Search Publications
The 2016 Outburst of PSR J1119-6127: Cooling and a Spin-down-dominated Glitch
Scholz, P.; Kaspi, V. M.; Tendulkar, S. P. +1 more
We report on the aftermath of a magnetar outburst from the young, high magnetic field radio pulsar PSR J1119-6127 that occurred on 2016 July 27. We present the results of a monitoring campaign using the Neil Gehrels Swift X-ray Telescope, NuSTAR, and XMM-Newton. After reaching a peak absorbed 0.5-10 keV flux of {45}-7+5× {10}…
No Evidence of Chemical Abundance Variations in the Intermediate-age Cluster NGC 1783
de Grijs, Richard; Li, Chengyuan; Wu, Xiaohan +1 more
We have analyzed multi-passband photometric observations, obtained with the Hubble Space Telescope, of the massive (1.8 × 105 M ⊙), intermediate-age (1.8 Gyr-old) Large Magellanic Cloud star cluster NGC 1783. The morphology of the cluster’s red giant branch does not exhibit a clear broadening beyond its intrinsic width; the o…
The Variable Relativistic Outflow of IRAS 13224-3809
Chartas, George; Canas, Manuel H.
The discovery of an ultrafast outflow has been reported in the z = 0.0658 narrow-line Seyfert galaxy IRAS 13224-3809. The ultrafast outflow was first inferred through the detection of highly blueshifted absorption lines and then confirmed with a principal component analysis. Two of the reported properties of this outflow differed from those typica…
The Type IIn Supernova SN 2010bt: The Explosion of a Star in Outburst
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Smith, Nathan +12 more
It is well known that massive stars (M > 8 M ⊙) evolve up to the collapse of the stellar core, resulting in most cases in a supernova (SN) explosion. Their heterogeneity is related mainly to different configurations of the progenitor star at the moment of the explosion and to their immediate environments. We present photometry and sp…
Unraveling the Links among Sympathetic Eruptions
Wang, Yuming; Liu, Rui; Gou, Tingyu +4 more
Solar eruptions occurring at different places within a relatively short time interval are considered to be sympathetic. However, it is difficult to determine whether there exists a cause and effect between them. Here we study a failed and a successful filament eruption following an X1.8-class flare on 2014 December 20, in which slipping-like magne…
The Near-infrared CO Absorption Band as a Probe to the Innermost Part of an AGN-obscuring Material
Nakagawa, Takao; Baba, Shunsuke; Isobe, Naoki +1 more
We performed a systematic analysis of the 4.67 µm CO ro-vibrational absorption band toward nearby active galactic nuclei (AGNs) and analyzed the absorption profiles of 10 nearby galaxies collected from the AKARI and Spitzer spectroscopic observations that show the CO absorption feature by fitting a plane-parallel local thermal equilibrium ga…
Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52
Daddi, E.; Rodighiero, G.; Smolčić, V. +20 more
We report on the discovery of a merger-driven starburst at z = 1.52, PACS-787, based on high signal-to-noise ALMA observations. CO(5-4) and continuum emission (850 µm) at a spatial resolution of 0.″3 reveal two compact (r 1/2 ∼ 1 kpc) and interacting molecular gas disks at a separation of 8.6 kpc, indicative of an early stage in a…
Observation and Modeling of Chromospheric Evaporation in a Coronal Loop Related to Active Region Transient Brightening
Gupta, G. R.; Tripathi, Durgesh; Sarkar, Aveek
Using the observations recorded by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory and the Interface Region Imaging Spectrograph (IRIS) and the Extreme-ultraviolet Imaging Spectrometer and X-Ray Telescope both on board Hinode, we present evidence of chromospheric evaporation in a coronal loop after the occurrence of …
Around the Way: Testing ΛCDM with Milky Way Stellar Stream Constraints
Robertson, Brant E.; Madau, Piero; Dai, Biwei
Recent analyses of the Pal 5 and GD-1 tidal streams suggest that the inner dark matter halo of the Milky Way is close to spherical, in tension with predictions from collisionless N-body simulations of cosmological structure formation. We use the Eris simulation to test whether the combination of dissipative physics and hierarchical structure forma…
Discovery of Tidal RR Lyrae Stars in the Bulge Globular Cluster M62
Minniti, Dante; Marconi, Marcella; Ripepi, Vincenzo +3 more
The RR Lyrae (RRL) rich globular cluster M62 (NGC 6266) is one of the most massive globular clusters in the Milky Way, located in the dense region of the Galactic bulge, where dynamical processes that affect the survival of globular clusters are maximized. Using Gaia second data release data we have found clear evidence for an excess of RRLs beyon…