Results 31 to 40 of about 1,250,237 (300)

JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region

The Astrophysical Journal Letters, 2023
Outflows and winds launched from young stars play a crucial role in the evolution of protostars and the early stages of planet formation. However, the specific details of the mechanism behind these phenomena, including how they affect the protoplanetary ...
D. Harsono, P. Bjerkeli, J. P. Ramsey, K. M. Pontoppidan, L. E. Kristensen, J. K. Jørgensen, H. Calcutt, Z-Y. Li, A. Plunkett   +8 more
doaj   +1 more source

WHAM Observations of H-alpha Emission from High Velocity Clouds in the M, A, and C Complexes

, 1998
The first observations of the recently completed Wisconsin H-Alpha Mapper (WHAM) facility include a study of emission lines from high velocity clouds in the M, A, and C complexes, with most of the observations on the M I cloud.
Herbstmeier U., L. M. Haffner, Lu, Muller C. A., Murai T., Oort J. H., Oort J. H., Pengally R. M., R. J. Reynolds, Reynolds R. J., S. L. Tufte   +10 more
core   +1 more source

Modelling the ArH$^+$ emission from the Crab Nebula [PDF]

, 2017
We have performed combined photoionization and photodissociation region (PDR) modelling of a Crab Nebula filament subjected to the synchrotron radiation from the central pulsar wind nebula, and to a high flux of charged particles; a greatly enhanced ...
Barlow, M. J., Priestley, F. D., Viti, S.   +2 more
core   +3 more sources

Emission-line stars discovered in the UKST H-alpha survey of the Large Magellanic Cloud; Part 1: Hot stars

, 2012
We present new, accurate positions, spectral classifications, radial and rotational velocities, H-alpha fluxes, equivalent widths and B,V,I,R magnitudes for 579 hot emission-line stars (classes B0 - F9) in the Large Magellanic Cloud which include 469 new
Acke, Andrews, Andrillat, Beaulieu, Bjorkman, Bjorkman, Bland-Hawthorn, Bohannan, Bowyer, Butler, Böhm, Böhm, Cassinelli, Cohen, Corcoran, Cranmer, Dachs, Dachs, Draper, Feast, Frew, Gordon, Grebel, Grebel, Gullbring, Hamann, Hambly, Hanuschik, Hanuschik, Hartigan, Hartmann, Henize, Henyey, Herbig, Hernández, Hillenbrand, Hubert, Hubert-Delplace, Hubrig, Hughes, Hummel, Hutsemékers, Jacoby, Jacoby, Jaschek, Jaschek, Kaler, Keller, Keller, Keller, Kontizas, Kurtz, Königl, Lada, Larson, Le Borgne, Lewis, Lindsay, Lindsay, Lumb, Melchior, Mennickent, Miroshnichenko, Morgan, Murai, Muzerolle, Muzerolle, Muzerolle, Olsen, Parker, Parker, Parker, Pasquini, Pickles, Poeckert, Porter, Porter, Quentin A. Parker, Quirrenbach, Reid, Reid, Reid, Reid, Rivinius, Rivinius, Rohlfs, Sabogal, Schwering, Silaj, Silva, Skrutskie, Slettebak, Stanghellini, Struve, Szymański, Tonry, Townsend, Townsend, Turnshek, Tycner, Uchida, Udalski, Underhill, Van Winckel, Viera, Wade, Warren A. Reid, Waters, Wisniewski   +108 more
core   +1 more source

Forbidden-Line Emission from Hot H i Regions

The Astrophysical Journal, 1970
Interstellar hot low density intercloud medium in H 1 region, estimating diffuse emission in forbidden lines O 1 at 6300 A and N 1 at 5200 ...
openaire   +1 more source

UV excess measures of accretion onto young very low-mass stars and brown dwarfs [PDF]

, 2008
Low-resolution spectra from 3000-9000 AA of young low-mass stars and brown dwarfs were obtained with LRIS on Keck I. The excess UV and optical emission arising in the Balmer and Paschen continua yields mass accretion rates ranging from 2e-12 to 1e-8 Mo ...
Baraffe I., Gregory J. Herczeg, Kurosawa R., Leinert C., Lynne A. Hillenbrand, Mauas P. J. D., Rucinski S. M., Schaefer G. H., Short C. I.   +8 more
core   +2 more sources

A survey of H I 21 centimeter emission lines toward supernova remnants

The Astrophysical Journal, 1991
We performed a survey of H I 21 cm emission lines toward all known northern supernova remnants (SNRs) in order to find rapidly expanding SNR shells. Among 103 sources we detected 15 SNRs that have associated high-velocity H I gas, most of which are quite likely the gas accelerated by the supernova (SN) blast wave.
Bon-Chul Koo, Carl Heiles
openaire   +1 more source

A PERVASIVE BROAD COMPONENT IN H I EMISSION LINE PROFILES: TEMPERATURE, TURBULENCE, OR A HELIUM SIGNATURE? [PDF]

The Astronomical Journal, 2010
Gaussian analysis of interstellar neutral hydrogen emission profiles has revealed a pervasive broad component with a width on the order of 34 km s–1. When present, this component can most readily be identified in high galactic latitude directions where the H I profiles are either intrinsically weak or simple.
G. L. Verschuur, J. T. Schmelz
openaire   +1 more source

Analyses of Multiple Balmer Emission Lines from Accreting Brown Dwarfs and Very Low Mass Stars

The Astronomical Journal
A planetary growth rate, i.e., the mass accretion rate, is a fundamental parameter in planet formation, as it determines a planet's final mass. Planetary mass accretion rates have been estimated using hydrogen lines, based on the models originally ...
Jun Hashimoto, Yuhiko Aoyama
doaj   +1 more source

Two extremely metal-poor emission-line galaxies in the Sloan Digital Sky Survey

, 2006
We present spectroscopic observations with the 3.6m ESO telescope of two emission-line galaxies, J2104-0035 and J0113+0052, selected from the Data Release 4 (DR4) of the Sloan Digital Sky Survey (SDSS).
Anderson, Guseva, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, K. J. Fricke, Kniazev, Kniazev, N. G. Guseva, P. Papaderos, Pustilnik, Sargent, T. X. Thuan, Thuan, Thuan, Whitford, Y. I. Izotov   +21 more
core   +1 more source