2012A&A...543A..62J


Query : 2012A&A...543A..62J

2012A&A...543A..62J - Astronomy and Astrophysics, volume 543A, 62-62 (2012/7-1)

Molecular gas and dust in the highly magnified z~2.8 galaxy behind the Bullet Cluster.

JOHANSSON D., HORELLOU C., LOPEZ-CRUZ O., MULLER S., BIRKINSHAW M., BLACK J.H., BREMER M.N., WALL W.F., BERTOLDI F., CASTILLO E. and IBARRA-MEDEL H.J.

Abstract (from CDS):

The gravitational magnification provided by massive galaxy clusters makes it possible to probe the physical conditions in distant galaxies that are of lower luminosity than those in blank fields and likely more representative of the bulk of the high-redshift galaxy population. We aim to constrain the basic properties of molecular gas in a strongly magnified submm galaxy located behind the massive Bullet Cluster (1E 0657-56). This galaxy (SMMJ0658) is split into three images, with a total magnification factor of almost 100. We used the Australia Telescope Compact Array (ATCA) to search for 12CO(1-0) and 12CO(3-2) line emission from SMMJ0658. We also used the SABOCA bolometer camera on the Atacama Pathfinder EXperiment (APEX) telescope to measure the continuum emission at 350µm. CO(1-0) and CO(3-2) are detected at 6.8σ and 7.5σ significance when the spectra toward the two brightest images of the galaxy are combined. From the CO(1-0) luminosity we derive a mass of cold molecular gas of (1.8±0.3)x109M, using the CO to H2 conversion factor commonly used for luminous infrared galaxies. This is 45±25% of the stellar mass. From the width of the CO lines we derive a dynamical mass within the CO-emitting region L of (1.3±0.4)x1010(L/1kpc)M. We refine the redshift determination of SMMJ0658 to z=2.7793±0.0003. The CO(3-2) to CO(1-0) brightness temperature ratio is 0.56–0.15+0.21, which is similar to the values found in other star-forming galaxies. Continuum emission at 350µm from SMMJ0658 was detected with SABOCA at a signal-to-noise ratio of 3.6. The flux density is consistent with previous measurements at the same wavelength by the Herschel satellite and BLAST balloon-borne telescope. We study the spectral energy distribution of SMMJ0658 and derive a dust temperature of 33±5K and a dust mass of 1.1–0.3+0.8x107M. SMMJ0658 is one of the least massive submm galaxies discovered so far. As a likely representative of the bulk of the submm galaxy population, it is a prime target for future observations.

Abstract Copyright:

Journal keyword(s): submillimeter: galaxies - infrared: galaxies - cosmology: observations - 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 - 2023
#notes
1 QSO B0537-441 BLL 05 38 50.36155950 -44 05 08.9390233   15.77 16.48 16   ~ 850 2
2 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 903 1
3 [GCB2009] B LeG 06 58 37.1 -55 57 06           ~ 4 0
4 [JHS2010] 1 smm 06 58 37.31 -55 57 01.5           ~ 11 2
5 [GCB2009] A LeG 06 58 38.0 -55 57 02           ~ 4 1
6 2FGL J0727.0-4726 QSO 07 26 26.2402246992 -47 28 53.359592376       19.18   ~ 52 2
7 [VV96] J102434.5+470911 Sy1 10 24 34.5 +47 09 11     20.5     ~ 480 0
8 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 627 0
9 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 797 1
10 NAME SMM J16359+6613 G 16 35 55.62 +66 12 59.5           ~ 60 1
11 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 803 0
12 NAME Eyelash LeG 21 35 11.60 -01 02 52.0           ~ 214 0

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2023.02.02-20:06:36

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