A synchrotron superbubble in the IC 10 galaxy: a hypernova remnant?

Lozinskaya, T. A.; Моисеев, А. В.

doi:10.1111/j.1745-3933.2007.00359.x

Cited by 30 publications

(31 citation statements)

References 24 publications

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“…The observational fact that the much more massive (≳25 M ⊙ ) Wolf–Rayet stars seem to explode with E ej ∼ 10 52 erg s (e.g. Lozinskaya & Moiseev 2007) is a subtlety that, although important, does not substantially alter the general picture given the relative rarity of these stars.…”

Section: Cosmic Rays and Supernova Ratesmentioning

confidence: 99%

Probing star formation with galactic cosmic rays

Peršić

Rephaeli

2010

Monthly Notices of the Royal Astronomical Society

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Cosmic‐ray energy densities in central regions of starburst galaxies, as inferred from radio and γ‐ray measurements of, respectively, non‐thermal synchrotron and π0‐decay emission, are typically , i.e. typically at least an order of magnitude larger than near the Galactic Centre and in other not‐very‐actively star‐forming galaxies. We first show that these very different energy density levels reflect a similar disparity in the respective supernova (SN) rates in the two environments, which is not unexpected given the SN origin of (Galactic) energetic particles. As a consequence of this correspondence, we then demonstrate that there is partial quantitative evidence that the stellar initial mass function (IMF) in starburst nuclei has a low‐mass truncation at ∼2 M⊙, as predicted by theoretical models of turbulent media, in contrast with the much smaller value of 0.1 M⊙ that characterizes the low‐mass cut‐off of the stellar IMF in ‘normal’ galactic environments.

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Section: Cosmic Rays and Supernova Ratesmentioning

confidence: 99%

Probing star formation with galactic cosmic rays

Peršić

Rephaeli

2010

Monthly Notices of the Royal Astronomical Society

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“…The Milky Way is represented by a black star, assuming that the Milky Way's most luminous SNR is Cas A and its SFR is 1.9 ± 0.4 M yr −1 . the remnants of hypernovae/gamma-ray bursts (Lozinskaya & Moiseev 2007). Others may be interacting with unusually dense circumstellar material blown off by the progenitor star (e.g., the luminous SNR in NGC 4449; Milisavljevic & Fesen 2008).…”

Section: The Brightest Radio Supernova Remnant (Cassiopeia A)mentioning

confidence: 99%

Toward a Unification of Star Formation Rate Determinations in the Milky Way and Other Galaxies

Chomiuk

Povich

2011

The Astronomical Journal

320

287

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The star formation rate (SFR) of the Milky Way remains poorly known, with often-quoted values ranging from 1 to 10 M yr −1 . This situation persists despite the potential for the Milky Way to serve as the ultimate SFR calibrator for external galaxies. We show that various estimates for the Galactic SFR are consistent with one another once they have been normalized to the same initial mass function (IMF) and massive star models, converging to 1.9 ± 0.4 M yr −1 . However, standard SFR diagnostics are vulnerable to systematics founded in the use of indirect observational tracers sensitive only to high-mass stars. We find that absolute SFRs measured using resolved low/intermediate-mass stellar populations in Galactic H ii regions are systematically higher by factors of ∼2-3 compared with calibrations for SFRs measured from mid-IR and radio emission. We discuss some potential explanations for this discrepancy and conclude that it could be allayed if (1) the power-law slope of the IMF for intermediate-mass (1.5 M < m < 5M ) stars were steeper than the Salpeter slope or (2) a correction factor was applied to the extragalactic 24 μm SFR calibrations to account for the duration of star formation in individual mid-IR-bright H ii regions relative to the lifetimes of O stars. Finally, we present some approaches for testing whether a Galactic SFR of ∼2 M yr −1 is consistent with what we would measure if we could view the Milky Way as external observers. Using luminous radio supernova remnants and X-ray point sources, we find that the Milky Way deviates from expectations at the 1σ -3σ level, hinting that perhaps the Galactic SFR is overestimated or extragalactic SFRs need to be revised upward.

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“…′′ 95; Bauer & Brandt 2004;Barnard et al 2014). It has been speculated that a core collapse of the IC 10 X-1 progenitor in a 'hypernova' could be responsible for the NSB, rather than a series of SNe (Lozinskaya & Moiseev 2007).…”

Section: Introductionmentioning

confidence: 99%

The non-thermal superbubble in IC 10: the generation of cosmic ray electrons caught in the act

Heesen¹,

Brinks²,

Krause³

et al. 2014

Monthly Notices of the Royal Astronomical Society: Letters

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Superbubbles are crucial for stellar feedback, with supposedly high (of the order of 10 per cent) thermalization rates. We combined multiband radio continuum observations from the Very Large Array (VLA) with Effelsberg data to study the non-thermal superbubble (NSB) in IC 10, a starburst dwarf irregular galaxy in the Local Group. Thermal emission was subtracted using a combination of Balmer Hα and VLA 32 GHz continuum maps. The bubble's nonthermal spectrum between 1.5 and 8.8 GHz displays curvature and can be well fitted with a standard model of an ageing cosmic ray electron population. With a derived equipartition magnetic field strength of 44 ± 8 µG, and measuring the radiation energy density from Spitzer MIPS maps as 5±1×10 −11 erg cm −3 , we determine, based on the spectral curvature, a spectral age of the bubble of 1.0 ± 0.3 Myr. Analysis of the LITTLE THINGS H I data cube shows an expanding H I hole with 100 pc diameter and a dynamical age of 3.8 ± 0.3 Myr, centred to within 16 pc on IC 10 X-1, a massive stellar mass black hole (M > 23 M ⊙ ). The results are consistent with the expected evolution for a superbubble with a few massive stars, where a very energetic event like a Type Ic supernova/hypernova has taken place about 1 Myr ago. We discuss alternatives to this interpretation.

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A synchrotron superbubble in the IC 10 galaxy: a hypernova remnant?

Cited by 30 publications

References 24 publications

Probing star formation with galactic cosmic rays

Probing star formation with galactic cosmic rays

Toward a Unification of Star Formation Rate Determinations in the Milky Way and Other Galaxies

The non-thermal superbubble in IC 10: the generation of cosmic ray electrons caught in the act

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