Results 91 to 100 of about 11,151 (256)

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

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

A Search for Planetary Nebulae With the SDSS: the outer regions of M31

, 2013
We have developed a method to identify planetary nebula (PN) candidates in imaging data of the Sloan Digital Sky Survey (SDSS). This method exploits the SDSS' five-band sampling of emission lines in PN spectra, which results in a color signature distinct
Grebel, E. K., Kniazev, A. Y., Martinez-Delgado, D., Rix, H-W., Snedden, S. A., Zucker, D. B.   +5 more
core   +1 more source

Chemical Evolution of M31

, 2014
We review chemical evolution models developed for M31 as well as the abundance determinations available for this galaxy. Then we present a recent chemical evolution model for M31 including radial gas flows and galactic fountains along the disk, as well ...
Matteucci, F., Spitoni, E.
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

The Herschel Exploitation of Local Galaxy Andromeda (HELGA) II: Dust and Gas in Andromeda

, 2012
We present an analysis of the dust and gas in Andromeda, using Herschel images sampling the entire far-infrared peak. We fit a modified-blackbody model to ~4000 quasi-independent pixels with spatial resolution of ~140pc and find that a variable dust ...
Baes, M, Bendo, GJ, Blommaert, JADL, Boquien, M, Boselli, A, Braun, R, Clements, DL, Cooray, AR, Cortese, L, de Looze, I, Eales, SA, Ford, GP, Fritz, J, Gear, WK, Gentile, G, Gomez, HL, Gordon, KD, Kirk, J, Lebouteiller, V, Madden, S, Mentuch, E, O'Halloran, B, Page, MJ, Roman-Duval, J, Schulz, B, Smith, MWL, Spinoglio, L, Thilker, DA, Verstappen, J, Wilson, CD   +29 more
core   +4 more sources

Erratum: “First Resolved Dust Continuum Measurements of Individual Giant Molecular Clouds in the Andromeda Galaxy” (2020, ApJ, 890, 42) [PDF]

, 2020
Jan Forbrich, C. J. Lada, S. Viaene, G. Petitpas   +3 more
openalex   +1 more source

Project AMIGA: The Inner Circumgalactic Medium of Andromeda from Thick Disk to Halo

The Astrophysical Journal
The inner circumgalactic medium (CGM) of galaxies, where disk and halo processes intersect, remains poorly characterized despite its critical role in regulating galaxy evolution.
Nicolas Lehner, J. Christopher Howk, Lucy Collins, Sameer, Bart P. Wakker, Ramona Augustin, Kathleen A. Barger, Michelle A. Berg, Rongmon Bordoloi, Thomas M. Brown, Frances H. Cashman, Claude-André Faucher-Giguère, Andrew J. Fox, David M. French, Karoline M. Gilbert, Puragra Guhathakurta, John M. O’Meara, Brian W. O’Shea, Molly S. Peeples, D. J. Pisano, J. Xavier Prochaska, Jonathan Stern, Jason Tumlinson, Jessica K. Werk, Benjamin F. Williams   +24 more
doaj   +1 more source