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J/ApJS/123/219 Planetary Nebulae in NRAO VLA Sky Survey (Condon+, 1999)
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Infrared planetary nebulae in the NRAO VLA Sky Survey.
Condon J.J., Kaplan D.L., Terzian Y.
<Astrophys. J. Suppl. Ser. 123, 219 (1999)>
=1999ApJS..123..219C
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ADC_Keywords: Planetary nebulae ; Infrared sources ; Radio sources
Keywords: catalogs - dust, extinction - infrared: ISM: continuum -
planetary nebulae: general - radio continuum: ISM
Abstract:
In order to construct a sample of planetary nebulae (PNe) unbiased by
dust extinction, we first selected the 1358 sources in the IRAS Point
Source Catalog north of J2000 declination DE=-40{deg} having measured
S(25{mu}m)>=1 Jy and colors characteristic of PNe: detections or upper
limits consistent with both S(12{mu}m)<=0.35S(25{mu}m) and
S(25{mu}m)>=0.35S(60{mu}m). The majority are radio-quiet contaminating
sources such as asymptotic giant branch stars. Free-free emission from
genuine PNe should make them radio sources. The 1.4 GHz NRAO VLA Sky
Survey (NVSS) images and source catalog were used to reject
radio-quiet mid-infrared sources. We identified 454 IRAS sources with
radio sources brighter than S~2.5 mJy/beam (equivalent to T~0.8K in
the 45" FHWM NVSS beam) by positional coincidence. They comprise 332
known PNe in the Strasbourg-ESO Catalogue of Galactic Planetary
Nebulae and 122 candidate PNe, most of which lie at very low Galactic
latitudes. Exploratory optical spectroscopic observations suggest that
most of these candidates are indeed PNe optically dimmed by dust
extinction, although some contamination remains from H II regions,
Seyfert galaxies, etc. Furthermore, the NVSS failed to detect only 4%
of the known PNe in our infrared sample. Thus it appears that radio
selection can greatly improve the reliability of PN candidate samples
without sacrificing completeness.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 26 Optical and radio data on GPN PNe
table2.dat 22 332 Detected GPN PNe
table3.dat 116 122 Radio and optical data for candidate PNe
table4.dat 60 19 *Optical Spectra of brighter candidate PNe
notes.dat 80 158 Individual notes
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Note on table4.dat: observation made in April 1998 at the Palomar
60 inch telescope in grating mode, resolution 3.5{AA}/pix
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See also:
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- PNG Name of Galactic PN (Cat. <V/84>)
12- 13 I2 h RA1950h Optical right ascension (B1950)
15- 16 I2 min RA1950m Optical right ascension (B1950)
18- 21 F4.1 s RA1950s Optical right ascension (B1950)
23 A1 --- DE1950- Optical declination sign (B1950)
24- 25 I2 deg DE1950d Optical declination (B1950)
27- 28 I2 arcmin DE1950m Optical declination (B1950)
30- 31 I2 arcsec DE1950s Optical declination (B1950)
33- 34 I2 h RAh Optical right ascension (J2000)
36- 37 I2 min RAm Optical right ascension (J2000)
39- 42 F4.1 s RAs Optical right ascension (J2000)
44 A1 --- DE- Optical declination sign (J2000)
45- 46 I2 deg DEd Optical declination (J2000)
48- 49 I2 arcmin DEm Optical declination (J2000)
51- 52 I2 arcsec DEs Optical declination (J2000)
54- 55 I2 arcsec e_Pos ? rms uncertainty on optical position
57- 58 I2 h RAr.h ? Radio right ascension (J2000)
60- 61 I2 min RAr.m ? Radio right ascension (J2000)
63- 67 F5.2 s RAr.s ? Radio right ascension (J2000)
69- 72 F4.2 s e_RAr.s ? rms uncertainty on RArs
74 A1 --- DEr.- ? Radio declination sign (J2000)
75- 76 I2 deg DEr.d ? Radio declination (J2000)
78- 79 I2 arcmin DEr.m ? Radio declination (J2000)
81- 84 F4.1 arcsec DEr.s ? Radio declination (J2000)
86- 88 F3.1 arcsec e_DEr.s ? rms uncertainty on DErs
90 A1 --- l_S1.4GHz [><~] Limit flag on S1.4GHz
91- 95 F5.1 mJy S1.4GHz NVSS 1.4GHz flux density
97-100 F4.1 mJy e_S1.4GHz ? rms uncertainty on S1.4GHz
102-103 I2 arcsec PhiM ? Deconvolved FWHM major diameter
104 A1 --- --- [x]
105-106 I2 arcsec Phim ? Deconvolved FWHM minor diameter
108-110 F3.1 --- c ? Extinction coefficient (log of the
H{beta} extinction)
112 A1 --- Note [E*] Extended source, or note (1)
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Note (1):
E: extended source
*: Note detailed in file notes.dat
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS PSC name
12- 21 A10 --- PNG IAU name PN G
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS PSC name
12- 16 F5.1 deg GLON Galactic longitude
17- 21 F5.1 deg GLAT Galactic latitude
23- 24 I2 h RA1950h NVSS right ascension (B1950)
26- 27 I2 min RA1950m NVSS right ascension (B1950)
29- 33 F5.2 s RA1950s NVSS right ascension (B1950)
35 A1 --- DE1950- NVSS declination sign (B1950)
36- 37 I2 deg DE1950d NVSS declination (B1950)
39- 40 I2 arcmin DE1950m NVSS declination (B1950)
42- 45 F4.1 arcsec DE1950s NVSS declination (B1950)
47- 48 I2 h RAh NVSS right ascension (J2000)
50- 51 I2 min RAm NVSS right ascension (J2000)
53- 57 F5.2 s RAs NVSS right ascension (J2000)
59- 62 F4.2 s e_RAs rms uncertainty on RA2s
64 A1 --- DE- NVSS declination sign (J2000)
65- 66 I2 deg DEd NVSS declination (J2000)
68- 69 I2 arcmin DEm NVSS declination (J2000)
71- 74 F4.1 arcsec DEs NVSS declination (J2000)
76- 79 F4.1 arcsec e_DEs rms uncertainty on DE2s
81- 85 F5.1 mJy S1.4GHz NVSS 1.4GHz flux density
87- 90 F4.1 mJy e_S1.4GHz rms uncertainty on S1.4GHz
92- 93 I2 h RAopt.h ? Optical right ascension (J2000)
95- 96 I2 min RAopt.m ? Optical right ascension (J2000)
98-101 F4.1 s RAopt.s ? Optical right ascension (J2000)
103 A1 --- DEopt.- Optical declination sign (J2000)
104-105 I2 deg DEopt.d ? Optical declination (J2000)
107-108 I2 arcmin DEopt.m ? Optical declination (J2000)
110-111 I2 arcsec DEopt.s ? Optical declination (J2000)
113 I1 arcsec e_Pos ? rms uncertainty on optical position
115 A1 --- Note [*] a note is detailed in notes.dat file
116 A1 --- Osp [4] when an optical spectrum was taken
(see table 4)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- IRAS IRAS PSC name
11 A1 --- m_IRAS Multiplicity indicator on IRAS name
15- 18 I4 s tInt Observation integration time
20 A1 --- Det [NY] Detection flag
22- 23 A2 --- PNe [NY? ] PNe flag
25 A1 --- l_Ha Limit flag on Ha
26- 30 F5.1 --- Ha ? Line strength of H{alpha} (1)
34 A1 --- l_[NII] [~] Limit flag [NII]
35- 38 F4.1 --- [NII] ? Line strength of [NII] 658.3nm (1)
40- 43 F4.1 --- [SII] ? Line strength of [SII] 673.0nm (1)
45- 49 F5.2 --- [OIII] ? Line strength of [OIII] 500.7nm (1)
51- 54 F4.2 --- [OI] ? Line strength of [OI] 630.0nm (1)
55 A1 --- l_c Limit flag on c
56- 59 F4.1 --- c ? Extinction coefficient (2)
60 A1 --- Note [*] indicates a note detailed in file notes.dat
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Note (1): intensity relative to H{beta}
Note (2): c is estimated from the differential reddeding between
H{alpha} and H{beta} by the formula:
c = log((H{alpha}/H{beta})/2.86) / (1-fa)
where fa =~ 0.335 is the expected ratio of extinctions at
H{alpha} and H{beta} wavelengths.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name IRAS or PNG Name
16 A1 --- m_Name Multiplicity index on IRAS
18- 80 A63 --- Note Text of the note
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History: From ApJS electronic version
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(End) James Marcout, Patricia Bauer, Francois Ochsenbein [CDS] 14-Sep-1999