2013A&A...559L...9B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:25:01

2013A&A...559L...9B - Astronomy and Astrophysics, volume 559, L9-9 (2013/11-1)

CLASH-VLT: spectroscopic confirmation of a z = 6.11 quintuply lensed galaxy in the Frontier Fields cluster RXC J2248.7-4431.

BALESTRA I., VANZELLA E., ROSATI P., MONNA A., GRILLO C., NONINO M., MERCURIO A., BIVIANO A., BRADLEY L., COE D., FRITZ A., POSTMAN M., SEITZ S., SCODEGGIO M., TOZZI P., ZHENG W., ZIEGLER B., ZITRIN A., ANNUNZIATELLA M., BARTELMANN M., BENITEZ N., BROADHURST T., BOUWENS R., CZOSKE O., DONAHUE M., FORD H., GIRARDI M., INFANTE L., JOUVEL S., KELSON D., KOEKEMOER A., KUCHNER U., LEMZE D., LOMBARDI M., MAIER C., MEDEZINSKI E., MELCHIOR P., MENEGHETTI M., MERTEN J., MOLINO A., MOUSTAKAS L., PRESOTTO V., SMIT R. and UMETSU K.

Abstract (from CDS):

We present VIsible Multi-Object Spectrograph (VIMOS) observations of a z∼6 galaxy quintuply imaged by the Frontier Fields galaxy cluster RXC J2248.7-4431 (z=0.348). This sub-L*, high-z galaxy has been recently discovered by REF??mon13?? using dropout techniques with the 16-band HST photometry acquired as part of the Cluster Lensing And Supernova survey with Hubble (CLASH). Obtained as part of the CLASH-VLT survey, the VIMOS medium-resolution spectra of this source show a very faint continuum between ∼8700Å and ∼9300Å and a prominent emission line at 8643Å, which can be readily identified with Lyman-α at z=6.110±0.002. The emission line exhibits an asymmetric profile, with a more pronounced red wing. The rest-frame equivalent width of the line is EW=79±10Å, relatively well constrained thanks to the detection of the UV continuum, which is rarely achieved for a sub-L* galaxy at this redshift. After correcting for magnification, the star formation rate (SFR) estimated from the Lyα line is SFR(Lyα)=11M/yr and that estimated from the UV data is SFR(UV)=3M/yr. We estimate that the effective radius of the source is Re≲0.4kpc, which implies a star formation surface mass density ΣSFR>6M/yr/kpc2 and, using the Kennicutt-Schmidt relation, a gas surface mass density Σgas>103M/pc2. Our results support the idea that this magnified, distant galaxy is a young and compact object with luminosity 0.4L* at z=6, when the Universe was just 1Gyr old, with a similar amount of mass in gas and stars. In the spirit of the Frontier Fields initiative, we also publish the redshifts of several multiply imaged sources and other background objects, which will help improving the strong-lensing model of this galaxy cluster.

Abstract Copyright:

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

Nomenclature: Table 1: [BVR2013] JHHMMSS.ss+DDMMSS.s N=15.

Errata: erratum vol. 611, art. C2 (2018)

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 439 1
2 [BVR2013] J224839.02-443234.6 LeI 22 48 39.02 -44 32 34.6           ~ 1 0
3 [MSG2014] 14d LeG 22 48 41.110 -44 31 11.41         27.4 ~ 11 0
4 [BVR2013] J224841.38-443228.4 LeI 22 48 41.407 -44 32 28.61           ~ 3 0
5 [BVR2013] J224844.56-443223.9 LeG 22 48 41.554 -44 32 23.99         25.54 ~ 13 0
6 [BVR2013] J224843.01-443124.9 LeG 22 48 43.013 -44 31 24.91         23.81 ~ 9 0
7 [MSG2014] 14b LeG 22 48 43.450 -44 32 04.66         26.4 ~ 12 0
8 [MSG2014] Lensed G G 22 48 44.1 -44 31 51           ~ 3 0
9 [MSG2014] 14e LeG 22 48 44.16 -44 31 53.7           ~ 5 0
10 [BVR2013] J224844.23-443131.0 LeI 22 48 44.23 -44 31 31.0           ~ 2 0
11 [RJL2014] AS1063 1.3 LeG 22 48 44.731 -44 31 16.07           ~ 6 0
12 [MSG2014] 4b LeG 22 48 45.084 -44 31 38.30         22.65 ~ 8 0
13 [JSB2014] AS1063 6.3 LeG 22 48 45.226 -44 32 23.99         22.59 ~ 9 0
14 [MSG2014] 14a LeG 22 48 45.810 -44 32 14.86         25.9 ~ 19 0
15 [BVR2013] J224846.92-443249.4 LeI 22 48 46.9220 -44 32 49.305           ~ 2 0
16 [MSG2014] 1a LeG 22 48 47.020 -44 31 44.27           ~ 6 0
17 [BVR2013] J224849.28-443055.8 LeI 22 48 49.2789 -44 30 55.725           ~ 2 0
18 ACO S 1063 ClG 22 48 54.3 -44 31 07           ~ 205 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:25:01

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