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The X-ray variability history of Markarian 3
Guainazzi, M.; Miniutti, G.; La Parola, V. +2 more
Context. The unified scenario for active galactic nuclei (AGN) postulates that our orientation with respect to a parsec-scale azimuthally-symmetric gas and dust system causes the difference in their phenomenology in the optical/UV and X-ray bands. Only recently have high-resolution radio (VLBI) and IR interferometric observations provided direct c…
Spatially Resolved HST Grism Spectroscopy of a Lensed Emission Line Galaxy at z ~ 1
Broadhurst, Tom; Frye, Brenda L.; Bowen, David V. +6 more
We take advantage of gravitational lensing amplification by A1689 (z = 0.187) to undertake the first space-based census of emission line galaxies (ELGs) in the field of a massive lensing cluster. Forty-three ELGs are identified to a flux of i 775 = 27.3 via slitless grism spectroscopy. One ELG (at z = 0.7895) is very bright owing to len…
The Central Blue Straggler Population in Four Outer-halo Globular Clusters
Lützgendorf, Nora; Ferraro, Francesco R.; Lanzoni, Barbara +6 more
Using Hubble Space Telescope/Wide Field Planetary Camera 2 data, we have performed a comparative study of the Blue Straggler Star (BSS) populations in the central regions of the globular clusters (GCs) AM 1, Eridanus, Palomar 3, and Palomar 4. Located at distances R GC > 50 kpc from the Galactic center, these are (together with Palom…
Detection of the 3.3 µm Aromatic Feature in the Supernova Remnant N49 with AKARI
Onaka, Takashi; Seok, Ji Yeon; Koo, Bon-Chul
We present an infrared (IR) study of the supernova remnant (SNR) N49 in the Large Magellanic Cloud with the near-IR (NIR; 2.5-5 µm) spectroscopic observations performed by AKARI. The observations were performed as a coarse spectral mapping to cover most of the bright region in the east, which enables us to compare the distribution of various…
Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822
Bono, G.; Pietrinferni, A.; Monelli, M. +3 more
On the basis of a new photometric analysis of the Local Group dwarf irregular galaxy NCG 6822 based on observations obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope, we have obtained a new estimate of the extinction of two fields located in the southeast region of the galaxy. Because of significant differences in th…
Determining the full magnetic field gradient from two spacecraft measurements under special constraints
Dunlop, M.; Rong, Z. J.; Shen, C.
In this exploration, it is revealed for the first time that the full magnetic field gradient and current density distribution can be derived from two spacecraft magnetic field measurements under the assumptions that the magnetic field is approximately stationary and force-free, conditions which are particularly relevant to low altitude regions of …
Near-infrared Survey of the GOODS-North Field: Search for Luminous Galaxy Candidates at z >~ 6.5
Ferguson, Henry C.; Hathi, Nimish P.; Mobasher, Bahram +2 more
We present near-infrared (NIR; J and K s) survey of the Great Observatories Origins Deep Survey-North (GOODS-N) field. The publicly available imaging data were obtained using the MOIRCS instrument on the 8.2 m Subaru and the WIRCam instrument on the 3.6 m Canada-France-Hawaii Telescope (CFHT). These observations fulfill a serious wavele…
Chandra and Hubble Space Telescope Observations of the Supersoft ULX in NGC 247: Candidate for Standard Disk Emission
Tao, Lian; Feng, Hua; Grisé, Fabien +2 more
We report on multiwavelength observations of the supersoft ultraluminous X-ray source (ULX) in NGC 247 made with the Chandra X-Ray Observatory and Hubble Space Telescope. We aligned the X-ray and optical images using three objects present on both and identified a unique, point-like optical counterpart to the ULX. The X-ray to optical spectrum is w…
Test of Shi et al. method to infer the magnetic reconnection geometry from spacecraft data: MHD simulation with guide field and antiparallel kinetic simulation
Hesse, M.; Birn, J.; Drake, J. F. +3 more
When analyzing data from an array of spacecraft (such as Cluster or MMS) crossing a site of magnetic reconnection, it is desirable to be able to accurately determine the orientation of the reconnection site. If the reconnection is quasi-two dimensional, there are three key directions, the direction of maximum inhomogeneity (the direction across th…
The Dwarf Starburst Host Galaxy of a Type Ia Supernova at z = 1.55 from CANDELS
Mobasher, Bahram; Riess, Adam G.; Hjorth, Jens +4 more
We present VLT/X-shooter observations of a high-redshift, Type Ia supernova (SN Ia) host galaxy, discovered with HST/WFC3 as part of the CANDELS Supernova project. The galaxy exhibits strong emission lines of Lyα, [O II], Hβ, [O III], and Hα at z = 1.54992+0.00008 -0.00004. From the emission-line fluxes and spectral energy di…