High-velocity clouds impacting onto the galactic disk. A new class of X-ray emitting objects.

Details High-velocity clouds impacting onto the galactic disk. A new class of X-ray emitting objects. High-velocity clouds impacting onto the galactic disk. A new class of X-ray emitting objects.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312...67k&link_type=abstract

Astronomy and Astrophysics, v.312, p.67-73

Astronomy and Astrophysics

Astrophysics

27

Ism: Clouds, Galaxy: Halo, Galaxy: Kinematics And Dynamics, X-Rays: Ism, Radio Lines: Ism

Scientific paper

We present observational evidence in ROSAT all-sky survey data that large parts of the high-velocity cloud (HVC) complex C are associated with soft X-ray radiation. Moreover the new Leiden/Dwingeloo northern-sky survey shows very faint HI 21-cm line emission which connects the HVC velocity regime with the low-velocity atomic hydrogen of the galactic disk by velocity bridges. Finally we find a close positional correlation of soft X-ray enhancements and the atomic hydrogen velocity bridges. Thus we obtain for the first time direct evidence that large parts of the HVC complex C are impacting onto the galactic disk. As a consequence, the HVCs of complex C are closer to the galactic disk than previously assumed. Most probably the gas of the Reynolds and/or Lockman layers are the collision partners of the HVCs.

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