Results 1 to 10 of about 6,393 (178)

The State of the Molecular Gas in Post-starburst Galaxies

The Astrophysical Journal, 2023
The molecular gas in galaxies traces both the fuel for star formation and the processes that can enhance or suppress star formation. Observations of the molecular gas state can thus point to when and why galaxies stop forming stars.
K. Decker French, Adam Smercina, Kate Rowlands, Akshat Tripathi, Ann I. Zabludoff, John-David T. Smith, Desika Narayanan, Yujin Yang, Yancy Shirley, Katey Alatalo   +9 more
doaj   +4 more sources

An Explanation for the Overrepresentation of Tidal Disruption Events in Post-starburst Galaxies

The Astrophysical Journal, 2023
Tidal disruption events (TDEs) provide a valuable probe for studying the dynamics of stars in the nuclear environments of galaxies. Recent observations show that TDEs are strongly overrepresented in post-starburst or “green valley” galaxies, although the
Mengye Wang, Yiqiu Ma, Qingwen Wu, Ning Jiang   +3 more
doaj   +3 more sources

Chemical abundances in the dwarf galaxy NGC 4163 based on the nebular and auroral emission lines

Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022
Abstract We constructed an oxygen abundance map and N/O ratio map of the unusually low excitation dwarf irregular galaxy NGC 4163 based on publicly available spectroscopy obtained by the MaNGA survey. We detected auroral emission line [O II]λλ$$ \lambda \lambda $$7320,7330 which allows us to measure chemical abundance by direct Te$$ {\mathrm{T}}_e ...
I. A. Zinchenko, L. S. Pilyugin
wiley   +1 more source

Merger Signatures are Common, but not Universal, in Massive, Recently Quenched Galaxies at z ∼ 0.7

The Astrophysical Journal, 2023
We present visual classifications of merger-induced tidal disturbances in 143 M _* ∼ 10 ^11 M _⊙ post-starburst galaxies at z ∼ 0.7 identified in the $\mathrm{SQuIGG}\vec{L}{\rm{E}}$ Sample.
Margaret E. Verrico, David J. Setton, Rachel Bezanson, Jenny E. Greene, Katherine A. Suess, Andy D. Goulding, Justin S. Spilker, Mariska Kriek, Robert Feldmann, Desika Narayanan, Vincenzo Donofrio, Gourav Khullar   +11 more
doaj   +1 more source

An Extremely Compact, Low-mass Galaxy on its Way to Quiescence at z = 5.2

The Astrophysical Journal Letters, 2023
We report the discovery of a low-mass z = 5.200 ± 0.002 galaxy that is in the process of ceasing its star formation. The galaxy, MACS0417-z5BBG, is multiply imaged with magnification factors ∼40 by the galaxy cluster MACS J0417.5-1154, observed as part ...
Victoria Strait, Gabriel Brammer, Adam Muzzin, Guillaume Desprez, Yoshihisa Asada, Roberto Abraham, Maruša Bradač, Kartheik G. Iyer, Nicholas Martis, Lamiya Mowla, Gaël Noirot, Ghassan T. E. Sarrouh, Marcin Sawicki, Chris Willott, Katriona Gould, Tess Grindlay, Jasleen Matharu, Gregor Rihtaršič   +17 more
doaj   +1 more source

2022 report from the Auger-TA working group on UHECR arrival directions [PDF]

EPJ Web of Conferences, 2023
After over 60 years, the powerful engines that accelerate ultra-high-energy cosmic rays (UHECRs) to the formidable energies at which we observe them from Earth remain mysterious.
di Matteo A., Anchordoqui L., Bister T., de Almeida R., Deligny O., Deval L., Farrar G., Giaccari U., Golup G., Higuchi R., Kim J., Kuznetsov M., Mariş I., Rubtsov G., Tinyakov P.   +14 more
doaj   +1 more source

Growth of Accreting Supermassive Black Hole Seeds and Neutrino Radiation

Journal of Astrophysics, Volume 2015, Issue 1, 2015., 2015
In the framework of microscopic theory of black hole (MTBH), which explores the most important processes of rearrangement of vacuum state and spontaneous breaking of gravitation gauge symmetry at huge energies, we have undertaken a large series of numerical simulations with the goal to trace an evolution of the mass assembly history of 377 plausible ...
Gagik Ter-Kazarian, Gary Wegner
wiley   +1 more source

Properties of the Hii Regions Derived Using Integral Field Spectroscopy

Advances in Astronomy, Volume 2013, Issue 1, 2013., 2013
Here we review some of our more recent results on the observed properties of Hii regions using Integral Field Spectroscopy. In particular, we illustrate the use of this technique to study in detail the ionization conditions across the nebulae for galactic Hii regions (focused on the Orion Nebula) and the statistical study of large samples of ...
Sebastian F. Sánchez, Polychronis Papaderos   +1 more
wiley   +1 more source

M94 as a Unique Testbed for Black Hole Mass Estimates and AGN Activity at Low Luminosities

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
We discuss the peculiar nature of the nucleus of M94 (NGC 4736) in the context of new measurements of the broad Hα emission from HST‐STIS observations. We show that this component is unambiguously associated with the high‐resolution X‐ray, radio, and variable UV sources detected at the optical nucleus of this galaxy.
Anca Constantin, Anil C. Seth, Antonis Georgakakis   +2 more
wiley   +1 more source

Star Formation Histories of Dwarf Galaxies from the Colour‐Magnitude Diagrams of Their Resolved Stellar Populations

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
In this tutorial paper we summarize how the star formation (SF) history of a galactic region can be derived from the colour‐magnitude diagram (CMD) of its resolved stars. The procedures to build synthetic CMDs and to exploit them to derive the SF histories (SFHs) are described, as well as the corresponding uncertainties.
Michele Cignoni, Monica Tosi, Ulrich Hopp   +2 more
wiley   +1 more source