Principal     Comenzar     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astrofotografía     La Colección     Foro     Blog New!     FAQ     Prensa     Login  

NGC 1108


Contenidos

Imágenes

Subir su imagen

DSS Images   Other Images


Artículos relacionados

The discovery of new galaxy members in the NGC 5044 and 1052 groups
We present the results of neutral hydrogen (HI) observations of the NGC5044 and NGC 1052 groups, as part of a GEMS (Group EvolutionMultiwavelength Study) investigation into the formation and evolution ofgalaxies in nearby groups. Two new group members have been discoveredduring a wide-field HI imaging survey conducted using the ATNF Parkestelescope. These results, as well as those from follow-up HI synthesisand optical imaging, are presented here. J1320 - 1427, a new member ofthe NGC 5044 group, has an HI mass of and , with a radial velocity of v=2750 kms-1. The optical galaxy is characterized by tworegions of star formation, surrounded by an extended, diffuse halo.J0249-0806, the new member of the NGC 1052 group, has and v= 1450kms-1. The optical image reveals a low-surface-brightnessgalaxy. We interpret both of these galaxies as irregular type, withJ0249 - 0806 possibly undergoing first infall into the NGC 1052 group.

The Southern Sky Redshift Survey
We report redshifts, magnitudes, and morphological classifications for5369 galaxies with m_B <= 15.5 and for 57 galaxies fainter than thislimit, in two regions covering a total of 1.70 sr in the southerncelestial hemisphere. The galaxy catalog is drawn primarily from thelist of nonstellar objects identified in the Hubble Space TelescopeGuide Star Catalog (GSC). The galaxies have positions accurate to ~1"and magnitudes with an rms scatter of ~0.3 mag. We compute magnitudes(m_SSRS2) from the relation between instrumental GSC magnitudes and thephotometry by Lauberts & Valentijn. From a comparison with CCDphotometry, we find that our system is homogeneous across the sky andcorresponds to magnitudes measured at the isophotal level ~26 magarcsec^-2. The precision of the radial velocities is ~40 km s^-1, andthe redshift survey is more than 99% complete to the m_SSRS2 = 15.5 maglimit. This sample is in the direction opposite that of the CfA2; incombination the two surveys provide an important database for studies ofthe properties of galaxies and their large-scale distribution in thenearby universe. Based on observations obtained at Cerro TololoInter-American Observatory, National Optical Astronomy Observatories,operated by the Association of Universities for Research in Astronomy,Inc., under cooperative agreement with the National Science Foundation;Complejo Astronomico El Leoncito, operated under agreement between theConsejo Nacional de Investigaciones Científicas de laRepública Argentina and the National Universities of La Plata,Córdoba, and San Juan; the European Southern Observatory, LaSilla, Chile, partially under the bilateral ESO-ObservatórioNacional agreement; Fred Lawrence Whipple Observatory;Laboratório Nacional de Astrofísica, Brazil; and the SouthAfrican Astronomical Observatory.

An image database. II. Catalogue between δ=-30deg and δ=70deg.
A preliminary list of 68.040 galaxies was built from extraction of35.841 digitized images of the Palomar Sky Survey (Paper I). For eachgalaxy, the basic parameters are obtained: coordinates, diameter, axisratio, total magnitude, position angle. On this preliminary list, weapply severe selection rules to get a catalog of 28.000 galaxies, wellidentified and well documented. For each parameter, a comparison is madewith standard measurements. The accuracy of the raw photometricparameters is quite good despite of the simplicity of the method.Without any local correction, the standard error on the total magnitudeis about 0.5 magnitude up to a total magnitude of B_T_=17. Significantsecondary effects are detected concerning the magnitudes: distance toplate center effect and air-mass effect.

Enviar un nuevo artículo


Enlaces relacionados

  • - No se han encontrado enlaces -
En viar un nuevo enlace


Miembro de los siguientes grupos:


Datos observacionales y astrométricos

Constelación:Erídano
Ascensión Recta:02h48m38.40s
Declinación:-07°57'04.0"
Dimensión Aparente:1.047′ × 0.741′

Catálogos y designaciones:
Nombres Propios   (Edit)
NGC 2000.0NGC 1108
HYPERLEDA-IPGC 10633

→ Solicitar más catálogos y designaciones a VizieR