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H. Arp

Publications and source records attributed to H. Arp.

20 records · Page 2Linked to original sources

Arguments for a Hubble Constant near $H_0$ = 55

Recent analyses of Cepheid distances to spiral galaxies have led to an announcement of a Hubble constant of $H_0 = 72 \pm 8$ km/sec/Mpc. The new Cepheid distances, however, show that there are numerous redshift distances with large excesses which cannot be due to peculiar velocities. Ignoring these discordant redshifts, if the Hubble constant is calibrated with Cepheid distances of low redshift spirals a value near $H_0$ = 55 is obtained. Use of independent distance criteria such as Tully-Fisher and group membership verifies this value and leads to three conclusions: 1) The peculiar velocities of galaxies in space are characteristically small. 2) Sc companions to normal Sb's tend to be less luminous, with younger stellar populations and small amounts non velocity redshift. 3) ScI and other purportedly over luminous spirals have large amounts of intrinsic redshift.

astro-ph↗

Quasars around the Seyfert Galaxy NGC3516

We report redshift measurements of 5 X-ray emitting blue stellar objects (BSO's) located less than 12 arc min from the X-ray Seyfert galaxy, NGC 3516. We find these quasars to be distributed along the minor axis of the galaxy and to show a very good correlation between their redshift and their angular distance from NGC 3516. Moreover the redshifts of these 5 quasars are: 0.33, 0.69, 0.93, 1.40 and 2.10 which are very near the peaks of the redshift periodicity distribution (i.e. z=0.3, 0.6, 0.96, 1.41 and 1.96). All these observed properties strikingly confirm, around this single example of a Seyfert, the composite picture derived from previous physical associations of quasars with low redshift, active galaxies.

astro-ph↗