SIMBAD references

2006MNRAS.365L...1R - Mon. Not. R. Astron. Soc., 365, L1-L5 (2006/January-1)

A multiwavelength investigation of the temperature of the cold neutral medium.

ROY N., CHENGALUR J.N. and SRIANAND R.

Abstract (from CDS):

We present measurements of the HI spin temperatures (Ts) of the cold neutral medium (CNM) towards radio sources that are closely aligned with stars for which published H2ortho-para temperatures (T01) are available from ultraviolet (UV) observations. Our sample consists of 18 radio sources close to 16 nearby stars. The transverse separation of the lines of sight of the corresponding UV and radio observations varies from 0.1 to 12.0 pc at the distance of the star. The UV measurements do not have velocity information, so we use the velocities of low ionization species (e.g. Nai/Ki/Ci) observed towards these same stars to make a plausible identification of the CNM corresponding to the H2absorption. We then find that T01 and Tsmatch within observational uncertainties for lines of sight with H2column density above 1015.8/cm2, but deviate from each other below this threshold. This is consistent with the expectation that in the CNM Tstracks the kinetic temperature due to collisions and that T01is driven towards the kinetic temperature by proton exchange reactions.

Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

Journal keyword(s): ISM: atoms - ISM: molecules - radio lines: ISM - ultraviolet: ISM

Simbad objects: 39

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