Search

Your search keyword '"Józsa, Gyula I. G."' showing total 17 results
Start Over Author "Józsa, Gyula I. G." Journal monthly notices of the royal astronomical society
17 results on '"Józsa, Gyula I. G."'

1. MeerKAT discovery of a double radio relic and odd radio circle: connecting cluster and galaxy merger shocks

Author

Koribalski, Bärbel S, primary, Veronica, Angie, additional, Dolag, Klaus, additional, Reiprich, Thomas H, additional, Brüggen, Marcus, additional, Heywood, Ian, additional, Andernach, Heinz, additional, Dettmar, Ralf-Jürgen, additional, Hoeft, Matthias, additional, Zhang, Xiaoyuan, additional, Bulbul, Esra, additional, Garrel, Christian, additional, Józsa, Gyula I G, additional, and English, Jayanne, additional

Published
2024
Full Text
View/download PDF

2. Tidally offset neutral gas in Lyman continuum emitting galaxy Haro 11

Author

Le Reste, Alexandra, primary, Cannon, John M, additional, Hayes, Matthew J, additional, Inoue, John L, additional, Kepley, Amanda A, additional, Melinder, Jens, additional, Menacho, Veronica, additional, Adamo, Angela, additional, Bik, Arjan, additional, Ejdetjärn, Timmy, additional, Józsa, Gyula I G, additional, Östlin, Göran, additional, and Taft, Sarah H, additional

Published
2023
Full Text
View/download PDF

3. Tidally offset neutral gas in Lyman continuum emitting galaxy Haro 11.

Author

Le Reste, Alexandra, Cannon, John M, Hayes, Matthew J, Inoue, John L, Kepley, Amanda A, Melinder, Jens, Menacho, Veronica, Adamo, Angela, Bik, Arjan, Ejdetjärn, Timmy, Józsa, Gyula I G, Östlin, Göran, and Taft, Sarah H

Subjects
INTERSTELLAR medium, IONIZING radiation, GALAXIES, RADIO galaxies, RADIO lines
Abstract

Around 400 Myr after the big bang, the ultraviolet emission from star-forming galaxies reionized the Universe. Ionizing radiation (Lyman continuum, LyC) is absorbed by cold neutral hydrogen gas (H  i) within galaxies, hindering the escape of LyC photons. Since the H  i reservoir of LyC emitters has never been mapped, major uncertainties remain on how LyC photons escape galaxies and ionize the intergalactic medium. We have directly imaged the neutral gas in the nearby reionization-era analogue galaxy Haro 11 with the 21 cm line to identify the mechanism enabling ionizing radiation escape. We find that merger-driven interactions have caused a bulk offset of the neutral gas by about |$6\,$| kpc from the centre of the galaxy, where LyC emission production sites are located. This could facilitate the escape of ionizing radiation into our line of sight. Galaxy interactions can cause both elevated LyC production and large-scale displacement of H  i from the regions where these photons are produced. They could contribute to the anisotropic escape of LyC radiation from galaxies and the reionization of the Universe. We argue for a systematic assessment of the effect of environment on LyC production and escape. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

4. NGC 1436: the making of a lenticular galaxy in the Fornax cluster

Author

Loni, Alessandro, primary, Serra, Paolo, additional, Sarzi, Marc, additional, Józsa, Gyula I G, additional, Anta, Pablo M Galán−de, additional, Zabel, Nikki, additional, Kleiner, Dane, additional, Maccagni, Filippo M, additional, Molnár, Daniel, additional, Ramatsoku, Mpati, additional, Loi, Francesca, additional, Corsini, Enrico M, additional, Pisano, D J, additional, Kamphuis, Peter, additional, Davis, Timothy A, additional, de Blok, W J G, additional, Dettmar, Ralf J, additional, Falcon-Barroso, Jesus, additional, Iodice, Enrichetta, additional, Lara-López, Maritza A, additional, Loubser, S Ilani, additional, Morokuma-Matsui, Kana, additional, Peletier, Reynier, additional, Pinna, Francesca, additional, Poci, Adriano, additional, Smith, Matthew W L, additional, Trager, Scott C, additional, and van de Ven, Glenn, additional

Published
2023
Full Text
View/download PDF

5. Emergence of a new H i 21-cm absorption component at z ∼ 1.1726 towards the γ-ray blazar PKS 2355-106

Author

Srianand, Raghunathan, primary, Gupta, Neeraj, additional, Petitjean, Patrick, additional, Momjian, Emmanuel, additional, Balashev, Sergei A, additional, Combes, Françoise, additional, Chen, Hsiao-Wen, additional, Krogager, Jens-Kristian, additional, Noterdaeme, Pasquier, additional, Rahmani, Hadi, additional, Baker, Andrew J, additional, Emig, Kimberly L, additional, Józsa, Gyula I G, additional, Kloeckner, Hans-Rainer, additional, and Moodley, Kavilan, additional

Published
2022
Full Text
View/download PDF

6. The extended H i halo of NGC 4945 as seen by MeerKAT

Author

Ianjamasimanana, Roger, primary, Koribalski, B S, additional, Józsa, Gyula I G, additional, Kamphuis, Peter, additional, de Blok, W J G, additional, Kleiner, Dane, additional, Namumba, Brenda, additional, Carignan, Claude, additional, Dettmar, Ralf-Jürgen, additional, Serra, Paolo, additional, Smirnov, Oleg M, additional, Thorat, Kshitij, additional, Hugo, Benjamin V, additional, Ramaila, Athanaseus J T, additional, Maina, Eric, additional, Maccagni, Filippo M, additional, Makhathini, Sphesihle, additional, Andati, Lexy A L, additional, Molnár, Dániel Cs, additional, Perkins, Simon, additional, Loi, Francesca, additional, Ramatsoku, Mpati, additional, and Atemkeng, Marcellin, additional

Published
2022
Full Text
View/download PDF

8. Anomalous gas in ESO 149-G003: a MeerKAT-16 view

Author

Józsa, Gyula I G, primary, Thorat, Kshitij, additional, Kamphuis, Peter, additional, Sebokolodi, Lerato, additional, Maina, Eric K, additional, Wang, Jing, additional, Pieterse, Daniëlle L A, additional, Groot, Paul, additional, Ramaila, Athanaseus J T, additional, Serra, Paolo, additional, Andati, Lexy A L, additional, de Blok, W J G, additional, Hugo, Benjamin V, additional, Kleiner, Dane, additional, Maccagni, Filippo M, additional, Makhathini, Sphesihle, additional, Molnár, Dániel Cs, additional, Ramatsoku, Mpati, additional, Smirnov, Oleg M, additional, Bloemen, Steven, additional, Paterson, Kerry, additional, Vreeswijk, Paul, additional, McBride, Vanessa, additional, Klein-Wolt, Marc, additional, Woudt, Patrick, additional, Körding, Elmar, additional, Le Poole, Rudolf, additional, Goedhart, Sharmila, additional, Passmoor, Sean S, additional, Serylak, Maciej, additional, and Dettmar, Ralf-Jürgen, additional

Published
2020
Full Text
View/download PDF

9. MeerKAT-16 H i observation of the dIrr galaxy WLM

Author

Ianjamasimanana, Roger, primary, Namumba, Brenda, additional, Ramaila, Athanaseus J T, additional, Saburova, Anna S, additional, Józsa, Gyula I G, additional, Myburgh, Talon, additional, Thorat, Kshitij, additional, Carignan, Claude, additional, Maina, Eric, additional, de Blok, W J G, additional, Andati, Lexy A L, additional, Hugo, Benjamin V, additional, Kleiner, Dane, additional, Kamphuis, Peter, additional, Serra, Paolo, additional, Smirnov, Oleg M, additional, Maccagni, Filippo M, additional, Makhathini, Sphesihle, additional, Molnár, Dániel Cs, additional, Perkins, Simon, additional, Ramatsoku, Mpati, additional, and White, Sarah V, additional

Published
2020
Full Text
View/download PDF

10. Anomalous gas in ESO 149-G003: a MeerKAT-16 view.

Author

Józsa, Gyula I G, Thorat, Kshitij, Kamphuis, Peter, Sebokolodi, Lerato, Maina, Eric K, Wang, Jing, Pieterse, Daniëlle L A, Groot, Paul, Ramaila, Athanaseus J T, Serra, Paolo, Andati, Lexy A L, de Blok, W J G, Hugo, Benjamin V, Kleiner, Dane, Maccagni, Filippo M, Makhathini, Sphesihle, Molnár, Dániel Cs, Ramatsoku, Mpati, Smirnov, Oleg M, and Bloemen, Steven

Subjects
*OPTICAL telescopes, *RADIO telescopes, *GASES, *KINEMATICS, *GALACTIC dynamics, *DWARF galaxies
Abstract

ESO 149-G003 is a close-by, isolated dwarf irregular galaxy. Previous observations with the ATCA indicated the presence of anomalous neutral hydrogen (⁠|$\rm{H{\small I}}$|⁠) deviating from the kinematics of a regularly rotating disc. We conducted follow-up observations with the MeerKAT radio telescope during the 16-dish Early Science programme as well as with the MeerLICHT optical telescope. Our more sensitive radio observations confirm the presence of anomalous gas in ESO 149-G003, and further confirm the formerly tentative detection of an extraplanar |$\rm{H{\small I}}$| component in the galaxy. Employing a simple tilted-ring model, in which the kinematics is determined with only four parameters but including morphological asymmetries, we reproduce the galaxy's morphology, which shows a high degree of asymmetry. By comparing our model with the observed |$\rm{H{\small I}}$|⁠ , we find that in our model, we cannot account for a significant (but not dominant) fraction of the gas. From the differences between our model and the observed data cube, we estimate that at least 7–8 per cent of the |$\rm{H{\small I}}$| in the galaxy exhibits anomalous kinematics, while we estimate a minimum mass fraction of less than 1 per cent for the morphologically confirmed extraplanar component. We investigate a number of global scaling relations and find that, besides being gas-dominated with a neutral gas-to-stellar mass ratio of 1.7, the galaxy does not show any obvious global peculiarities. Given its isolation, as confirmed by optical observations, we conclude that the galaxy is likely currently acquiring neutral gas. It is either re-accreting gas expelled from the galaxy or accreting pristine intergalactic material. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

15. The Bluedisks project, a study of unusually H i-rich galaxies – I. H i sizes and morphology

Author

Wang, Jing, primary, Kauffmann, Guinevere, additional, Józsa, Gyula I. G., additional, Serra, Paolo, additional, van der Hulst, Thijs, additional, Bigiel, Frank, additional, Brinchmann, Jarle, additional, Verheijen, M. A. W., additional, Oosterloo, Tom, additional, Wang, Enci, additional, Li, Cheng, additional, den Heijer, Milan, additional, and Kerp, Jürgen, additional

Published
2013
Full Text
View/download PDF

16. An HI view of galaxy conformity: HI-rich environment around HI-excess galaxies.

Author

Jing Wang, Serra, Paolo, Józsa, Gyula I. G., Koribalski, Bärbel, van der Hulst, Thijs, Kamphuis, Peter, Cheng Li, Jian Fu, Ting Xiao, Overzier, Roderik, Wieringa, Mark, and Wang, Enci

Subjects
INTERSTELLAR medium, GALAXY spectra, STELLAR mass, ACCRETION (Astrophysics), RADIO telescopes
Abstract

Using data taken as part of the Bluedisk project, we study the connection between neutral hydrogen (H I) in the environment of spiral galaxies and that in the galaxies themselves. We measure the total H I mass present in the environment in a statistical way by studying the distribution of noise peaks in the H I data cubes obtained for 40 galaxies observed with Westerbork Synthesis Radio Telescope. We find that galaxies whose H I mass fraction is high relative to standard scaling relations have an excess H I mass in the surrounding environment as well. Gas in the environment consists of gas clumps which are individually below the detection limit of our H I data. These clumps may be hosted by small satellite galaxies and/or be the high-density peaks of a more diffuse gas distribution in the intergalactic medium. We interpret this result as an indication for a picture in which the [Math Processing Error]-rich central galaxies accrete gas from an extended gas reservoir present in their environment. [ABSTRACT FROM AUTHOR]

Published
2015
Full Text
View/download PDF

17. An observational and theoretical view of the radial distribution of H i gas in galaxies.

Author

Wang, Jing, Fu, Jian, Aumer, Michael, Kauffmann, Guinevere, Józsa, Gyula I. G., Serra, Paolo, Huang, Mei-ling, Brinchmann, Jarle, van der Hulst, Thijs, and Bigiel, Frank

Subjects
ASTRONOMICAL observations, RADIAL distribution function, RADIAL velocity of galaxies, GALACTIC evolution, GALAXY spectra, DARK matter
Abstract

We analyse the radial distribution of H i gas for 23 disc galaxieswith unusually high H i content from the Bluedisk sample, along with a similar-sized sample of ‘normal’ galaxies. We propose an empirical model to fit the radial profile of the H i surface density, an exponential function with a depression near the centre. The radial H i surface density profiles are very homogeneous in the outer regions of the galaxy; the exponentially declining part of the profile has a scalelength of ∼0.18 R1, where R1 is the radius where the column density of the H i is 1 M⊙ pc−2. This holds for all galaxies, independent of their stellar or H i mass. The homogenous outer profiles, combined with the limited range in H i surface density in the non-exponential inner disc, results in the well-known tight relation between H i size and H i mass. By comparing the radial profiles of the H i-rich galaxies with those of the control systems, we deduce that in about half the galaxies, most of the excess gas lies outside the stellar disc, in the exponentially declining outer regions of the H i disc. In the other half, the excess is more centrally peaked. We compare our results with existing smoothed particle hydrodynamical simulations and semi-analytic models of disc galaxy formation in a Λ cold dark matter universe. Both the hydro simulations and the semi-analytic models reproduce the H i surface density profiles and the H i size–mass relation without further tuning of the simulation and model inputs. In the semi-analytic models, the universal shape of the outer H i radial profiles is a consequence of the assumption that infalling gas is always distributed exponentially. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results