J/ApJ/694/222 Extragalactic point sources in WMAP 5-yr maps (Chen+, 2009)
Extragalactic point source search in five-year WMAP 41, 61, and 94 Ghz maps. Chen X., Wright E.L. <Astrophys. J., 694, 222-234 (2009)> =2009ApJ...694..222C
ADC_Keywords: Cross identifications ; Radio sources ; Surveys Keywords: catalogs - cosmic microwave background - cosmology: observations - methods: data analysis Abstract: We present the results of an extragalactic point source search using the five-year Wilkinson Microwave Anisotropy Probe (WMAP) 41, 61, and 94GHz (Q, V, and W bands) temperature maps. This work is an extension of our designing and applying a cosmic microwave background (CMB)-free technique to extract point sources in the WMAP maps. Specifically, we have formed an internal linear combination map of the three-band maps, with the weights chosen to remove the CMB anisotropy signal as well as to favor the selection of flat-spectrum sources. We have also constructed a filter to recover the true point source flux distribution on the sky. A total of 381 sources are found in our study at the >5σ level outside the WMAP point source detection mask, among which 89 are "new" (i.e., not present in the WMAP catalogs). Source fluxes have been calculated and corrected for the Eddington bias. We have solidly identified 367 (96.3%) of our sources, the 1σ positional uncertainty of which is 2'. The 14 unidentified sources could be either extended radio structure or obscured by Galactic emission. We have also applied the same detection approach to simulated maps, which yielded 364±21 detections on average. The recovered source distribution N(>S) agrees well with the simulation input, which proves the reliability of this method. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 86 367 Identified point sources from five-year Q-, V-, and W-band ILC (internal linear combination) map table2.dat 76 14 Unidentified point sources from five-year Q-, V-, and W-band ILC (internal linear combination) map
See also: VIII/40 : GB6 catalog of radio sources (Gregory+ 1996) VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-1996) VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981) J/ApJS/180/283 : WMAP source catalog (Wright+, 2009) J/A+A/508/107 : WMAP3 catalogue (Giommi+, 2009) J/MNRAS/392/733 : The NEWPS catalog from WMAP 5-yr survey (Massardi+, 2009) J/MNRAS/384/775 : Bright Source Sample of AT20G Survey (Massardi+, 2008) J/AZh/85/483 : Sources from the WMAP catalog (Vol'vach+, 2008) J/ApJ/681/747 : Extragalactic point-source WMAP catalog (Chen+, 2008) J/ApJS/171/61 : All-Sky Survey of Flat-Spectrum Radio Sources (Healey+, 2007) J/ApJS/148/97 : The WMAP First Year Source Catalog (WMAP1) (Bennett+, 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of right ascension (J2000) 4- 5 I2 min RAm Minute of right ascension (J2000) 7- 8 I2 s RAs Second of right ascension (J2000) 10 A1 --- DE- Declination sign (J2000) 11- 12 I2 deg DEd Degree of declination (J2000) 14- 15 I2 arcmin DEm Arcminute of declination (J2000) 17- 26 A10 --- WMAP WMAP 5-yr name (JHHMM-DDMM) if available (Wright et al., Cat. J/ApJS/180/283) 28- 33 A6 --- OType Object type (G, GPair, GTripl, RadioS or QSO) 35- 38 F4.1 Jy S(Q) WMAP Q channel (41GHz) flux density 40- 42 F3.1 Jy e_S(Q) 1σ error in S(Q) 44- 47 F4.1 Jy S(V) WMAP V channel (61GHz) flux density 49- 51 F3.1 Jy e_S(V) 1σ error in S(V) 53- 56 F4.1 Jy S(W) WMAP W channel (94GHz) flux density 58- 60 F3.1 Jy e_S(W) 1σ error in S(W) 62- 75 A14 --- 5GHzID 5GHz identification (1) 77- 80 F4.1 arcmin Dist Angular distance to the 5GHz counterpart 82- 86 A5 --- Note [a-e ] Note(s) (2)
Note (1): As given in the following catalogs: GB6 = Gregory et al. 1996, Cat. VIII/40 PMN = Griffith et al. 1994, 1995, Wright et al. 1994, 1996: Cat. VIII/38 S5 = Kuehr et al. 1981AJ.....86..854K or 1981, Cat. VIII/5 Note (2): Notes as follows: a = The source position is fitted to the local maximum of a 5x5 pixel grid as there are two bright pixels within the Q-band beam, both of which are the brightest in their 3x3 pixel neighborhood. b = Indicates this source is included in the CRATES catalog (8.4GHz; Healey et al. 2007, Cat. J/ApJS/171/61). c = Indicates this source is included in the AT20G BSS catalog (Australia Telescope 20GHz Survey; Massardi et al. 2008, Cat. J/MNRAS/384/775). d = Indicates the source is in the three-year WMAP point source catalog (Cat. J/A+A/508/107), but not in the five-year catalog. e = Based on the SEDs of the 5GHz sources, this source has a different 5GHz identification than noted in the WMAP five-year point source catalog.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of right ascension (J2000) 4- 5 I2 min RAm Minute of right ascension (J2000) 7- 8 I2 s RAs Second of right ascension (J2000) 10 A1 --- DE- Declination sign (J2000) 11- 12 I2 deg DEd Degree of declination (J2000) 14- 15 I2 arcmin DEm Arcminute of declination (J2000) 17- 20 F4.1 Jy S(Q) WMAP Q channel (41GHz) radio flux density 22- 24 F3.1 Jy e_S(Q) 1σ error in S(Q) 26- 29 F4.1 Jy S(V) WMAP V channel (61GHz) radio flux density 31- 33 F3.1 Jy e_S(V) 1σ error in S(V) 35- 38 F4.1 Jy S(W) WMAP W channel (94GHz) radio flux density 40- 42 F3.1 Jy e_S(W) 1σ error in S(W) 44- 63 A20 --- ID? Possible radio companion (1) 65- 68 F4.1 arcmin Dist Angular distance to the radio source 70- 74 F5.3 Jy Flux Flux density of the possible companion (2) 76 A1 --- Note [cd] Note (3)
Note (1): The 5GHz radio source within 15' of our source position is given. When a 5GHz ID is not available, the closest source from NVSS and SUMSS survey is given. Note (2): The corresponding flux density of the possible radio companion at 4.85GHz for PMN and GB6 sources, 1.4GHz for NVSS sources, and 0.843GHz for SUMSS sources. Note (3): Note as follows: c = This source is in the CRATES catalog (Healey et al. 2007, Cat. J/ApJS/171/61), with an 8.4GHz flux measured at 0.074Jy. d = There are two pixels within one Q-band beam, both of which are the brightest in their 3x3 pixel neighborhood. The location showing here is fitted to the local maximum of a 5x5 pixel neighborhood including both bright sources.
Nomenclature Notes: Objects are <[CW2009b] WMAP JHHMMSS+DDMM> in Simbad. History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 18-Mar-2011
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