Search Publications
Physical and Chemical Structure of the Disk and Envelope of the Class 0/I Protostar L1527
Flock, Mario; Terebey, Susan; Isella, Andrea +3 more
Submillimeter spectral line and continuum emission from the protoplanetary disks and envelopes of protostars is a powerful probe of their structure, chemistry, and dynamics. Here we present a benchmark study of our modeling code, RadChemT, that for the first time uses a chemical model to reproduce ALMA C18O (2-1), and CARMA 12
Using Chandra Localizations and Gaia Distances and Proper Motions to Classify Hard X-Ray Sources Discovered by INTEGRAL
Hare, Jeremy; Fornasini, Francesca M.; Bodaghee, Arash +7 more
Here, we report on X-ray observations of ten 17-60 keV sources discovered by the International Gamma-Ray Astrophysics Laboratory satellite. The primary new information is sub-arcsecond positions obtained by the Chandra X-ray Observatory. In six cases (IGR J17040-4305, IGR J18017-3542, IGR J18112-2641, IGR J18434-0508, IGR J19504+3318, and IGR J200…
On the Collisional Disalignment of Dust Grains in Illuminated and Shaded Regions of IC 63
Soam, Archana; Andersson, B. -G.; Acosta-Pulido, Jose +5 more
Interstellar dust grain alignment causes polarization from UV to mm wavelengths, allowing the study of the geometry and strength of the magnetic field. Over the last couple of decades, observations and theory have led to the establishment of the radiative alignment torque mechanism as a leading candidate to explain the effect. With a quantitativel…
NOEMA Observations of CO Emission in Arp 142 and Arp 238
Xu, C. K.; Lisenfeld, U.; Gao, Y. +1 more
Previous studies have shown significant differences in the enhancement of the star formation rate (SFR) and star formation efficiency (SFE = SFR/Mmol) between spiral-spiral and spiral-elliptical mergers. In order to shed light on the physical mechanism of these differences, we present NOEMA observations of the molecular gas distribution…
Modeling the Unresolved NIR-MIR SEDs of Local (z < 0.1) QSOs
Geier, S.; Aretxaga, I.; González-Martín, O. +8 more
To study the nuclear (≲1 kpc) dust of nearby (z < 0.1) quasi-stellar objects (QSOs), we obtained new near-infrared (NIR) high angular resolution (~0.″3) photometry in the H and Ks bands for 13 QSOs with available mid-infrared (MIR) high angular resolution spectroscopy (~7.5-13.5 µm). We find that in most QSOs, the NIR emission is unresolv…
Spectroscopically Identified Emission Line Galaxy Pairs in the WISP Survey
Hathi, Nimish P.; Teplitz, Harry I.; Bunker, Andrew J. +20 more
We identify a sample of spectroscopically measured emission line galaxy (ELG) Pairs up to z = 1.6 from the Wide Field Camera 3 (WFC3) Infrared Spectroscopic Parallels (WISP) survey. WISP obtained slitless, near-infrared grism spectroscopy along with direct imaging in the J and H bands by observing in the pure-parallel mode with the WFC3 on board t…
Do Current X-Ray Observations Capture Most of the Black-hole Accretion at High Redshifts?
Papovich, Casey; Yang, Guang; Estrada-Carpenter, Vicente +4 more
The cosmic black hole accretion density (BHAD) is critical for our understanding of the formation and evolution of supermassive black holes (BHs). However, at high redshifts (z > 3), X-ray observations report BHADs significantly (~10 times) lower than those predicted by cosmological simulations. It is therefore paramount to constrain the high-z…
The 3.3 µm Infrared Emission Feature: Observational and Laboratory Constraints on Its Carrier
Tokunaga, Alan T.; Bernstein, Lawrence S.
We examine the self-consistency of laboratory and observational data for potential carriers of the 3.3 µm infrared emission feature (IEF), a member of the ubiquitous family of strong interstellar IEFs at 3.3, 3.4, 6.2, 7.7, 8.6, 11.2, and 12.7 µm. Previous studies have shown that most Galactic sources (reflection nebulae, H II regions,…
NGC 147 Corroborates the Break in the Stellar Mass-Stellar Metallicity Relation for Galaxies
Leethochawalit, Nicha; Kirby, Evan N.; Zhuang, Zhuyun +1 more
The stellar mass-stellar metallicity relation (MZR) is an essential approach to probing the chemical evolution of galaxies. It reflects the balance between galactic feedback and gravitational potential as a function of stellar mass. However, the current MZR of local dwarf satellite galaxies (M* ≲ 108 M⊙; measured f…
Prediction of Soft Proton Intensities in the Near-Earth Space Using Machine Learning
Tiengo, Andrea; Allen, Robert C.; Gastaldello, Fabio +14 more
The spatial distribution of energetic protons contributes to the understanding of magnetospheric dynamics. Based upon 17 yr of the Cluster/RAPID observations, we have derived machine-learning-based models to predict the proton intensities at energies from 28 to 962 keV in the 3D terrestrial magnetosphere at radial distances between 6 and 22 R…