928 research outputs found
The nature of the ultraluminous X-ray sources inside galaxies and their relation to local QSOs
It is suggested that many of the ultraluminous compact x-ray sources now
being found in the main bodies of galaxies, particularly those that are active,
like M82, NGC 3628 and others, are "local" QSOs, or BL Lac objects, with high
intrinsic redshifts in the process of being ejected from those galaxies.
Evidence in support of this hypothesis is summarized.Comment: submitted to A&A Letter
Ionized gas in the nuclei of elliptical, so, spiral, and irregular galaxies
Ionized gas in elliptical, SO, spiral, and irregular galaxy nucle
Ultraviolet emission from galaxies
Ultraviolet radiation emission from normal elliptical, spiral, and irregular galaxie
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
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
On quasar host galaxies as tests of non-cosmological redshifts
Despite a general consensus in the astronomical community that all quasars
are located at the distances implied by their redshifts, a number of
observations still challenge this interpretation, possibly indicating that some
subpopulation of quasars may harbour significant redshift components not
related to the expansion of the universe. It has been suggested that these
objects may have been ejected from local galaxies and are likely to evolve into
new galaxies themselves. Here, a test of such exotic scenarios is proposed,
based on the spectral energy distribution of the galaxies hosting quasars with
suspected ejection origin. Provided that the time scales over which the ejected
objects manifest themselves as quasars is short, one would in the framework of
ejection scenarios expect to find either no quasar host galaxy, a pseudo-host
consisting of gas ionized by the quasar, or a host galaxy consisting of young
stars only. It is argued that the spectral energy distributions corresponding
to the latter two options should differ significantly from those of most quasar
host galaxies detected at low redshift so far, thus providing a potential test
of the claimed existence of ejected quasars. A minimal implementation of this
test, involving optical and near-IR broadband photometry, is suggested.Comment: 9 pages, 4 figure
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
The double radio source 3C343.1: A galaxy-QSO pair with very different redshifts
The strong radio source 3C343.1 consists of a galaxy and a QSO separated by
no more than about 0.25 arcsec. The chance of this being an accidental
superposition is conservatively 10^-8. The z=0.344 galaxy is connected to the
z=0.750 QSO by a radio bridge. The numerical relation between the two redshifts
is that predicted from previous associations. This pair is an extreme example
of many similar physical associations of QSOs and galaxies with very different
redshifts.Comment: A&A Letters in pres
Synthesis of the Elements in Stars
Man inhabits a universe composed of a great variety of elements and their isotopes. In Table I,1 a count of the stable and radioactive elements and isotopes is listed. Ninety elements are found terrestrially and one more, technetium, is found in stars; only promethium has not been found in nature
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