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IRAS_PSC: IRAS Point Source Catalogue

Contents

Table name: 	IRAS_PSC
Records: 	245839
Spectral Band: 	IRband
Kind of Object: IRASLog
Mode: 		Survey
PreView:	Spectra
Coordinates: 	B1950, J2000

Reference

PreView

Two IRAS spectra are available for each of 11227 entries of this catalogue.

Description

The primary mission of the Infrared Astronomical Satellite was to conduct a sensitive and unbiased survey of the sky in four wavelength band centered at 12,25,60 and 100 micro-m. The project was initiated in 1985 as a joint of the US, the Netherlands, and the UK. Launced in january 1983, IRAS ceased operation in november 1983 after having successfuly surveyed more than the 96

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".

Fields

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