Search Publications
Spectrophotometric Redshifts in the Faint Infrared Grism Survey: Finding Overdensities of Faint Galaxies
Gardner, Jonathan P.; Hathi, Nimish; Windhorst, Rogier +19 more
We improve the accuracy of photometric redshifts by including low-resolution spectral data from the G102 grism on the Hubble Space Telescope (HST), which assists in redshift determination by further constraining the shape of the broadband spectral energy distribution (SED) and identifying spectral features. The photometry used in the redshift fits…
Discovery of a 3 s Spinning Neutron Star in a 4.15 hr Orbit in the Brightest Hard X-Ray Source in M31
Esposito, Paolo; Tiengo, Andrea; Israel, Gian Luca +5 more
We report the discovery with XMM-Newton of 3 s X-ray pulsations from 3XMM J004232.1+411314, a dipping source that dominates the hard X-ray emission of M31. This finding unambiguously assesses the neutron star (NS) nature of the compact object. We also measured an orbital period of 4.15 hr and a projected semi-axis at aX sin i = 0.6 lt-s…
The Spitzer-IRAC/MIPS Extragalactic Survey (SIMES). II. Enhanced Nuclear Accretion Rate in Galaxy Groups at z ∼ 0.2
Berta, S.; Rodighiero, G.; Ciesla, L. +22 more
For a sample of star-forming galaxies in the redshift interval 0.15 < z < 0.3, we study how both the relative strength of the active galactic nucleus (AGN) infrared emission, compared to that due to the star formation (SF), and the numerical fraction of AGNs change as a function of the total stellar mass of the hosting galaxy group ({M}…
Solar Cycle Observations of the Neon Abundance in the Sun-as-a-star
Warren, Harry P.; Brooks, David H.; Baker, Deborah +1 more
Properties of the Sun’s interior can be determined accurately from helioseismological measurements of solar oscillations. These measurements, however, are in conflict with photospheric elemental abundances derived using 3D hydrodynamic models of the solar atmosphere. This divergence of theory and helioseismology is known as the “solar modeling pro…
Widespread Shocks in the Nucleus of NGC 404 Revealed by Near-infrared Integral Field Spectroscopy
Armus, L.; Boehle, A.; Larkin, J. E. +1 more
We present high spatial resolution, integral field spectrograph (IFS) observations of the nearby low-ionization nuclear emission-line region (LINER) galaxy NGC 404 at 1.25 µm (J band) and 2.2 µm (K band) near-infrared (NIR) wavelengths. Although NGC 404 is thought to host an intermediate-mass black hole (BH) at its center, it has been …
The Connection between Different Tracers of the Diffuse Interstellar Medium: Kinematics
Lambert, D. L.; Federman, S. R.; Goldsmith, Paul F. +4 more
Using visible, radio, microwave, and submillimeter data, we study several lines of sight toward stars generally closer than 1 kpc on a component-by-component basis. We derive the component structure seen in absorption at visible wavelengths from Ca II, Ca I, K I, CH, CH+, and CN and compare it to emission from H I, CO and its isotopolog…
Revealing Dusty Supernovae in High-redshift (Ultra)Luminous Infrared Galaxies through Near-infrared Integrated Light Variability
Yan, Haojing; Ma, Zhiyuan; Beacom, John F. +1 more
Luminous and ultra-luminous infrared galaxies ((U)LIRGs) are rare today but are increasingly abundant at high redshifts. They are believed to be dusty starbursts, and hence should have high rates of supernovae (multiple events per year). Due to their extremely dusty environment, however, such supernovae could only be detected in rest-frame infrare…
Solar Radio Burst Associated with the Falling Bright EUV Blob
Dudík, Jaroslav; Zemanová, Alena; Karlický, Marian +1 more
At the beginning of the 2015 November 4 flare, in the 1300-2000 MHz frequency range, we observed a very rare slow positively drifting burst. We searched for associated phenomena in simultaneous EUV observations made by IRIS, SDO/AIA, and Hinode/XRT, as well as in H α observations. We found that this radio burst was accompanied with the…
Laboratory Analog of Heavy Jets Impacting a Denser Medium in Herbig-Haro (HH) Objects
Wang, C.; Zhang, J.; Zhao, G. +17 more
X-ray emissions in protostars play an important role in the chemistry of protostellar disks and in constraining the physics of jet formation. We have experimentally investigated the mechanism of X-ray emission in protostellar jets and modeled their interaction with the surrounding medium. The simulated supersonic jet is generated by intense laser …
Chandra and HST Snapshots of Fossil System Progenitors
White, Raymond E., III; Dupke, Renato A.; Wong, Ka-Wah +2 more
The search for the progenitors to today’s fossil galaxy systems has been restricted to N-body simulations until recently, when 12 fossil progenitors were identified in the CASSOWARY catalog of strong-lensing systems. All 12 systems lie in the predicted redshift range for finding fossils that are in the process of assembling their brightest group g…