Hoinga: a supernova remnant discovered in the SRG/eROSITA All-Sky Survey eRASS1

Becker, Werner; Hurley‐Walker, N.; Weinberger, Christoph; Mayer, M.; Merloni, A.

doi:10.1051/0004-6361/202040156

Cited by 28 publications

(15 citation statements)

References 85 publications

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“…While the acquired exposure and statistics for SNRs in the all-sky survey will of course not be comparable to this study, we hope to have demonstrated the excellent capabilities of eROSITA regarding the detection and characterization of diffuse emission. This will in particular be relevant for the search for new Galactic SNRs (e.g., Churazov et al 2021;Becker et al 2021), which may help reduce the discrepancy between the expected and observed number thereof. Furthermore, the survey will allow carrying out systematic studies of the spectral and morphological properties of the entire X-ray detected SNR population using a homogeneous data set (W. Becker et al, in prep.).…”

Section: Discussionmentioning

confidence: 99%

A global view of shocked plasma in the supernova remnant Puppis A provided by SRG/eROSITA

Mayer,

Becker,

Predehl

et al. 2021

Preprint

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Context. Puppis A is a medium-age supernova remnant (SNR), which is visible as a very bright extended X-ray source. While numerous studies have investigated individual features of the SNR, at this time, no comprehensive study of the entirety of its X-ray emission exists. Aims. Using field-scan data acquired by the SRG/eROSITA telescope during its calibration and performance verification phase, we aim to investigate the physical conditions of shocked plasma and the distribution of elements throughout Puppis A. In doing so, we take advantage of the uniform target coverage, excellent statistics, and decent spatial and spectral resolution of our data set. Methods. Using broad-and narrow-band imaging, we investigate the large-scale distribution of absorption and plasma temperature as well as typical emission lines. This approach is complemented by spatially resolved spectral analysis of the shocked plasma in Puppis A, for which we divide the SNR into around 700 distinct regions, resulting in maps of key physical quantities over its extent. Results. We find a strong peak of foreground absorption in the southwest quadrant, which in conjunction with high temperatures at the northeast rim creates the well-known strip of hard emission crossing Puppis A. Furthermore, using the observed distribution of ionization ages, we attempt to reconstruct the age of the shock in the individual regions. We find a quite recent shock interaction for the prominent northeast filament and ejecta knot, as well as for the outer edge of the bright eastern knot. Finally, elemental abundance maps reveal only a single clear enhancement of the plasma with ejecta material, consistent with a previously reported knot, and no obvious ejecta enrichment in the remainder of the SNR. Within this region, we confirm the spatial separation of siliconrich ejecta from those dominated by lighter elements. The apparent elemental composition of this ejecta-rich region would imply an unrealistically large silicon-to-oxygen ratio for a core-collapse supernova. In reality, both the observed ejecta composition and their apparent distribution may be biased by the unknown location and strength of the reverse shock.

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Section: Discussionmentioning

confidence: 99%

A global view of shocked plasma in the supernova remnant Puppis A provided by SRG/eROSITA

Mayer,

Becker,

Predehl

et al. 2021

Preprint

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“…Another extended (about 4.4 degrees in diameter) high latitude galactic SNR G249.5+24.5 (Hoinga) was recently discovered by SRG/eROSITA observatory Becker et al (2021). The authors constrained the distance D to be within the range of 0.45 < D < 1.2 kpc.…”

Section: Discussionmentioning

confidence: 99%

LOFAR detection of faint radio emission from the supernova remnant SRGeJ0023+3625=G116.6-26.1: probing the Milky Way synchrotron halo

Churazov,

Khabibullin,

Bykov

et al. 2022

Preprint

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A supernova remnant (SNR) candidate SRGe J0023+3625 = G116.6-26.1 was recently discovered in the SRG/eROSITA all-sky X-ray survey. This large (∼ 4 deg in diameter) SNR candidate lacks prominent counterparts in other bands. Here we report detection of radio emission from G116.6-26.1 in the LOFAR Two-metre Sky Survey (LoTTS-DR2). Radio images show a shell-like structure coincident with the X-ray boundary of the SNR. The measured surface brightness of radio emission from this SNR is very low. Extrapolation of the observed surface brightness to 1 GHz places G116.6-26.1 well below other objects in the Σ − 𝐷 diagram. We argue that the detected radio flux might be consistent with the minimal level expected in the van der Laan adiabatic compression model, provided that the volume emissivity of the halo gas in the LOFAR band is ∼ 10 −42 Wm −3 Hz −1 sr −1 . If true, this SNR can be considered as a prototypical example of an evolved SNR in the Milky Way halo. In the X-ray and radio bands, such SNRs can be used as probes of thermal and non-thermal components constituting the Milky Way halo.

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“…Due to increase in sensitivity of the present generation radio telescopes and with the advent of new detection tech-niques, some very large and very faint SNRs have recently been detected. For instance, a large size (∼ 4.4 degree diameter) SNR named 'Hoinga (G249.7+24.7)' with very low radio surface brightness (4 × 10 −23 W m −2 Hz −1 sr −1 at 1.4 GHz) was detected at Galactic latitude of ∼ 25 degree (Becker et al 2021;Fesen et al 2021). Another SNR 'G354-33' with angular size of 11 0 × 14 0 at Galactic latitude of −33.5 degree was detected in radio (Fesen et al 2021).…”

Section: Orcs As Snrs In Low Density Hot Mediummentioning

confidence: 99%

Odd Radio Circles as supernovae remnants in the intragroup medium

Omar

2022

Preprint

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A measurable fraction (∼ 8 per cent) of recently discovered arcmin-size circular diffuse radio sources termed as Odd Radio Circles or ORCs can be supernovae remnants in the intragroup medium, within the local group and its immediate neighbour groups of galaxies. This estimate is based on the optical detection rate of the intragroup supernovae events in the nearby (z ∼ 0.1 − 0.2) galaxy groups. A rate of about 5400 intragroup supernovae per million year is expected within the local and its immediate neighbour groups of galaxies. For a radio detectability period of about 10 4 years, on average 1.3 intragroup medium supernovae remnants per 1000 square degree are expected to be detected in the radio surveys with a sensitivity that led to discovery of ORCs. The angular size, surface brightness and radio flux of the supernova remnants up to a distance of ∼ 3 Mpc in the intragroup medium can be expected to be similar to the five known ORCs. The intragroup supernovae remnants are not residing in the dense and cold interstellar medium of the galaxies but evolving in low density (10 −4 − 10 −5 cm −3 ) warm medium (10 5 − 10 6 K) in galactic halos or beyond, and may find their progenitors in the diffuse stellar light associated with various tidal streamers surrounding the Milky-Way and other nearby galaxies.

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Hoinga: a supernova remnant discovered in the SRG/eROSITA All-Sky Survey eRASS1

Cited by 28 publications

References 85 publications

A global view of shocked plasma in the supernova remnant Puppis A provided by SRG/eROSITA

A global view of shocked plasma in the supernova remnant Puppis A provided by SRG/eROSITA

LOFAR detection of faint radio emission from the supernova remnant SRGeJ0023+3625=G116.6-26.1: probing the Milky Way synchrotron halo

Odd Radio Circles as supernovae remnants in the intragroup medium

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