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J/ApJ/615/702          IC 133 water vapor maser                   (Argon+, 2004)

The IC 133 water vapor maser in the galaxy M33: a geometric distance. Argon A.L., Greenhill L.J., Moran J.M., Reid M.J., Menten K.M., Inoue M. <Astrophys. J., 615, 702-719 (2004)> =2004ApJ...615..702A
ADC_Keywords: Masers ; Radio sources ; VLBI ; Proper motions Keywords: galaxies: individual (M33) - ISM: individual (IC 133) - masers Abstract: We report on the results of a 14yr long VLBI study of proper motions in the IC 133 H2O maser source in the galaxy M33. Description: Observations of the H2O maser in IC 133 were made using the US VLBI network and its successor, the Very Long Baseline Array (VLBA), operated by the National Radio Astronomy Observatory (NRAO). The maser was observed on eight different occasions between 1987 and 2001. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 01 33 15.9 +30 53 02 IC 133 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 67 8 Observed bandpasses table4.dat 58 106 IC 133 maser feature positions table5.dat 102 167 IC 133 maser spot positions and proper motions
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 A14 --- ObsDate Date of Observation 16 A1 --- Epoch Epoch number 18- 24 F7.2 km/s VLSR1 First LSR velocity of band center 26- 32 F7.2 km/s VLSR2 ? Second LSR velocity of band center 34- 40 F7.2 km/s VLSR3 ? Third LSR velocity of band center 42- 47 F6.4 km/s Sep Channel separation 49- 52 I4 km/s BW1l Bandwidth 1 - Lower value of the interval 54- 57 I4 km/s BW1h Bandwidth 1 - Upper value of the interval 59- 62 I4 km/s BW2l ? Bandwidth 2 - Lower value of the interval 64- 67 I4 km/s BW2h ? Bandwidth 2 - Upper value of the interval
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Loc The IC 133 location (Main or West) 6- 12 F7.2 km/s VLSR Average channel LSR velocity 14- 17 F4.2 Jy Speak Peak flux density (22GHz) 19- 26 F8.3 mas offX East-West offset (1) 28- 32 F5.3 mas e_offX Uncertainty in offX 34- 40 F7.3 mas offY North-South offset (1) 42- 46 F5.3 mas e_offY Uncertainty in offY 48- 55 A8 --- Obs Epochs observed (in table3.dat) 57 A1 --- f_Obs [c] Indicates proper motions listed in table5.dat
Note (1): Measured with respect to the reference maser feature at the epoch of observation or at epoch 4 if the feature was observed for more than one epoch. If a multi epoch feature was not observed in epoch 4, it was still referred to epoch 4.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Loc The IC 133 location 6- 7 I2 --- Fnum Maser feature number 9- 15 F7.2 km/s VLSR1 ? First LSR velocity for given spectral channel (1) 17- 23 F7.2 km/s VLSR2 ? Second LSR velocity for given spectral channel (1) 25- 31 F7.2 km/s VLSR3 ? Third LSR velocity for given spectral channel (1) 33- 39 A7 --- Ep1 Epoch(s) of first LSR velocity (in table3.dat) 41- 42 A2 --- Ep2 Epoch(s) of second LSR velocity (in table3.dat) 44 A1 --- Ep3 Epoch(s) of third LSR velocity (in table3.dat) 46 A1 --- f_Fnum [W] Indicates all values are weighted averages (3) 48- 55 F8.3 mas offX East-West offset (4) 57- 61 F5.3 mas e_offX Uncertainty in offX 63- 69 F7.3 mas offY North-South offset (4) 71- 75 F5.3 mas e_offY Uncertainty in offY 77- 82 F6.2 uas/yr pmX East-West proper motion (5) 84- 88 F5.2 uas/yr e_pmX Uncertainty in pmX 90- 95 F6.2 uas/yr pmY North-South proper motion (5) 97-101 F5.2 uas/yr e_pmY Uncertainty in pmY
Note (1): Each row corresponds to a single spectral channel. Since there are three different spectral resolutions (see table3.dat), up to three different entries may appear. Note (3): Weighted averages account for the fact that the channels listed are not always statistically independent. See text for details. Note (4): Offsets from the reference feature at epoch 4. Note (5): Motions with respect to the reference feature.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 19-May-2005
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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