2007ApJ...669..929L


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST20:10:58

2007ApJ...669..929L - Astrophys. J., 669, 929-946 (2007/November-2)

Integral field spectroscopy of high-redshift star-forming galaxies with laser-guided adaptive optics: evidence for dispersion-dominated kinematics.

LAW D.R., STEIDEL C.C., ERB D.K., LARKIN J.E., PETTINI M., SHAPLEY A.E. and WRIGHT S.A.

Abstract (from CDS):

We present early results from an ongoing study of the kinematic structure of star-forming galaxies at redshift z∼2-3 using integral-field spectroscopy of rest-frame optical nebular emission lines in combination with Keck laser guide star adaptive optics (LGSAO). We show kinematic maps of three target galaxies Q1623-BX453, Q0449-BX93, and DSF 2237a-C2 located at redshifts z=2.1820, 2.0067, and 3.3172, respectively, each of which is well resolved with a PSF measuring approximately 0.11"-0.15" (∼900-1200 pc at z∼2-3) after cosmetic smoothing. Neither galaxy at z∼2 exhibits substantial kinematic structure on scales ≳30 km/s; both are instead consistent with largely dispersion-dominated velocity fields with σ∼80 km/s along any given line of sight into the galaxy. In contrast, DSF 2237a-C2 presents a well-resolved gradient in velocity over a distance of ∼4 kpc with peak-to-peak amplitude of 140 km/s. It is unlikely that DSF 2237a-C2 represents a dynamically cold rotating disk of ionized gas as the local velocity dispersion of the galaxy (σ=79 km/s) is comparable to the observed shear. While some gas cooling models reproduce the observed kinematics better than a simple rotating disk model, even these provide a poor overall description of the target galaxies, suggesting that our current understanding of gas cooling mechanisms in galaxies in the early universe is (at best) incomplete.

Abstract Copyright:

Journal keyword(s): Galaxies: High-Redshift - Galaxies: Kinematics and Dynamics - Galaxies: Starburst

Nomenclature: Table 1: [ESS2003] Q0449-BXNN (No. BX93) added.

Simbad objects: 11

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Number of rows : 11

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 QSO B0449-1645 QSO 04 52 14.2528978554 -16 40 16.384924982   18.0 17.0 17.8   ~ 41 1
2 [ESS2003] Q0449-BX93 G 04 52 15.417 -16 40 56.88           ~ 3 0
3 Mrk 273 Sy2 13 44 42.164 +55 53 13.53   15.68 14.91     ~ 840 3
4 NAME MS 1512-cB58 AGN 15 14 22.2751 +36 36 25.674     20.64   20.35 ~ 318 0
5 CNOC MS 1512 101094 G 15 14 22.482 +36 36 21.08           ~ 146 1
6 2MASX J15265942+3558372 LIN 15 26 59.442 +35 58 37.01   15.61       ~ 248 1
7 [ESS2003] Q1623-BX453 G 16 25 50.84 +26 49 31.4           ~ 10 0
8 [ESS2003] Q1700-BX691 G 17 01 05.99 +64 12 10.3           ~ 19 0
9 SAS-LBG DSF2237a-C2 G 22 40 08.29 +11 49 04.8           ~ 19 0
10 [ESS2003] Q2343-BM133 G 23 46 16.18 +12 48 09.3           ~ 7 0
11 NAME BzK 15504 G ~ ~           ~ 25 0

    Equat.    Gal    SGal    Ecl

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