Results 11 to 20 of about 344,061 (314)

Correction of UBV Photometry for Emission Lines [PDF]

Open Astronomy, 2003
We investigate the effect on U,B,V magnitudes of the removal of emission lines from the spectra of some symbiotic stars and novae during their nebular phases.
Skopal A.
doaj   +2 more sources

Forbidden emission lines in protostellar outflows and jets with MUSE [PDF]

, 2023
Context. Forbidden emission lines in protoplanetary disks are a key diagnostic in studies of the evolution of the disk and the host star. They signal potential disk accretion or wind, outflow, or jet ejection processes of the material that affects the ...
Yuhiko Aoyama, Henning, Thomas, Ringqvist, Simon C.,, Ralf Launhardt, Müller, André, Flock, Mario, Carlos Carrasco-González, Fendt, Christian, Christian Fendt, Andrea Banzatti, Kamann, Sebastian, Aoyama, Yuhiko, Thomas Henning, Sebastian Kamann, André Müller, Banzatti, Andrea, Flores-Rivera, Lizxandra, Launhardt, Ralf, Lizxandra Flores-Rivera, Mario Flock, García Lopez, Rebeca, Roy van Boekel, Husemann, Bernd, Marleau, Gabriel-Dominique, Bernd Husemann, van Boekel, Roy, Keppler, Miriam, Rebeca García Lopez, Nicolás T. Kurtovic, Gabriel-Dominique Marleau, Carrasco-González, Carlos, Simon C. Ringqvist, Miriam Keppler, Kurtovic, Nicolás T., Ringqvist, Simon C.   +34 more
core   +1 more source

Assessing model-based carbon and oxygen abundance derivation from ultraviolet emission lines in AGNs [PDF]

, 2023
We present an adapted version of the code HII-CHI-MISTRY-UV to derive chemical abundances from emission lines in the ultraviolet, for use in narrow line regions (NLR) of active galactic nuclei (AGN). We evaluate different ultraviolet emission line ratios
Pérez Montero, Enrique, Amorín, R., Vílchez Medina, José Manuel, Pérez-Díaz, B., García-Benito, Rubén   +4 more
core   +1 more source

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

, 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
core   +1 more source

Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling [PDF]

, 2008
In this study we show how hydrogen and helium lines modelling can be used to make a diagnostic of active and eruptive prominences. One motivation for this work is to identify the physical conditions during prominence activation and eruption. Hydrogen and
N. Labrosse, Labrosse, N., Vial, J.-C., P. Gouttebroze, Gouttebroze, P., J.-C. Vial   +5 more
core   +1 more source

Off-Axis Variability of AGNs: A New Paradigm for Broad Lines and Continuum Emitting Regions

Open Astronomy, 2011
The general picture of how thermal AGNs work has become clearer in recent years but major observational puzzles threaten to undermine this picture. These puzzles include AGNs with extremely asymmetric emission line profiles, inconsistent multi-wavelength
Gaskell C. Martin
doaj   +1 more source

Corona ions from high-voltage power lines : nature of emission and dispersion [PDF]

, 2011
Positive and negative small ions, aerosol ion and number concentration and dc electric fields were monitored at an overhead high-voltage power line site. We show that the emission of corona ions was not spatially uniform along the lines and occurred from
Ling, Xuan, Morawska, Lidia, Jayaratne, Rohan   +2 more
core   +1 more source

Quasars in the 4D Eigenvector 1 Context: a stroll down memory lane

Frontiers in Astronomy and Space Sciences, 2015
Recently some pessimism has been expressed about our lack of progress in understanding quasars over more than fifty year since their discovery. It is worthwhile to look back at some of the progress that has been made – but still lies under the radar ...
Jack W. Sulentic, Paola eMarziani
doaj   +1 more source

Searching for Emission-Line Galaxies [PDF]

International Astronomical Union Colloquium, 1984
Survey methods for finding emission-line galaxies are reviewed. Observational selection effects are investigated by comparing different surveys and the limitations of the different techniques are discussed. The advantages of Ha surveys for finding low luminosity galaxies and those with low excitation emission spectra are emphasized.
openaire   +1 more source

The assembly bias of emission-line galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT The next generation of spectroscopic surveys will target emission-line galaxies (ELGs) to produce constraints on cosmological parameters. We study the large-scale structure traced by ELGs using a combination of a semi-analytical model of galaxy formation, a code that computes the nebular emission from H ii regions using the ...
Esteban Jiménez, Nelson Padilla, Sergio Contreras, Idit Zehavi, Carlton M Baugh, Álvaro Orsi   +5 more
openaire   +3 more sources