Twice the rotation velocity of the gas
(logarithm of
km/s) with uncertainty and
quality flag in parentheses

This quantity is the logarithm of a radio line width. It corresponds
roughly to log of twice the velocity rotation.

Telescope

The definitions are given in the "telescope_codes" table:

Level of the measurement (when it is line width)

code | definition |
---|---|

0 |
undefined level (or rotation
curve) |

1 |
20% of the maximum |

2 |
25% of the maximum |

3 |
35% of the maximum |

4 |
40% of the maximum |

5 |
50% of the maximum |

6 |
20% of the mean flux |

7 |
25% of the mean flux |

8 |
50% of the mean flux |

9 |
mean of code 1 and 8 |

11 |
20% of the mean of the two peak values, W2P20 |

12 |
25% of the mean of the two peak values, W2P25 |

13 |
50% of the mean of the two peak values, W2P50 |

line code | definition |
---|---|

1 |
measurement from rotation curve |

2 |
measurement from radio line width |

HyperLeda | Questions: leda@univ-lyon1.fr |