Results 31 to 40 of about 136,681 (287)
An Absorption Line at 4430.6 of Possibly Interstellar Origin [PDF]
Monthly Notices of the Royal Astronomical Society, 1938 C. S. Beals, G. H. Blanchet
openaire +2 more sources
Unveiling the chemistry of interstellar CH: Spectroscopy of the 2 THz N = 2 <- 1 ground state line [PDF]
, 2018 The methylidyne radical CH is commonly used as a proxy for H$_2$ in the cold, neutral phase of the interstellar medium. The optical spectroscopy of CH is limited by interstellar extinction, whereas far-infrared observations provide an integral view ...
H. Wiesemeyer +8 more
semanticscholar +1 more source
Interstellar absorption lines toward Cep OB4 [PDF]
Astronomy & Astrophysics, 2004 An analysis of optical echelle spectra towards nine stars in the Cep OB4 association is presented. Interstellar absorption lines which arise in the (1, 0) and (2,0) bands of the CN A 2 Π - X 2 Σ + red system towards BD+66° 1661, BD+66° 1674, and BD+66° 1675 are used to infer accurate CN column densities N(CN).
openaire +1 more source
GHRS and ORFEUS-II Observations of the Highly Ionized Interstellar Medium Toward ESO141-055 [PDF]
, 1999 We present Goddard High Resolution Spectrograph and ORFEUS-II measurements of Si IV, CIV, N V, and O VI absorption in the interstellar medium of the Galactic disk and halo toward the nucleus of the Seyfert galaxy ESO141-055.
Berkhuijsen E. +10 more
core +2 more sources
Debris discs with multiple absorption features in metallic lines: circumstellar or interstellar origin? [PDF]
, 2018 Debris disks are second generation dusty disks thought to be devoid of gas. However, this idea has been challenged in the last years by gas detections in some systems.
D. Iglesias +13 more
semanticscholar +1 more source
Discovery of Pulsed OH Maser Emission Stimulated by a Pulsar [PDF]
, 2005 Stimulated emission of radiation has not been directly observed in astrophysical situations up to this time. Here we demonstrate that photons from pulsar B1641-45 stimulate pulses of excess 1720 MHz line emission in an interstellar OH cloud.
Johnston, Simon +3 more
core +4 more sources
Interstellar Matter Structure along the Line of Sight to Cyg X-1
Open Astronomy, 2015 High-resolution spectra (R = 60 000) of Cyg X-1 = V1357 Cyg obtained with the NES echelle spectrograph of the Russian 6 meter telescope (3950–6690 Å) were used to study narrow interstellar absorption lines.
Bochkarev N. G. +3 more
doaj +1 more source
Interstellar absorption lines toward gamma Arae
The Astrophysical Journal, 1975 The available data on interstellar absorption lines in the spectrum of gamma Ara observed from the ground and with the Copernicus telescope have been analyzed to give column densities of various ion stages of H, C, N, O, Na, Mg, Si, P, S, Ar, Ca, Mn, and Fe.
D. C. Morton, E. M. Hu
openaire +1 more source
Absorption and scattering by interstellar dust in the silicon K-edge of GX 5-1 [PDF]
, 2016 Context. We study the absorption and scattering of X-ray radiation by interstellar dust particles, which allows us to access the physical and chemical properties of dust. The interstellar dust composition is not well understood, especially on the densest
S. Zeegers +14 more
semanticscholar +1 more source