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Observations of Cygnus X-1 in the MeV band by the INTEGRAL imager
Walter, R.; Xu, M.
Context. The spectrum of the MeV tail detected in the black-hole candidate Cygnus X-1 remains controversial as it appeared much harder when observed with the INTEGRAL Imager IBIS than with the INTEGRAL spectrometer SPI or CGRO.
Aims: We present an independent analysis of the spectra of Cygnus X-1 observed by IBIS in the hard and soft states. …
Development and Parameters of a Non-Self-Similar CME Caused by the Eruption of a Quiescent Prominence
Grechnev, V. V.; Kuzmenko, I. V.
The eruption of a large quiescent prominence on 17 August 2013 and an associated coronal mass ejection (CME) were observed from different vantage points by the Solar Dynamics Observatory (SDO), the Solar-Terrestrial Relations Observatory (STEREO), and the Solar and Heliospheric Observatory (SOHO). Screening of the quiet Sun by the prominence produ…
On the lensed blazar B0218+357
Falomo, R.; Treves, A.; Scarpa, R. +2 more
We present an optical spectrum (λλ4000-10 500) of the lensed blazar B0218+357 secured at the 10 m GTC and aimed to investigate and clarify the properties of this intriguing system. We found that the emission line spectrum of the blazar is characterized by only one broad emission line that interpreted as Mg II 2800 Å yields z = 0.95. In addition, w…
Anomalous Surge of the White-Light Corona at the Onset of the Declining Phase of Solar Cycle 24
Lamy, P.; Vibert, D.; Wojak, J. +1 more
In late 2014, when the current Solar Cycle 24 entered its declining phase, the white-light corona as observed by the LASCO-C2 coronagraph underwent an unexpected surge that increased its global radiance by 60%, reaching a peak value comparable to the peak values of the more active Solar Cycle 23. A comparison of the temporal variation of the white…
The M 4 Core Project with HST - V. Characterizing the PSFs of WFC3/UVIS by focus★
Anderson, J.; Bedin, L. R.
As part of the astrometric Hubble Space Telescope (HST) large program GO-12911, we conduct an in-depth study to characterize the point spread function (PSF) of the Uv-VISual channel of the Wide Field Camera 3 (WFC3), as a necessary step to achieve the astrometric goals of the program. We extracted a PSF from each of the 589 deep exposures taken th…
X Marks the Spot: Nexus of Filaments, Cores, and Outflows in a Young Star-forming Region
Bieging, John H.; Lombardi, Marco; Kong, Shuo +4 more
We present a multiwavelength investigation of a region of a nearby giant molecular cloud that is distinguished by a minimal level of star formation activity. With our new {}12{CO}(J = 2-1) and {}13{CO}(J = 2-1) observations of a remote region within the middle of the California molecular cloud, we aim to investigate the relat…
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. X. HD 96511, HR 7578, and KZ Andromedae
Henry, Gregory W.; Fekel, Francis C.; Tomkin, Jocelyn
From an extensive number of newly acquired radial velocities we determine the orbital elements for three late-type dwarf systems, HD 96511, HR 7578, and KZ And. The orbital periods are 18.89737 ± 0.00002, 46.81610 ± 0.00006, and 3.0329113 ± 0.0000005 days, respectively, and all three systems are eccentric, although KZ And is just barely so. We hav…
Dust properties of the cometary globule Barnard 207 (LDN 1489)
Togi, Aditya; Witt, Adolf N.; John, Demi St.
Barnard 207 (B207, LDN 1489, LBN 777), also known as the Vulture Head nebula, is a cometary globule in the Taurus-Auriga-Perseus molecular cloud region. B207 is known to host a Class I protostar, IRAS 04016+2610, located at a projected distance of 8400 au from the dense core centre. Using imaging and photometry over a wide wavelength range, from U…
Radio observations of the region around the pulsar wind nebula HESS J1303-631 with ATCA
Johnston, Simon; Sushch, Iurii; Oya, Igor +2 more
Radio observations of the region surrounding PSR J1301-6305 at 5.5 GHz and 7.5 GHz were conducted with ATCA on September 5, 2013. The observations were dedicated to the search of the radio counterpart of the evolved pulsar wind nebula (PWN) HESS J1303-631, which has been detected in X-rays and GeV-TeV γ-rays. The collected data do not reveal any s…
Deep Chandra observations of NGC 7457, the X-ray point source populations of a low-mass early-type galaxy
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +4 more
We present the X-ray point source population of NGC 7457 based on 124 ks of Chandra observations. Previous deep Chandra observations of low-mass X-ray binaries (LMXBs) in early-type galaxies have typically targeted the large populations of massive galaxies. NGC 7457 is a nearby, early-type galaxy with a stellar luminosity of 1.7× 10^{10}{L_{K{⊙}}}…