2022A&A...666A.161B


Query : 2022A&A...666A.161B

2022A&A...666A.161B - Astronomy and Astrophysics, volume 666A, 161 (2022/10-1)

Spatially resolved gas and stellar kinematics in compact starburst galaxies.

BIK A., OSTLIN G., HAYES M., MELINDER J. and MENACHO V.

Abstract (from CDS):


Context. The kinematics of galaxies provide valuable insights into their physics and assembly history. Kinematics are governed not only by the gravitational potential, but also by merger events and stellar feedback processes such as stellar winds and supernova explosions.
Aims. We aim to identify what governs the kinematics in a sample of SDSS-selected nearby starburst galaxies, by obtaining spatially resolved measurements of the gas and stellar kinematics.
Methods. We obtained near-infrared integral-field K-band spectroscopy with VLT/SINFONI for 15 compact starburst galaxies. We derived the integrated as well as spatially resolved stellar and gas kinematics. The stellar kinematics were derived from the CO absorption bands, and Paα and Brγ emission lines were used for the gas kinematics.
Results. Based on the integrated spectra, we find that the majority of galaxies have gas and stellar velocity dispersion that are comparable. A spatially resolved comparison shows that the six galaxies that deviate show evidence for a bulge or stellar feedback. Two galaxies are identified as mergers based on their double-peaked emission lines. In our sample, we find a negative correlation between the ratio of the rotational velocity over the velocity dispersion (vrot/σ) and the star formation rate surface density.
Conclusions. We propose a scenario where the global kinematics of the galaxies are determined by gravitational instabilities that affect both the stars and gas. This process could be driven by mergers or accretion events. Effects of stellar feedback on the ionised gas are more localised and detected only in the spatially resolved analysis. The mass derived from the velocity dispersion provides a reliable mass even if the galaxy cannot be spatially resolved. The technique used in this paper is applicable to galaxies at low and high redshift with the next generation of infrared-focussed telescopes (JWST and ELT).

Abstract Copyright: © A. Bik et al. 2022

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: starburst - galaxies: ISM - infrared: galaxies - ISM: kinematics and dynamics - stars: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/666/A161): table1.dat list.dat fits/*>

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 SDSS J001809.16-090335.8 G 00 18 09.1715048064 -09 03 35.799160032           ~ 5 0
2 ESO 350-38 Sy2 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 381 0
3 2MASX J02300586-0720325 Sy1 02 30 05.867 -07 20 32.13   16.82   16.06   ~ 9 0
4 ESO 495-21 bCG 08 36 15.190 -26 24 33.66 12.04 11.93 11.45 11.09 12.3 ~ 573 3
5 Mrk 1303 Sy1 11 40 13.2338088216 -00 24 42.171461028   16.5   16.116   ~ 34 0
6 2MASX J11555922-0100011 Sy1 11 55 59.210 -01 00 00.98   17   15.97   ~ 20 0
7 FIRST J121114.3+142435 rG 12 11 14.3874200760 +14 24 35.219590020   16.69       ~ 22 0
8 Z 45-41 G 13 36 27.757 +07 48 58.50   15.6       ~ 13 0
9 2dFGRS TGN267Z032 Sy1 13 39 51.4703938800 -00 45 10.863418968   16.86 16.41 16.333   ~ 16 0
10 LEDA 3098309 G 13 40 49.0228393104 +06 16 54.755958864           ~ 5 0
11 FIRST J135356.1-023147 rG 13 53 56.1648950784 -02 31 47.385181380   16.637   15.746   ~ 11 0
12 NVSS J140009+040448 rG 14 00 09.000 +04 04 50.83   15.5       ~ 27 0
13 2dFGRS TGN275Z003 Sy1 14 12 24.8301480936 -00 49 55.795404936   16   15.823   ~ 25 0
14 Mrk 1396 G 15 13 36.3960842832 +04 31 45.417552456   16.5       ~ 15 0
15 NVSS J152527+050030 rG 15 25 27.486 +05 00 30.00           ~ 21 0
16 SDSS J154556.30+081459.3 G 15 45 56.2817378160 +08 15 00.123022836           ~ 6 0
17 ESO 338-4 EmG 19 27 58.338 -41 34 30.81   13.55 13.21 13.14 13.43 ~ 238 1
18 ESO 400-43 bCG 20 37 41.931 -35 29 07.94   14.26 14.34 13.93 13.96 ~ 50 2
19 2MASX J22560937+1305520 GiC 22 56 09.4261018464 +13 05 51.349938324   15.7 15.6     ~ 17 0

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