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Table name: IRAS_PSC Records: 245839 Spectral Band: IRband Kind of Object: IRASLog Mode: Survey PreView: Spectra Coordinates: B1950, J2000
The results of several portions of the IRAS mission are given in a catalog of infrared point source that give the characteristic of some 250,000 point source. The catalogue characteristics at the wavelength :
Wavelength 12 25 60 100
Flux density (Jy) 5.5 .5 1.5
Resolution(') .5 1 1 2
The positional accuracy of source detected by IRAS depend on their size,
brightness and spectral energy distribution but is usually better than 20".
Name Type Meaning
name A Point Source Name (IRAS designation)
r_a1950 I 1950 Right Ascension
dec1950 I 1950 Declination
major I major semi-axis of the uncertainty ellipse (")
minor I minor semi-axis of the uncertainty ellipse (")
posang I position of major ellipse axis (from North, degrees)
r_a I J2000 Right Ascension
dec I J2000 Declination
lii I Galactic longitude
bii I Galactic latitude
nhcon I Number of times observed
f1 F the flux in Janskys (= 10-26W/m/m/Hz) at 12 (mu )m
f2 F the flux in Janskys at 25 (mu )m
f3 F the flux in Janskys at 60 (mu )m
f4 F the flux in Janskys at 100 (mu )m
q_f1 I quality as 1 (upper limit), 2 (moderate) or 3(high)
for 12 (mu )m passband
q_f2 I quality (see q_f1) for 25 (mu )m passband
q_f3 I quality (see q_f1) for 60 (mu )m passband
q_f4 I quality (see q_f1) for 100 (mu )m passband
u_f1 I Percent relative flux density uncertainty at 12 (mu )m
u_f2 I Percent relative flux density uncertainty at 25 (mu )m
u_f3 I Percent relative flux density uncertainty at 60 (mu )m
u_f4 I Percent relative flux density uncertainty at 100 (mu )m
tsnr1 I 10x(Signal/Noise) for passband, limited to 30000
tsnr2 I 10x(Signal/Noise) for passband, limited to 30000
tsnr2 I 10x(Signal/Noise) for passband, limited to 30000
tsnr3 I 10x(Signal/Noise) for passband, limited to 30000
nlrs I number of significant lrs
lrsc I characterisation of the Low Resolution Spectrum
cc A point-source correlation coefficient:
| % |% |% |% |% | % |% |
| 100 A |99 B |98 C |97 D | 96 E | 95 F |94 G |
| 93 H |92 I |91 J |90K | 89 L | 88 M |87 N |
var I Percent probability (0 to 99) that the source is
variable (-1 indicates that the source was not
examined for variability)
disc I flux discrepancies, as 4 bits
conf I confusion flags , as 4 bits
pnearh I no. of nearby hours-confirmed point sources, limited
to 9
pnearw I no. of nearby weeks-confirmed point sources, limited
to 9
ses1 I number of seconds-confirmed small extended sources in
each passband: SES1>1 means that the source may be a
point-source like piece of a complex field
ses2 I number of weeks-confirmed small extended sources
hsd I location in high source density bin, as 4 bits
cirr1 I value>3 may indicate contamination by cirrus
cirr2 I value>4 if structure in the 100-(mu ) emis. is present
cirr3 I total surface brightness of the sky surrounding the
source at 100 mu, in MJy/sr;
cirr3>30 indicates emission from dust with appreciable
column density
nid I number of positional associations
idtype I type of object association: 1 for extragalactic, 2 for
stellar,_3 for other, 4 for multiple
col1 F the colour formed by taking -2.5 * log(f25/f12)
col2 F the colour formed by taking -2.5 * log(f60/f25)
_col3 F the colour formed by taking -2.5 * log(f100/f60)
IRAS PSC Associations
These fields list information about objects associated with IRAS
point-sources.
Fields
Name Type Meaning
catno I Catalogue number (see Sources)
name A Name of the object in catno catalogue
type A Character or spectral type from (catno, source)
radius I Distance of (catno, source) object to the IRAS
source (")
pos I Angle of radius vector (degrees, North to East)
fld1 I further information from (catno, source), (mag)
fld2 I further information from (catno, source), (mag)
fld3 I further information from (catno, source), (size)
no Catalogue Contents
1 GCVS (Var. *) fld2 and fld3 are magnitudes in deci-mag
fld1 fld2 fld3
1 Bmax Bmax
2 Vmax Vmin
3 pg(max) pg(min)
4 vis(max) vis (min)
5 999 0
2 DO (Red *) fld2 and fld3 are magnitudes in deci-mag
fld1 fld2 fld3
1 red mag. 0
2 999 0
3 AFGL fld1: magnitude at 4.2(mu)m (decimag)
fld2: magnitude at 11(mu)m (decimag)
fld3: magnitude at 27(mu)m (decimag)
4 2-micron fld1: K magnitude (decimag)
fld2: I magnitude (decimag)
5 Globules fld1: 999
fld2: Minimum diameter (arcsec)
fld3: Maximum diameter (arcsec)
6 RC2 fld1: Harvard V magnitude (decimag)
fld2: B_T (decimag)
fld3: D_0 (arcsec)
7 Em. * fld1: V magnitude (decimag)
fld2: 999
fld3: 0
8 Equat. IR fld1: Flux density at 2.7(mu)m (10**-16W/cm**2/(mu)m)
fld2: 999
fld3: 0
9 UGC fld1: Zwicky magnitude (decimag)
fld2: Minimum diameter in B (arcsec)
fld3: Maximum diameter in B (arcsec)
10 MCG fld1: 999
fld2: Minimum diameter in B (arcsec)
fld3: Maximum diameter in B (arcsec)
11 PN fld1: V magnitude of Nebula (decimag)
fld2: V magnitude of Central Star (decimag)
fld3: Minimum diameter of Nebula (arcsec)
12 Zwicky Gal. fld1: Zwicky magnitude (decimag)
fld2: 999
fld3: 0
13 SAO fld1: V magnitude (decimag)
fld2: p_g magnitude (decimag)
fld3: 0
14 ESO/Uppsala fld1: B magnitude (decimag)
fld2: Minimum diameter (arcsec)
fld3: Maximum diameter (arcsec)
15 HR (BS) fld1: V magnitude (decimag)
fld2: B-V magnitude (centimag)
fld3: U-B magnitude (centimag)
16 Suspected V* fld1: V magnitude at maximum (decimag)
fld2: 999
fld3: 0
17 C* fld1: p_g magnitude (decimag)
fld2: V magnitude (decimag)
fld3: I magnitude (decimag)
18 Gliese fld1: V magnitude (decimag)
fld2: B-V magnitude (millimag)
fld3: U-B magnitude (millimag)
19 S* fld1: p_g magnitude (decimag)
fld2: V magnitude (decimag)
fld3: I magnitude (decimag)
20 PKS (Parkes) fld1: 999
fld2: Minimum diameter (arcsec)
fld3: Maximum diameter (arcsec)
21 Bonn HII fld1: Flyx density at 4.875GHz (Jy)
fld2: diameter (arcsec)
fld3: 0
22 Blitz fld1: diameter (arcsec)
fld2: V_CO (km/s)
fld3: Peak T_A (K)
23 OSU fld1: 999
fld2: 999
fld3: diameter (arcsec)
24 IRC fld1: Right ascension difference (IRC-IRAS)
(deciseconds of time)
fld2: Declination difference (IRC-IRAS)
(deciseconds of arc)
fld3: 0
25 DDO fld1: 999
fld2: 999
fld3: 0
26 Arp fld1: 999
fld2: 999
fld3: 0
27 Markarian fld1: 999
fld2: 999
fld3: 0
28 Strong 5GHz fld1: V magnitude (decimag)
fld2: 5GHJz flux density (dJy)
fld3: 0
29 Veron+Veron fld1: V magnitude (decimag)
fld2: milliredshift
fld3: 0
30 Zwicky fld1: 999
fld2: 999
fld3: 0
31 VV fld1: 999
fld2: 999
fld3: 0
32 IRAS Small fld1: Hex coded bands
fld2: 999
fld3: 0
39 OSU Radio fld1: Frequency
fld2: Flux (dJy)
fld3: 0
40 Michigan Spec. fld1: Magnitude (decimag)
fld2: HD number (low byte)
fld3: HD number (high byte)
41 Serendipitous fld1: Hex coded SSC bands
fld2: first SSC flux (mJy)
fld2: 999
fld3: second SSC flux