☆ 4.6 Article

Probing the nuclear star cluster of galaxies with extremely large telescopes

ASTRONOMY & ASTROPHYSICS (2014)

Journal

ASTRONOMY & ASTROPHYSICS

Volume 568, Issue -, Pages -

Publisher

EDP SCIENCES S A

DOI: 10.1051/0004-6361/201424279

Keywords

instrumentation: adaptive optics; instrumentation: high angular resolution; galaxies: clusters: general; infrared: stars; methods: observational

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Astronomy & Astrophysics

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Abstract

The unprecedented sensitivity and spatial resolution of next-generation, ground-based, extremely large telescopes (ELTs) will open a completely new window on the study of resolved stellar populations. In this paper we study the feasibility of the analysis of nuclear star cluster (NSC) stellar populations with ELTs. To date, NSC stellar population studies are based on the properties of their integrated light. NSCs are in fact observed as unresolved sources even with the HST. We explore the possibility of obtaining direct estimates of the age of NSC stellar populations from the photometry of main-sequence turn-off stars. We simulated ELT observations of NSCs at different distances and with different stellar populations. Photometric measurements on each simulated image were analysed in detail and results about photometric accuracy and completeness are reported here. We found that the main sequence turn-off is detectable and therefore the age of stellar populations can be directly estimated up to 2 Mpc for old, up to 3 Mpc for intermediate-age and up to 4-5 Mpc for young stellar populations. We found that for this particular science case, the performances of TMT and E-ELT are of comparable quality.

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3D Modeling of the Molecular Gas Kinematics in Optically Selected Jellyfish Galaxies

Cecilia Bacchini, Matilde Mingozzi, Bianca M. Poggianti, Alessia Moretti, Marco Gullieuszik, Antonino Marasco, Bernardo Cervantes Sodi, Osbaldo Sanchez-Garcia, Benedetta Vulcani, Ariel Werle, Rosita Paladino, Mario Radovich

Summary: This study models the distribution and kinematics of stars and molecular gas in four late-type cluster galaxies, finding indications of ongoing ram pressure stripping in two galaxies. The stripping affects the molecular gas disk of one galaxy, but its kinematics is dominated by rotation in another. The study also suggests that the molecular gas is less severely affected by ram pressure compared to atomic and ionized gas phases.

ASTROPHYSICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

UV and Hα HST Observations of Six GASP Jellyfish Galaxies

Marco Gullieuszik, Eric Giunchi, Bianca M. Poggianti, Alessia Moretti, Claudia Scarlata, Daniela Calzetti, Ariel Werle, Anita Zanella, Mario Radovich, Callum Bellhouse, Daniela Bettoni, Andrea Franchetto, Jacopo Fritz, Yara L. Jaffe, Sean L. McGee, Matilde Mingozzi, Alessandro Omizzolo, Stephanie Tonnesen, Marc Verheijen, Benedetta Vulcani

Summary: Star-forming, H alpha-emitting clumps are found in the gaseous tails of galaxies undergoing intense ram pressure stripping in galaxy clusters, providing a unique opportunity to study star formation under extreme conditions. However, a comprehensive, high-spatial-resolution study of these systems is currently lacking.

ASTROPHYSICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies

Eric Giunchi, Marco Gullieuszik, Bianca M. Poggianti, Alessia Moretti, Ariel Werle, Claudia Scarlata, Anita Zanella, Benedetta Vulcani, Daniela Calzetti

Summary: Using Hubble Space Telescope images, we studied star-forming clumps in six galaxies undergoing ram pressure stripping. Detected in H alpha and near-UV, the clumps trace star formation on different timescales. We found that most clumps are smaller than 140 pc and the star formation is turbulence-driven and scale-free. The clumps in both the disks and tails show enhanced H alpha luminosity compared to main-sequence galaxies, indicating the influence of ram pressure.

ASTROPHYSICAL JOURNAL (2023)

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Article Astronomy & Astrophysics

The relation between morphology, star formation history, and environment in local Universe galaxies

David Perez-Millan, Jacopo Fritz, Rosa A. Gonzalez-Lopezlira, Alessia Moretti, Bernardo Cervantes Sodi, Benedetta Vulcani, Marco Gullieuszik, Gustavo Bruzual, Stephane Charlot, Daniela Bettoni

Summary: Observed properties of galaxies are influenced by their total stellar mass and morphology, as well as the environment. This study uses spectrophotometric data from the WINGS and OmegaWINGS surveys to investigate both the local and large-scale environmental effects on star formation activity in clusters. Comparisons with field galaxies reveal that local effects have a stronger impact on galaxy properties, highlighting the importance of considering morphology in understanding the influence of clusters on galaxy evolution.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)

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Article Physics, Fluids & Plasmas

Slow wind belt in the quiet solar corona

E. Antonucci, C. Downs, G. E. Capuano, D. Spadaro, R. Susino, D. Telloni, V. Andretta, V. Da Deppo, Y. De Leo, S. Fineschi, F. Frassetto, F. Landini, G. Naletto, G. Nicolini, M. Pancrazzi, M. Romoli, M. Stangalini, L. Teriaca, M. Uslenghi

Summary: The slow solar wind belt in the quiet corona, observed with the Metis coronagraph on board Solar Orbiter, is formed by a slow and dense wind stream running along the coronal current sheet, reaching speeds of 150-190 km/s at 6.8 R-?. This slow stream is separated by regions of high velocity shear from faster streams symmetrically located relative to the current sheet. The characteristics of the slow wind zone are discussed in relation to the expansion factor of open magnetic field lines and the presence of quasi-separatrix layers (S-web).

PHYSICS OF PLASMAS (2023)

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Article Andrology

Polyamines modulate mouse sperm motility

Lorena Rodriguez-Paez, Charmina Aguirre-Alvarado, German Chamorro-Cevallos, Alcantara-Farfan Veronica, Calderon-Espinosa Sandra Irel, Castillo-Perez Hugo, Carlos Armando Garcia-Perez, Guadalupe Elizabeth Jimenez-Gutierrez, Joaquin Cordero-Martinez

Summary: This study evaluated the effects of spermine, spermidine, and putrescine on sperm motility, capacitation, and acrosome reaction. The results showed that polyamines significantly decreased these parameters and may act by inhibiting the activity of sAC. Furthermore, polyamines also caused a decrease in cAMP concentration.

SYSTEMS BIOLOGY IN REPRODUCTIVE MEDICINE (2023)

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Article Astronomy & Astrophysics

A prominence eruption from the Sun to the Parker Solar Probe with multi-spacecraft observations

Tatiana Niembro, Daniel B. Seaton, Phillip Hess, David Berghmans, Vincenzo Andretta, Katharine K. Reeves, Pete Riley, Michael L. Stevens, Federico Landini, Clementina Sasso, Cis Verbeeck, Roberto Susino, Michela Uslenghi

Summary: During the early hours of April 25, 2021, the Parker Solar Probe's Solar Probe Cup detected a solar wind structure with a clear He2+/H+ density ratio above 6% for three hours. The structure, believed to originate from an erupting prominence behind the Sun, was visible to multiple instruments on the Solar-Terrestrial Relations Observatory-A and Solar Orbiter spacecraft. The associated coronal mass ejection (CME) was observed by both spacecraft before reaching the Parker Solar Probe, showing ordinary plasma signatures and a complex magnetic field. Images from the Parker Solar Probe's Wide-field Imager for Solar Probe (WISPR) revealed a structure entering the field of view prior to the in situ crossing, followed by repetitive transient structures possibly caused by flying through the CME body.

FRONTIERS IN ASTRONOMY AND SPACE SCIENCES (2023)

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