A21 --- Com Comments
--------------------------------------------------------------------------------
History:
* 14-Apr-2005: From electronic version of the journal
* 20-Jul-2005: NGC 257 = UGC 493:
- in table1: originally quoted NGC 247 (but is actually NGC 257)
- in table3: originally quoted UGC 453 (but is actually NGC 257)
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 14-Apr-2005