A Cold Nearby Cloud inside the Local Bubble | Zendy

David M. Meyer | Zendy; J. T. Lauroesch | Zendy; Carl Heiles | Zendy; J. E. G. Peek | Zendy; K. Engelhorn | Zendy

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A Cold Nearby Cloud inside the Local Bubble

Author(s) -

David M. Meyer,

J. T. Lauroesch,

Carl Heiles,

J. E. G. Peek,

K. Engelhorn

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/508658

Subject(s) - physics , astrophysics , line of sight , stars , absorption (acoustics) , line (geometry) , local bubble , bubble , cloud computing , turbulence , spectroscopy , astronomy , galaxy , interstellar medium , optics , meteorology , geometry , mathematics , mechanics , computer science , operating system

The high-latitude Galactic H I cloud toward the extragalactic radio source 3C225 is characterized by very narrow 21 cm emission and absorption indicative ofa very low H I spin temperature of about 20 K. Through high-resolution opticalspectroscopy, we report the detection of strong, very narrow Na I absorptioncorresponding to this cloud toward a number of nearby stars. Assuming that theturbulent H I and Na I motions are similar, we derive a cloud temperature of 20(+6, -8) K (in complete agreement with the 21 cm results) and a line-of-sightturbulent velocity of 0.37+/-0.08 km/s from a comparison of the H I and Na Iabsorption linewidths. We also place a firm upper limit of 45 pc on thedistance of the cloud, which situates it well inside the Local Bubble in thisdirection and makes it the nearest-known cold diffuse cloud discovered to date.Comment: 11 pages, 3 figures, accepted for publication in ApJ Letter

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