Paper: astro-ph/0508005
Date: Fri, 29 Jul 2005 21:24:34 GMT (158kb)

Title: Initial Populations of Black Holes in Star Clusters

Authors: K.Belczynski, A.Sadowski, F. Rasio and T.Bulik

Comments: 34 pages, 8 tables, 17 figures; submitted to ApJ
\\
Using an updated population synthesis code we study the formation and
evolution of black holes (BHs) in young star clusters following a massive
starburst. This study continues and improves on the initial work described by
Belczynski, Sadowski & Rasio (2004). In our new calculations we account for the
possible ejections of BHs and their progenitors from clusters because of natal
kicks imparted by supernovae and recoil following binary disruptions. The
results indicate that the properties of both retained BHs in clusters and
ejected BHs (forming a field population) depend sensitively on the depth of the
cluster potential. In particular, most BHs ejected from binaries are also
ejected from clusters with central escape speeds Vesc < 100 km/s. Conversely,
most BHs remaining in binaries are retained by clusters with Vesc > 10 km/s.
BHs from single star evolution are also affected significantly: about half of
the BHs originating from primordial single stars are ejected from clusters with
Vesc < 50 km/s. Our results lay a foundation for theoretical studies of the
formation of BH X-ray binaries, including possible `ultra-luminous'' sources,
as well as merging BH--BH binaries detectable with future gravitational-wave
observatories.

\\ ( http://arXiv.org/abs/astro-ph/0508005 , 158kb)
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Paper: astro-ph/0508021
Date: Mon, 1 Aug 2005 05:22:16 GMT (34kb)

Title: Captures of Red Giant Stars by Black Holes in Elliptical Galaxies:
Feedback to the Hot Gas

Authors: J.-M. Wang (IHEP, Beijing) & C. Hu (NAOC, Beijing)

Comments: 4 pages in emulateapj5.sty. to Appear in ApJ Letters
\\
The highly disturbed hot gas in elliptical galaxies, as revealed in many {\em
Chandra} X-ray images, implies a source of energy in the galactic nucleus. In
some elliptical galaxies faint X-ray ``ghost'' cavities appear without
corresponding radio lobes. It has been suggested that ghost cavities are caused
by short-lived activity with a timescale of $\sim 10^3-10^4$ years, but this is
difficult to understand within the popular paradigm of active galactic nuclei.
We suggest an episode model for ghost cavities, invoking captures of red giant
stars by the black hole located at the center of the elliptical galaxies at a
typical rate of $10^{-5}$yr$^{-1}$ per galaxy. The accretion of tidally
disrupted red giant stars onto the black hole powers activity in a timescale of
a few years. The total energy channeled into the jet/outflow during the cooling
time of the hot gas is $\sim 10^{56}$ erg, which is the typical work required
to form the observed cavities. In this scenario, the faint cavities are
produced by the feedback following accretion of the debris of the captured red
giant stars onto the black holes. We apply the present model to several
elliptical galaxies and find that it can explain the formation of the ghost
cavities. This model can be tested in the future by comparisons between radio
and X-ray observations.

\\ ( http://arXiv.org/abs/astro-ph/0508021 , 34kb)

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Paper: astro-ph/0508035
Date: Mon, 1 Aug 2005 12:42:39 GMT (250kb)

Title: Probing the birth of the first quasars with the future far infrared
mission

Authors: M.J. Page (MSSL/Ucl)

Comments: 7 pages, 5 figures, to be published in the Proc. of the 39th ESLAB
Symosium, 19-21 April 2005
\\
It is now widely recognised that massive black holes must have had a
fundamental influence on the formation of galaxies and vice versa. With current
and imminent missions we aim to unravel much of this relationship for the last
10 Gyr of cosmic history, while the quasar population waned and star formation
died down. The picture at earlier times will be more difficult to reconstruct,
but will likely be even more exciting: when the first stars shone, the first
dust was formed, and quasars were a vigorously rising population. One of the
primary goals of XEUS is to allow us to find and study the earliest quasars,
however deeply buried in gas and dust they may be. But to understand fully the
astrophysical context of these objects, their significance in the grand
picture, we must learn how they relate to their environments and their host
galaxies. The ESA future Far-InfraRed Mission (FIRM) will provide much of the
data we require, revealing the dust heated by star formation in the host
galaxy, the relative evolutionary stages of spheroid and black hole, and the
total energy budgets posessed by these first quasars. FIRM will reveal star
formation in the immediate proto-cluster environment of the quasar and so tell
us how the formation of the first galaxies and quasars coupled to the earliest
large scale structures.

\\ ( http://arXiv.org/abs/astro-ph/0508035 , 250kb)

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Paper: astro-ph/0506100
replaced with revised version Sat, 30 Jul 2005 04:36:17 GMT (39kb)

Title: Supernova Neutrino-Effects on R-Process Nucleosynthesis in Black Hole
Formation

Authors: T. Sasaqui, T. Kajino, and A. B. Balantekin

Comments: ApJ (2005) in press, 24pages, 8figures

\\ ( http://arXiv.org/abs/astro-ph/0506100 , 39kb)

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Paper: astro-ph/0506725
replaced with revised version Mon, 1 Aug 2005 15:58:56 GMT (49kb)

Title: Hubble Space Telescope ultraviolet spectroscopy of blazars: emission
lines properties and black hole masses

Authors: Elena Pian (1), Renato Falomo (2), Aldo Treves (3) ((1) INAF,
Astronomical Observatory of Trieste, Italy, (2) INAF, Astronomical
Observatory of Padova, Italy, (3) Department of Physics and Mathematics,
University of Insubria, Italy)

Comments: published in MNRAS (small changes with respect to preprint previously
submitted)
Journal-ref: MNRAS, 361, 919-926 (2005)

\\ ( http://arXiv.org/abs/astro-ph/0506725 , 49kb)

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