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1987A&A...171..261Caswell & Haynes

Southern HII Regions: study of radio recombination line emission

J.L. Caswell & R.F. Haynes

Summary

We tabulate velocities and other parameters of hydrogen recombination lines near 5 GHz (H109a and H110a) for 316 HII regions observed with the Parkes 64-m radio telescope; results of a new search for formaldehyde absorption are also listed. Many of these radi HII regions lie beyond the range of optical detection, at distances exceeding several kpc; they thus provide a comprehensive coverage of the southern HII regions in the Galaxy over the longitude range 210 to 360^o and consistute a vital data base for the study of galactic structure.

Changes made for this electronic version: duplicate coordinates in glong/glat were appended by a and b values applying to both of these components are marked by a trailing '}'

318.058-0.459 the string 'see preceding source' was replaced by entries from the following source (apparently an error in the original paper) 326.230 +0.976 string 'part of next source' moved to last column

parentheses around temperatures T_e were replaced by a trainling colon.

References to column 15 are abbreviated as follows:

C Caswell (1972)

N Note in text, Section 4

W Wilson et al. (1970)

Ch Churchwell et al. (1974)

HD Huchtmeier and Day (1975)

S Shaver et al. (1983)

CC Caswell and Clark (1975)

CHC, Caswell et al. (1975a).

In column 16, "V", or a specific nebula name, denotes the presence of a visible optical counterpart, and "A" indicates the absence of an optical counterpart.

"N(HI)" and "F(HI)" indicate a preference for the near or far kinematic distance based on HI absorption data.

Table 1. Hydrogen recombination line data for southern HII regions

H recombination line Derived Parameters Ref. Opt. 
glong    glat   RA_1950     DEC_1950   T_C/K Theta/'   S/Jy   v_H2CO         T_L/K dV    V    T_e/K   R_G/kpc D/kpc
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2----+----3
233.761-0.191  072752.7-182608   0.89    3.1     1.8   +43             0.046  28  +46   7400   13.0    4.2              R8
243.159+0.372  075018.4-261753   3.65   25      13       ?             0.123  27  +52  11000   13.0    5.0              R16