New observations of positive high velocity clouds

Astronomy and Astrophysics – Astrophysics

Scientific paper

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17

Galactic Structure, Hydrogen Clouds, Magellanic Clouds, Neutral Gases, Radial Velocity, Angular Distribution, Galactic Rotation, Milky Way Galaxy

Scientific paper

The HI complex HVC 287.5 plus 22.5 plus 240 and the clouds HVC 271 plus 11 plus 258 and HVC 273 plus 9.5 plus 258 have been observed with the IAR radiotelescope. The results show for the complex the presence of narrow and broad components in the angular distribution and in the velocity profiles. The whole feature is elongated extending from 14 deg to 28 deg in latitude, along the N-S direction, with an almost constant velocity gradient. The HI on HVC 271 plus 11 plus 258 seems also to show the presence of more than one component in the velocity profiles. No HI connecting both clouds has been detected. HI masses have been estimated as 3500 D squared and (380 plus 210) D squared solar masses for the complex and for the two clouds respectively.

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