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Characterizing the Star Formation of the Low-mass Shield Galaxies from Hubble Space Telescope Imaging
Cannon, John M.; Dolphin, Andrew E.; Skillman, Evan D. +8 more
The Survey of Hi in Extremely Low-mass Dwarfs is an on-going multi-wavelength program to characterize the gas, star formation, and evolution in gas-rich, very low-mass galaxies that populate the faint end of the galaxy luminosity function. The galaxies were selected from the first ∼10% of the Hi Arecibo Legacy Fast ALFA survey based on their low H…
NuSTAR Observations of the Powerful Radio Galaxy Cygnus A
Hailey, Charles J.; Fabian, Andrew C.; Reynolds, Christopher S. +17 more
We present NuSTAR observations of the powerful radio galaxy Cygnus A, focusing on the central absorbed active galactic nucleus (AGN). Cygnus A is embedded in a cool-core galaxy cluster, and hence we also examine archival XMM-Newton data to facilitate the decomposition of the spectrum into the AGN and intracluster medium components. NuSTAR gives a …
Supernova-driven outflows in NGC 7552: a comparison of H α and UV tracers
Chisholm, John; Calzetti, Daniela; Leitherer, Claus +3 more
We investigate the supernova-driven galactic wind of the barred spiral galaxy NGC 7552, using both ground-based optical nebular emission lines and far-ultraviolet (UV) absorption lines measured with the Hubble Space Telescope Cosmic Origins Spectrograph. We detect broad (∼300 km s-1) blueshifted (-40 km s-1) optical emission …
Suzaku observations of the galaxy cluster 1RXS J0603.3+4214: Implications of particle acceleration processes in the "Toothbrush" radio relic
Ohashi, Takaya; Takizawa, Motokazu; Akamatsu, Hiroki +4 more
We present the results of Suzaku observations of the galaxy cluster 1RXS J0603.3+4214 with the "Toothbrush" radio relic. Although a shock with Mach number M ≃ 4 is expected at the outer edge of the relic from the radio observation, our temperature measurements of the intracluster medium indicate a weaker temperature difference than expected. The M…
The impact of strong gravitational lensing on observed Lyman-break galaxy numbers at 4 ≤ z ≤ 8 in the GOODS and the XDF blank fields
Treu, T.; Trenti, M.; Illingworth, G. D. +5 more
Detections of Lyman-break galaxies (LBGs) at high-redshift are affected by gravitational lensing induced by foreground deflectors not only in galaxy clusters, but also in blank fields. We quantify the impact of strong magnification in the samples of B435, V606, i775 and z850 & Y105 dropout…
M 101 group galaxies
Tikhonov, N. A.; Galazutdinova, O. A.; Lebedev, V. S.
Based on archival Hubble Space Telescope images, we have performed stellar photometry for the galaxy M 101 and other neighboring galaxies located at a small angular distance from M 101 and having radial velocities similar to that of M 101: M 51, M 63, NGC 5474, NGC 5477, UGC 9405, Ho IV, KUG1413+573, and others. Based on the TRGB method, we have d…
The NuSTAR X-ray spectrum of the low-luminosity active galactic nucleus in NGC 7213
Harrison, F. A.; Stern, D.; Bauer, F. E. +11 more
We present an analysis of the 3-79 keV NuSTAR spectrum of the low-luminosity active galactic nucleus NGC 7213. In agreement with past observations, we find a lower limit to the high-energy cut-off of Ec > 140 keV, no evidence for a Compton-reflected continuum and the presence of an iron K α complex, possibly produced in the broad-lin…
Eta Carinae's 2014.6 spectroscopic event: Clues to the long-term recovery from its Great Eruption
Weis, K.; Davidson, K.; Humphreys, R. M. +9 more
Aims: Every 5.5 years, η Car's light curve and spectrum change remarkably across all observed wavelength bands. These so-called spectroscopic events are most likely caused by the close approach of a companion. We compare the recent spectroscopic event in mid-2014 to the events in 2003 and 2009 and investigate long-term trends.
Methods: E…
Evidence of the Ion Cyclotron Resonance at Proton Kinetic Scales in the Solar Wind
Li, Xing; Roberts, O. W.
The k-filtering and wave polarization techniques are applied to Cluster magnetic field data at four intervals of fast free (not connected to Earth's foreshock) solar wind. In addition to the commonly observed population of magnetic field fluctuations propagating at quasi-perpendicular angles to the global mean field B0 , a population of…
Probing the MSP Prenatal Stage: The Optical Identification of the X-Ray Burster EXO 1745-248 in Terzan 5
Dalessandro, E.; Massari, D.; Mucciarelli, A. +4 more
We report on the optical identification of the neutron star burster EXO 1745-248 in Terzan 5. The identification was performed by exploiting Hubble Space Telescope/Advanced Camera for Surveys images acquired in Director's Discretionary Time shortly after (approximately one month) the Swift detection of the X-ray burst. The comparison between these…