Results 31 to 40 of about 35,694,720 (305)

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

Behaviour of Hα and H Ca II Emission Lines in a Prominence Before and During its Dynamic “Disparition Brusque” [PDF]

International Astronomical Union Colloquium, 1998
AbstractHα and H Ca II emission lines in a limb quiescent prominence (QP) undergoing destabilization are studied. The temperature, line-of-sight velocity and micro-turbulence are obtained in one of the prominence legs, just before and during the prominence activation.
M.S. Madjarska, V.N. Dermendjiev, Z. Mouradian, P. Kotrč   +3 more
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The IPHAS catalogue of H alpha emission-line sources in the northern Galactic plane [PDF]

, 2008
We present a catalogue of point-source H alpha emission-line objects selected from the INT/WFC Photometric Ha Survey (IPHAS) of the northern Galactic plane. The catalogue covers the magnitude range 13 13) emission-line objects than were previously known
Drew, J. E., Steeghs, D., Mampaso, A., Gaensicke, B. T., Witham, Andrew, Knigge, C., Groot, P., Greimel, R., Drew, J.E., Gänsicke, B.T., Groot, P. J., Knigge, Christian, Witham, A.R., Groot, P.J.   +13 more
core   +1 more source

H Emission-Line Stars in Molecular Clouds. I. The NGC 2264 Region

The Astronomical Journal, 2004
We present a deep survey of H? emission-line stars in the NGC 2264 region using wide-field objective prism films. We find 357 H? emission-line stars, of which 113 were previously detected, within an area of 3? ? 3? centered on the Cone Nebula, with a majority of stars being concentrated in a dense cluster at the center of the region. We present a large-
Bo Reipurth, Bertil Pettersson, Tina Armond, John Bally, Luiz Paulo R. Vaz   +4 more
openaire   +1 more source

Visibility of old supernova remnants in H i 21-cm emission line [PDF]

Monthly Notices of the Royal Astronomical Society, 2004
We estimate the number of old, radiative supernova remnants (SNRs) detectable in HI 21-cm emission line in the Galaxy. According to our result, the contamination due to the Galactic background HI emission limits the number of visible SNRs to 270, or 9% of the total HI SNRs. The telescope sensitivity further limits the number. We compare the result with
Koo, Bon-Chul, Kang, Ji-hyun
openaire   +2 more sources

The HST Sample of Radio-Loud Quasars: Emission Lines from Lyα to Hβ [PDF]

International Astronomical Union Colloquium, 1997
We have obtained HST and ground-based spectrophotometry of a sample of ~61 radio-loud quasars from shortward of Lyα to longward of Hβ. The aim was to investigate the dependence of quasar properties on orientation of the central engine axis to the observer’s line of sight.
Beverley J. Wills, M.S. Brotherton, D. Wills, K.L. Thompson, J. A. Baldwin, R. F. Carswell, I.W.A. Browne, H. Netzer, P.J. Francis   +8 more
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Mapping H i 21-cm in the Klemola 31 group at z = 0.029: emission and absorption towards PKS 2020-370

, 2022
International audienceWe present MeerKAT Absorption Line Survey (MALS) observations of the H i gas in the Klemola 31 galaxy group (z = 0.029), located along the line of sight to the radio-loud quasar PKS 2020-370 (z = 1.048).
Maina, E. K., Combes, F., Petitjean, P., Krogager, J.-K., Balashev, S., A., Wagenveld, J. D., Maina, E., K., Mohapatra, Abhisek, Noterdaeme, P., Wagenveld, J., D., Balashev, S. A., Maina, E.,, Balashev, S.,, Krogager, J. -K., Chen, Hsiao-Wen, Combes, Francoise, Momjian, E., Wagenveld, J.,, Deka, P., Józsa, G. I. G., Srianand, R., Józsa, G., I. G., Gupta, N., Józsa, G.,   +23 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

Broad line emission from iron K- and L-shell transitions in the active galaxy 1H 0707-495

, 2009
Since the 1995 discovery of the broad iron K-line emission from the Seyfert galaxy MCG-6-30-15 (ref. 1), broad iron K lines have been found in emission from several other Seyfert galaxies, from accreting stellar-mass black holes and even from accreting ...
T. Boller, Reynolds, C., Tanaka, Y, Larsson, J., Reynolds, C.S., Boller, T., Zoghbi, A., Y. Tanaka, G. Miniutti, Brandt, W.N., Zoghbi, A, Blustin, A., Reis, R.C., W. N. Brandt, Ponti, G, Ross, R., Uttley, P., Cadallero-Garcia, M., C. S. Reynolds, Blustin, A. J., Caballero-Garcia, M.D., Young, A.J., P. Uttley, Reynolds, C.S, Miller, J.M., Ross, R.R., A. C. Fabian, Uttley, P, Tanaka, Y., Young, A.J, L. C. Gallo, J. M. Miller, Miniutti, G, Brandt, W. N., G. Ponti, Fabian, A.C., Brandt, W, Blustin, A.J, Reis, R., Reis, R. C., Blustin, A.J., A. J. Blustin, J. Larsson, Ross, R. R., Miller, J.M, A. Zoghbi, R. C. Reis, M. D. Caballero-Garcia, A. J. Young, Ross, R.R, Miller, Jon M., Brandt, W., Gallo, L. C., Fabian, A., Caballero-Garcia, M. D., Ponti, G., Miniutti, G., Larsson, J, R. R. Ross, Gallo, L., Young, A., Fabian, A.C, Fabian, Andy C., Caballero-Garcia, M.D, Boller, T, Reynolds, Christopher S., Miniutti, Giovanni, Gallo, L.C., Miller, J., Reis, R.C, Young, A. J.   +70 more
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The evolution of emission lines in H II galaxies

, 2001
We constructed diagnostic diagrams using emission line ratios and equivalent widths observed in several independent samples of H ...
D. Schaerer, G. Stasińska, C. Leitherer
core   +1 more source