Search Publications
Black-hole-Bulge Relationship of Post-starburst Quasars at z ~ 0.3
Canalizo, Gabriela; Brotherton, Michael S.; Cales, Sabrina L. +2 more
The M BH-σ* relation has been studied extensively for local galaxies, but to date there have been scarce few direct measurements of stellar velocity dispersions for systems beyond the local universe. We investigate black hole and host galaxy properties of six "post-starburst quasars" (PSQs) at z ~ 0.3. Spectra of these object…
A Strongly Lensed Massive Ultracompact Quiescent Galaxy at z ~ 2.4 in the COSMOS/UltraVISTA Field
Franx, Marijn; Muzzin, Adam; Labbé, Ivo +14 more
We report the discovery of a massive ultracompact quiescent galaxy that has been strongly lensed into multiple images by a foreground galaxy at z = 0.960. This system was serendipitously discovered as a set of extremely Ks -bright high-redshift galaxies with red J - Ks colors using new data from the UltraVISTA YJHKs
Post-flare Ultraviolet Light Curves Explained with Thermal Instability of Loop Plasma
Orlando, S.; Reale, F.; Landi, E.
In the present work, we study the C8 flare that occurred on 2000 September 26 at 19:49 UT and observed by the Solar and Heliospheric Observatory/Solar Ultraviolet Measurement of Emitted Radiation spectrometer from the beginning of the impulsive phase to well beyond the disappearance in the X-rays. The emission first decayed progressively through e…
The Evolution of Plasma Parameters on a Coronal Source Surface at 2.3 R ⊙ during Solar Minimum
Lamy, P.; Strachan, L.; Kohl, J. L. +1 more
We analyze data from the Solar and Heliospheric Observatory to produce global maps of coronal outflow velocities and densities in the regions where the solar wind is undergoing acceleration. The maps use UV and white light coronal data obtained from the Ultraviolet Coronagraph Spectrometer and the Large Angle Spectroscopic Coronagraph, respectivel…
Hubble Space Telescope FUV Spectra of the Post-common-envelope Hyades Binary V471 Tauri
Bond, Howard E.; Sion, Edward M.; Godon, Patrick +4 more
We have carried out an analysis of the Hubble Space Telescope (HST)/STIS archival spectra of the magnetic white dwarf (WD) in the Hyades eclipsing-spectroscopic, post-common-envelope binary V471 Tauri, time resolved on the orbit and on the X-ray rotational phase of the magnetic WD. An HST/STIS spectrum obtained during primary eclipse reveals a hos…
Two Pseudobulges in the "Boxy Bulge" Galaxy NGC 5746
Kormendy, John; Barentine, John C.
Galaxy formation and growth under the ΛCDM paradigm is expected to proceed in a hierarchical, bottom-up fashion by which small galaxies grow into large galaxies; this mechanism leaves behind large "classical bulges" kinematically distinct from "pseudobulges" grown by internal, secular processes. We use archival data (Spitzer Space Telescope 3.6 &m…
Spatially Resolved Spectroscopy of the Globular Cluster RZ 2109 and the Nature of its Black Hole
Salzer, John J.; Kundu, Arunav; Zepf, Stephen E. +7 more
We present optical Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectroscopy of RZ 2109, a globular cluster (GC) in the elliptical galaxy NGC 4472. This GC is notable for hosting an ultraluminous X-ray source as well as associated strong and broad [O III] λλ4959, 5007 emission. We show that the HST/STIS spectroscopy spati…
Gemini Spectroscopic Survey of Young Star Clusters in Merging/Interacting Galaxies. IV. Stephan's Quintet
Charlton, Jane C.; Konstantopoulos, Iraklis S.; Trancho, Gelys +4 more
We present a spectroscopic survey of 21 young massive clusters and complexes and one tidal dwarf galaxy (TDG) candidate in Stephan's Quintet, an interacting compact group of galaxies. All of the selected targets lie outside the main galaxies of the system and are associated with tidal debris. We find clusters with ages between a few and 125 Myr an…
The Invisible Monster Has Two Faces: Observations of epsilon Aurigae with the Herschel Space Observatory
Stencel, R. E.; Hoard, D. W.; Ladjal, D. +1 more
We present Herschel Space Observatory photometric observations of the unique, long-period eclipsing binary star epsilon Aurigae. Its extended spectral energy distribution is consistent with our previously published cool (550 K) dust disk model. We also present an archival infrared spectral energy distribution of the side of the disk facing the bri…
The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies
Zezas, A.; King, A. R.; Pellegrini, S. +8 more
We report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC 3379, NGC 4278, and NGC 4697. Only one source can be identified with a background counterpart, leaving 17 TCs + PTCs in the galaxies.…