Local starburst galaxies and their descendants

Bergvall, Nils; Marquart, Thomas; Way, Michael; Blomqvist, Anna; Östlin, Göran; Zackrisson, Erik

doi:10.1051/0004-6361/201525692

Cited by 47 publications

(45 citation statements)

References 199 publications

(226 reference statements)

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“…Several definitions of a starburst exist in the literature (e.g., Knapen & James 2009;McQuinn et al 2010;Bergvall et al 2015). The birthrate parameter, b = SFR/ SFR is often used, and compares the current SFR or the peak of the burst to the average SFR over the past Gyr or even the lifetime of the system.…”

Section: Discussionmentioning

confidence: 99%

Dark influences

Starkenburg

Helmi

Sales

2016

A&A

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Context. It has been proposed that mergers induce starbursts and lead to important morphological changes in galaxies. Most studies so far have focused on large galaxies, but dwarfs might also experience such events, since the halo mass function is scale-free in the concordance cosmological model. Notably, because of their low mass, most of their interactions will be with dark satellites. Aims. In this paper we follow the evolution of gas-rich disky dwarf galaxies as they experience a minor merger with a dark satellite. We aim to characterize the effects of such an interaction on the dwarf's star formation, morphology, and kinematical properties. Methods. We performed a suite of carefully set-up hydrodynamical simulations of dwarf galaxies that include dark matter, gas, and stars merging with a satellite consisting solely of dark matter. For the host system we vary the gas fraction, disk size and thickness, halo mass, and concentration, while we explore different masses, concentrations, and orbits for the satellite. Results. We find that the interactions cause strong starbursts of both short and long duration in the dwarfs. Their star formation rates increase by factors of a few to 10 or more. They are strongest for systems with extended gas disks and high gas fractions merging with a high-concentration satellite on a planar, radial orbit. In contrast to analogous simulations of Milky Way-mass galaxies, many of the systems experience strong morphological changes and become spheroidal even in the presence of significant amounts of gas. Conclusions. The simulated systems compare remarkably well with the observational properties of a large selection of irregular dwarf galaxies and blue compact dwarfs. This implies that mergers with dark satellites might well be happening but not be fully evident, and may thus play a role in the diversity of the dwarf galaxy population.

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Section: Discussionmentioning

confidence: 99%

Dark influences

Starkenburg

Helmi

Sales

2016

A&A

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“…For a particular galaxy, the birthrate parameter describes the significance of its current star formation in its long-term evolution. A galaxy with a birthrate parameter of b ≥ 3 is typically required to be considered a starburst (e.g., Bergvall et al 2015, and references therein). In the smallest dwarf galaxies, the effects of star formation can be more significant (i.e., the effects of feedback on galaxy-wide scales) than the same absolute amount of star formation in larger galaxies.…”

Section: Burst Strengthmentioning

confidence: 99%

“…In the local universe, intense star-forming galaxies are rare as only ∼1% of star-forming galaxies are considered starbursts with b ≥ 3 (Bergvall et al 2015). When combining this rarity with the stochastic nature of star-formation in dwarf galaxies (e.g., Lee et al 2009;Weisz et al 2012;Bauer et al 2013), it would appear that dwarf galaxies can experience increases and decreases in their star formation rate, and only a small fraction are starbursting at any given time.…”

Section: Introductionmentioning

confidence: 99%

Constraining the Stellar Populations and Star Formation Histories of Blue Compact Dwarf Galaxies with SED Fits

Janowiecki

Salzer

Zee

et al. 2017

ApJ

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We discuss and test possible evolutionary connections between Blue Compact Dwarf galaxies (BCDs) and other types of dwarf galaxies. BCDs provide ideal laboratories to study intense star formation episodes in low mass dwarf galaxies, and have sometimes been considered a short-lived evolutionary stage between types of dwarf galaxies. To test these connections, we consider a sample of BCDs as well as a comparison sample of nearby galaxies from the Local Volume Legacy (LVL) survey for context. We fit the multi-wavelength spectral energy distributions (SED, far-ultra-violet to far-infrared) of each galaxy with a grid of theoretical models to determine their stellar masses and star formation properties. We compare our results for BCDs with the LVL galaxies to put BCDs in the context of normal galaxy evolution. The SED fits demonstrate that the star formation events currently underway in BCDs are at the extreme of the continuum of normal dwarf galaxies, both in terms of the relative mass involved and in the relative increase over previous star formation rates. Today's BCDs are distinctive objects in a state of extreme star formation which is rapidly transforming them. This study also suggests ways to identify former BCDs whose star formation episodes have since faded.

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“…Tomczak et al 2014), exhibit a range of morphologies (e.g. Willett et al 2013), and can have vastly different star-formation (SF) rates (Bergvall et al 2015). Some exhibit active galactic nucleus (AGN) activity -powerful energetic bursts from accretion onto supermassive black holes, that are thought to impact on the life of the whole galaxy via feedback processes (e.g.…”

Section: Introductionmentioning

confidence: 99%

The galaxy–halo connection in the VIDEO survey at 0.5 <z< 1.7

Hatfield

Lindsay

Jarvis

et al. 2016

Mon. Not. R. Astron. Soc.

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We present a series of results from a clustering analysis of the first data release of the Visible and Infrared Survey Telescope for Astronomy (VISTA) Deep Extragalactic Observations (VIDEO) survey. VIDEO is the only survey currently capable of probing the bulk of stellar mass in galaxies at redshifts corresponding to the peak of star formation on degree scales. Galaxy clustering is measured with the two-point correlation function, which is calculated using a non parametric kernel based density estimator. We use our measurements to investigate the connection between the galaxies and the host dark matter halo using a halo occupation distribution methodology, deriving bias, satellite fractions, and typical host halo masses for stellar masses between 10 9.35 M and 10 10.85 M , at redshifts 0.5 < z < 1.7. Our results show typical halo mass increasing with stellar mass (with moderate scatter) and bias increasing with stellar mass and redshift consistent with previous studies. We find the satellite fraction increased towards low redshifts, from ∼ 5% at z ∼ 1.5, to ∼ 20% at z ∼ 0.6. We combine our results to derive the stellar mass to halo mass ratio for both satellites and centrals over a range of halo masses and find the peak corresponding to the halo mass with maximum star formation efficiency to be ∼ 2×10 12 M , finding no evidence for evolution.

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Local starburst galaxies and their descendants

Cited by 47 publications

References 199 publications

Dark influences

Dark influences

Constraining the Stellar Populations and Star Formation Histories of Blue Compact Dwarf Galaxies with SED Fits

The galaxy–halo connection in the VIDEO survey at 0.5 <z< 1.7

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