Results 21 to 30 of about 28,808 (222)

First Results from a Panchromatic HST/WFC3 Imaging Study of the Young, Rapidly Evolving Planetary Nebulae NGC 7027 and NGC 6302

Galaxies, 2020
We present the first results from comprehensive, near-UV-to-near-IR Hubble Space Telescope Wide Field Camera 3 (WFC3) emission-line imaging studies of two young planetary nebulae (PNe), NGC 7027 and NGC 6302.
Joel H. Kastner, Jesse Bublitz, Bruce Balick, Rodolfo Montez, Adam Frank, Eric Blackman   +5 more
doaj   +1 more source

New groups of planetary nebulae with peculiar dust chemistry towards the Galactic bulge

, 2010
We investigate Galactic bulge planetary nebulae without emission-line central stars for which peculiar infrared spectra have been obtained with the Spitzer Space Telescope, including the simultaneous signs of oxygen and carbon based dust.
Blöcker, Cerrigone, Chiappini, Cohen, Cohen, Costa, Cuisinier, D. A. García-Hernández, de Marco, Durand, Escudero, Escudero, Exter, García-Hernández, García-Lario, Gesicki, Gesicki, Gesicki, Gutenkunst, Górny, Górny, Górny, Górny, Herwig, Houck, Hultzsch, J. V. Perea-Calderón, Köppen, Leisy, Miszalski, Molster, P. García-Lario, Perea-Calderón, Peña, R. Szczerba, Ratag, Richer, Robinson, S. K. Górny, Samland, Stanghellini, Stasinska, Stasinska, Szczerba, Tylenda, Uttenthaler, van Hoof, Wang, Waters, Waters, Werner, Zoccali   +51 more
core   +1 more source

Circumgalactic Lyα Nebulae in Overdense Quasar Pair Regions Observed with the Palomar Cosmic Web Imager

The Astrophysical Journal, 2023
The recent discovery of enormous Ly α nebulae (ELANe), characterized by physical extents >200 kpc and Ly α luminosities >10 ^44 erg s ^−1 , provides a unique opportunity to study the intergalactic medium and circumgalactic medium in distant galaxies ...
Jessica S. Li, Carlos J. Vargas, Donal O’Sullivan, Erika Hamden, Zheng Cai, Mateusz Matuszewski, Christopher Martin, Miriam Keppler, Haeun Chung, Nicole Melso, Shiwu Zhang   +10 more
doaj   +1 more source

Catalogue of candidate emission-line objects in the Small Magellanic Cloud [PDF]

, 1999
H\alpha and [O III] narrow band, wide field (7 * 7 degree), CCD images of the Small Magellanic Cloud were compared and a catalogue of candidate planetary nebulae and H\alpha emission-line stars was compiled.
Bessell, Michael S., Murphy, Michael T.
core   +3 more sources

Backscattering and Line Broadening in Orion

The Astronomical Journal, 2022
Examination of emission lines in high-velocity-resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region.
C. R. O’Dell, G. J. Ferland, J. E. Méndez-Delgado   +2 more
doaj   +1 more source

A CO Survey of Young Planetary Nebulae

, 2005
We report the results of a sensitive survey of young planetary nebulae in the CO J=2-1 line that significantly increases the available data on warm, dense, molecular gas in the early phases of planetary nebula formation.
Aaquist O. B., Bachiller R., Bachiller R., Durand S., Gesicki K., Gomez Y., Gussie G. T., Huggins P. J., P. Cox, P. J. Huggins, P. Planesas, R. Bachiller, T. Forveille, Webster B. L., Weinberger R., Zijlstra A. A.   +15 more
core   +3 more sources

Submillimeter H2O masers in water-fountain nebulae [PDF]

, 2014
We report the first detection of submillimeter water maser emission toward water-fountain nebulae, which are post-AGB stars that exhibit high-velocity water masers.
Franco-Hernández, R., Garay, G., Pérez-Sánchez, A. F., Tafoya, D., Vlemmings, W. H. T.   +4 more
core   +2 more sources

A study of four multipolar planetary nebulae in the Galactic bulge

Astronomy & Astrophysics
We present infrared (IR) spectroscopic and optical morphological analyses of four multipolar young planetary nebulae (PNe) located in the Galactic bulge (GB) to investigate their dust characteristics and complex multi-lobed structures.
Wen Shi-Bo, Wang Yong-Zhi, Hsia Chih-Hao, Yeh Sangchun, Liu Jian-Zhong, Kang Xiao-Xi   +5 more
doaj   +1 more source

Analysis of Multiple Shell Planetary Nebulae Based on HST/WFPC2 Extended 2D Diagnostic Diagrams

Galaxies, 2018
The investigation of gaseous nebulae, emitting in forbidden lines, is often based extensively on diagnostic diagrams. The special physics of these lines often allows for disentangling with a few line ratios normally coupled thermodynamic parameters like ...
Daniela Barría, Stefan Kimeswenger
doaj   +1 more source

Multiwavelength Observations of Pulsar Wind Nebulae

, 2010
The extended nebulae formed as pulsar winds expand into their surroundings provide information about the composition of the winds, the injection history from the host pulsar, and the material into which the nebulae are expanding. Observations from across
A Lemiere, A Pellizzoni, A Spitkovsky, AA Abdo, BM Gaensler, BM Gaensler, DA Frail, DA Green, DK Milne, E Giacani, E Swaluw van der, EV Gotthelf, F Bocchino, F Pacini, FA Aharonian, FA Aharonian, FR Stephenson, GC Rudie, J Fang, JD Gelfand, JM Blondin, MC Begelman, MF Bietenholz, N Bucciantini, OC Jager de, P Slane, P Slane, P Slane, PA Shaver, RA Chevalier, RA Chevalier, S Funk, SM LaMassa, SP Reynolds, T Temim, T Temim, V Mangano, YA Shibanov, YE Lyubarsky   +38 more
core   +1 more source