Light Echoes of Historic Transients
نویسندگان
چکیده
منابع مشابه
Light Echoes of Transients and Variables in the Local Universe
Astronomical light echoes, the time-dependent light scattered by dust in the vicinity of varying objects, have been recognized for over a century. Initially, their utility was thought to be confined to mapping out the three-dimensional distribution of interstellar dust. Recently, the discovery of spectroscopically useful light echoes around centuries-old supernovae in the Milky Way and the Larg...
متن کاملI . Search for Light Echoes
We have used FORS1 at the ESO VLT to search for light echoes in imaging polarimetry from four historical supernovæ in the face-on nearby spiral galaxy M83 (NGC 5236). No echoes were detected around our targets (SN 1923A, SN 1945B, SN 1950B and SN 1957D). This implies that the interstellar medium in their environs is rather tenuous (a few particles per cm), possibly as a result of previous super...
متن کاملSynthesized light transients.
Manipulation of electron dynamics calls for electromagnetic forces that can be confined to and controlled over sub-femtosecond time intervals. Tailored transients of light fields can provide these forces. We report on the generation of subcycle field transients spanning the infrared, visible, and ultraviolet frequency regimes with a 1.5-octave three-channel optical field synthesizer and their a...
متن کاملLight Echoes in Type Ia Supernovae
Light echoes are a promising tool to probe the environment where SNe Ia explode and an independent source of information on the progenitor’s nature. After giving a brief introduction to the phenomenon we review the two known cases, i.e. SNe 1991T and 1998bu. We then present the results we obtained from the test case of SN 1998es in NGC 632. This object was classified as a 1991T-like event and w...
متن کاملOn the Search for Quasar Light Echoes
The UV radiation from a quasar leaves a characteristic pattern in the distribution of ionized hydrogenthroughout the surrounding space. This pattern or light echo propagates through the intergalacticmedium at the speed of light, and can be observed by its imprint on the Lyα forest spectra of background sources. As the echo persists after the quasar has switched off, it offers the possib...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2013
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921313009356