Results 11 to 20 of about 35,694,720 (305)

LINE EMISSION FROM RADIATION-PRESSURIZED H II REGIONS. I. INTERNAL STRUCTURE AND LINE RATIOS [PDF]

The Astrophysical Journal, 2013
8 pages, 4 figures, accepted for publication in ...
Yeh, Sherry C. C., Verdolini, Silvia, Krumholz, Mark, Matzner, Christopher D., Tielens, Alexander G.G.M.   +4 more
openaire   +6 more sources

Simultaneous Cassini VIMS and UVIS observations of Saturn's southern aurora: Comparing emissions from H, H-2 and H-3(+) at a high spatial resolution [PDF]

, 2011
Here, for the first time, temporally coincident and spatially overlapping Cassini VIMS and UVIS observations of Saturn's southern aurora are presented. Ultraviolet auroral H and H-2 emissions from UVIS are compared to infrared H-3(+) emission from VIMS ...
Baines, K. H., Badman, S. V., Gustin, J., J. Gustin, S. V. Badman, R. H. Brown, Galand, M., O'Donoghue, J., Melin, H, W. R. Pryor, J. O'Donoghue, T. Stallard, Stallard, T, M. Galand, S. Miller, Galand, M, Stallard, T., Miller, S., Gustin, Jacques, H. Melin, Pryor, W. R., Baines, KH, Badman, SV, Melin, H., Brown, RH, Brown, R. H., Miller, S, Pryor, WR, K. H. Baines, O'Donoghue, J, Gustin, J   +30 more
core   +5 more sources

Stellar Inclination Angles from Be-star Hα Emission Line Profiles [PDF]

The Astrophysical Journal, 2020
We demonstrate that the angle between star's rotation axis and the observer's line-of-sight, usually called the inclination angle, can be reliably determined for Be stars via H$α$ emission-line profile fitting. We test our method on a sample of 11 Be stars with available long-baseline interferometric data from the Navy Precision Optical Interferometer~(
T. A. A. Sigut, A. K. Mahjour, C. Tycner
openaire   +2 more sources

Hα Emission Lines in High Redshift Quasars [PDF]

Symposium - International Astronomical Union, 1989
We present new data on the redshifts and Hα profiles of 18 medium to high redshift QSOs observed by us using the FIGS spectrometer at the Anglo-Australian Telescope facility and compare the data to that of the strong UV lines obtained in spectra taken at nearly the same time.
B.R. Espey, R.F. Carswell, J.A. Bailey, M.G. Smith, M.J. Ward   +4 more
openaire   +1 more source

Drivers of asymmetry in synthetic H i emission-line profiles of galaxies in the eagle simulation [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT We study the shapes of spatially integrated $\rm{H}\, \small {{I}}$ emission-line profiles of galaxies in the eagle simulation using three separate measures of the profile’s asymmetry. We show that the subset of eagle galaxies whose gas fractions and stellar masses are consistent with those in the xGASS survey also have similar $
Aditya Manuwal, Aaron D Ludlow, Adam R H Stevens, Ruby J Wright, Aaron S G Robotham   +4 more
openaire   +2 more sources

H₂ and HI Emission Line Imaging of the Ring Nebula NGC 6720 [PDF]

Symposium - International Astronomical Union, 1988
We present infrared emission line images of the v = 1 → 0 S(1) transition of molecular hydrogen and Brγ recombination line of atomic hydrogen which cover the entire extent of NGC 6720, the Ring Nebula. The maps presented here are the highest angular resolution images of these transitions yet produced for this object, and have very low relative ...
M. A. Greenhouse, T. L. Hayward, H. A. Thronson   +2 more
openaire   +1 more source

Hα emission-line stars in molecular clouds [PDF]

Astronomy & Astrophysics, 2019
A deep objective-prism survey for Hα emission stars towards the Canis Major star-forming clouds was performed. A total of 398 Hα emitters were detected, 353 of which are new detections. There is a strong concentration of these Hα emitters towards the molecular clouds surrounding the CMa OB1 association, and it is likely that these stars are young ...
Pettersson, B., Reipurth, B.
openaire   +2 more sources

J-PLUS: Measuring Hα emission line fluxes in the nearby universe [PDF]

Astronomy & Astrophysics, 2019
In this paper we aim to validate a methodology designed to obtain Hα emission line fluxes from J-PLUS photometric data. J-PLUS is a multi narrow-band filter survey carried out with the 2 deg2 field of view T80Cam camera, mounted on the JAST/T80 telescope in the OAJ, Teruel, Spain.
Logroño-García, R., Vilella-Rojo, G., López-Sanjuan, Carlos, Varela, Jesús, Viironen, Kerttu, Muniesa, D. J., Cenarro, A. J., Cristóbal-Hornillos, David, Ederoclite, Alessandro, Marín-Franch, Antonio, Moles, Mariano, Vázquez Ramió, H., Bonoli, Silvia, Díaz-García, L. A., Orsi, A., San Roman, I., Akras, S., Chies-Santos, A.L., Coelho, P. R. T., Daflon, S., Costa-Duarte, M. V., Dupke, Renato A., Galbany, Lluís, González Delgado, Rosa M., Hernández-Jiménez, J.A., Lopes De Oliveira, R., Mendes de Oliveira, Claudia, Oteo, I., Gonçalves, D. R., Sánchez-Portal, M., Schmidtobreick, L., Sodré, L.   +31 more
openaire   +2 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

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
openaire   +1 more source