Two radio supernova remnants discovered in the outer Galaxy

Foster, T.; Cooper, Barry; Reich, W.; Kothes, R.; West, Jennifer L.

doi:10.1051/0004-6361/201220362

Cited by 22 publications

(30 citation statements)

References 27 publications

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“…It is the faintest SNR yet observed, with a radio surface brightness at 1 GHz of Σ 1 GHz 1.1 × 10 −23 W m −2 Hz −1 sr −1 , a factor of three below the previous faintest known SNRs of Foster et al (2013). G181.1+9.5 presents a rare opportunity to study SNR evolution and offshoot topics (such as reverse-shock heating of explosion ejecta, suggested by the X-rays in the object's centre) in a uniquely pristine environment that is much different from the Galactic plane ISM.…”

Section: Discussionmentioning

confidence: 73%

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G181.1+9.5, a new high-latitude low-surface brightness supernova remnant

Kothes

Reich

Foster

et al. 2017

A&A

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Context. More than 90% of the known Milky Way supernova remnants (SNRs) are within 5• of the Galactic plane. The discovery of the new high-latitude SNR G181.1+9.5 will give us the opportunity to learn more about the environment and magnetic field at the interface between disk and halo of our Galaxy. Aims. We present the discovery of SNR G181.1+9.5, a new high-latitude SNR, serendipitously discovered in an ongoing survey of the Galactic anti-centre High-Velocity Cloud complex, observed with the DRAO Synthesis Telescope in the 21 cm radio continuum and H i spectral line.Methods. We use radio continuum observations (including the linearly polarized component) at 1420 MHz (observed with the DRAO ST) and 4850 MHz (observed with the Effelsberg 100-m radio telescope) to map G181.1+9.5 and determine its nature as a SNR. High-resolution 21 cm H i line observations and H i emission and absorption spectra reveal the physical characteristics of its local interstellar environment. Finally, we estimate the basic physical parameters of G181.1+9.5 using models for highly-evolved SNRs. Results. G181.1+9.5 has a circular shell-like morphology with a radius of about 16 pc at a distance of 1.5 kpc some 250 pc above the mid-plane. The radio observations reveal highly linearly polarized emission with a non-thermal spectrum. Archival ROSAT X-ray data reveal high-energy emission from the interior of G181.1+9.5 indicative of the presence of shock-heated ejecta. The SNR is in the advanced radiative phase of SNR evolution, expanding into the HVC inter-cloud medium with a density of n HI ≈ 1 cm −3 . Basic physical attributes of G181.1+9.5 calculated with radiative SNR models show an upper-limit age of 16 000 yr, a swept-up mass of more than 300 M , and an ambient density in agreement with that estimated from H i observations. Conclusions. G181.1+9.5 shows all characteristics of a typical mature shell-type SNR, but its observed faintness is unusual and requires further study.

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Section: Discussionmentioning

confidence: 73%

“…Over the last 15 yr, a total of 14 new SNRs and pulsar wind nebulae have been found in the Outer Milky Way Galaxy mostly with data from the Canadian Galactic plane Survey (Kothes et al 2001(Kothes et al , 2005Kothes 2003;Tian et al 2007;Foster et al 2013;Gerbrandt et al 2014). SNR G181.1+9.5 is, however, no ordinary SNR.…”

Section: Introductionmentioning

confidence: 99%

G181.1+9.5, a new high-latitude low-surface brightness supernova remnant

Kothes

Reich

Foster

et al. 2017

A&A

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“…Gao et al (2011) identified two new faint SNRs G25.1−2.3 and G178.2−4.2. Supplemented by the Urumqi λ6 cm data, Foster et al (2013) 1 http://zmtt.bao.ac.cn/6cm/ identified another two new SNRs G152.4−2.1 and G190.9−2.2 from the Canadian Galactic Plane Survey (CGPS) data. With the Giant Meterwave Radio Telescope, Roy & Pal (2013) have recently discovered a young SNR G354.4+0.0 in the central region of the Galaxy.…”

Section: Introductionmentioning

confidence: 99%

Discovery of a new supernova remnant G150.3+4.5

Gao

Han

2014

A&A

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Context. Large-scale radio continuum surveys have good potential for discovering new Galactic supernova remnants (SNRs). Surveys of the Galactic plane are often limited in the Galactic latitude of |b| ∼ 5 • . SNRs at high latitudes, such as the Cygnus Loop or CTA 1, cannot be detected by surveys in such limited latitudes. Aims. Using the available Urumqi λ6 cm Galactic plane survey data, together with the maps from the extended ongoing λ6 cm medium latitude survey, we wish to discover new SNRs in a large sky area. Methods. We searched for shell-like structures and calculated radio spectra using the Urumqi λ6 cm, Effelsberg λ11 cm, and λ21 cm survey data. Radio polarized emission and evidence in other wavelengths are examined for the characteristics of SNRs. Results. We discover an enclosed oval-shaped object G150.3+4.5 in the λ6 cm survey map. It is about 2.• 5 wide and 3 • high. Parts of the shell structures can be identified well in the λ11 cm, λ21 cm, and λ73.5 cm observations. The Effelsberg λ21 cm total intensity image resembles most of the structures of G150.3+4.5 seen at λ6 cm, but the loop is not closed in the northwest. High resolution images at λ21 cm and λ73.5 cm from the Canadian Galactic Plane Survey confirm the extended emission from the eastern and western shells of G150.3+4.5. We calculated the radio continuum spectral indices of the eastern and western shells, which are β ∼ −2.4 and β ∼ −2.7 between λ6 cm and λ21 cm, respectively. The shell-like structures and their non-thermal nature strongly suggest that G150.3+4.5 is a shell-type SNR. For other objects in the field of view, G151.4+3.0 and G151.2+2.6, we confirm that the shell-like structure G151.4+3.0 very likely has a SNR origin, while the circular-shaped G151.2+2.6 is an H ii region with a flat radio spectrum associated with optical filamentary structure, Hα, and infrared emission.

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“…5 +3.2, G150.5+3.8, and G160.1−1.1 (Gerbrandt et al 2014),a n dG 1 5 2 . 5 −2.1 (Foster et al 2013). Other SNR discoveries in the CGPS data were reported by Kothes et al (2001), Kothes (2003),K o t h e s et al (2005),T i a ne ta l .…”

Section: Structures Of Intermediate Sizementioning

confidence: 98%

A High Resolution Survey of the Galactic Plane at 408 MHz

Tung

Kothes

Landecker

et al. 2017

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Two radio supernova remnants discovered in the outer Galaxy

Cited by 22 publications

References 27 publications

G181.1+9.5, a new high-latitude low-surface brightness supernova remnant

G181.1+9.5, a new high-latitude low-surface brightness supernova remnant

Discovery of a new supernova remnant G150.3+4.5

A High Resolution Survey of the Galactic Plane at 408 MHz

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