J/A+AS/93/399 Optical ident. of steep spectrum radio sources (Wieringa+ 1992)
Optical identifications of faint ultra-steep spectrum radio sources
WIERINGA M.H., KATGERT P.
<Astron. Astrophys. Suppl. Ser. 93, 399 (1992)>
=1992A&AS...93..399W 1992A&AS...93..399W
Keywords: Galaxies: radio - Galaxies: formation of
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 118 86 Radio sources with optical CCD data
table2 102 26 Radio sources without deep CCD images
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Byte-by-byte Description of file: table1 table2
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name The standard name of the object, this
corresponds to the name in the middle of the
first line above each plot in Fig.3.
(note the unconventional naming of the first
two sources)
11- 12 I2 h RAh Right Ascension B1950 (hours)
14- 15 I2 min RAm Right Ascension B1950 (minutes)
17- 21 F5.2 s RAs Right Ascension B1950 (seconds)
23- 25 F3 s e_RA sigma on RA
27- 28 I2 deg DEd Declination B1950 (degrees)
30- 31 I2 arcmin DEm Declination B1950 (minutes)
33- 36 F4.1 arcsec DEs Declination B1950 (seconds)
39- 41 F3.1 arcsec e_DE sigma on DE
43- 45 A3 --- posCode indicates which observation was used for the
radio position given:
20A=VLA A-array, 20cm,
20C=VLA C-array 20cm,
49=49cm WSRT,
92=92cm WSRT
49- 51 I3 mJy S92 Flux density at 327MHz
56- 57 I2 mJy e_S92 error on S92
61- 63 I3 mJy S49 Flux density at 608MHz
68- 69 I2 mJy e_S49 error on S49
72- 76 F5.1 mJy S20 Flux density at 1490MHz
81- 83 F3.1 mJy e_S20 error on S20
86- 88 F3.1 --- alpha Weighted spectral index over 327-1490 MHz.
90 A1 --- n_alpha Note on alpha: 'S' for steepening and 'F' for
flattening of the spectrum toward
higher frequency
92 A1 --- Structure C=Compact/Unresolved sources,
E=Extended sources,
D=Doubles,
T=Triples
95- 97 I3 arcsec psi Major axis
100-102 I3 deg pa position angle
104-107 F4.1 mag R R magnitude (KPNO R-band) of optical candidate
110-112 A3 --- NoteR Notes for the radio data:
+ for a steep spectrum source belonging
to the sample,
- for a source no longer in the sample because
or its radio spectrum
* indicates a note (see below)
115-117 A3 --- NoteO Notes for optical data:
+ for a reliable of highly probable
identification
- for an empty field (R > 23.5, unless noted
otherwise below in the Notes)
S identification likely but not certain due
to complex radio structure
F very faint but probably correct id.
P probable id. with radio-optical position
difference in the range 2-3"
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Notes to table1:
0636+4594 close to 17 magn. star (7" SW), no id.
0636+4599 missing flux + position shift for 20A map, prob. diffuse comp.
NW resolved out, SE comp coinc. with opt. object
0639+442 spectrum not steep (prob. resolution effect at 49cm), 3 opt.
candidates, most likely one is given
0642+443 no high res. radio data, no id. near 92 or 49 cm pos.
0644+437 stellar object (18.9) at 5" SE
0645+433 no id. (5*15m total int., R>24)
0649+446 20C: good fit by two gaussian comps( SW: 11"@18; NE: 15"@27),
missing flux at 20A; no reliable id. due to radio struct., 2
candidates:19.5 at 064945.29,43832.0, 22.6 at 064945.75, 443843.5
0653+446 missing flux at 20A; prob. identification with aligned, extended
object
0654+448 optical obj. extended to SE, cosmic ray 2"W
0822+711 20A shows 2, prob. unrelated, components, both steep
(NW:1.6, SE:1.0), but individually below flux cutoff; NW unid.,
SE id. with 21.7 obj.
0829+698 double + faint unrelated comp. NW at 20A, star (R=13) at 10"SE
prevents identification
0831+457 no high res. data; probable faint fuzzy id. close to star (20"SW)
0834+702 id. non stellar
0836+458 no opt. obj. within 10"
0838+450 poss. triple (based on 20C position and hint of S comp. in 20A),
spectrum slightly concave (1.4-1.2); id. elongated to S,
poss. 2nd obj. 3" S of core
0838+456 poss. triple; faint, compact id. probable due to radio struct.,
brighter obj.(19.3) 6"NW on N comp.
0839+4573 not detected at 20 cm; no R<23.5 obj. near low freq. positions
0839+451 opt. object at limit of detection
0839+693 flux missing at 20A; 2nd opt. object (22.3, size 3"@150) at 3"N
(49.987,11.69)
0841+440 no longer in sample (not steep); complex radio structure prevents
id.
0841+688 poss. triple with core at 22.5, 58; no id., cosmic near radio pos.
0842+443 pos. shift and C map hint at steep N comp., poss. missing flux at
high freq.; no id. near radio peak or poss. midpoint
0842+450 below flux limit
0845+687 20 C map is poor (single snapshot)
0846+718 poss. ext. towards W (pos. shift and C map); no convincing id.,
faint cand. (23.5) at 4"SE
0846+445 20C: 3 comps, prob. unrelated, 20A: N comp.(brightest) double ;
prob id., 2.4" from midpoint of double
0848+445 spectrum may flatten (1.2-1.0); no conv. id. (poss. very faint ext.
obj. 1.8"S of 20C pos.)
0851+717 poss. very faint id. (23.8) near midpoint, pointlike (not cosmic,
cosmic SE)
1217+664 faint ext. obj. within 1", br. double (21.6) 4" E
1221+669 20A shows double with poss. faint core, off axis, low freq. pos.
near strongest comp.; poss. core coinc. with ext. obj., 2nd obj. 4"W
1222+675 20A shows triple; poss. faint id. (23.8) at (07.77, 41.74) on N
comp. (08.077, 41.81)
1223+672 no id. within 7"
1226+658 flux missing at 20A; diffuse (22.6, 3"@75) obj. at 3.5"E with faint
comp. (24) near 20A pos.
1228+652 no id., cosmic ray nearby
1233+656 double at 20C, resolved out at 20A (poss. 2-3sigma det.); poss. id
(22.6) at 2.5"NE of 20C c.o.g.
1233+655 id. unlikely due to distance, higher res. radio data needed
1233+678 flux missing at 20A, uneq. double or triple (4" flux∼2 mJy)
1235+655 only low frequency data, id. probable
1240+682 20C shows double + unrel comp. S; 20A shows two ext. comps (N);
fuzzy id.
1245+667 double at 20A, flattens (1.15-0.9); compact id.
1246+655 flux missing at 20A + position shift W, poss. comp. missing to E;
R=21.9 obj. likely id. because of radio str. and low freq. pos.
1247+666 fairly bright id. (20.4) in glare of star
1302+676 double at 20C, undet at 20A (hint of W comp); 2 opt cand. N one
most probable (fuzzy) pos. offset acceptable based on radio
structure (other obj. at 36.34s, 12.9' with R=22.8)
1304+668 20A shows core with wide tail NW
1401+732 nonstellar, bright id
1403+730 double at 20C and 20A, bridge between comps; 23.4 obj <1" from
c.o.g.
1412+728 likely id. (single 15m exposure, br. star NE)
1413+731 between 2 stars, limit R>23
1414+743 close double + prob. unrel. comp. SE at 20A; no id near double
1415+717 id close to central comp. (2 other obj. SE and SW)
(End) Heinz Andernach - Francois Ochsenbein [CDS] 11-Jun-1993