1,257 research outputs found
A Galaxy Cluster Near NGC 720
The galaxy cluster RXJ 0152.7-1357 is emitting X-rays at the high rate of 148
counts . It would be one of the most luminous X-ray clusters known if
it is at its redshift distance of z = .8325. It is conspicuously elongated,
however, toward the bright, X-ray active galaxy NGC 720 about 14 arcmin away.
At the same distance on the other side of NGC 720, and almost perfectly
aligned, is an X-ray BSO of 5.8 cts/ks. It is reported here that the redshift
of this quasar is z = .8312.Comment: 7 pages, 4 figure
Arguments for a Hubble Constant near = 55
Recent analyses of Cepheid distances to spiral galaxies have led to an
announcement of a Hubble constant of 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 = 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.Comment: condensed version submitted to ApJLetter
X-ray Bright QSO's around NGC 3079
NGC 3079 is a very active, disturbed galaxy which has been observed to have
X-ray and radio ejections from it as well as an optical superbubble along its
minor axis. Here we show that the brightest X-ray sources within about 40
arcmin are in large excess of background values. The X-ray sources are
identified as quasars and AGN's which are aligned and spaced across the Seyfert
nucleus to a degree which is unlikely to be due to chance. The famous double
quasar which has been interpreted as a gravitational lens is discussed in terms
of the the X - ray and ULX sources which appear associated with NGC 3079.Comment: 6 figures, submitted to Ap
Periodicities of Quasar Redshifts in Large Area Surveys
We test the periodicity of quasar redshifts in the 2dF and SDSS surveys. In
the overall surveys redshift peaks are already apparent in the brighter
quasars. But by analyzing sample areas in detail it is shown that the redshifts
fit very closely the long standing Karlssson formula and strongly suggest the
existence of preferred values in the distribution of quasar redshifts.
We introduce a powerful new test for groups of quasars of differing redshifts
which not only demonstrates the periodicity of the redshifts, but also their
physical association with a parent galaxy. Further such analyses of the large
area surveys should produce more information on the properties of the
periodicity.Comment: 23 pages, 14 figure
NGC 3628: Ejection Activity Associated with Quasars
NGC3628 is a well-studied starburst/low level AGN galaxy in the Leo Triplet
noted for its extensive outgassed plumes of neutral hydrogen. QSOs are shown to
be concentrated around NGC3628 and aligned with the HI plumes. The closest high
redshift quasar has z=2.15 and is at the tip of an X-ray filament emerging
along the minor axis HI plume. Location at this point has an accidental
probability of ~2x10^-4. In addition a coincident chain of optical objects
coming out along the minor axis ends on this quasar. More recent measures on a
pair of strong X-ray sources situated at 3.2 and 5.4 arcmin on either side of
NGC3628 along its minor axis, reveal that they have nearly identical redshifts
of z=0.995 and 0.981. The closer quasar lies directly in the same X-ray
filament which extends from the nucleus out 4.1 arcmin to end on the quasar of
z=2.15. The chain of objects SW along the minor axis of NGC3628 has been imaged
in four colors with the VLT. Images and spectra of individual objects within
the filament are reported. It is suggested that material in various physical
states and differing intrinsic redshifts is ejected out along the minor axis of
this active, disturbed galaxy.Comment: 8 pages, 5 figures. Accepted for publication in A&A. Postscript file
including full resolution figures at
http://www.eso.org/~fpatat/ngc3628/paper_ngc3628.ps.g
The Discovery of a High Redshift X-ray Emitting QSO Very Close to the Nucleus of NGC 7319
A strong X-ray source only 8" from the nucleus of the Sy2 galaxy NGC 7319 in
Stephan's Quintet has been discovered by Chandra. We have identified the
optical counterpart and show it is a QSO with . It is also a ULX
with . From the optical spectra of the QSO
and interstellar gas in the galaxy (z = .022) we show that it is very likely
that the QSO and the gas are interacting.Comment: 8 figures, 5 color, minimized ps siz
Evidence for Intrinsic Redshifts in Normal Spiral Galaxies
The Tully-Fisher Relationship (TFR) is utilized to identify anomalous
redshifts in normal spiral galaxies. Three redshift anomalies are identified in
this analysis: (1) Several clusters of galaxies are examined in which late type
spirals have significant excess redshifts relative to early type spirals in the
same clusters, (2) Galaxies of morphology similar to ScI galaxies are found to
have a systematic excess redshift relative to the redshifts expected if the
Hubble Constant is 72 km s-1 Mpc-1, (3) individual galaxies, pairs, and groups
are identified which strongly deviate from the predictions of a smooth Hubble
flow. These redshift deviations are significantly larger than can be explained
by peculiar motions and TFR errors. It is concluded that the redshift anomalies
identified in this analysis are consistent with previous claims for large
non-cosmological (intrinsic) redshifts.Comment: Accepted for publication at Astrophysics&Space Science. 36 pages
including 8 tables and 7 figure
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