Results 21 to 30 of about 1,250,237 (300)
Discovery of an Apparent High Latitude Galactic Supernova Remnant [PDF]
, 2015 Deep H$\alpha$ images of a faint emission complex 4.0 x 5.5 degrees in angular extent and located far off the Galactic plane at l = 70.0 degrees, b=-21.5 degrees reveal numerous thin filaments suggestive of a supernova remnant's shock emission.
Black, Christine +3 more
core +3 more sources
Constraints on the outflow in S106IR from He I 2.058- m absorption-line and H I emission-line profiles [PDF]
Monthly Notices of the Royal Astronomical Society, 1993 High spectral resolution observations of the massive young stellar object S106IR powering the bipolar H II region Sh-2 106 are presented and discussed. The new data, obtained at the United Kingdom Infrared Telescope using Cooled Grating Spectrometer No.
J. E. Drew, J. C. Bunn, M. G. Hoare
openaire +1 more source
Estimating the Oblateness of Dark Matter Halos Using Neutral Hydrogen Velocity Dispersion
The Astrophysical Journal Letters, 2023 We derive the oblateness parameter q of the dark matter halo of a sample of gas-rich, face-on disk galaxies. We have assumed that the halos are triaxial in shape but their axes in the disk plane ( a and b ) are equal, so that q = c / a measures the halo ...
Mousumi Das +4 more
doaj +1 more source
Confirmation of a Moving Component in the Hα Emission Line of LS I+61°303 [PDF]
International Astronomical Union Colloquium, 2000 AbstractWe report our attempts to detect and confirm a narrow moving component in the Hα emission line of LS I+61°303. The existence of this spectral feature was already suspected in the past. As a result, we find that this component does exist and that its radial velocity varies in agreement with the radio period of the system.
Radoslav K. Zamanov, Josep Martí
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High-resolution, H band Spectroscopy of Be Stars with SDSS-III/APOGEE: I. New Be Stars, Line Identifications, and Line Profiles [PDF]
, 2014 APOGEE has amassed the largest ever collection of multi-epoch, high-resolution (R~22,500), H-band spectra for B-type emission line (Be) stars. The 128/238 APOGEE Be stars for which emission had never previously been reported serve to increase the total ...
Beaton, Rachael +28 more
core +3 more sources
The profile of the hydrogen Hβ emission line in proton aurora [PDF]
Journal of Geophysical Research: Space Physics, 2001 Models of hydrogen‐proton transport in proton aurora predict the line profile of the hydrogen emissions from specified incident proton precipitation. We are using a model that includes collisional angular redistribution which leads to upward moving proton and hydrogen fluxes.
D. Lummerzheim, M. Galand
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Hαemission-line stars in molecular clouds [PDF]
Astronomy & Astrophysics, 2014 We present a deep survey of Halpha emission-line stars in the M42 region using wide-field objective prism films. A total of 1699 Halpha emission-line stars were identified, of which 1025 were previously unknown, within an area of 5.5 x 5.5 degrees centred on the Trapezium Cluster.
Pettersson, Bertil +2 more
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A slitless spectroscopic survey for Hαemission-line objects in SMC clusters [PDF]
Astronomy and Astrophysics, 2010 This paper checks on the roles of metallicity and evolutionary age in the appearance of the so-called Be phenomenon. Slitless CCD spectra were obtained covering the bulk of the Small Magellanic Cloud. For Halpha line emission twice as strong as the ambient continuum, the survey is complete to spectral type B2/B3 on the main sequence. About 8120 spectra
Martayan, Christophe +2 more
openaire +4 more sources
The Canada-France Redshift Survey XII: Nature of emission-line field galaxy population up to z = 0.3 [PDF]
, 1996 We present a spectroscopic study of the 138 field galaxies to a redshift z = 0.3 from the I-selected Canada-France Redshift Survey. 117(85%) spectra exhibit at least H alpha in emission, the remaining 21(15%) are purely absorption-line spectra.
Crampton, D. +6 more
core +3 more sources
Probing the Cold Neutral Medium through H I Emission Morphology with the Scattering Transform
The Astrophysical Journal, 2023 Neutral hydrogen (H I ) emission exhibits complex morphology that encodes rich information about the physics of the interstellar medium. We apply the scattering transform (ST) to characterize the H I emission structure via a set of compact and ...
Minjie Lei, S. E. Clark
doaj +1 more source