Table 2.2: References to 2.7GHz survey.

In document Optical emission lines in radio sources of intermediate power (Page 33-35)

S u r v e y p a rt R .A . ra n g e D e c . R a n g e S l i m i t ( J a n s k y ) R e fe r e n c e 3 3 \ l l \ l 9 \ 2 3 h - 3 3 ° to - 7 5 ° 0 . 2 5 S h i m m i n s ( 1 9 7 1 ) 6 9h to 16h30m 18h30m to 7h15m - 3 0 ° to - 3 5 ° 0.20 S h i m m i n s & B o l t o n ( 1 9 7 1 ) 7 8h to 17h 19h30m to 6h30m o O C O 1 0 -4-3 O 1 0.6 B o l t o n et al. ( 1 9 7 5 ) 11 22h to 5h o O C O 1 0 o 1 0 . 2 5 W a l l et al. ( 1 9 7 6 ) 13 10h to 15h - 1 5 ° to - 3 0 ° 0 . 2 5 S a v a g e et al. ( 1 9 7 7 ) 14 10h to 15h - 4 ° to - 3 0 ° 0 . 2 5 B o l t o n et al. ( 1 9 7 9 )

Table 2.3 p resen ts th e resu lts of a lite ra tu re survey for all observations of th e sources in ou r sam ple (excluding radio observations as p a rt of th e Parkes su r­ vey). This lite ra tu re survey was carried o u t m ainly by searching th ro u g h indexes of various jo u rn als as well as A stro n o m y and Astrophysics Abstracts for papers referring to radio surveys or radio sources in the so u th ern hem isphere. References w ith in these p ap ers were also followed up. M ost of th e p apers containing o p ti­ cal identifications come from investigators engaged in th e original P arkes surveys an d are published in th e Australian Journal of Physics Astrophysical Supplement.

R edshift d a ta come from m an y different sources. A p articu larly useful source- book for redshifts is th e Catalogue of Radial Velocities of Galaxies (P alum bo, T anzella-N itti &; V ettolani, 1983) which contains an extensive list of references and galaxy ra d ia l velocities m easured before th e end of 1980. In all cases the publications referenced in ta b le 2.3 were checked for accuracy. C om parisons were m ade w ith o th e r publications where applicable. T he inform ation listed in table 2.3 is:

C o lu m n 1: Parkes designation.

C o lu m n 2: References to o ptical identifications of th e radio sources. Of those w ith m ultiple references, some confirm th e original identification w hilst o th ers suggest a lte rn ativ e identifications. These are dis­ cussed below for individual objects.

C o lu m n 3: References to m easurem ents of redshift for th e identified galaxies.

C o lu m n 4: O th er references. This is a ra th e r heterogeneous category con­ taining any oth er references to the source. Some m ay merely m en tio n the object in a table while others are in -d ep th studies. G enerally these references contain optical sp ectra, p hotom etry or radio m aps. Of p a rtic u la r signifigance is reference 28 (Ekers

et al. 1988) which presents pre-com pletion VLA observations of a num b er of P arkes radio sources. O ptical d a ta are also presented in com panion papers.

References corresponding to th e num bers in tab le 2.3 are given in table 2.4.

2.4:

Optical identifications.

Some of th e sources in tab le 2.3 have m ore th a n one reference for the optical identifications. These m ultiple identifications are in agreem ent for m ost of the sources. In th e light of b e tte r radio m aps available to us we are able to distinguish th e correct identification where m ore th a n one has been proposed. F urtherm ore, on th e basis of accu rate positions for th e radio core we find some sources where a previous identification m ust be rejected b u t no a lte rn ativ e identification is found.

T h e sources discussed below are only those for which new inform ation re­ garding th e o p tical identification has been found. Any sources ap p earin g in table 2.1 an d not discussed in th is section m ust be regarded as having a reliable op­ tical identification. Sources listed in tab le 2.3 w ith m ore th a n one reference to an o ptical identification an d no t discussed here m ay be assum ed to have all cited identifications in agreem ent.

D iscussion of individual sources w ith new inform ation on th e optical id en ti­ fication follows:

0 2 0 7 -2 2 4 : B olton, Shim m ins and W all (1975) identified this radio source w ith a m ag n itu d e 15.5 elliptical galaxy. O ur VLA m ap shows the source to be unresolved and lying in a blank field approxim ately 5.6 arcm in u tes n o rth of th e original identification. No obvious optical c o u n terp art is seen on eith er th e ESO B or R plates. A ccurate coordinates from th e VLA m ap are: 02 07 50.96 ± 0.04 - 2 2 27 44.0 ± 0 .6 .

0 2 2 9 -2 0 8 : B olton, Shim m ins and W all (1975) identified th is radio source w ith the b rig h te r com ponent of a double elliptical galaxy. Bozyan (1979) suggested the fa in te r com ponent as th e tru e identification.

Table 2.3: R eferences to previous work.

In document Optical emission lines in radio sources of intermediate power (Page 33-35)