Planetary nebulae in the (extra)-galactic context: Probing chemical evolution in star-forming galaxies

2018 ◽  
Vol 14 (S343) ◽  
pp. 174-180
Author(s):  
Letizia Stanghellini
Keyword(s):  
Galaxy Formation ◽  
Planetary Nebulae ◽  
H Ii Regions ◽  
Chemical Abundances ◽  
Star Forming ◽  
Galaxy Formation And Evolution ◽  
Formation History ◽  
Chemical Content ◽  
Formation And Evolution ◽  
Powerful Constraint

AbstractThe populations of planetary nebulae (PNe) probe metallicity and chemical content (and its evolution) of the parent galaxy, giving clues to galaxy formation and evolution. This sub-field of extra-galactic PN research has been particularly active in the recent years. Comparison of data and models yielded estimates of global cosmic enrichment and provided constraints to galaxy formation history. In external spiral galaxies, the chemical contents of PNe and H II regions can be compared to disclose possible evolution of the radial metallicity gradient, which is, in turn, a powerful constraint to galactic chemical evolutionary models. In the Milky Way, recent PN progenitor dating and new chemical abundances offer an updated look into our own Galaxy. Collectively, Galactic and extra-galactic radial metallicity gradients from emission-line probes (PNe and H II regions) can be compared to have a cosmological outlook on galactic evolution.

scholarly journals The influence of massive stars on the interstellar medium

1999 ◽  
Vol 193 ◽  
pp. 627-635
Author(s):  
M. Sally Oey
Keyword(s):  
Galaxy Formation ◽  
Massive Stars ◽  
Stellar Winds ◽  
H Ii Regions ◽  
Feedback Effects ◽  
Star Forming ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
The Relationship ◽  
Warm Ionized Medium

On scales ranging from pcs to kpcs, the relationship between stellar and gaseous galactic components forms the basis for interpreting observations of galaxies and understanding galaxy formation and evolution. Feedback effects from massive stars dominate the structure, ionization, kinematics, and enrichment of the gaseous ISM in star-forming galaxies. On galactic scales, the ionizing radiation from these stars creates populations of H II regions and the diffuse, warm ionized medium. Likewise, superbubbles created by stellar winds and supernovae strongly influence the structure, kinematics, and balance of the multiphase ISM. This contribution reviews these feedback effects of massive stars on the global ISM.

scholarly journals Extended halos and intracluster light using Planetary Nebulae as tracers in nearby clusters

2015 ◽  
Vol 11 (A29B) ◽  
pp. 5-10
Author(s):  
Magda Arnaboldi
Keyword(s):  
Spatial Distribution ◽  
Galaxy Formation ◽  
Near Field ◽  
Planetary Nebulae ◽  
Diffuse Light ◽  
Galaxy Formation And Evolution ◽  
Radial Extent ◽  
Formation And Evolution ◽  
Cluster Cores ◽  
Intracluster Light

AbstractSince the first detection of intracluster planetary nebulae in 1996, imaging and spectroscopic surveys identified such stars to trace the radial extent and the kinematics of diffuse light in clusters. This topic of research is tightly linked with the studies of galaxy formation and evolution in dense environment, as the spatial distribution and kinematics of planetary nebulae in the outermost regions of galaxies and in the cluster cores is relevant for setting constraints on cosmological simulations. In this sense, extragalactic planetary nebulae play a very important role in the near-field cosmology, in order to measure the integrated mass as function of radius and the orbital distribution of stars in structures placed in the densest regions of the nearby universe.

scholarly journals Characterisation of the Galactic thick disk

2013 ◽  
Vol 9 (S298) ◽  
pp. 17-27
Author(s):  
Thomas Bensby
Keyword(s):  
Galaxy Formation ◽  
Milky Way ◽  
Spiral Galaxies ◽  
Thin Disk ◽  
Thick Disk ◽  
Host Galaxy ◽  
Galaxy Formation And Evolution ◽  
Formation History ◽  
History Of ◽  
Formation And Evolution

AbstractThick disks appear to be common in external large spiral galaxies and our own Milky Way also hosts one. The existence of a thick disk is possibly directly linked to the formation history of the host galaxy and if its properties is known it can constrain models of galaxy formation and help us to better understand galaxy formation and evolution. This brief review attempts to highlight some of the characteristics of the Galactic thick disk and how it relates to other stellar populations such as the thin disk and the Galactic bulge. Focus has been put on results from high-resolution spectroscopic data obtained during the last 10 to 15 years.

scholarly journals A Review of the Theory of Galactic Winds Driven by Stellar Feedback

Galaxies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 114 ◽  
Author(s):  
Dong Zhang
Keyword(s):  
Galaxy Formation ◽  
Mass Function ◽  
Future Research ◽  
Star Forming ◽  
Stellar Feedback ◽  
Galactic Winds ◽  
Galaxy Formation And Evolution ◽  
Supernova Explosions ◽  
Formation And Evolution ◽  
Magnetohydrodynamic Simulations

Galactic winds from star-forming galaxies are crucial to the process of galaxy formation and evolution, regulating star formation, shaping the stellar mass function and the mass-metallicity relation, and enriching the intergalactic medium with metals. Galactic winds associated with stellar feedback may be driven by overlapping supernova explosions, radiation pressure of starlight on dust grains, and cosmic rays. Galactic winds are multiphase, the growing observations of emission and absorption of cold molecular, cool atomic, ionized warm and hot outflowing gas in a large number of galaxies have not been completely understood. In this review article, I summarize the possible mechanisms associated with stars to launch galactic winds, and review the multidimensional hydrodynamic, radiation hydrodynamic and magnetohydrodynamic simulations of winds based on various algorithms. I also briefly discuss the theoretical challenges and possible future research directions.

scholarly journals Dust reddening in star-forming galaxies

2012 ◽  
Vol 8 (S292) ◽  
pp. 291-291
Author(s):  
Ting Xiao ◽  
Tinggui Wang ◽  
Huiyuan Wang ◽  
Hongyan Zhou ◽  
Honglin Lu ◽  
...  
Keyword(s):  
Star Formation ◽  
Gas Phase ◽  
Galaxy Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Analytical Models ◽  
Star Forming ◽  
Crucial Component ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution

AbstractDust is a crucial component of galaxies in modifying the observed properties of galaxies. Previous studies have suggested that dust reddening in star-forming galaxies is correlated with star formation rate (SFR), luminosity, gas-phase metallicity (Z), stellar mass (M*) and inclination. In this work we investigate the fundamental relations between dust reddening and physical properties of galaxies, and obtain a well-defined empirical recipe for dust reddening. The empirical formulae can be incorporated into semi-analytical models of galaxy formation and evolution to estimate the dust reddening and facilitate comparison with observations.

scholarly journals Panchromatic radiation from galaxies as a probe of galaxy formation and evolution

2011 ◽  
Vol 7 (S284) ◽  
pp. 446-455 ◽  
Author(s):  
Michael Rowan-Robinson
Keyword(s):  
Star Formation ◽  
Galaxy Formation ◽  
High Redshift ◽  
Star Formation History ◽  
Spherically Symmetric ◽  
3 Dimensional ◽  
Dust Extinction ◽  
Galaxy Formation And Evolution ◽  
Formation History ◽  
Formation And Evolution

AbstractI review work on modelling the infrared and submillimetre SEDs of galaxies. The underlying physical assumptions are discussed and spherically symmetric, axisymmetric, and 3-dimensional radiative transfer codes are reviewed. Models for galaxies with Spitzer IRS data and for galaxies in the Herschel-Hermes survey are discussed. Searches for high redshift infrared and submillimetre galaxies, the star formation history, the evolution of dust extinction, and constraints from source-counts, are briefly discussed.

scholarly journals Radio-loud AGN in the first LoTSS data release

2019 ◽  
Vol 622 ◽  
pp. A12 ◽  
Author(s):  
M. J. Hardcastle ◽  
W. L. Williams ◽  
P. N. Best ◽  
J. H. Croston ◽  
K. J. Duncan ◽  
...  
Keyword(s):  
Galaxy Formation ◽  
Galactic Nuclei ◽  
Lifetime Distribution ◽  
Analytical Models ◽  
Jet Physics ◽  
Star Forming ◽  
Galaxy Formation And Evolution ◽  
Sky Survey ◽  
Formation And Evolution ◽  
Good Agreement

We constructed a sample of 23 344 radio-loud active galactic nuclei (RLAGN) from the catalogue derived from the LOFAR Two-Metre Sky Survey (LoTSS) survey of the HETDEX Spring field. Although separating AGN from star-forming galaxies remains challenging, the combination of spectroscopic and photometric techniques we used gives us one of the largest available samples of candidate RLAGN. We used the sample, combined with recently developed analytical models, to investigate the lifetime distribution of RLAGN. We show that large or giant powerful RLAGN are probably the old tail of the general RLAGN population, but that the low-luminosity RLAGN candidates in our sample, many of which have sizes < 100 kpc, either require a very different lifetime distribution or have different jet physics from the more powerful objects. We then used analytical models to develop a method of estimating jet kinetic powers for our candidate objects and constructed a jet kinetic luminosity function based on these estimates. These values can be compared to observational quantities, such as the integrated radiative luminosity of groups and clusters, and to the predictions from models of RLAGN feedback in galaxy formation and evolution. In particular, we show that RLAGN in the local Universe are able to supply all the energy required per comoving unit volume to counterbalance X-ray radiative losses from groups and clusters and thus prevent the hot gas from cooling. Our computation of the kinetic luminosity density of local RLAGN is in good agreement with other recent observational estimates and with models of galaxy formation.

scholarly journals Extended halos and intracluster light using Planetary Nebulae as tracers in nearby clusters

2015 ◽  
Vol 11 (A29B) ◽  
Author(s):  
Magda Arnaboldi
Keyword(s):  
Spatial Distribution ◽  
Galaxy Formation ◽  
Near Field ◽  
Planetary Nebulae ◽  
Diffuse Light ◽  
Galaxy Formation And Evolution ◽  
Radial Extent ◽  
Formation And Evolution ◽  
Cluster Cores ◽  
Intracluster Light

AbstractSince the first detection of intracluster planetary nebulae in 1996, imaging and spectroscopic surveys identified such stars to trace the radial extent and the kinematics of diffuse light in clusters. This topic of research is tightly linked with the studies of galaxy formation and evolution in dense environment, as the spatial distribution and kinematics of planetary nebulae in the outermost regions of galaxies and in the cluster cores is relevant for setting constraints on cosmological simulations. In this sense, extragalactic planetary nebulae play a very important role in the near-field cosmology, in order to measure the integrated mass as function of radius and the orbital distribution of stars in structures placed in the densest regions of the nearby universe.

scholarly journals Euclid: the selection of quiescent and star-forming galaxies using observed colours

2020 ◽  
Vol 494 (2) ◽  
pp. 2337-2354
Author(s):  
L Bisigello ◽  
U Kuchner ◽  
C J Conselice ◽  
S Andreon ◽  
M Bolzonella ◽  
...  
Keyword(s):  
Galaxy Formation ◽  
Rest Frame ◽  
Star Forming ◽  
Galaxy Formation And Evolution ◽  
Formation And Evolution ◽  
Selection Of ◽  
Key Questions

ABSTRACT The Euclid mission will observe well over a billion galaxies out to z ∼ 6 and beyond. This will offer an unrivalled opportunity to investigate several key questions for understanding galaxy formation and evolution. The first step for many of these studies will be the selection of a sample of quiescent and star-forming galaxies, as is often done in the literature by using well-known colour techniques such as the ‘UVJ’ diagram. However, given the limited number of filters available for the Euclid telescope, the recovery of such rest-frame colours will be challenging. We therefore investigate the use of observed Euclid colours, on their own and together with ground-based u-band observations, for selecting quiescent and star-forming galaxies. The most efficient colour combination, among the ones tested in this work, consists of the (u − VIS) and (VIS − J) colours. We find that this combination allows users to select a sample of quiescent galaxies complete to above $\sim 70{{\ \rm per\ cent}}$ and with less than 15${{\ \rm per\ cent}}$ contamination at redshifts in the range 0.75 &lt; z &lt; 1. For galaxies at high-z or without the u-band complementary observations, the (VIS − Y) and (J − H) colours represent a valid alternative, with $\gt 65{{\ \rm per\ cent}}$ completeness level and contamination below 20${{\ \rm per\ cent}}$ at 1 &lt; z &lt; 2 for finding quiescent galaxies. In comparison, the sample of quiescent galaxies selected with the traditional UVJ technique is only $\sim 20{{\ \rm per\ cent}}$ complete at z &lt; 3, when recovering the rest-frame colours using mock Euclid observations. This shows that our new methodology is the most suitable one when only Euclid bands, along with u-band imaging, are available.

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