2010A&A...524A..79V


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.19CEST05:06:14

2010A&A...524A..79V - Astronomy and Astrophysics, volume 524, A79-79 (2010/12-1)

Very Large Array observations of the 8 o'clock arc lens system: radio emission and a limit on the star-formation rate.

VOLINO F., WUCKNITZ O., McKEAN J.P. and GARRETT M.A.

Abstract (from CDS):

The 8 o'clock arc is a gravitationally lensed Lyman break galaxy (LBG) at redshift z=2.73 that has a star-formation rate (SFR) of ∼270M/yr (derived from optical and near-infrared spectroscopy). Taking the magnification of the system (∼12) and the SFR into account, the expected flux density of any associated radio emission at 1.4GHz is predicted to be just 0.1mJy. However, the lens system is found to be coincident with a radio source detected in the NRAO Very Large Array (VLA) Sky Survey with a flux density of ∼5mJy. If this flux density is attributed to the lensed LBG then it would imply a SFR∼11000M/yr, in contrast with the optical and near-infrared derived value. We want to investigate the radio properties of this system, and independently determine the SFR for the LBG from its lensed radio emission. We have carried out new high resolution imaging with the VLA ain A and B-configurations at 1.4 and 5GHz. We find that the radio emission is dominated by a radio-loud AGN associated with the lensing galaxy. The radio-jet from the AGN partially covers the lensed arc of the LBG, and we do not detect any radio emission from the unobscured region of the arc down to a 3σ flux-density limit of 108µJy/beam. Using the radio data, we place a limit of ≤750M/yr for the SFR of the LBG, which is consistent with the results from the optical and near-infrared spectroscopy. We expect that the sensitivity of the Expanded VLA will be sufficient to detect many high redshift LBGs that are gravitationally lensed after only a few hours of observing time. The high angular resolution provided by the EVLA will also allow detailed studies of the lensed galaxies and determine if there is radio emission from the lens.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - gravitational lensing: strong

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 PHL 6352 QSO 00 10 33.99063132 +17 24 18.7613217   17.1 18.0 16.7   ~ 88 1
2 NAME 8 O'Clock Arc blu 00 22 40.77984 +14 31 13.9548           ~ 57 0
3 [ATL2007] A1 LeI 00 22 40.79 +14 31 13.8           ~ 7 0
4 [ATL2007] LRG BiC 00 22 40.918 +14 31 10.43           ~ 11 0
5 [ATL2007] A2 LeI 00 22 40.97 +14 31 14.0           ~ 8 0
6 [ATL2007] A3 LeI 00 22 41.15 +14 31 12.6           ~ 8 0
7 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2420 2
8 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 1850 0
9 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 315 0
10 GB6 J2047+2643 Rad 20 47 +26.7           ~ 99 1
11 GB6 B2108+2118 gLS 21 10 53.30 +21 31 09.0           ~ 26 0
12 NAME Cosmic Eye G 21 35 12.730 -01 01 42.90           ~ 76 0

    Equat.    Gal    SGal    Ecl

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2019.09.19-05:06:14

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