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|Galaxy coordinates. II. Accurate equatorial coordinates for 17298 galaxies|
Using images of the Digitized Sky Survey we measured coodinates for17298 galaxies having poorly defined coordinates. As a control, wemeasured with the same method 1522 galaxies having accurate coordinates.The comparison with our own measurements shows that the accuracy of themethod is about 6 arcsec on each axis (RA and DEC).
|A Gravitational Lens Solution for the IRAS Galaxy FSC 10214+4724|
We show that the z = 2.3 IRAS source FSC 10214+4724 is gravitationallylensed by an intervening elliptical galaxy. Its many anomalousproperties can be explained if the active galactic nucleus (AGN) regionof the source is much more magnified than its outer regions. We uncovera small counterimage to the arc adjacent to the lensing galaxy, aspredicted by our lens model. A redshift of unity for the lens issuggested by a red component in the observed spectrum, yielding alensing mass interior to the critical radius of M(r < 3 kpc) ~ 1011Mȯ, consistent with an ordinary massive galaxy. We present newhigh-resolution optical images which show a thin arc of emission,implying that the optical source is compact (less than 0.5 kpc) andhighly magnified (more than 20 times). Since the optical emission isknown to be strongly polarized and Seyfert 2, we propose that theoptical arc is a highly magnified image of the inner "mirror" region ofan obscured AGN. The central obscuring "torus" will be similarlymagnified, naturally accounting for the large IR flux. We propose thatcases like F10214 represent the obscured AGN counterparts to the lensedQSO population, and find that the probability of finding objects likeF10214 in IRAS redshift surveys is reasonably large.
|A redshift survey toward a proposed void of galaxies suggested by the distribution of Abell clusters|
A program of redshift measurements was carried out in a region of thesky in which a relative under-density of Abell clusters had been used toinfer the presence of a large (diameter about 40/h Mpc) void in thegeneral galaxy distribution. The purpose of this study was toinvestigate whether the large-scale distribution of galaxies is tracedby the distribution of rich clusters. Redshifts are presented for 308galaxies in the Zwicky Catalog in a 234 square degree region centered onR.A. about 2h, Decl. about 12 deg of which 229 have been newly measured.These data reveal a pattern of filamentary structure alternating withvoids of characteristic diameter about 25-30/h Mpc, throughout thevolume sampled. While the redshift data reveal an underdensity in thedistribution of galaxies in the general region suggested by the Abellcluster distribution, they do not support the existence there of a 40/hMpc diameter void.
|Isolated Triplets of Galaxies - a Complete Summary of Radial Velocities and Reduced Data|
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