Results 21 to 30 of about 47,309 (203)
Spectroscopic Observations of Planetary Nebulae in the Northern Spur of M31 [PDF]
, 2013 We present spectroscopy of three planetary nebulae (PNe) in the Northern Spur of the Andromeda Galaxy (M31) obtained with the Double Spectrograph on the 5.1 m Hale Telescope at the Palomar Observatory.
Fang, X. +4 more
core +2 more sources
The Astrophysical Journal, 1984 Maps of M31 have been obtained at wavelengths of 12, 25, 60, and 100 microns. Emission is detected from the center and from a ring of 50 arcmin radius. The ring is that also seen in H I, in H II, and in radio continuum radiation. The spectrum of the central emission suggests a hotter dust temperature than in the ring. M31 is a weak infrared source, the
Habing, H.J. +10 more
openaire +3 more sources
Discovery of 20 UV-emitting SNRs in M31 with UVIT
The Astronomical Journal, 2023 We present the first catalog of supernova remnants (SNRs) in M31 that exhibit diffuse ultraviolet (UV) emission. UV images of M31 were obtained by the Ultraviolet Imaging Telescope (UVIT) on the AstroSat satellite, and the list of SNRs was obtained from ...
Denis Leahy +2 more
doaj +1 more source
The Astrophysical Journal, 2023 We present spectroscopic chemical abundances of red giant branch stars in Andromeda (M31), using medium-resolution ( R ∼ 6000) spectra obtained via the Spectroscopic and Photometric Landscape of Andromeda’s Stellar Halo survey.
J. Leigh Wojno +8 more
doaj +1 more source
Symposium - International Astronomical Union, 1974 The luminosity of the brightest Hiiregions of M31 was determined with the NRAO 3-element interferometer at 3.7 cm and 11 cm wavelength. It is unlikely that M31 has any superbright Hiiregions such as W51 or W49; our Galaxy has between 10 and 20 Hiiregions that are more luminous than any in M31.
J. H. Spencer, B. F. Burke
openaire +1 more source
X-ray and Radio Variability of M31*, The Andromeda Galaxy Nuclear Supermassive Black Hole [PDF]
, 2009 We confirm our earlier tentative detection of M31* in X-rays and measure its light-curve and spectrum. Observations in 2004-2005 find M31* rather quiescent in the X-ray and radio.
Baganoff +50 more
core +2 more sources
Planetary nebulae in M32 and the bulge of M31: Line intensities and oxygen abundances [PDF]
, 1998 We present spectroscopy of planetary nebulae in M32 and in the bulge of M31 that we obtained with the MOS spectrograph at the Canada-France-Hawaii Telescope. Our sample includes 30 planetary nebulae in M31 and 9 planetary nebulae in M32. We also observed
McCall, Marshall L. +2 more
core +2 more sources
Could M31 be the result of a major merger?
EPJ Web of Conferences, 2012 We investigated a scenario in which M31 could be the remnant of a gas-rich major merger. Galaxy merger simulations, highly constrained by observations, were run using GADGET 2 in order to reproduce M31. We succeeded in reproducing the global shape of M31,
Puech M. +5 more
doaj +1 more source
Dynamical Mass Estimates for the Halo of M31 from Keck Spectroscopy [PDF]
, 2000 The last few months have seen the measurements of the radial velocities of all of the dwarf spheroidal companions to the Andromeda galaxy (M31) using the spectrographs (HIRES and LRIS) on the Keck Telescope.
Eva K. Grebel +7 more
core +2 more sources
On the Gamma-Ray Emission of the Andromeda Galaxy M31
The Astrophysical Journal Letters, 2023 Using the γ -ray data obtained with the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (Fermi) for ∼14 yr, we examine the high-energy emission emanating from the center of the Andromeda galaxy M31.
Yi Xing +3 more
doaj +1 more source