Newly Discovered Wolf–Rayet Stars in M31 [PDF]
The Astronomical Journal, 2023 The evolved massive star populations of the Local Group galaxies are generally thought to be well understood. However, recent work has suggested that the Wolf–Rayet (WR) content of M31 may have been underestimated.
Kathryn F. Neugent, Philip Massey
doaj +4 more sources
The rotation curve and mass distribution of M31 [PDF]
Monthly Notices of the Royal Astronomical SocietyTo gain a better understanding of the Andromeda galaxy M31 and its role in the Local Group, measuring its mass precisely is essential. In this work, we have constructed the rotation curve of M31 out to ∼125 kpc using 13,679 M31 objects obtained from ...
Zhijia Tian, Bingqiu Chen, Jiarui Sun
exaly +3 more sources
The Hubble Space Telescope Survey of M31 Satellite Galaxies. IV. Survey Overview and Lifetime Star Formation Histories [PDF]
The Astrophysical JournalFrom >1000 orbits of HST imaging, we present deep homogeneous resolved star color–magnitude diagrams that reach the oldest main-sequence turnoff and uniformly measured star formation histories (SFHs) of 36 dwarf galaxies (−6 ≥ M _V ≥ −17) associated with
Alessandro Savino +37 more
doaj +2 more sources
Unveiling α-MoO<sub>3</sub> as a High-Index, Low-Loss Anisotropic Material: Bridging the Gap From Mid-Infrared to Ultraviolet Nanophotonics. [PDF]
Adv Materα‐MoO3 is established as a high‐index, low‐loss anisotropic platform bridging mid‐infrared polaritonics and ultraviolet‐visible nanophotonics. Spectroscopic ellipsometry and calculations reveal refractive indices exceeding 3.9, with the largest in‐plane birefringence among transparent layered crystals at 425–500 nm, enabling zero‐order UV waveplates ...
Toksumakov AN +14 more
europepmc +2 more sources
Establishing the Epidemiological Cut-Off Value (ECOFF) for Cefquinome Against Staphylococcus aureus Using Standardised MIC Data. [PDF]
Vet Med SciA total of 110 Staphylococcus aureus isolates from cattle were analysed to determine the epidemiological cut‐off value (ECOFF) for cefquinome. Minimum inhibitory concentrations (MICs) were determined using standardised agar dilution and broth microdilution methods following 24 h incubation.
Ahmad I +8 more
europepmc +2 more sources
The Hubble Space Telescope Survey of M31 Satellite Galaxies. II. The Star Formation Histories of Ultrafaint Dwarf Galaxies [PDF]
Astrophysical Journal, 2023 We present the lifetime star formation histories (SFHs) for six ultrafaint dwarf (UFD; M V > − 7.0, 4 ...
A. Savino +36 more
semanticscholar +1 more source
Pegasus W: An Ultrafaint Dwarf Galaxy Outside the Halo of M31 Not Quenched by Reionization [PDF]
Astrophysical Journal, 2023 We report the discovery of an ultrafaint dwarf (UFD) galaxy, Pegasus W, located on the far side of the Milky Way–M31 system and outside the virial radius of M31.
K. McQuinn +5 more
semanticscholar +1 more source
On the α/Fe Bimodality of the M31 Disks [PDF]
Astrophysical Journal Letters, 2023 An outstanding question is whether the α/Fe bimodality exists in disk galaxies other than in the Milky Way. Here we present a bimodality using our state-of-the-art galactic chemical evolution models that can explain various observations in the Andromeda ...
C. Kobayashi +3 more
semanticscholar +1 more source
The Hubble Space Telescope Survey of M31 Satellite Galaxies. I. RR Lyrae–based Distances and Refined 3D Geometric Structure [PDF]
Astrophysical Journal, 2022 We measure homogeneous distances to M31 and 38 associated stellar systems (−16.8 ≤ M V ≤ −6.0), using time-series observations of RR Lyrae stars taken as part of the Hubble Space Telescope Treasury Survey of M31 Satellites.
A. Savino +35 more
semanticscholar +1 more source
Satellites of Milky Way- and M31-like galaxies with TNG50: Quenched fractions, gas content, and star formation histories [PDF]
Monthly notices of the Royal Astronomical Society, 2022 We analyse the quenched fractions, gas content, and star formation histories of ∼1200 satellite galaxies with M* ≥ 5 × 106 M⊙ around 198 Milky Way- (MW) and Andromeda-like (M31) hosts in TNG50, the highest-resolution simulation of IllustrisTNG ...
C. Engler +5 more
semanticscholar +1 more source