B, V, Iphotometry of 20 dwarf irregular galaxies within 10 Mpc
نویسندگان
چکیده
منابع مشابه
B , V , I – photometry of 20 dwarf irregular galaxies within 10
CCD – photometry is presented for 20 dIrr galaxies situated in the nearby complexes CenA/M83, and CVnI as well as in the general field of the Local Volume. We present integrated magnitudes of the galaxies in B, V, Ibands and also surface brightness profiles to a median isophote μB ∼ 28 mag sq. arcsec . The popular Sersic parameterization of surface brightness profiles generally does a poor job ...
متن کاملDwarf Irregular Galaxies ? Liese
New observations of 16 dwarf elliptical galaxies in the Virgo Cluster indicate that at least seven dEs have significant velocity gradients along their optical major axis, with typical rotation amplitudes of 20-30 km s. Of the remaining nine galaxies in this sample, 6 have velocity gradients less than 20 km skpc while the other 3 observations had too low of a signal–to–noise ratio to determine a...
متن کاملGiant Halos in Dwarf Irregular Galaxies vs. Dwarf Elliptical Galaxies
We present a discovery of a giant stellar halo in NGC 6822, a dwarf irregular galaxy in the Local Group. This halo is mostly made of old red giants, showing striking features: 1) it is several times larger than the main body of the galaxy seen in the optical images, and 2) it is elongated in the direction almost perpendicular to the HI disk of NGC 6822. The structure of this stellar halo looks ...
متن کاملDwarf Irregular Galaxies and the Intergalactic Medium
Dwarf galaxies (DGs) are more numerous than large galaxies. Most dwarfs in clusters are dEs, but in the field they belong mostly to late types. The importance of late-type DGs in the context of the intergalactic medium (IGM) lies in the fact that (at least some) are probably " young " galaxies forming stars for the first time. Many DGs have significant amounts of interstellar gas, they may form...
متن کاملOrigin of dwarf irregular galaxies with outer early-type structures
Recent observations have reported that some gas-rich dwarf irregular (dIrr) galaxies appear to have spherical distributions in the outer underlying old and intermediate-age stellar populations (e.g., NGC 6822). These observations imply that some dIrr’s have two distinct (or “two-component”) structures, i.e., inner disky and outer spherical ones, though the number fraction of dIrr’s with such st...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2009
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2009.15088.x