Contingut
Imatges
Carregar la teva Imatge
DSS Images Other Images
Articles Relacionats
The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| 3C 65: old galaxy or buried quasar?
3C 65 is one of the reddest known radio galaxies at z~=1. We have takenoptical and near-infrared spectra, and a K-band image in an attempt toassess whether this red colour is produced by an underlying old stellarpopulation. We find that the broad- and intermediate-band fluxes areconsistent with a power-law spectrum in the optical/near-infrared, withno evidence for a 4000-A break, showing that the K-band light isdominated by a reddened quasar nucleus. By comparing the opticalspectral index with the mean for optically selected quasars, we estimatean A_V~=2 towards the nucleus and an unreddened quasar magnitude ofV~=19. Our spectra, however, do indicate the presence of a 4000-A breakin the off-nuclear light, consistent with either a formation redshiftz_f>4 for a stellar population with a standard IMF, or the presenceof young supergiant stars, which we have previously argued are presentin the off-nuclear knot of 3C 356.
|
Enviar un nou article
Enllaços Relacionats
- - No s'ha trobat enllaços -
Enviar un nou enllaç
Membre dels grups següents:
|
Dades d'Observació i Astrometria
| Constel·lació: | Andromeda |
| Ascensió Recta: | 02h19m36.91s |
| Declinació: | +39°28'31.7" |
| Magnitud Aparent: | 8.235 |
| Distancia: | 261.097 parsecs |
| Moviment propi RA: | -25.5 |
| Moviment propi Dec: | -14.3 |
| B-T magnitude: | 9.534 |
| V-T magnitude: | 8.343 |
Catàlegs i designacions:
|
INHABITED SKY
