Numerical Models for Supernova Remnants

Mansfield, V. N.; Salpeter, E. E.

doi:10.1086/152877

Cited by 29 publications

(19 citation statements)

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“…rays entrained and generated in the shock waves of a supernova would increase the •øBe production rate in the atmosphere of the Earth after encounter. With the limited data available, the løBe spikes have similar characteristics to the modeled shock wave [Mansfield and Salpeter, 1974;Hamilton and Fesen, 1988] in that there is a fast rise time followed by a slower decrease in the production of løBe as the affects of the shock wave lessen. The increase may even be followed by an actual decrease as seen in Figure 2a in the •øBe production rate as the shock wave sweeps cosmic rays in front of it in a manner similar to the "orbush"effect [Forbush, 1946].…”

Section: Discussionmentioning

confidence: 89%

Enhanced cosmic‐ray production of ¹⁰Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

McHargue

Damon

Donahue

1995

Geophysical Research Letters

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The cosmogenic isotope 10Be, total Be, and Al were measured in partly varved sediments from the upper 50 m of core 480, leg 64 (DSDP), Gulf of California. The concentration of 10Be from 1 to 50 kyr is in general agreement with estimates of the geomagnetic dipole moment obtained from archaeomagnetic and marine core research. 10Be anomalies were also found at 32 kyr and 43 kyr, contemporaneous with the Mono Lake and Laschamp excursions, respectively. The production of 10Be required to explain these anomalies is too high, particularly for the Mono Lake excursion, to be produced by a combination of decreased geomagnetic field and unprecedented long‐term solar activity. We conclude that the cause is a change in the galactic cosmic‐ray flux consistent with a supernova event. The coincidence with the two excursions remains a paradox.

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Section: Discussionmentioning

confidence: 89%

Enhanced cosmic‐ray production of ¹⁰Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

McHargue

Damon

Donahue

1995

Geophysical Research Letters

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“…In order to compute the detection probability in , we need the mass of the shell as a function of its velocity. At the time of shell formation, the swept‐up mass of H atoms using R sf in is During the shell‐formation stage, a good fraction (∼50 per cent) of this mass is compressed into a dense, neutral shell (Chevalier 1974; Mansfield & Salpeter 1974), and, after the formation, the subsequently shocked ambient gas is simply added to the shell. The hot interior gas also continuously runs into the dense shell to add extra mass, but its contribution is relatively small.…”

Section: Description Of Modelmentioning

confidence: 99%

Visibility of old supernova remnants in H i 21-cm emission line

Koo

Kang

2004

Monthly Notices of the Royal Astronomical Society

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We estimate the number of old, radiative supernova remnants (SNRs) detectable in H i 21‐cm emission line in the Galaxy. We assume that old SNRs consist of expanding H i shells and that they are visible if the line‐of‐sight velocities are sufficiently outside the velocity range of the Galactic background H i emission. This criterion of visibility makes it possible to calculate the background contamination and to make a comparison with observation. The Galactic disc in our model is filled with atomic gas of moderate (∼0.1 cm−3) density representing the warm neutral interstellar medium. We assume that only Type Ia supernovae produce isolated SNRs with expanding H i shells, or ‘H i SNRs’. According to our result, the contamination due to the Galactic background H i emission limits the number of visible SNRs to ≃270, or ≃9 per cent of the total H i SNRs. They are concentrated along the loci of tangential points. The telescope sensitivity further limits the number. We compare the result with observations to find that the observed number (≤25) of H i SNRs is much less than expected. A plausible explanation is that previous observational studies, which were made towards the SNRs identified mostly in radio continuum, missed most of the H i SNRs because they are too faint to be visible in radio continuum. We propose that the faint, extended H i 21‐cm emission line wings protruding from the Galactic background H i emission in large‐scale (ℓ, v) diagrams could be possible candidates for H i SNRs, although our preliminary result shows that their number is considerably less than expected in the inner Galaxy. We conclude that a possible explanation for the small number of H i SNRs in the inner Galaxy is that the interstellar space there is largely filled with a very tenuous gas as in the three‐phase interstellar medium (ISM) model, not with the warm neutral medium of moderate density.

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“…The late 1970s also saw a lot of work on planetary nebulae where controversy and hydrodynamics overlap, and some work by Vic Mansfield on supernova remnants (Mansfield & Salpeter 1974). A similar overlap occurs in a series of papers on accretion onto neutron stars, starting with Shapiro & Salpeter (1975).…”

Section: The Interstellar Medium and Hydrodynamicsmentioning

confidence: 90%

A Generalist Looks Back

Salpeter

2002

Annu. Rev. Astron. Astrophys.

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I have stayed at Cornell ever since, and I have essentially had only a single job in my whole life, but have switched fields quite often. I worked in nuclear astrophysics and in late-stellar evolution, estimated the Initial Mass Function for star formation and the metal enrichment of the interstellar medium. I suggested black hole accretion as the energy source for quasars, worked on molecule formation on dust grain surfaces, and was involved in 21-cm studies of gas clouds and disk galaxies. I collaborated with my wife on the neurobiology of the neuromuscular junction and with one of my daughters on the epidemiology of tuberculosis.

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Numerical Models for Supernova Remnants

Cited by 29 publications

References 0 publications

Enhanced cosmic‐ray production of ¹⁰Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

Enhanced cosmic‐ray production of ¹⁰Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

Visibility of old supernova remnants in H i 21-cm emission line

A Generalist Looks Back

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Numerical Models for Supernova Remnants

Cited by 29 publications

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Enhanced cosmic‐ray production of 10Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

Enhanced cosmic‐ray production of 10Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

Visibility of old supernova remnants in H i 21-cm emission line

A Generalist Looks Back

Contact Info

Product

Resources

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Enhanced cosmic‐ray production of ¹⁰Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions

Enhanced cosmic‐ray production of ¹⁰Be coincident with the Mono Lake and Laschamp Geomagnetic Excursions