Search Publications
Suzaku Observation of the High-inclination Binary EXO 0748-676 in the Hard State
Makishima, Kazuo; Nakazawa, Kazuhiro; Xu, Haiguang +4 more
Utilizing archived Suzaku data acquired on 2007 December 25 for 46 ks, the X-ray spectroscopic properties of the dipping and eclipsing low-mass X-ray binary EXO 0748-676 were studied. At an assumed distance of 7.1 kpc, the data provided a persistent unabsorbed luminosity of 3.4× {10}36 erg cm-2 s-1 in 0.6-55 keV. T…
Protostars at Low Extinction in Orion A
Lada, Charles J.; Lewis, John Arban
In the list of young stellar objects (YSOs) compiled by Megeath et al. for the Orion A molecular cloud, only 44 out of 1208 sources found projected onto low extinction ({A}{{K}}\lt 0.8 mag) gas are identified as protostars. These objects are puzzling because protostars are not typically expected to be associated with extended low extinc…
IGR J17451-3022: A dipping and eclipsing low mass X-ray binary
Ponti, G.; Romano, P.; Ferrigno, C. +10 more
In this paper we report on the available X-ray data collected by INTEGRAL, Swift, and XMM-Newton during the first outburst of the INTEGRAL transient IGR J17451-3022, discovered in 2014 August. The monitoring observations provided by the JEM-X instruments on board INTEGRAL and the Swift /XRT showed that the event lasted for about 9 months and that …
Polytropic index of magnetosheath ions based on homogeneous MHD Bernoulli Integral
Ma, Yuduan; Cao, Jinbin; Pang, Xuexia
This paper uses Cluster data during the period from 2001 to 2010 to study the polytropic processes of magnetosheath ions. Utilizing the method of homogeneous magnetohydrodynamic (MHD) Bernoulli integral (MBI), we first identify streamflow tubes, then use the constant of polytropic relation to guarantee that the streamflow tube experiences an uncha…
A High-resolution Multiband Survey of Westerlund 2 with the Hubble Space Telescope. II. Mass Accretion in the Pre-main-sequence Population
Grebel, Eva K.; Bonanos, Alceste Z.; Sabbi, Elena +5 more
We present a detailed analysis of the pre-main-sequence (PMS) population of the young star cluster Westerlund 2 (Wd2), the central ionizing cluster of the H II region RCW 49, using data from a high-resolution multiband survey with the Hubble Space Telescope. The data were acquired with the Advanced Camera for Surveys in the F555W, F814W, and F658N…
GW Librae: Still Hot Eight Years Post-outburst
Szkody, Paula; Sion, Edward M.; Gänsicke, Boris T. +8 more
We report continued Hubble Space Telescope (HST) ultraviolet spectra and ground-based optical photometry and spectroscopy of GW Librae eight years after its largest known dwarf nova outburst in 2007. This represents the longest cooling timescale measured for any dwarf nova. The spectra reveal that the white dwarf still remains about 3000 K hotter …
On the Host Galaxy of GRB 150101B and the Associated Active Galactic Nucleus
Liu, Tong; Wang, Junfeng; Fang, Taotao +2 more
We present a multi-wavelength analysis of the host galaxy of short-duration gamma-ray burst (GRB) 150101B. Follow-up optical and X-ray observations suggested that the host galaxy, 2MASX J12320498-1056010, likely harbors low-luminosity active galactic nuclei (AGNs). Our modeling of the spectral energy distribution has confirmed the nature of the AG…
X-rays associated with the jet-cloud-interacting radio galaxy 3C 277.3 (Coma A): implications for energy deposition
Young, A. J.; Birkinshaw, M.; Worrall, D. M.
We report the discovery with Chandra of X-ray-emitting gas associated with the jet-cloud interaction in the radio galaxy 3C 277.3 (Coma A), a source that falls in the most important power range for radio-mode feedback in the Universe. This hot gas, heated by the jet, dominates the mass of the cloud which is responsible for an extreme projected def…
Investigating the cores of fossil systems with Chandra
Bharadwaj, V.; Sanders, J. S.; Reiprich, T. H. +1 more
Aims: We aim to systematically investigate the cores of a sample of fossil galaxy groups and clusters ("fossil systems"), using Chandra data, to see what hints they can offer about the properties of the intracluster medium in these particular objects.
Methods: We chose a sample of 17 fossil systems from literature with archival Chandra d…
The color ratio-intensity relation in the Jovian aurora: Hubble observations of auroral components
Bonfond, B.; Gérard, J. -C.; Grodent, D. +1 more
Spectral observations made with the long slit of the Space Telescope Imaging Spectrograph (STIS) on board Hubble have been used to construct spectral maps of the FUV Jovian aurora. They reveal that the amount of absorption by overlying methane shows significant spatial variations. In this report, we examine the relationship between the auroral bri…