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AXJ1749.1-2733 and AXJ1749.2-2725 - the close pair of X-ray pulsars behind the Galactic Centre: an optical identification
Lutovinov, A. A.; Karasev, D. I.; Burenin, R. A.
Two faint X-ray pulsars, AXJ1749.2-2725 and AXJ1749.1-2733, located in the direction of the Galactic Centre, were studied in detail using data from the INTEGRAL, XMM-Newton and Chandra observatories in X-rays, the SOFI/NTT instrument in the infrared and the RTT150 telescope in the optical. X-ray positions of both sources were determined with an un…
The Kyoto Tridimensional Spectrograph II on Subaru and the University of Hawaii 88 in Telescopes
Ishii, M.; Sugai, H.; Ishigaki, T. +11 more
In order to investigate physical conditions of ionized gas in galaxies, as well as its kinematics, we have developed the Kyoto tridimensional spectrograph II. It is a multimode optical instrument, including integral field spectrograph (IFS) and Fabry-Perot imager modes. We have designed it compact so that we can mount it on 2 m class telescopes as…
Observational Study of the Multistructured Planetary Nebula NGC 7354
Miranda, L. F.; Vázquez, R.; Olguín, L. +3 more
We present an observational study of the planetary nebula (PN) NGC 7354 consisting of narrowband Hα and [N II]λ6584 imaging as well as low- and high-dispersion long-slit spectroscopy, and VLA-D radio continuum. According to our imaging and spectroscopic data, NGC 7354 has four main structures: a quite round outer shell and an elliptical inner shel…
A very young component in the pre-eminent starburst region of the Small Magellanic Cloud
Heydari-Malayeri, M.; Selier, R.
Context. Despite extensive research on various components of the N66/NGC 346 complex, few studies have so far focused on N66A, which is a special object in the whole complex and therefore deserves scrutiny. The study of this compact H ii region and its fellow objects seems important in the framework of massive star formation in the Magellanic Clou…
The Evolution of the Twist Shear and Dip Shear During X-class Flare of 2006 December 13: Hinode Observations
Gosain, Sanjay; Venkatakrishnan, P.
The non-potentiality of solar magnetic fields is traditionally measured in terms of a magnetic shear angle, i.e., the angle between the observed and potential field azimuths. Here, we introduce another measure of the shear that has not been previously studied in solar active regions, i.e., the one that is associated with the inclination angle of t…
X-Ray Studies of HESS J1809-193 with Suzaku
Dotani, Tadayasu; Ebisawa, Ken; Bamba, Aya +1 more
Suzaku observed the region including HESS J1809-193, a TeV unidentified source, and confirmed the existence of extended hard X-ray emission previously reported by ASCA, as well as hard X-ray emission from PSR J1809-1917 in this region. A one-dimensional profile of the diffuse emission is represented along with a Gaussian model with a best-fit σ of…
Detection of Highly Ionized C IV Gas Within the Local Cavity
Welsh, Barry Y.; Lallement, Rosine; Wheatley, Jonathan +1 more
We present high resolution (R = 114,000) ultraviolet measurements of the interstellar absorption line profiles of the C IV (1550 Å) high ionization doublet recorded toward the nearby B2Ve star HD 158427 (d ~ 74 pc). These data, which were recorded with the recently re-furbished Space Telescope Imaging Spectrograph instrument on the Hubble Space Te…
An X-ray study of the SNR G344.7-0.1 and the central object CXOU J170357.8-414302
Combi, J. A.; Luque-Escamilla, P. L.; Pérez-González, P. G. +7 more
Aims: We report results of an X-ray study of the supernova remnant (SNR) G344.7-0.1 and the point-like X-ray source located at the geometrical center of the SNR radio structure.
Methods: The morphology and spectral properties of the remnant and the central X-ray point-like source were studied using data from the XMM-Newton and Chandra sa…
Dust Obscuration in Lyman Break Galaxies at z ~ 4
Ho, I. -Ting; Wang, Wei-Hao; Morrison, Glenn E. +1 more
Measuring star formation rates (SFRs) in high-z galaxies with their rest-frame ultraviolet (UV) continuum can be uncertain because of dust obscuration. Prior studies had used the submillimeter emission at 850 µm to determine the intrinsic SFRs of rest-frame UV-selected galaxies, but the results suffered from the low sensitivity and poor reso…
Ionized gas outflow in the isolated S0 galaxy NGC 4460
Kaisin, Serafim; Karachentsev, Igor; Moiseev, Alexei
We used integral-field and long-slit spectroscopy to study a bright extended nebulosity recently discovered in the isolated lenticular galaxy NGC 4460 during an Hα survey of nearby galaxies. An analysis of archival Sloan Digital Sky Survey, GALEX and Hubble Space Telescope images indicates that current star formation is entirely concentrated in th…