The chemical evolution of IC 10

Yin, Jian-Tao; Magrini, L.; Matteuccí, F.; Lanfranchi, Gustavo A.; Gonçalves, Denise R.; Costa, R. D. D.

doi:10.1051/0004-6361/201014377

Cited by 24 publications

(28 citation statements)

References 51 publications

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“…Since IC 10 has recently undergone an active burst of star formation (Vacca et al 2007;Yin et al 2010), the contribution of the thermal free-free emission to the total radio continuum emission could be significant. We estimated the thermal emission from IC 10 using the Hα emission as its tracer, because it originates from the recombination of the same free electrons that produces the free-free emission.…”

Section: Thermal Emission Separationmentioning

confidence: 99%

New insights into the interstellar medium of the dwarf galaxy IC 10: connection between magnetic fields, the radio–infrared correlation and star formation

Basu

Roychowdhury

Heesen

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the highest sensitivity and angular resolution study at 0.32 GHz of the dwarf irregular galaxy IC 10, observed using the Giant Metrewave Radio Telescope, probing ∼ 45 pc spatial scales. We find the galaxy-averaged radio continuum spectrum to be relatively flat, with a spectral index α = −0.34 ± 0.01 (S ν ∝ ν α ), mainly due to a high contribution from free-free emission. At 0.32 GHz, some of the Hii regions show evidence of free-free absorption as they become optically thick below ∼ 0.41 GHz with corresponding free electron densities of ∼ 11 − 22 cm −3 . After removing the free-free emission, we studied the radio-infrared relations on 55, 110 and 165 pc spatial scales. We find that on all scales the non-thermal emission at 0.32 and 6.2 GHz correlates better with far-infrared (FIR) emission at 70 µm than mid-infrared emission at 24 µm. The dispersion of the radio-FIR relation arises due to variations in both magnetic field and dust temperature, and decreases systematically with increasing spatial scale. The effect of cosmic ray transport is negligible as cosmic ray electrons were only injected 5 Myr ago. The average magnetic field strength (B) of 12 µG in the disc is comparable to that of large star-forming galaxies. The local magnetic field is strongly correlated with local star formation rate (SFR) as B ∝ SFR 0.35±0.03 , indicating a star-burst driven fluctuation dynamo to be efficient (∼ 10 per cent) in amplifying the field in IC 10. The high spatial resolution observations presented here suggest that the high efficiency of magnetic field amplification and strong coupling with SFR likely sets up the radio-FIR correlation in cosmologically young galaxies.

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Section: Thermal Emission Separationmentioning

confidence: 99%

New insights into the interstellar medium of the dwarf galaxy IC 10: connection between magnetic fields, the radio–infrared correlation and star formation

Basu

Roychowdhury

Heesen

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…Martin 1999; Martin, Kobulnicky & Heckman 2002). In order to consider a galactic wind we follow the method described in Bradamante et al (1998) and Yin et al (2010); in particular, the wind rate is assumed to be proportional to the SFR through a free parameter λ i larger than zero: where i represents a specific chemical element. To have a preferential loss of metals, as indicated by dynamical models (e.g.…”

Section: The Chemical Evolution Modelsmentioning

confidence: 99%

Metallicity effects on cosmic Type Ib/c supernovae and gamma-ray burst rates

Grieco¹,

Matteuccí

Meynet

et al. 2012

Monthly Notices of the Royal Astronomical Society

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Type Ib/c supernovae (SNe Ib/c) are likely to be associated with long gamma‐ray bursts (GRBs), and therefore it is important to compare the SN rate in galaxies with the GRB rate. To do this we computed SN Ib/c rates in galaxies of different morphological types (ellipticals, spirals and irregulars) by assuming different histories of star formation and different SN Ib/c progenitors. We included some recent suggestions about the dependence of the minimum mass of single Wolf–Rayet (WR) stars on the stellar metallicity and therefore on galactic chemical evolution. We adopted several cosmic star formation rates (i.e. relative to a comoving unitary volume of the Universe) as a function of cosmic time, either observationally or theoretically derived, including the one computed with our galaxy models. We then computed the cosmic SN Ib/c rates. Our results show that the predicted SN Ib/c rates in spirals and irregulars can reproduce well the present observed rates if both single WR stars and massive binary systems are taken into account as SN Ib/c progenitors. The metallicity effects on the minimum mass for single WR stars are evident mainly in the early phases of galaxy evolution and do not influence substantially the predicted local Type Ib/c rates. We reached the following conclusions. (i) The ratio cosmic GRB rate /cosmic Type Ib/c rate varies in the range 10−2–10−4 in the whole redshift range, thus suggesting that only a small fraction of all SNe Ib/c gives rise to GRBs. (ii) The metallicity dependence of SN Ib/c progenitors produces lower cosmic SN Ib/c rates at early times, for any chosen cosmic star formation rate. (iii) Different theoretical cosmic star formation rates, computed under different scenarios of galaxy formation, produce SN Ib/c cosmic rates that differ mainly at very high redshifts. However, it is difficult to draw firm conclusions on the high‐redshift trend because of the large uncertainties in the data. (iv) GRBs can be important tracers of star formation at high redshifts if their luminosity function does not vary with redshift, and they can help in discriminating among galaxy formation models.

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“…The broad range of star formation efficiencies and wind strengths allow us to explain the possibility that DLA systems originate in a variety of dwarf galaxies, including dwarf irregulars, low surface brightness, and dwarf spheroidals. A complete description of the model equations and parameters can be found in Yin et al (2010).…”

Section: Models Of Dwarf Irregular Galaxiesmentioning

confidence: 99%

Silicon depletion in damped Ly αsystems

Vladilo

Abate²,

Yin

et al. 2011

A&A

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Silicates are an important component of interstellar dust that has been poorly investigated in high redshift galaxies. As a preliminary step to studying silicates at high redshift, we survey silicon depletions in damped Ly α (DLA) systems. Silicon depletion is mild in the Galactic interstellar medium (ISM) and is expected to be weaker in most DLA systems, so we introduce a method for improving the accuracy of DLA depletion measurements. We compare abundance ratios measured in the gas with calculations of total abundance ratios of gas and dust predicted by models of galactic chemical evolution tailored for DLA systems. To tune the model parameters, we use the dust-free observational diagram S/Zn versus Zn/H, and we also compare the look back time estimated from the absorption redshift with the evolutionary time predicted by the model. By applying our method to a large set of DLA column densities, we succeeded in measuring the depletion of silicon in 74 systems. For comparison, we also measure iron and magnesium depletions (105 and 10 systems, respectively) with the same method. The mean depletion of silicon that we derive, δ Si −0.27 ± 0.16 dex, is surprisingly close to that of iron, δ Fe −0.42 ± 0.28 dex, despite iron being much more depleted than silicon in the Galactic ISM. Silicon depletion in DLA systems does not correlate with metallicity, at variance with iron depletion, for which we confirm a rise with [Fe/H] found in previous work. Magnesium depletion seems to behave more in accordance with silicon than with iron. The different behaviors of the silicon and iron depletions suggests a complex history of dust production at the early stages of galactic chemical evolution.

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The chemical evolution of IC 10

Cited by 24 publications

References 51 publications

New insights into the interstellar medium of the dwarf galaxy IC 10: connection between magnetic fields, the radio–infrared correlation and star formation

New insights into the interstellar medium of the dwarf galaxy IC 10: connection between magnetic fields, the radio–infrared correlation and star formation

Metallicity effects on cosmic Type Ib/c supernovae and gamma-ray burst rates

Silicon depletion in damped Ly αsystems

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