Results 81 to 90 of about 1,957 (169)

High-frequency Fast Radio Burst Search of Nearby Star-forming Galaxies M77 and M82

The Astrophysical Journal
The astrophysical origins of fast radio bursts (FRBs) are still unknown, but magnetars are a strong candidate for producing at least some FRBs. To investigate the magnetar progenitor model, we conducted a deep search of M77 and M82, two nearby galaxies ...
Robert S. Wharton, Walid A. Majid, Myles B. Sherman, Liam Connor, Jonathon Kocz, Wenbin Lu, Aaron B. Pearlman, Thomas A. Prince, Vikram Ravi   +8 more
doaj   +1 more source

EMPRESS. XV. A New Determination of the Primordial Helium Abundance Suggesting a Moderately Low YP Value

The Astrophysical Journal
We present a new constraint on the primordial helium abundance, Y _P , based on Subaru observations. A major source of uncertainty in previous Y _P determinations is the lack of extremely metal-poor galaxies (EMPGs; 0.01–0.1 Z _⊙ ), which have ...
Hiroto Yanagisawa, Masami Ouchi, Akinori Matsumoto, Masahiro Kawasaki, Kai Murai, Kimihiko Nakajima, Kazunori Kohri, Yuma Sugahara, Kentaro Nagamine, Ichi Tanaka, Ji Hoon Kim, Yoshiaki Ono, Minami Nakane, Keita Fukushima, Yuichi Harikane, Yutaka Hirai, Yuki Isobe, Haruka Kusakabe, Masato Onodera, Michael Rauch, Hidenobu Yajima   +20 more
doaj   +1 more source

Stellar Metallicities and Gradients in the Faint M31 Satellites Andromeda XVI and Andromeda XXVIII

The Astrophysical Journal
We present ∼300 stellar metallicity measurements in two faint M31 dwarf galaxies, Andromeda XVI ( M _V = −7.5) and Andromeda XXVIII ( M _V = –8.8), derived using metallicity-sensitive calcium H and K narrowband Hubble Space Telescope imaging.
Sal Wanying Fu, Daniel R. Weisz, Else Starkenburg, Nicolas Martin, Michelle L. M. Collins, Alessandro Savino, Michael Boylan-Kolchin, Patrick Côté, Andrew E. Dolphin, Nicolas Longeard, Mario L. Mateo, Francisco J. Mercado, Nathan R. Sandford, Evan D. Skillman   +13 more
doaj   +1 more source

E. B. DOLINSKAYA’S SCIENTIFIC GALAXY

Arts Education and Science
This article is a tribute to Elena Borisovna Dolinskaya, a Teacher, Master, Musician, Scholar and Outstanding Cultural Figure, on the occasion of her jubilee. A researcher’s portrait is created through his or her personality and work. The portrait of a scholar and teacher is created by students.
openaire   +1 more source

Origins and lifetimes of secular and tidal bars in simulated disc galaxies. [PDF]

Mon Not R Astron Soc
Frosst M, Obreschkow D, Ludlow A, Fraser-McKelvie A.   +3 more
europepmc   +1 more source

Orbiting, colliding, and merging liquid lenses on a soap film: Toward gravitational analogs. [PDF]

PNAS Nexus
Martischang JP, Reichert B, Haouche I, Rousseaux G, Duchesne A, Baudoin M.   +5 more
europepmc   +1 more source

A Discrete Informational Framework for Classical Gravity: Ledger Foundations and Galaxy Rotation Curve Constraints. [PDF]

Entropy (Basel)
Simons M, Allahyarov E, Washburn J.
europepmc   +1 more source

Formation time-scales for stellar bars in diverse galactic discs. [PDF]

Mon Not R Astron Soc
Frosst M, Obreschkow D, Ludlow A.
europepmc   +1 more source

Unsupervised multimodal deep learning for galaxy morphology taxonomy: integrating ConvNeXtEmbeddings and morphological parameters for scalable survey science. [PDF]

Sci Rep
Selim IM, Farahat AS, Basmsm LH, El-Hameed AMA.   +3 more
europepmc   +1 more source

Galaxy Evolution with Manifold Learning. [PDF]

Entropy (Basel)
Takeuchi TT, Cooray S, Kano RR.
europepmc   +1 more source