158 research outputs found
Recent X-Ray Observations of SN1986J with ASCA and ROSAT
We present ASCA and ROSAT observations of SN 1986J covering the period 1991
August to 1996 January. From observations with the ROSAT HRI and PSPC, we find
that the 0.5-2.5 keV flux decreased proportional to during this
period; the ASCA data are consistent with this result and extend it to the 2-10
keV band. ASCA spectra from 1994 January and 1996 January are consistent with
thermal emission from a solar metallicity plasma at an equilibrium temperature
kT = 5-7.5 keV, somewhat hotter than that observed from other X-ray supernovae.
These spectra also show a clear Fe K emission line at 6.7 keV with FWHM <
20,000 km/s (90% confidence). This limit on the line width is consistent with
the reverse shock model of Chevalier & Fransson (1994), but does not rule out
the clumpy wind model of Chugai (1993).Comment: 20 pages, 9 postscript figures, latex, uses aastex4.0, submitted to
The Astrophysical Journa
RXTE, ROSAT and ASCA Observations of G347.3-0.5 (RX J1713.7-3946): Probing Cosmic Ray Acceleration by a Galactic Shell-Type Supernova Remnant
(Abridged) We present an analysis of the X-ray spectrum of the Galactic
shell-type supernova remnant (SNR) G347.3-0.5 (RX J1713.7-3946). By performing
a joint spectral analysis of data from observations made of G347.3-0.5 using
the ROSAT PSPC, the ASCA GIS and the RXTE PCA, we have fit the spectra of
particular regions of this SNR (including the bright northwestern and
southwestern rims, the northeastern rim and the interior diffuse emission) over
the approximate energy range of 0.5 through 30 keV. Based on the parameters of
the best fit to the spectra using the SRCUT model, we estimate the maximum
energy of cosmic-ray electrons accelerated by the rims of G347.3-0.5 to be
19-25 TeV, assuming a magnetic field strength of 10 microGauss. We present a
broadband (radio to gamma-ray) photon energy flux-spectrum for the northwestern
rim of the SNR, using a synchrotron-inverse Compton model with a variable
magnetic field strength to fit the spectrum. Our fit derived from this model
yields a maximum energy of only 8.8 TeV for the accelerated cosmic-ray
electrons and a magnetic field strength of 150 microGauss. However, our derived
ratio of volumes for TeV emission and X-ray emission (approximately 1000) is
too large to be physically acceptable. We argue that neither non-thermal
bremsstrahlung nor neutral pion decay can adequately describe the TeV emission
from this rim, and therefore the physical process responsible for this emission
is currently uncertain. Finally, we compare the gross properties of G347.3-0.5
with other SNRs known to possess X-ray spectra dominated by non-thermal
emission.Comment: 46 pages, 16 figures, accepted for publication in the Astrophysical
Journal (Volume 593, 10 August 2003 Issue
Spitzer Infrared Spectrograph Observations of M, L, and T Dwarfs
We present the first mid-infrared spectra of brown dwarfs, together with
observations of a low-mass star. Our targets are the M3.5 dwarf GJ 1001A, the
L8 dwarf DENIS-P J0255-4700, and the T1/T6 binary system epsilon Indi Ba/Bb. As
expected, the mid-infrared spectral morphology of these objects changes rapidly
with spectral class due to the changes in atmospheric chemistry resulting from
their differing effective temperatures and atmospheric structures. By taking
advantage of the unprecedented sensitivity of the Infrared Spectrograph on the
Spitzer Space Telescope we have detected the 7.8 micron methane and 10 micron
ammonia bands for the first time in brown dwarf spectra.Comment: 4 pages, 2 figure
Discovery of a Bright Field Methane (T-type) Brown Dwarf by 2MASS
We report the discovery of a bright (J = 13.830.03) methane brown dwarf,
or T dwarf, by the Two Micron All Sky Survey. This object, 2MASSI
J0559191-140448, is the first brown dwarf identified by the newly commissioned
CorMASS instrument mounted on the Palomar 60-inch Telescope. Near-infrared
spectra from 0.9 - 2.35 \micron show characteristic CH bands at 1.1, 1.3,
1.6, and 2.2 \micron, which are significantly shallower than those seen in
other T dwarfs discovered to date. Coupled with the detection of an FeH band at
0.9896 \micron and two sets of K I doublets at J-band, we propose that 2MASS
J0559-14 is a warm T dwarf, close to the transition between L and T spectral
classes. The brightness of this object makes it a good candidate for detailed
investigation over a broad wavelength regime and at higher resolution.Comment: 21 pages, 3 figures, 2 tables, accepted to AJ for publication August
200
Near-infrared spectroscopy of the Blue Compact Dwarf galaxy Markarian 59
We present near-infrared (NIR) spectroscopic observations of the blue compact
dwarf (BCD) galaxy Mrk 59, obtained with the TripleSpec spectrograph mounted on
the 3.5m APO telescope. The NIR spectrum of Mrk 59, which covers the 0.90 -
2.40 micron wavelength range, shows atomic hydrogen, molecular hydrogen,
helium, sulfur and iron emission lines. The NIR data have been supplemented by
a SDSS optical spectrum. We found extinction in the BCD to be low [A(V)=0.24
mag] and to be the same in both the optical and NIR ranges. The NIR light does
not reveal hidden star formation. The H2 emission comes from dense clumps and
the H2 vibrational emission line intensities can be accounted for by photon
excitation. No shock excitation is needed. A CLOUDY photoinization model of Mrk
59 reproduces well the observed optical and NIR emission line fluxes. There is
no need to invoke sources of ionization other than stellar radiation.The [FeII]
1.257 and 1.643 micron emission lines, often used as supernova shock indicators
in low-excitation high-metallicity starburst galaxies, cannot play such a role
in high-excitation low-metallicity HII regions such as Mrk 59.Comment: 23 pages, 3 figures, accepted for publication in the Astrophysical
Journa
Examination of oral cancer biomarkers by tissue microarray analysis.
OBJECTIVE: To validate the DNA microarray results on a subset of genes that could potentially serve as biomarkers of oral squamous cell carcinoma (OSCC) by examining their expression with an alternate quantitative method and by assessing their protein levels. DESIGN: Based on DNA microarray data from our laboratory and data reported in the literature, we identified 6 potential biomarkers of OSCC to investigate further. We used quantitative real-time polymerase chain reaction to examine expression changes of CDH11, MMP3, SPARC, POSTN, TNC, and TGM3 in OSCC and histologically normal control tissues. We further examined validated markers at the protein level by immunohistochemical analysis of OSCC tissue microarray sections. RESULTS: Quantitative real-time polymerase chain reaction analysis revealed upregulation of CDH11, SPARC, POSTN, and TNC gene expression and decreased TGM3 expression in OSCC tissue compared with control tissue; MMP3 was not found to be differentially expressed. In tissue microarray immunohistochemical analyses, SPARC (secreted protein, acidic, rich in cysteine), periostin, and tenascin C exhibited increased protein expression in tumor tissue compared with control tissue, and their expression was primarily localized within tumor-associated stroma rather than tumor epithelium. Conversely, transglutaminase 3 protein expression was found only within keratinocytes in control tissue and was significantly downregulated in cancer cells. CONCLUSIONS: Of 6 potential gene markers of OSCC, initially identified by DNA microarray analyses, differential expression of CDH11, SPARC, POSTN, TNC, and TGM3 were validated by quantitative real-time polymerase chain reaction. Differential expression and localization of proteins encoded by SPARC, POSTN, TNC, and TGM3 were clearly shown by tissue microarray immunohistochemical analysis
Double-Peaked X-Ray Lines from the Oxygen/Neon-Rich Accretion Disk in 4U1626-67
We report on a 39 ks observation of the 7.7-s low-mass X-ray binary pulsar
4U1626-67 with the High Energy Transmission Grating Spectrometer (HETGS) on the
Chandra X-Ray Observatory. This ultracompact system consists of a
disk-accreting magnetic neutron star and a very low mass, hydrogen-depleted
companion in a 42-min binary. We have resolved the previously reported Ne/O
emission line complex near 1 keV into Doppler pairs of broadened (2500 km/s
FWHM) lines from highly ionized Ne and O. In most cases, the blue and red line
components are of comparable strength, with blueshifts of 1550-2610 km/s and
redshifts of 770-1900 km/s. The lines appear to originate in hot (10^6 K),
dense material just below the X-ray-heated skin of the outer Keplerian
accretion disk, or else possibly in a disk wind driven from the pulsar's
magnetopause. The observed photoelectric absorption edges of Ne and O appear
nearly an order of magnitude stronger than expected from interstellar material
and are likely formed in cool, metal-rich material local to the source. Based
on the inferred local abundance ratios, we argue that the mass donor in this
binary is probably the 0.02 M_sun chemically fractionated core of a C-O-Ne or
O-Ne-Mg white dwarf which has previously crystallized.Comment: 9 pages. Accepted for publication in ApJ. Table 2 correcte
Models for Nonthermal Photon Spectra
We describe models of nonthermal photon emission from a homogeneous
distribution of relativistic electrons and protons. Contributions from the
synchrotron, inverse Compton, nonthermal bremsstrahlung and neutral-pion decay
processes are computed separately using a common parameterization of the
underlying distribution of nonthermal particles. The models are intended for
use in fitting spectra from multi-wavelength observations and are designed to
be accurate and efficient. Although our applications have focused on Galactic
supernova remnants, the software is modular, making it straightforward to
customize for different applications. In particular, the shapes of the particle
distribution functions and the shape of the seed photon spectrum used by the
inverse Compton model are defined in separate modules and may be customized for
specific applications. We assess the accuracy of these models by using a
recurrence relation and by comparing them with analytic results and with
previous numerical work by other authors.Comment: 14 pages, 7 figures, Accepted for publication in ApJ Supplemen
Metropolitan Briefing Book, 2007
The Institute of Portland Metropolitan Studies (IMS) was created to connect the resources of higher education to the needs of the six-county, bit-state Portland-Vancouver metropolitan area (Clackamas, Clark, Columbia, Multnomah, Washington, and Yamhill Counties). In this spirit, we offer our 2007 Metropolitan Briefing Book. Our theme is regional variety. Variety has been touted as the very spice of life (William Cowper) and as the mother of enjoyment (Vivan Grey). Our region enjoys a good deal of variety--in its landscapes, in its economy, and in its people, their cultures, and their attitudes. These differences are important to local vitality and beauty. But while we generally view this variety as positive, we also worry about equity. Although we promote regional thought and action, we must understand that each community experiences the problems facing us in a slightly different way and often with significantly different resources
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