نتایج جستجو برای: galaxies individual andromeda i
تعداد نتایج: 1476211 فیلتر نتایج به سال:
We present V and I photometry of the resolved stars in the most metal-deficient blue compact dwarf galaxy known, I Zw 18 (Z⊙/50), using Hubble Space Telescope/Advanced Camera for Surveys (ACS) images, the deepest ones ever obtained for this galaxy. The resulting I vs. V − I color-magnitude diagram (CMD) reaches limiting magnitudes V = I = 29 mag. It reveals a young stellar population of blue ma...
Gaia DR3 contains 1.8 billion sources with G-band photometry, 1.5 of which BP and RP complemented by positions on the sky, parallax, proper motion. The median number field-of-view transits in three photometric bands is between 40 44 measurements per source covers 34 months data collection. We pursue a classification Galactic extra-galactic objects that are detected as variable across whole sky....
Luminosity functions of globular clusters in five nearby spiral galaxies using <i>HST</i>/ACS images
We here present the luminosity function (LF) of globular clusters (GCs) in five nearby spiral galaxies using samples GC candidates selected Hubble Space Telescope mosaic images F435W, F555W and F814W filters. Our search, which surpasses fractional area covered by all previous searches these galaxies, has resulted detection 158 M81, 1123 M101, 226 NGC4258, 293 M51 173 NGC628. The LFs constructed...
Quantitative dynamical models of galaxies require deprojecting the observed surface brightness to determine the luminosity density of the galaxy. Existing deprojection methods for axisymmetric galaxies assume that a unique deprojection exists for any given inclination, even though the projected density is known to be degenerate to the addition of “konus densities” that are invisible in projecti...
We simulate the future evolution of the observed inhomogeneities in the local universe assuming that the global expansion rate is dominated by a cosmological constant. We find that within two Hubble times (∼ 30 billion years) from the present epoch, large-scale structures will freeze in comoving coordinates and the mass distribution of bound objects will stop evolving. The Local Group will get ...
We present GALEX FUV (1530 Å) and NUV (2310 Å) observations of the archetypal merging system NGC 4038/39, “The Antennae”. Both tails are relatively bright in the UV , especially in the vicinity of the Tidal Dwarf Galaxy candidates at the end of the southern tail. The UV light generally falls within the optically delineated tails, although the UV light is considerably more structured, with a rem...
This letter reports on the Galactic stellar structures that appear in the foreground of our CanadaFrance-Hawaii-Telecopse/MegaCam survey of the halo of the Andromeda galaxy. We recover the main sequence and main sequence turn-off of the Triangulum-Andromeda structure recently found by Majewski and collaborators at a heliocentric distance of ∼ 20 kpc. The survey also reveals another less populat...
We report spectroscopic detection of three z ∼ 6 Lyman-α emitting galaxies, in the vicinity of the Hubble Ultra Deep Field, from the early data of the Gemini Lyman-α at Reionisation Era (GLARE) project. Two objects, GLARE#3001 (z = 5.79) and GLARE#3011 (z = 5.94), are new detections and are fainter in z (z AB = 26.37 and 27.15) than any Lyman break galaxy previously detected in Lymanα. A third ...
We present longslit optical spectroscopy of three high surface brightness Magellanic irregular galaxies. This paper draws attention to our detection of He I λ5876 line emission from the ionized gas outside the HII regions, or the warm ionized phase of the interstellar medium. We measure a mean reddening-corrected intensity ratio of He I λ5876 / Hα ≈ 0.041 independent of spatial location. This r...
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