Results 61 to 70 of about 406 (178)

Reflecting on Our Present Self‐Awareness of Not Having Found Any Life Beyond Earth

Earth and Space Science, Volume 11, Issue 1, January 2024.
Abstract Ever gazed at the stars and wondered if we’re alone? Scientists have been on a quest to find life beyond Earth, but no aliens yet. It’s tough because space is huge, and potential life is incredibly far away, making it difficult to detect their signals. Despite this, our ability to search is improving.
Stuart F. Taylor, Jonathan H. Jiang, Nick Searra, Philip E. Rosen   +3 more
wiley   +1 more source

Dust around Massive Stars Is Agnostic to Galactic Environment: New Insights from PHAT/BEAST

The Astrophysical Journal
Resolving the environments of massive stars is crucial for understanding their formation mechanisms and their impact on galaxy evolution. An important open question is whether massive stars found in diffuse regions outside spiral arms formed in situ or ...
Christina Willecke Lindberg, Claire E. Murray, Julianne J. Dalcanton, J. E. G. Peek, Karl D. Gordon   +4 more
doaj   +1 more source

VERITAS Observations of M31 (the Andromeda Galaxy) [PDF]

Proceedings of The 34th International Cosmic Ray Conference — PoS(ICRC2015), 2016
Diffuse gamma rays are tracers of cosmic rays, providing information on their origin, interaction and diffusion through a galaxy. M 31 (the Andromeda Galaxy) is the closest spiral galaxy to the Milky Way (d = 780 kpc) and is very well studied at all wavelengths. Thus it is a prime target for the study of diffuse gamma-ray emission. The very-high-energy
openaire   +2 more sources

THE LUMINOSITY PROFILE AND STRUCTURAL PARAMETERS OF THE ANDROMEDA GALAXY [PDF]

The Astrophysical Journal, 2011
We have constructed an extended composite luminosity profile for the Andromeda galaxy, M31, and have decomposed it into three basic luminous structural components: a bulge, a disk and a halo. The dust-free Spitzer/IRAC imaging and extended spatial coverage of ground-based optical imaging and deep star counts allow us to map M31's structure from its ...
Courteau, Stephane, Widrow, Lawrence M., McDonald, Michael A., Guhathakurta, Puragra, Gilbert, Karoline M., Zhu, Yucong, Beaton, Rachael Lynn, Majewski, Steven R.   +7 more
openaire   +4 more sources

Disk‐Bulge‐Halo Models for the Andromeda Galaxy [PDF]

The Astrophysical Journal, 2003
We present a suite of semi-analytic disk-bulge-halo models for the Andromeda galaxy (M31) which satisfy three fundamental conditions: (1) internal self-consistency; (2) consistency with observational data; and (3) stability of the disk against the formation of a central bar. The models are chosen from a set first constructed by Kuijken and Dubinski. We
Widrow, Lawrence M., Perrett, Kathryn M., Suyu, Sherry H.   +2 more
openaire   +2 more sources

The Role of Pressure in the Structure and Stability of GMCs in the Andromeda Galaxy

The Astrophysical Journal
We revisit the role of pressure in the structure, stability, and confinement of Giant Molecular Clouds (GMCs) in light of recently published observations and analysis of the GMCs in the Andromeda galaxy (M31). That analysis showed that, in the absence of
Charles J. Lada, Jan Forbrich, Mark R. Krumholz, Eric Keto   +3 more
doaj   +1 more source

Local Analogs of Primordial Galaxies: In Search of Intermediate-mass Black Holes with JWST NIRSpec

The Astrophysical Journal
Local low-metallicity galaxies with signatures of possible accretion activity are ideal laboratories in which to search for the lowest-mass black holes and study their impact on the host galaxy.
Sara Doan, Shobita Satyapal, William Matzko, Nicholas P. Abel, Torsten Böker, Thomas Bohn, Gabriela Canalizo, Jenna M. Cann, Jacqueline Fischer, Stephanie LaMassa, Suzanne C. Madden, Jeffrey D. McKaig, D. Schaerer, Nathan J. Secrest, Anil Seth, Laura Blecha, Mallory Molina, Barry Rothberg   +17 more
doaj   +1 more source

Ring or No Ring—Revisiting the Multiphase Nuclear Environment in M31

The Astrophysical Journal
Nuclear rings, prevalent in barred galaxies, are essential to understanding gas transport toward galactic nuclei. However, the peculiar nuclear ring in our neighboring galaxy M31 remains poorly understood.
Zongnan Li, Zhao Su, Sumin Wang, Yufan F. Zhou, Zhiyuan Li, Xuanyi Lyu, Fanyi Meng, Kai Zhang, Di Li, Chaowei Tsai, Jingwen Wu, Jiachang Zhang   +11 more
doaj   +1 more source

Andromeda XXXVI: Discovery of a new ultra-faint dwarf galaxy towards M31

Astronomy & Astrophysics
Aims. We present deep imaging of Andromeda XXXVI (And XXXVI), a dwarf galaxy discovered through visual inspection of the Pan-Andromeda Archaeological Survey using observations obtained with the OSIRIS+@GTC instrument. Methods.
Sakowska Joanna D., Martínez-Delgado David, Collins Michelle L. M., Monelli Matteo, Donatiello Giuseppe, Doliva-Dolinsky Amandine, Santos-Santos Isabel M. E.   +6 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
doaj   +1 more source