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Comet 322P/SOHO 1: An Asteroid with the Smallest Perihelion Distance?
Snodgrass, Colin; Knight, Matthew M.; Kelley, Michael S. P. +1 more
We observed comet 322P/SOHO 1 (P/1999 R1) from the ground and with the Spitzer Space Telescope when it was between 2.2 and 1.2 au from the Sun. These are the first observations of any Solar and Heliospheric Observatory (SOHO)-discovered periodic comet by a non-solar observatory and allow us to investigate its behavior under typical cometary circum…
Starburst galaxies in the COSMOS field: clumpy star-formation at redshift 0 < z < 0.5
Muñoz-Tuñón, C.; Méndez-Abreu, J.; Hinojosa-Goñi, R.
Context. At high redshift, starburst galaxies present irregular morphologies with 10-20% of their star formation occurring in giant clumps. These clumpy galaxies are considered the progenitors of local disk galaxies. To understand the properties of starbursts at intermediate and low redshift, it is fundamental to track their evolution and the poss…
Quasar host environments: The view from Planck
Palanque-Delabrouille, Nathalie; Yèche, Christophe; Magneville, Christophe +3 more
We measure the far-infrared emission of the general quasar (QSO) population using Planck observations of the Baryon Oscillation Spectroscopic Survey QSO sample. By applying multi-component matched multi-filters to the seven highest Planck frequencies, we extract the amplitudes of dust, synchrotron, and thermal Sunyaev-Zeldovich (SZ) signals for ne…
Dense Gas in Molecular Cores Associated with Planck Galactic Cold Clumps
Liu, Hong-Li; Liu, Tie; Yuan, Jinghua +7 more
We present the first survey of dense gas toward Planck Galactic Cold Clumps (PGCCs). Observations in the J = 1-0 transitions of HCO+ and HCN toward 621 molecular cores associated with PGCCs were performed using the Purple Mountain Observatory’s 13.7 m telescope. Among them, 250 sources were detected, including 230 cores detected in HCO<…
HST Imaging of the Local Volume Dwarf Galaxies Pisces A and B: Prototypes for Local Group Dwarfs
Dolphin, Andrew E.; Weisz, Daniel R.; Putman, Mary E. +3 more
We present observations of the Pisces A and B galaxies with the Advanced Camera for Surveys on the Hubble Space Telescope. Photometry from these images clearly resolves a red giant branch (RGB) for both objects, demonstrating that they are nearby dwarf galaxies. We describe a Bayesian inferential approach to determining the distance to these galax…
Mapping Seyfert and LINER Excitation Modes in the Inner kpc of NGC 3393
Elvis, Martin; Raymond, John; Storchi-Bergmann, Thaisa +5 more
We mapped the extended narrowline region (ENLR) of NGC 3393 on scales of r≲ 4\prime\prime (∼ 1 kpc) from the nucleus using emission line images of Hα λ6563, [O III]λ 5007, and [S II]λ λ 6717,6731, taken with the Hubble Space Telescope as part of the CHandra survey of Extended Emission line Regions in nearby Seyfert galaxies (CHEERS). By…
A statistical study on the shape and position of the magnetotail neutral sheet
Zhang, Tielong; Nakamura, Rumi; Ge, Yasong +3 more
We study the average shape and position of the magnetotail neutral sheet based on magnetic field data obtained by Cluster, Geotail, TC-1, and THEMIS from the years 1995 to 2013. All data in the aberrated GSM (geocentric solar magnetospheric) coordinate system are normalized to the same solar wind pressure 2 nPa and downtail distance X ∼ -20RE…
Parallax of a Mira variable R Ursae Majoris studied with astrometric VLBI
Kurayama, Tomoharu; Honma, Mareki; Nakagawa, Akiharu +5 more
We have measured an annual parallax of the Mira variable R Ursae Majoris (R UMa) with the VLBI Exploration for Radio Astronomy (VERA). From the monitoring VLBI observations over a span of about two years, we detected H2O maser spots in the LSR velocity range from 37 to 42 km s-1. We derived an annual parallax of 1.97 ± 0.05 m…
Themis Regio, Venus: Evidence for recent (?) volcanism from VIRTIS data
Helbert, Joern; Stofan, Ellen R.; Smrekar, Suzanne E. +1 more
Themis Regio is interpreted to be a hotspot rise underlain by one or more mantle plumes. Many volcanic features in the Themis region have high emissivity anomalies in Venus Express Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) data. Other high emissivity anomalies have been found to correspond to volcanic flows interpreted to be relat…
ALMA Imaging of the CO (6-5) Line Emission in NGC 7130*
Inami, Hanae; Murphy, Eric; van der Werf, Paul +11 more
In this paper, we report our high-resolution (0.″20 × 0.″14 or ∼70 × 49 pc) observations of the CO(6-5) line emission, which probes warm and dense molecular gas, and the 434 µm dust continuum in the nuclear region of NGC 7130, obtained with the Atacama Large Millimeter Array (ALMA). The CO line and dust continuum fluxes detected in our ALMA …