ALMA Detection of Masers and Dasars in the Hydrogen Recombination Lines of the Planetary Nebula Mz3

Autor: Zulema Abraham, Pedro P. B. Beaklini, Isabel Aleman, Raghvendra Sahai, Albert Zijlstra, Stavros Akras, Denise R. Gonçalves, Toshiya Ueta

Publikováno v: The Astrophysical Journal, Vol 974, Iss 2, p 250 (2024)

The hydrogen recombination lines H30 α , H40 α , H42 α , H50 β , and H57 γ and the underlying bremsstrahlung continuum emission were detected with ALMA in the bipolar nebula Mz3. The source was not spatially resolved, but the velocity profile of

Externí odkaz: https://doaj.org/article/19665bd14fc54c4e98d3c70d2e31517e

The Web of Micro-Structures in IC 4593

Autor: M. Belén Mari, Denise R. Gonçalves, Stavros Akras

Publikováno v: Galaxies, Vol 8, Iss 2, p 46 (2020)

In addition to large-scale structures, planetary nebulae (PNe) show small-scale structures that emit mainly in low-ionization species such as [N ii], [S ii], [O ii], and [O i], known as LISs. Here, we present the analysis of optical long-slit spectra

Externí odkaz: https://doaj.org/article/9931c0e272714b6f97d196f2da8aac70

Low-ionization structures in planetary nebulae – II. Densities, temperatures, abundances, and excitation of six PNe

Autor: M Belén Mari, Denise R Gonçalves, Stavros Akras

Publikováno v: Monthly Notices of the Royal Astronomical Society. 518:3908-3934

Here we present the spatially resolved study of six Galactic planetary nebulae (PNe), namely IC 4593, Hen 2-186, Hen 2-429, NGC 3918, NGC 6543, and NGC 6905, from intermediate-resolution spectra of the 2.5 m Isaac Newton Telescope and the 1.54 m Dani

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::305a8e32fa85a9ef2fb41310d813b411
https://doi.org/10.1093/mnras/stac2729

The messy death of a multiple star system and the resulting planetary nebula as observed by JWST

Autor: Orsola De Marco, Muhammad Akashi, Stavros Akras, Javier Alcolea, Isabel Aleman, Philippe Amram, Bruce Balick, Elvire De Beck, Eric G. Blackman, Henri M. J. Boffin, Panos Boumis, Jesse Bublitz, Beatrice Bucciarelli, Valentin Bujarrabal, Jan Cami, Nicholas Chornay, You-Hua Chu, Romano L. M. Corradi, Adam Frank, D. A. García-Hernández, Jorge García-Rojas, Guillermo García-Segura, Veronica Gómez-Llanos, Denise R. Gonçalves, Martín A. Guerrero, David Jones, Amanda I. Karakas, Joel H. Kastner, Sun Kwok, Foteini Lykou, Arturo Manchado, Mikako Matsuura, Iain McDonald, Brent Miszalski, Shazrene S. Mohamed, Ana Monreal-Ibero, Hektor Monteiro, Rodolfo Montez, Paula Moraga Baez, Christophe Morisset, Jason Nordhaus, Claudia Mendes de Oliveira, Zara Osborn, Masaaki Otsuka, Quentin A. Parker, Els Peeters, Bruno C. Quint, Guillermo Quintana-Lacaci, Matt Redman, Ashley J. Ruiter, Laurence Sabin, Raghvendra Sahai, Carmen Sánchez Contreras, Miguel Santander-García, Ivo Seitenzahl, Noam Soker, Angela K. Speck, Letizia Stanghellini, Wolfgang Steffen, Jesús A. Toalá, Toshiya Ueta, Griet Van de Steene, Hans Van Winckel, Paolo Ventura, Eva Villaver, Wouter Vlemmings, Jeremy R. Walsh, Roger Wesson, Albert A. Zijlstra

Publikováno v: De marco, O, Akashi, M, Akras, S, Alcolea, J, Aleman, I, Amram, P, Balick, B, De beck, E, Blackman, E G, Boffin, H M J, Boumis, P, Bublitz, J, Bucciarelli, B, Bujarrabal, V, Cami, J, Chornay, N, Chu, Y, Corradi, R L M, Frank, A, García-Hernández, D A, García-Rojas, J, García-Segura, G, Gómez-Llanos, V, Gonçalves, D R, Guerrero, M A, Jones, D, Karakas, A I, Kastner, J H, Kwok, S, Lykou, F, Manchado, A, Matsuura, M, Mcdonald, I, Miszalski, B, Mohamed, S S, Monreal-Ibero, A, Monteiro, H, Montez, R, Baez, P M, Morisset, C, Nordhaus, J, Mendes de oliveira, C, Osborn, Z, Otsuka, M, Parker, Q A, Peeters, E, Quint, B C, Quintana-Lacaci, G, Redman, M, Ruiter, A J, Sabin, L, Sahai, R, Contreras, C S, Santander-García, M, Seitenzahl, I, Soker, N, Speck, A K, Stanghellini, L, Steffen, W, Toalá, J A, Ueta, T, Van de steene, G, Van winckel, H, Ventura, P, Villaver, E, Vlemmings, W, Walsh, J R, Wesson, R & Zijlstra, A A 2022, ' The messy death of a multiple star system and the resulting planetary nebula as observed by JWST ', Nature Astronomy, vol. 6, no. 12, pp. 1421-1432 . https://doi.org/10.1038/s41550-022-01845-2
Nature Astronomy, 6, 1421-1432
Nature Astronomy
Nature Astronomy, 2022, 6, pp.1421-1432. ⟨10.1038/s41550-022-01845-2⟩

Full list of authors: De Marco, Orsola; Akashi, Muhammad; Akras, Stavros; Alcolea, Javier; Aleman, Isabel; Amram, Philippe; Balick, Bruce; De Beck, Elvire; Blackman, Eric G.; Boffin, Henri M. J.; Boumis, Panos; Bublitz, Jesse; Bucciarelli, Beatrice;

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a9b0134f1ad6301a9987c1432d5981f
https://lirias.kuleuven.be/handle/20.500.12942/718332

H2 emission in the low-ionization structures of the planetary nebulae NGC 7009 and NGC 6543

Autor: Stavros Akras, Denise R. Gonçalves, Gerardo Ramos-Larios, Isabel Aleman

Publikováno v: Monthly Notices of the Royal Astronomical Society. 493:3800-3810

Despite the many studies in the last decades, the low-ionisation structures (LISs) of planetary nebulae (PNe) still hold several mysteries. Recent imaging surveys have demonstrated that LISs are composed of molecular gas. Here we report H$_2$ emissio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72d8a1506c8846b8a98617c9d8d1c470
https://doi.org/10.1093/mnras/staa515