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How the power spectrum of dust continuum images may hide the presence of a characteristic filament width
Miville-Deschênes, M. -A.; André, Ph.; Arzoumanian, D. +6 more
Context. Herschel observations of interstellar clouds support a paradigm for star formation in which molecular filaments play a central role. One of the foundations of this paradigm is the finding, based on detailed studies of the transverse column density profiles observed with Herschel, that nearby molecular filaments share a common inner width …
Signatures of Tidal Disruption in Ultra-faint Dwarf Galaxies: A Combined HST, Gaia, and MMT/Hectochelle Study of Leo V
Caldwell, Nelson; Strader, Jay; Seth, Anil C. +10 more
The ultra-faint dwarf galaxy Leo V has shown both photometric overdensities and kinematic members at large radii, along with a tentative kinematic gradient, suggesting that it may have undergone a close encounter with the Milky Way. We investigate these signs of disruption through a combination of (i) high precision photometry obtained with the Hu…
Nuclear kinematics in nearby AGN - I. An ALMA perspective on the morphology and kinematics of the molecular CO(2-1) emission
Storchi-Bergmann, T.; Schnorr-Müller, A.; Robinson, A. +6 more
We present the molecular gas morphology and kinematics of seven nearby Seyfert galaxies obtained from our 230 GHz ALMA observations. The CO J = 2-1 kinematics within the inner ∼30 arcsec (≲9 kpc) reveals rotation patterns that have been explored using the Bertola rotation model and a modified version of the Kinemetry package. The latter algorithm …
Resolved Molecular Gas and Star Formation Properties of the Strongly Lensed z = 2.26 Galaxy SDSS J0901+1814
Wilner, David J.; Keeton, Charles R.; Lutz, Dieter +8 more
We present ∼1″ resolution (∼2 kpc in the source plane) observations of the CO (1-0), CO (3-2), Hα, and [N II] lines in the strongly lensed z = 2.26 star-forming galaxy SDSS J0901+1814. We use these observations to constrain the lensing potential of a foreground group of galaxies, and our source-plane reconstructions indicate that SDSS J0901+1814 i…
Identifying Galactic Halo Substructure in 6D Phase Space Using ∼13,000 LAMOST K Giants
Tian, Hao; Zhao, Gang; Li, Chengdong +6 more
We construct a large halo K-giant sample by combining the positions, distances, radial velocities, and metallicities of over 13,000 LAMOST DR5 halo K giants with the Gaia DR2 proper motions, which covers a Galactocentric distance range of 5-120 kpc. Using a position-velocity clustering estimator (the 6Distance), we statistically quantify the prese…
X-ray reverberation lags of the Fe-K line due to AGN disc winds
Done, Chris; Tsujimoto, Masahiro; Ebisawa, Ken +3 more
Short X-ray reverberation lags are seen across a broad Fe-K energy band in more than 20 active galactic nuclei (AGNs). This broad iron line feature in the lag spectrum is most significant in super-Eddington sources such as Ark 564 (L/LEdd ∼ 1) and 1H 0707-495 (L/LEdd ≳ 10). The observed lag time-scales correspond to very shor…
The long outburst of the black hole transient GRS 1716-249 observed in the X-ray and radio band
Motta, S. E.; Segreto, A.; Malzac, J. +9 more
We present the spectral and timing analysis of X-ray observations performed on the Galactic black hole transient GRS 1716-249 during the 2016-2017 outburst. The source was almost continuously observed with the Neil Gehrels Swift Observatory from 2016 December until 2017 October. The X-ray hardness ratio and timing evolution indicate that the sourc…
Coordinates and Maps of the Apollo 17 Landing Site
Oberst, Jürgen; Haase, Isabel; Wählisch, Marita +2 more
We carried out an extensive cartographic analysis of the Apollo 17 landing site and determined and mapped positions of the astronauts, their equipment, and lunar landmarks with accuracies of better than ±1 m in most cases. To determine coordinates in a lunar body-fixed coordinate frame, we applied least squares (2-D) network adjustments to angular…
Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
Henning, Thomas; Nakagawa, Takao; Currie, Thayne +24 more
We present SCExAO/CHARIS 1.1-2.4 µm integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consisting of an A0V primary with two low-mass companions at a projected separation of < 1″. Thanks to the high quality wavefront corrections provided by SCExAO, both com…
Two Jovian Planets around the Giant Star HD 202696: A Growing Population of Packed Massive Planetary Pairs around Massive Stars?
Trifonov, Trifon; Stock, Stephan; Henning, Thomas +6 more
We present evidence for a new two-planet system around the giant star HD 202696 (=HIP 105056, BD +26 4118). The discovery is based on public HIRES radial velocity (RV) measurements taken at Keck Observatory between 2007 July and 2014 September. We estimate a stellar mass of {1.91}-0.14+0.09{M}⊙ for HD 202696, whic…