2004ApJ...604..125B


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET14:50:20

2004ApJ...604..125B - Astrophys. J., 604, 125-140 (2004/March-3)

Molecular gas in the lensed Lyman break galaxy cB58.

BAKER A.J., TACCONI L.J., GENZEL R., LEHNERT M.D. and LUTZ D.

Abstract (from CDS):

We have used the IRAM Plateau de Bure Interferometer to map CO (3-2) emission from the gravitationally lensed Lyman break galaxy MS 1512-cB58. This is the first detection of a molecular emission line in any Lyman break system; its integrated intensity implies a total molecular gas mass of (6.6+5.8–4.3)x109 h–20.7M, while its width implies a dynamical mass of (1.0+0.6–0.4)x1010csc\ul 2i h–10.7M(for a flat ΩΛ=0.7 cosmology). These estimates are in excellent concordance with nearly all parameters of the system measured at other wavelengths and yield a consistent picture of past and future star formation with no obvious discrepancies requiring explanation by differential lensing. In particular, we find that the age and remaining lifetime of the current episode of star formation are likely to be similar, the surface densities of star formation and molecular gas mass are related by a Schmidt law, and the fraction of baryonic mass already converted into stars is sufficient to account for the observed enrichment of the interstellar medium to 0.4 Z. Barring substantial gas inflow or a major merger, the stars forming in the current episode will have mass and coevality at z=0 similar to those of a spiral bulge. Assuming that cB58 is a typical Lyman break galaxy apart from its magnification, its global parameters suggest that the prescriptions for star formation used in some semianalytic models of galaxy evolution require moderate revision, although the general prediction that gas mass fraction should increase with redshift is validated. The length of cB58's star formation episode relative to the time elapsed over the redshift range 2.5≤z≤3.5 strongly argues against scenarios in which observed LBGs cohabit their halos with a large number of similar but ``dormant'' systems whose starbursts have faded or not yet begun. As a useful empirical result, we find that the observed line/continuum ratio for cB58 is similar to those of high-redshift systems with quite different dust luminosities and nuclear activity levels. Finally, we report the detection of a second source close to the position of the cD elliptical in the z=0.37 lensing cluster, which may be nonthermal continuum emission from the cD or CO line emission from a hitherto unknown background galaxy at z∼1.48 or ∼2.73.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Galaxies: Evolution - Galaxies: ISM - Galaxies: Kinematics and Dynamics - Galaxies: Starburst

Nomenclature: Table 1: [BTG2004] A (No. X).

CDS comments: Table 1: PPP NNNNNN = CNOC MS 1512 NNNNNN in S. Parag. 4.1: Westphal-MD11 = Westphal MMD11 in S.

Simbad objects: 21

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Number of rows : 21

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 NGC 278 H2G 00 52 04.3422973787 +47 33 01.649350749   10.5       ~ 221 1
2 NAME SMM J02399-0136 G 02 39 51.87 -01 35 58.8       21.20   ~ 178 2
3 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 960 0
4 [VV96] J102434.5+470911 Sy1 10 24 34.5 +47 09 11     20.5     ~ 475 0
5 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5369 1
6 LBQS 1230+1627 QSO 12 33 10.4336062991 +16 10 52.996999458     17.8     ~ 35 0
7 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 982 2
8 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3851 4
9 NAME SMM J14011+0252 GiC 14 01 04.95 +02 52 24.0           ~ 152 1
10 QSO B1408+5642 QSO 14 09 55.5654159383 +56 28 26.429306318   17.56 17.30     ~ 48 0
11 QSO J1415+1129 QSO 14 15 46.25 +11 29 43.4   17.63 17.23     ~ 600 1
12 NAME SMM J141809.8+522205 G 14 18 09.73 +52 22 01.3           ~ 27 0
13 ICRF J150609.5+373051 Sy2 15 06 09.52996778 +37 30 51.1325044   21.2 21.2 20.60   ~ 155 1
14 ClG J1514+3636 ClG 15 14 22.0 +36 36 22     19.0     ~ 136 0
15 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 318 0
16 [BTG2004] X mm 15 14 22.455 +36 36 20.90           ~ 1 0
17 CNOC MS 1512 101094 G 15 14 22.482 +36 36 21.08           ~ 146 1
18 CNOC MS 1512 101068 GiC 15 14 22.578 +36 36 16.80           ~ 2 0
19 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1564 2
20 6C 171301+501842 Sy2 17 14 14.8 +50 15 31   24.05   22.64   ~ 107 1
21 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 710 0

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2020.12.02-14:50:20

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