Search Publications
The Herschel Orion Protostar Survey: Luminosity and Envelope Evolution
Manoj, P.; Myers, Philip C.; Fischer, William J. +12 more
The Herschel Orion Protostar Survey obtained well-sampled 1.2-870 µm spectral energy distributions (SEDs) of over 300 protostars in the Orion molecular clouds, home to most of the young stellar objects (YSOs) in the nearest 500 pc. We plot the bolometric luminosities and temperatures for 330 Orion YSOs, 315 of which have bolometric temperatu…
Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
Fontaine, G.; Bergeron, P.; Bédard, A.
We present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the physical parameters derived from the spectroscopic and photometric techniques, and then to test the theoretical mass-radius relation for white dwarfs using these results. …
Magnifying the Early Episodes of Star Formation: Super Star Clusters at Cosmological Distances
Castellano, M.; Pentericci, L.; Vignali, C. +27 more
We study the spectrophotometric properties of a highly magnified (µ ≃ 40{--}70) pair of stellar systems identified at z = 3.2222 behind the Hubble Frontier Field galaxy cluster MACS J0416. Five multiple images (out of six) have been spectroscopically confirmed by means of VLT/MUSE and VLT/X-Shooter observations. Each image includes two faint…
Chromosphere to 1 AU Simulation of the 2011 March 7th Event: A Comprehensive Study of Coronal Mass Ejection Propagation
de Koning, C. A.; Gombosi, T. I.; Tóth, G. +5 more
We perform and analyze the results of a global magnetohydrodynamic simulation of the fast coronal mass ejection (CME) that occurred on 2011 March 7. The simulation is made using the newly developed Alfvén Wave Solar Model (AWSoM), which describes the background solar wind starting from the upper chromosphere and extends to 24 R⊙. Coupli…
The Greater Taurus-Auriga Ecosystem. I. There is a Distributed Older Population
Herczeg, Gregory J.; Rizzuto, Aaron C.; Kraus, Adam L. +5 more
The census of Taurus-Auriga has been assembled over seven decades and inherited the biases and incompleteness of the input studies. The unusual shape of its inferred initial mass function (IMF) and the existence of isolated disk-bearing stars suggest that additional (likely disk-free) members remain to be discovered. We therefore have begun a glob…
Space Telescope and Optical Reverberation Mapping Project.VI. Reverberating Disk Models for NGC 5548
Im, M.; Geier, S.; Zheng, W. +90 more
We conduct a multiwavelength continuum variability study of the Seyfert 1 galaxy NGC 5548 to investigate the temperature structure of its accretion disk. The 19 overlapping continuum light curves (1158 \mathringA to 9157 \mathringA ) combine simultaneous Hubble Space Telescope, Swift, and ground-based observations over a 180 day period from 2014 J…
The PAH Emission Characteristics of the Reflection Nebula NGC 2023
Wolfire, Mark G.; Peeters, Els; Tielens, Alexander G. G. M. +3 more
We present 5-20 µm spectral maps of the reflection nebula NGC 2023 obtained with the Infrared Spectrograph SL and SH modes on board the Spitzer Space Telescope, which reveal emission from polycyclic aromatic hydrocarbons (PAHs), C60, and H2 superposed on a dust continuum. We show that several PAH emission bands correlat…
Detection of Supermassive Black Holes in Two Virgo Ultracompact Dwarf Galaxies
Romanowsky, Aaron J.; Neumayer, Nadine; Strader, Jay +13 more
We present the detection of supermassive black holes (BHs) in two Virgo ultracompact dwarf galaxies (UCDs), VUCD3 and M59cO. We use adaptive optics assisted data from the Gemini/NIFS instrument to derive radial velocity dispersion profiles for both objects. Mass models for the two UCDs are created using multi-band Hubble Space Telescope imaging, i…
A Spatially Resolved Study of Cold Dust, Molecular Gas, H II Regions, and Stars in the z = 2.12 Submillimeter Galaxy ALESS67.1
Ivison, R. J.; Smail, Ian; Brandt, W. N. +17 more
We present detailed studies of a z = 2.12 submillimeter galaxy, ALESS67.1, using sub-arcsecond resolution ALMA, adaptive optics-aided VLT/SINFONI, and Hubble Space Telescope (HST)/CANDELS data to investigate the kinematics and spatial distributions of dust emission (870 µm continuum), 12CO(J = 3-2), strong optical emission lines, …
Effective Radii of Young, Massive Star Clusters in Two LEGUS Galaxies
Cignoni, M.; Gallagher, J. S.; Dale, D. A. +15 more
We present a study of the effective (half-light) radii and other structural properties of a systematically selected sample of young, massive star clusters (≥5 × 103 {M}⊙ and ≤200 Myr) in two nearby spiral galaxies, NGC 628 and NGC 1313. We use Hubble Space Telescope (HST) WFC3/UVIS and archival ACS/WFC data obtained by the L…