Results 21 to 30 of about 102 (79)

Detection of a Spatially Extended Stellar Population in M33: A Shallow Stellar Halo?

The Astrophysical Journal
We analyze the outer regions of M33, beyond 15 kpc in projected distance from its center, using Subaru/Hyper Suprime-Cam multicolor imaging. We identify red giant branch (RGB) stars and red clump (RC) stars using the surface-gravity-sensitive NB515 ...
Itsuki Ogami, Yutaka Komiyama, Masashi Chiba, Mikito Tanaka, Puragra Guhathakurta, Evan N. Kirby, Rosemary F. G. Wyse, Carrie Filion, Takanobu Kirihara, Miho N. Ishigaki, Kohei Hayashi   +10 more
doaj   +1 more source

Metallicity Distribution in M31 and M33 Based on the Tip of the Red Giant Branch Near-infrared Color

The Astronomical Journal
This study investigates the metallicity distribution in M31 and M33 by using the near-infrared color index J − K of the tip of the red giant branch (TRGB) of the member stars from Y. Ren et al. after removing foreground dwarf stars by a near-infrared J −
Ying Li, Biwei Jiang, Yi Ren
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Shock Wave Precursors in M33 Supernova Remnants

The Astrophysical Journal
We present high-resolution profiles of the H α , [N II ], and [O III ] lines of supernova remnants (SNRs) in M33. The 8 km s ^−1 resolution allows us to separate emission from the photoionized shock precursors from the emission from shocked gas.
John C. Raymond, Nelson Caldwell, Knox S. Long   +2 more
doaj   +1 more source

Subaru Suprime-Cam Wide-field BVI Stellar Photometry of the M33 Galaxy

The Astrophysical Journal Supplement Series
We have surveyed the complete extent of the disk of M33—a gas-rich low-mass dwarf spiral galaxy in the Local Group. The B- , V- , and I -passband (the Johnson–Cousins system) CCD images (typical seeing ∼0.″8) were obtained with the Subaru Telescope ...
Rima Stonkutė, Vladas Vansevičius
doaj   +1 more source

Testing Warm Dark Matter with Kinematics of the Smallest Galaxies

The Astrophysical Journal
Every dark matter halo forms with a ρ  ∝  r ^−1.5 density cusp at its center. For warm dark matter (WDM), these prompt cusps can be massive enough to influence the kinematics of dwarf galaxies.
M. Sten Delos, Niusha Ahvazi, Andrew Benson   +2 more
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The Karl G. Jansky Very Large Array Local Group L-Band Survey (LGLBS)

The Astrophysical Journal Supplement Series
We present the Local Group L -Band Survey, a Karl G. Jansky Very Large Array (VLA) survey producing the highest-quality 21 cm and 1–2 GHz radio continuum images to date, for the six VLA-accessible, star-forming, Local Group galaxies. Leveraging the VLA’s
Eric W. Koch, Adam K. Leroy, Erik W. Rosolowsky, Laura Chomiuk, Julianne J. Dalcanton, Nickolas M. Pingel, Sumit K. Sarbadhicary, Snežana Stanimirović, Fabian Walter, Haylee N. Archer, Alberto D. Bolatto, Michael P. Busch, Hongxing Chen, Ryan Chown, Harrisen Corbould, Serena A. Cronin, Jeremy Darling, Thomas Do, Jennifer Donovan Meyer, Cosima Eibensteiner, Deidre Hunter, Rémy Indebetouw, Preshanth Jagannathan, Amanda A. Kepley, Chang-Goo Kim, Shin-Jeong Kim, Timea O. Kovacs, Joshua Marvil, Eric J. Murphy, Claire E. Murray, Jürgen Ott, D.J. Pisano, Mary Putman, Daniel R. Rybarczyk, Julia Roman-Duval, Karin Sandstrom, Eva Schinnerer, Evan D. Skillman, Adam Smercina, Ioana Stelea, Jay Strader, Jiayi Sun, Devisree Tallapaneni, Elizabeth Tarantino, Vicente Villanueva, Daniel R. Weisz, Thomas G. Williams, Tony Wong   +47 more
doaj   +1 more source

The M33 Cluster System: Fossil Records of a Galaxy's Evolution

Iraqi Journal of Physics
This study uses star clusters of the Triangulum galaxy (M33) as fossil records to trace its evolutionary history. We synthesize previous observational studies of the cluster system’s population, kinematics, and chemical properties to construct a unified
Ahmed H. Abdullah, Rasha H. Ibrahim, Israa A. Mohammed Ali   +2 more
doaj   +1 more source

Spatial Age Distribution of Classical Cepheids in Spiral Galaxies: The Cases of M31 and M33

The Astrophysical Journal Letters
Classical Cepheids can be used as age indicators due to well-established period–age and period–age–color relations. G. De Somma et al. refined these relations by including a metallicity term and different mass–luminosity assumptions.
Giulia De Somma, Marcella Marconi, Vincenzo Ripepi, Santi Cassisi, Roberto Molinaro, Ilaria Musella, Teresa Sicignano, Erasmo Trentin   +7 more
doaj   +1 more source

The Low-mass Stellar Initial Mass Function in Nearby Ultrafaint Dwarf Galaxies

The Astrophysical Journal
The stellar initial mass function (IMF) describes the distribution of stellar masses that form in a given star formation event. The long main-sequence lifetimes of low-mass stars mean that the IMF in this regime (below ∼ 1 M _⊙ ) can be investigated ...
Carrie Filion, Rosemary F. G. Wyse, Hannah Richstein, Nitya Kallivayalil, Roeland P. van der Marel, Elena Sacchi   +5 more
doaj   +1 more source

Large Variations Seen in First Ultraviolet Spectroscopic M33 Dust Extinction Curves

The Astrophysical Journal
Dust extinction curves provide one of the main avenues to understanding the detailed nature of dust grains and accounting for the effects of dust on observations of many astrophysical objects. For the first time, spectroscopic ultraviolet (UV) extinction
Karl D. Gordon, Petia Yanchulova Merica-Jones, Geoffrey C. Clayton, Ralph Bohlin, Marjorie Decleir, Claire E. Murray, Luciana Bianchi   +6 more
doaj   +1 more source