Activity and quiescence in galaxies at redshifts 1.4<z<3.5. The role of the starburst temperature
arXiv:1410.5048 · doi:10.1051/0004-6361/201423965
Abstract
We investigate 'activity' and 'quiescence' in galaxies at relatively high redshifts by modelling the line(and continuum) spectra of each object. The models account consistently for photoionization and shocks. We claim that the starburst effective temperature, the flux from an AGN, and the shock velocity are critical to activity. The results confirm that two sample galaxies show intense starburst activity with temperatures reaching Ts=2x10^5K and shock velocities Vs> 250 km/s, while for the remaining galaxies of our sample the models show quiescent star formation with Ts< 7x10^4K. A Seyfert 2 like AGN is proposed in one galaxy. The O/H relative abundances derived by the detailed modelling of the spectra are nearly solar for all the sample galaxies, in contrast to those obtained by direct methods.
arXiv comment5 pages, 3 figures, in press in A&A
References in corpus (13)
- Star Formation in Galaxies Along the Hubble Sequence
- An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
- AMAZE. I. The evolution of the mass-metallicity relation at z>3
- Spectroscopic Identification of Massive Galaxies at z~2.3 with Strongly Suppressed Star Formation
- Physical Properties of Emission-Line Galaxies at z ~ 2 from Near-Infrared Spectroscopy with Magellan FIRE
- Testing the Universality of the Fundamental Metallicity Relation at High Redshift Using Low-Mass Gravitationally Lensed Galaxies
- A grid of composite models for the simulation of the emission-line spectra from the NLR of active galaxies
- Gemini Near Infrared Spectrograph Observations of a Red Star Forming Galaxy at z=2.225: Evidence for Shock-Ionization due to a Galactic Wind
- Evidence of very low metallicity and high ionization state in a strongly lensed, star-forming dwarf galaxy at z=3.417
- A grid of Composite Models for the Simulation of Starburst Galaxy and HII Region Spectra
- Silicates in D-type symbiotic stars: an ISO overview
- Modelling galaxy spectra at redshifts 0.2<z<2.3 by the [OII]/Hb and [OIII]/Hb line ratios
- Distribution of the heavy elements throughout the extended narrow line region of the Seyfert galaxy NGC 7212