Results 81 to 90 of about 10,594 (212)

New luminous blue variables in the Andromeda galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
We performed spectroscopy of five Luminous Blue Variable (LBV) candidates and two known LBV stars (AE And and Var A-1) in M31. We obtained the same-epoch near-infrared (NIR) and optical spectra of these stars. The NIR spectra were taken with Triplespec spectrograph at the 3.5-m telescope at Apache Point Observatory, and the optical spectroscopy was ...
Sholukhova O., Bizyaev D., Fabrika S., Sarkisyan A., Malanushenko V., Valeev A.   +5 more
openaire   +4 more sources

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

An LBT view of the Andromeda’s satellite galaxies [PDF]

EPJ Web of Conferences, 2017
Results are presented on deep (V ∼ 26.5 mag) time series observations of four dwarf spheroidal galaxies (dSphs) in the Andromeda (M31) complex, namely, And XIX, And XXI, And XXV and And XXVII, that we have observed with the Large Binocular Telescope (LBT). We discovered in these galaxies a total of over 200 RR Lyrae stars and 19 Anomalous Cepheids.
Cusano, Felice, Garofalo, Alessia, Clementini, Gisella, Cignoni, Michele   +3 more
openaire   +4 more sources

Tidal stripping as a mechanism for placing globular clusters on wide orbits: the case of MGC1 in M31

, 2019
The globular clusters of large spiral galaxies can be divided into two populations: one which formed in-situ and one which comprises clusters tidally stripped away from other galaxies.
Andersson, Eric P., Davies, Melvyn B.
core   +1 more source

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

A New Giant Stellar Structure in the Outer Halo of M31

, 2004
The Sloan Digital Sky Survey has revealed an overdensity of luminous red giant stars ~ 3 degrees (40 projected kpc) to the northeast of M31, which we have called Andromeda NE.
Bell, Eric F., Brewington, Howard, Brinkmann, J., Grebel, Eva K., Harvanek, Michael, Holtzman, Jon A., Ivezic, Zeljko, Kleinman, S. J., Kniazev, Alexei Y., Krzesinski, Jurek, Lamb, Don Q., Long, Dan, Martinez-Delgado, David, Newman, Peter R., Nitta, Atsuko, Rix, Hans-Walter, Rockosi, Constance M., Snedden, Stephanie A., Walterbos, Rene A. M., Zucker, Daniel B.   +19 more
core   +2 more sources

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

Investigating the Andromeda Stream: II. Orbital Fits and Properties of the Progenitor

, 2005
We construct test-particle orbits and simple N-body models that match the properties of the giant stellar stream observed to the south of M31, using the model of M31's potential derived in the companion paper by Geehan et al. (2006).
A. Babul, Binney, Choi, De Rijcke, De Vaucouleurs, Durrell, Durrell, Ferguson, Ferguson, Font, Geehan, Guhathakurta, Ibata, Ibata, Ibata, J. J. Geehan, Johnston, Johnston, Johnston, Landau, Law, M. A. Fardal, Martínez-Delgado, Mateo, McConnachie, McConnachie, Merrett, Merrett, Morrison, P. Guhathakurta, Peebles, Stadel, Stanek, Taylor, Totten, Wadsley, Zucker   +36 more
core   +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