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The Search for Molecular Outflows in Local Volume AGNs with Herschel-PACS
Sturm, E.; Veilleux, S.; González-Alfonso, E. +3 more
We present the results from a systematic search for galactic-scale, molecular (OH 119 µm) outflows in a sample of 52 Local Volume (d\lt 50 Mpc) Burst Alert Telescope detected active galactic nuclei (BAT AGNs) with Herschel-PACS. We combine the results from our analysis of the BAT AGNs with the published Herschel/PACS data of 43 nearby (z\lt …
Cloud Structure of Galactic OB Cluster-forming Regions from Combining Ground- and Space-based Bolometric Observations
Li, Di; Qian, Lei; Rosolowsky, Erik +13 more
We have developed an iterative procedure to systematically combine the millimeter and submillimeter images of OB cluster-forming molecular clouds, which were taken by ground-based (CSO, JCMT, APEX, and IRAM-30 m) and space telescopes (Herschel and Planck). For the seven luminous (L\gt {10}6 L ⊙) Galactic OB cluster-forming mo…
Further ALMA observations and detailed modeling of the Red Rectangle
Sánchez Contreras, C.; Alcolea, J.; Santander-García, M. +3 more
Aims: We aim to study the rotating and expanding gas in the Red Rectangle, which is a well known bipolar nebula surrounding a double stellar system whose primary is a post-asymptotic giant branch (post-AGB) star. We analyze the properties of both components and the relation between them. Rotating disks have been very elusive in post-AGB nebul…
Composition, seasonal change, and bathymetry of Ligeia Mare, Titan, derived from its microwave thermal emission
Lorenz, R. D.; Karatekin, O.; Janssen, M. A. +8 more
For the last decade, the passive radiometer incorporated in the Cassini RADAR has recorded the 2.2 cm wavelength thermal emission from Titan's seas. In this paper, we analyze the radiometry observations collected from February 2007 to January 2015 over one of these seas, Ligeia Mare, with the goal of providing constraints on its composition, bathy…
A study of the circumgalactic medium at z ∼ 0.6 using damped Lyman α galaxies
Turnshek, David A.; Rao, Sandhya M.; Kulkarni, Varsha P. +6 more
We present the study of a sample of nine quasi-stellar object fields, with damped Lyman α (DLA) or sub-DLA systems at z ∼ 0.6, observed with the X-Shooter spectrograph at the Very Large Telescope. By suitably positioning the X-Shooter slit based on high spatial resolution images of Hubble Space Telescope/Advanced Camera for Surveys we are able to …
Acceleration of the universe: a reconstruction of the effective equation of state
Mukherjee, Ankan
This work is based upon a parametric reconstruction of the effective or total equation of state in a model for the Universe with accelerated expansion. The constraints on the model parameters are obtained by maximum-likelihood analysis using the supernova distance modulus data, observational Hubble data, baryon acoustic oscillation data and cosmic…
Impacts of spontaneous hot flow anomalies on the magnetosheath and magnetopause
Berchem, J.; Zhang, H.; Omidi, N. +1 more
Spacecraft observations and global hybrid (kinetic ions and fluid electrons) simulations have demonstrated that ion dissipation processes at the quasi-parallel bow shock are associated with the formation of structures called spontaneous hot flow anomalies (SHFAs). Previous simulations and recent spacecraft observations have also established that S…
Caught in the Act: Gas and Stellar Velocity Dispersions in a Fast Quenching Compact Star-Forming Galaxy at z~1.7
Finkelstein, Steven L.; Barro, Guillermo; Pérez-González, Pablo G. +20 more
We present Keck I MOSFIRE spectroscopy in the Y and H bands of GDN-8231, a massive, compact, star-forming galaxy at a redshift of z ∼ 1.7. Its spectrum reveals both Hα and [N II] emission lines and strong Balmer absorption lines. The Hα and Spitzer MIPS 24 µm fluxes are both weak, thus indicating a low star-formation rate of SFR ≲ 5{--}10 {M…
AGN feedback in the nucleus of M 51
Meidt, S. E.; Schinnerer, E.; Leroy, A. K. +10 more
AGN feedback is invoked as one of the most relevant mechanisms that shape the evolution of galaxies. Our goal is to understand the interplay between AGN feedback and the interstellar medium in M 51, a nearby spiral galaxy with a modest AGN and a kpc-scale radio jet expanding through the disc of the galaxy. For this purpose, we combine molecular ga…
Search for 511 keV emission in satellite galaxies of the Milky Way with INTEGRAL/SPI
Vincent, Aaron C.; Diehl, Roland; Siegert, Thomas +3 more
Context. The positron (e+) annihilation γ-ray signal in the Milky Way (MW) shows a puzzling morphology: a very bright bulge and a very low surface-brightness disk. A coherent explanation of the e+ origin, propagation through the Galaxy and subsequent annihilation in the interstellar medium has not yet been found. Tentative ex…