2011A&A...535A..38I


Query : 2011A&A...535A..38I

2011A&A...535A..38I - Astronomy and Astrophysics, volume 535A, 38-38 (2011/11-1)

Deep low-frequency radio observations of the NOAO Bootes field. I. Data reduction and catalog construction.

INTEMA H.T., VAN WEEREN R.J., ROETTGERING H.J.A. and LAL D.V.

Abstract (from CDS):

In this article we present deep, high-resolution radio interferometric observations at 153 MHz to complement the extensively studied NOAO Bootes field. We provide a description of the observations, data reduction and source catalog construction. From our single pointing GMRT observation of ∼12h we obtain a high-resolution (26''x22'') image of ∼11.3 square degrees, fully covering the Bootes field region and beyond. The image has a central noise level of ∼1.0mJy/beam, which rises to 2.0-2.5mJy/beam at the field edge, placing it amongst the deepest ∼150MHz surveys to date. The catalog of 598 extracted sources is estimated to be ∼92 percent complete for >10mJy sources, while the estimated contamination with false detections is <1 percent. The low rms position uncertainty of 1.24'' facilitates accurate matching against catalogs at optical, infrared and other wavelengths. Differential source counts are determined down to ≲10mJy. There is no evidence for flattening of the counts towards lower flux densities as observed in deep radio surveys at higher frequencies, suggesting that our catalog is dominated by the classical radio-loud AGN population that explains the counts at higher flux densities. Combination with available deep 1.4GHz observations yields an accurate determination of spectral indices for 417 sources down to the lowest 153MHz flux densities, of which 16 have ultra-steep spectra with spectral indices below -1.3. We confirm that flattening of the median spectral index towards low flux densities also occurs at this frequency. The detection fraction of the radio sources in NIR KS-band is found to drop with radio spectral index, which is in agreement with the known correlation between spectral index and redshift for brighter radio sources.

Abstract Copyright:

Journal keyword(s): surveys - galaxies: active - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/A+A/535/A38): table3.dat>

Nomenclature: Table 3: [IVR2011] JHHMMSS+DDMMSS N=598.

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1760 1
2 [DVR2000] TN J0924-2201 rG 09 24 19.94 -22 01 42.2       25.850   ~ 80 0
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3912 2
4 3C 295 Sy2 14 11 20.467 +52 12 09.52   22.34 20.80 18.54   ~ 920 5
5 [CVB2008] Source A rG 14 26 31.75 +34 15 57.5   27.60   25.06 22.50 ~ 3 0
6 [DMR2002] J142647+345851 rG 14 26 47.87 +34 58 51.0   28.25   25.91 27.87 ~ 2 0
7 [DVR2000] WN J1426+3522 Rad 14 26 56.32 +35 22 34.7           ~ 2 0
8 [DMR2002] J142719+352326 Rad 14 27 19.32 +35 23 29.2           ~ 1 0
9 [DMR2002] J142724+334714 Rad 14 27 24.77 +33 47 18.5           ~ 1 0
10 [CVB2008] Source C rG 14 27 41.84 +34 23 24.7   26.70   25.32 24.40 ~ 2 0
11 [DMR2002] J142954+343516 Rad 14 29 53.90 +34 35 18.8           ~ 1 0
12 [DMR2002] J143118+351549 Rad 14 31 18.29 +35 15 49.5           ~ 1 0
13 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 349 0
14 [DMR2002] J143230+343449 QSO 14 32 30.586 +34 34 50.36       21.07 20.20 ~ 3 0
15 [DMR2002] J143249+343915 Rad 14 32 49.12 +34 39 14.0           ~ 1 0
16 [DMR2002] J143258+342055 rG 14 32 58.44 +34 20 55.4   26.37   25.73 24.48 ~ 2 0
17 [DMR2002] J143310+333131 Rad 14 33 10.42 +33 31 27.7           ~ 1 0
18 [DMR2002] J143331+341012 Rad 14 33 31.84 +34 10 12.9           ~ 1 0
19 [DMR2002] J143500+342531 Rad 14 35 00.98 +34 25 30.2           ~ 1 0
20 [DMR2002] J143506+350059 Rad 14 35 06.89 +35 00 58.2           ~ 1 0
21 [DMR2002] J143520+345950 Rad 14 35 20.51 +34 59 49.1           ~ 1 0
22 [DMR2002] J143538+335347 Rad 14 35 38.76 +33 53 44.2           ~ 1 0
23 [DMR2002] J143700+335920 Rad 14 37 00.74 +33 59 20.2           ~ 1 0
24 [DMR2002] J143815+344428 Rad 14 38 15.28 +34 44 29.8           ~ 1 0

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2021.09.26-14:09:34

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