Radio planetary nebulae in the Small Magellanic Cloud

Leverenz, Howard; Filipović, Miroslav; Bojičić, Ivan S.; Crawford, E. J.; Collier, J. D.; Grieve, Kevin; Draskovic, Danica; Reid, Warren A.

doi:10.1007/s10509-016-2686-3

Cited by 7 publications

(9 citation statements)

References 59 publications

(85 reference statements)

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“…We used the combined sample of 37 radio PNe from the LMC and the SMC (Leverenz et al 2016) with available re- Table 6. Parameters of the simulated samples and results of the sensitivity simulations for the LMC sample and the combined sample.…”

Section: Discussionmentioning

confidence: 99%

“…6). Additionally we included nine SMC PNe from Leverenz et al (2016): SMP S6, SMP S13, SMP S14, SMP S16, SMP S17, SMP S18, SMP S19, SMP S22, and SMP S24. These SMC PNe were unambiguously determined not to be PN mimics and were also re-scaled to the distance of the LMC.…”

Section: Radio-continuum Properties Of the Detected Pnementioning

confidence: 99%

“…Recently, Leverenz et al (2016) described the Σ-D relation for a sample of SMC PNe. Here, we extended that work by analyzing our radio detected PNe in terms of the Σ-D relation for both the LMC and the SMC.…”

Section: σ − D Relation For Pnementioning

confidence: 99%

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Radio Planetary Nebulae in the Large Magellanic Cloud

Leverenz

Filipović

Vukotić

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present 21 new radio-continuum detections at catalogued planetary nebula (PN) positions in the Large Magellanic Cloud (LMC) using all presently available data from the Australia Telescope Online Archive at 3, 6, 13 and 20 cm. Additionally, 11 previously detected LMC radio PNe are re-examined with 7 detections confirmed and reported here. An additional three PNe from our previous surveys are also studied. The last of the 11 previous detections is now classified as a compact H ii region which makes for a total sample of 31 radio PNe in the LMC. The radio-surface brightness to diameter (Σ-D) relation is parametrised as Σ ∝ D −β . With the available 6 cm Σ-D data we construct Σ-D samples from 28 LMC PNe and 9 Small Magellanic Cloud (SMC) radio detected PNe. The results of our sampled PNe in the Magellanic Clouds (MCs) are comparable to previous measurements of the Galactic PNe. We obtain β = 2.9 ± 0.4 for the MC PNe compared to β = 3.1 ± 0.4 for the Galaxy. For a better insight into sample completeness and evolutionary features we reconstruct the Σ-D data probability density function (PDF). The PDF analysis implies that PNe are not likely to follow linear evolutionary paths. To estimate the significance of sensitivity selection effects we perform a Monte Carlo sensitivity simulation on the Σ-D data. The results suggest that selection effects are significant for values larger than β ∼ 2.6 and that a measured slope of β = 2.9 should correspond to a sensitivity-free value of ∼ 3.4.

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Section: Discussionmentioning

confidence: 99%

Section: Radio-continuum Properties Of the Detected Pnementioning

confidence: 99%

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Radio Planetary Nebulae in the Large Magellanic Cloud

Leverenz

Filipović

Vukotić

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…Radio emission from star-forming galaxies originates from two main sources, thermal emission from HII regions and non-thermal emission from Cosmic Ray electrons (CRe) that have been accelerated in SNR shock fronts. It is unlikely that any detections are related to X-ray binaries or Planetary Nebulae (Fender & Hendry 2000;Leverenz et al 2016) as at the distance of IC 10, these sources would have flux densties of order 1 µJy. Very long baseline interferometers, such as e-MERLIN, effectively resolve out nearly all extended emis-sion within observed galaxies, essentially highlighting compact star-forming products and contaminating background sources.…”

Section: Resultsmentioning

confidence: 99%

A High-Resolution Radio Continuum Study Of The Dwarf Irregular Galaxy IC 10

Westcott

Brinks

Beswick

et al. 2017

Mon. Not. R. Astron. Soc.

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We present high-resolution e-MERLIN radio continuum maps of the Dwarf Irregular galaxy IC 10 at 1.5 GHz and 5 GHz. We detect 11 compact sources at 1.5 GHz, 5 of which have complementary detections at 5 GHz. We classify 3 extended sources as compact HII regions within IC 10, 5 sources as contaminating background galaxies and identify 3 sources which require additional observations to classify. We do not expect that any of these 3 sources are Supernova Remnants as they will likely be resolved out at the assumed distance of IC 10 (0.7 Mpc). We correct integrated flux densities of IC 10 from the literature for contamination by unrelated background sources and obtain updated flux density measurements of 354 ± 11 mJy at 1.5 GHz and 199 ± 9 mJy at 4.85 GHz. The background contamination does not contribute significantly to the overall radio emission from IC 10, so previous analysis concerning its integrated radio properties remain valid.

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“…To date, some 85 SNRs in the MCs have been identified, with a further 20 candidates awaiting confirmation (Maggi et al 2016;Bozzetto et al 2017). Similarly, over 50 PNe (Filipović et al 2009;Bojičić et al 2010;Leverenz et al 2016Leverenz et al , 2017 and hundreds of H ii regions and YSOs have been identified (see for example Oliveira et al 2013). Over 8500 radio sources have also been E-mail: tana.joseph@manchester.ac.uk (TDJ) detected in the region of the Clouds -mainly AGN, radio galaxies and quasars (Wong et al 2012b;Collier 2016, Grieve et al in prep.).…”

Section: Introductionmentioning

confidence: 97%

The ASKAP EMU Early Science Project: radio continuum survey of the Small Magellanic Cloud

Joseph

Filipović

Crawford

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present two new radio continuum images from the Australian Square Kilometre Array Pathfinder (ASKAP) survey in the direction of the Small Magellanic Cloud (SMC). These images are part of the Evolutionary Map of the Universe (EMU) Early Science Project (ESP) survey of the Small and Large Magellanic Clouds. The two new source lists produced from these images contain radio continuum sources observed at 960 MHz (4489 sources) and 1320 MHz (5954 sources) with a bandwidth of 192 MHz and beam sizes of 30.0 ×30.0 and 16.3 ×15.1 , respectively. The median Root Mean Squared (RMS) noise values are 186 µJy beam −1 (960 MHz) and 165 µJy beam −1 (1320 MHz). To create point source catalogues, we use these two source lists, together with the previously published Molonglo Observatory Synthesis Telescope (MOST) and the Australia Telescope Compact Array (ATCA) point source catalogues to estimate spectral indices for the whole population of radio point sources found in the survey region. Combining our ASKAP catalogues with these radio continuum surveys, we found 7736 point-like sources in common over an area of 30 deg 2 . In addition, we report the detection of two new, low surface brightness supernova remnant candidates in the SMC. The high sensitivity of the new ASKAP ESP survey also enabled us to detect the bright end of the SMC planetary nebula sample, with 22 out of 102 optically known planetary nebulae showing point-like radio continuum emission. Lastly, we present several morphologically interesting background radio galaxies.

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Radio planetary nebulae in the Small Magellanic Cloud

Cited by 7 publications

References 59 publications

Radio Planetary Nebulae in the Large Magellanic Cloud

Radio Planetary Nebulae in the Large Magellanic Cloud

A High-Resolution Radio Continuum Study Of The Dwarf Irregular Galaxy IC 10

The ASKAP EMU Early Science Project: radio continuum survey of the Small Magellanic Cloud

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