Synergy SKA - CTA: Supernova remnants as cosmic accelerators

Ingallinera, A.; Trigilio, C.; Umana, G.; Leto, P.; Buemi, C. S.; Schillirò, F.; Bufano, F.; Riggi, S.; Cavallaro, F.

doi:10.1017/s1743921317004574

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…We encourage a search for indications of supernovae and other transients in historical records from the southern hemisphere. Finally, we look forward to deep surveys of the southern sky in the radio by the Square Kilometer Array and in high-energy gamma rays by the Cerenkov Telescope Array; this may detect the expansion of Galactic supernova remnants, and reveal new remnants, perhaps including events within the historical past (Ingallinera et al 2017). Carlo results should be compared.…”

Section: Discussionmentioning

confidence: 99%

Witnessing History: Rates and Detectability of Naked-Eye Milky-Way Supernovae

Murphey,

Hogan,

Fields

et al. 2020

Preprint

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The Milky Way hosts on average a few supernova explosions per century, yet in the past millennium only five supernovae have been identified confidently in the historical record. This deficit of naked-eye supernovae is at least partly due to dust extinction in the Galactic plane. We explore this effect quantitatively, developing a formalism for the supernova probability distribution, accounting for dust and for the observer's flux limit. We then construct a fiducial axisymmetric model for the supernova and dust densities, featuring an exponential dependence on galactocentric radius and height, with core-collapse events in a thin disk and Type Ia events including a thick disk component. When no flux limit is applied, our model predicts supernovae are intrinsically concentrated in the Galactic plane, with Type Ia events extending to higher latitudes reflecting their thick disk component. We then apply a flux limit and include dust effects, to predict the sky distribution of historical supernovae. We use well-observed supernovae as light-curve templates, and introduce naked-eye discovery criteria. The resulting sky distributions are strikingly inconsistent with the locations of confident historical supernovae, none of which lie near our model's central peaks. Indeed, SN 1054 lies off the plane almost exactly in the anticenter, and SN 1181 is in the 2nd Galactic quadrant. We discuss possible explanations for these discrepancies. We calculate the percentage of all supernovae bright enough for historical discovery: 13% of core-collapse and 33% of Type Ia events. Using these and the confident historical supernovae, we estimate the intrinsic Galactic supernova rates, finding general agreement with other methods. Finally, we urge searches for supernovae in historical records from civilizations in the southern hemisphere.

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Section: Discussionmentioning

confidence: 99%

Witnessing History: Rates and Detectability of Naked-Eye Milky-Way Supernovae

Murphey,

Hogan,

Fields

et al. 2020

Preprint

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“…H regions). Recently, the study and characterization of stellar relics, such as Galactic supernova remnants (SNRs) in connection with observations at different wavelengths (infrared and gamma-ray primarily) has become an additional target of interest (Ingallinera et al 2017). The survey also represents an important testbench for the ASKAP data reduction pipeline in the Galactic plane and for the analysis methods designed for the upcoming EMU survey.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary Map of the Universe (EMU):Compact radio sources in the SCORPIO field towards the Galactic plane

Riggi,

Umana,

Trigilio

et al. 2021

Preprint

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We present observations of a region of the Galactic plane taken during the Early Science Program of the Australian Square Kilometre Array Pathfinder (ASKAP). In this context, we observed the S field at 912 MHz with an uncompleted array consisting of 15 commissioned antennas. The resulting map covers a square region of ∼40 deg 2 , centred on (l, b)=(343.5 • ,0.75 • ), with a synthesized beam of 24"×21" and a background rms noise of 150-200 µJy/beam, increasing to 500-600 µJy/beam close to the Galactic plane. A total of 3963 radio sources were detected and characterized in the field using the source finder. We obtained differential source counts in agreement with previously published data after correction for source extraction and characterization uncertainties, estimated from simulated data. The ASKAP positional and flux density scale accuracy were also investigated through comparison with previous surveys (MGPS, NVSS) and additional observations of the S field, carried out with ATCA at 2.1 GHz and 10" spatial resolution. These allowed us to obtain a measurement of the spectral index for a subset of the catalogued sources and an estimated fraction of (at least) 8% of resolved sources in the reported catalogue. We cross-matched our catalogued sources with different astronomical databases to search for possible counterparts, finding ∼150 associations to known Galactic objects. Finally, we explored a multiparametric approach for classifying previously unreported Galactic sources based on their radio-infrared colors.

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“…H II regions). Recently, the study and characterization of stellar relics, such as Galactic supernova remnants (SNRs) in connection with observations at different wavelengths (infrared and gamma-ray primarily) has become an additional target of interest (Ingallinera et al 2017). The survey also represents an important testbench for the ASKAP data reduction pipeline in the Galactic plane and for the analysis methods designed for the upcoming EMU survey.…”

mentioning

confidence: 99%

Evolutionary map of the Universe (EMU): Compact radio sources in the scorpio field towards the galactic plane

Riggi

Umana

Trigilio

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present observations of a region of the Galactic plane taken during the Early Science Program of the Australian Square Kilometre Array Pathfinder (ASKAP). In this context, we observed the scorpio field at 912 MHz with an uncompleted array consisting of 15 commissioned antennas. The resulting map covers a square region of ∼40 deg2, centred on (l, b) = (343.5°, 0.75°), with a synthesized beam of 24 × 21 arcsec2 and a background rms noise of 150–200 μJy beam−1, increasing to 500–600 μJy beam−1 close to the Galactic plane. A total of 3963 radio sources were detected and characterized in the field using the caesar source finder. We obtained differential source counts in agreement with previously published data after correction for source extraction and characterization uncertainties, estimated from simulated data. The ASKAP positional and flux density scale accuracy were also investigated through comparison with previous surveys (MGPS, NVSS) and additional observations of the scorpio field, carried out with ATCA at 2.1 GHz and 10 arcsec spatial resolution. These allowed us to obtain a measurement of the spectral index for a subset of the catalogued sources and an estimated fraction of (at least) 8 per cent of resolved sources in the reported catalogue. We cross-matched our catalogued sources with different astronomical data bases to search for possible counterparts, finding ∼150 associations to known Galactic objects. Finally, we explored a multiparametric approach for classifying previously unreported Galactic sources based on their radio-infrared colours.

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Synergy SKA - CTA: Supernova remnants as cosmic accelerators

Cited by 4 publications

References 12 publications

Witnessing History: Rates and Detectability of Naked-Eye Milky-Way Supernovae

Witnessing History: Rates and Detectability of Naked-Eye Milky-Way Supernovae

Evolutionary Map of the Universe (EMU):Compact radio sources in the SCORPIO field towards the Galactic plane

Evolutionary map of the Universe (EMU): Compact radio sources in the scorpio field towards the galactic plane

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