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Title:
A Cold Nearby Cloud inside the Local Bubble
Authors:
Meyer, David M.; Lauroesch, J. T.; Heiles, Carl; Peek, J. E. G.; Engelhorn, Kyle
Affiliation:
AA(Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208; , ; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.), AB(Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208; , ), AC(Department of Astronomy, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720-3411 , , ), AD(Department of Astronomy, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720-3411 , , ), AE(Department of Astronomy, University of California at Berkeley, 601 Campbell Hall, Berkeley, CA 94720-3411 , , )
Publication:
The Astrophysical Journal, Volume 650, Issue 1, pp. L67-L70. (ApJL Homepage)
Publication Date:
10/2006
Origin:
UCP
ApJ Keywords:
ISM: Atoms, ISM: Clouds, ISM: Structure, Galaxy: Solar Neighborhood
DOI:
10.1086/508658
Bibliographic Code:
2006ApJ...650L..67M

Abstract

The high-latitude Galactic H I cloud toward the extragalactic radio source 3C 225 is characterized by very narrow 21 cm emission and absorption indicative of a very low H I spin temperature of about 20 K. Through high-resolution optical spectroscopy, we report the detection of strong, very narrow Na I absorption corresponding to this cloud toward a number of nearby stars. Assuming that the turbulent 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-sight turbulent velocity of 0.37+/-0.08 km s-1 from a comparison of the H I and Na I absorption line widths. We also place a firm upper limit of 45 pc on the distance of the cloud, which situates it well inside the Local Bubble in this direction and makes it the nearest known cold diffuse cloud discovered to date.
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