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Determining the Halo Mass Scale Where Galaxies Lose Their Gas
Moustakas, John; Aragón-Salamanca, Alfonso; Milvang-Jensen, Bo +9 more
A major question in galaxy formation is how the gas supply that fuels activity in galaxies is modulated by their environment. We use spectroscopy of a set of well-characterized clusters and groups at 0.4 < z < 0.8 from the ESO Distant Cluster Survey and compare it to identically selected field galaxies. Our spectroscopy allows us to isolate …
Blind Millimeter Line Emitter Search using ALMA Data Toward Gravitational Lensing Clusters
Tamura, Yoichi; Kohno, Kotaro; Oguri, Masamune +10 more
We present the results of a blind millimeter line emitter search using ALMA Band 6 data with a single-frequency tuning toward four gravitational lensing clusters (RXJ1347.5-1145, Abell S0592, MACS J0416.1-2403, and Abell 2744). We construct 3D signal-to-noise ratio (S/N) cubes with 60 and 100 MHz binning, and search for millimeter line emitters. W…
Gas Content and Kinematics in Clumpy, Turbulent Star-forming Disks
Glazebrook, Karl; Bolatto, Alberto D.; Obreschkow, Danail +6 more
We present molecular gas-mass estimates for a sample of 13 local galaxies whose kinematic and star-forming properties closely resemble those observed in z ≈ 1.5 main-sequence galaxies. Plateau de Bure observations of the CO[1-0] emission line and Herschel Space Observatory observations of the dust emission both suggest molecular gas-mass fractions…
Normal and counter Evershed flows in the photospheric penumbra of a sunspot. SPINOR 2D inversions of Hinode-SOT/SP observations
Solanki, S. K.; Lagg, A.; Jurčák, J. +2 more
Context. The Evershed effect, a nearly horizontal outflow of material seen in the penumbrae of sunspots in the photospheric layers, is a common characteristic of well-developed penumbrae, but is still not well understood. Even less is known about photospheric horizontal inflows in the penumbra, also known as counter Evershed flows.
Aims: Here…
The nearby interstellar medium toward α Leo. UV observations and modeling of a warm cloud within hot gas
Jenkins, Edward B.; Gry, Cecile
Aims: Our aim is to characterize the conditions in the nearest interstellar cloud.
Methods: We analyze interstellar absorption features in the full UV spectrum of the nearby (d = 24 pc) B8 IVn star
Chemical abundances of two extragalactic young massive clusters
Hernandez, Svea; Kaper, Lex; Larsen, Søren +2 more
Aims: We use integrated-light spectroscopic observations to measure metallicities and chemical abundances for two extragalactic young massive star clusters (NGC 1313-379 and NGC 1705-1). The spectra were obtained with the X-shooter spectrograph on the ESO Very Large Telescope.
Methods: We compute synthetic integrated-light spectra, based…
Calibration of the photometric G passband for Gaia Data Release 1
Maíz Apellániz, J.
Context. On September 2016 the first data from Gaia were released (DR1). The first release included photometry for over 109 sources in the very broad G system.
Aims: The aims here are to test the correspondence between G magnitudes in DR1 and the synthetic equivalents derived using spectral energy distributions from observed and mo…
Extended Gamma-Ray Emission from the G25.0+0.0 Region: A Star-forming Region Powered by the Newly Found OB Association?
Funk, S.; Uchiyama, Y.; Katsuta, J.
We report a study of extended γ-ray emission with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope, which is likely to be the second case of a γ-ray detection from a star-forming region (SFR) in our Galaxy. The LAT source is located in the G25 region, 1.°7 × 2.°1 around (l, b) = (25.°0, 0.°0). The γ-ray emission is found…
Inflowing gas onto a compact obscured nucleus in Arp 299A. Herschel spectroscopic studies of H2O and OH
González-Alfonso, E.; Aalto, S.; Fischer, J. +1 more
Aims: We probe the physical conditions in the core of Arp 299A and try to put constraints on the nature of its nuclear power source.
Methods: We used Herschel Space Observatory far-infrared and submillimeter observations of H2O and OH rotational lines in Arp 299A to create a multi-component model of the galaxy. In doing this, …
Young LMC clusters: the role of red supergiants and multiple stellar populations in their integrated light and CMDs
Beasley, Michael A.; Vazdekis, Alexandre; Cerviño, Miguel +3 more
The optical integrated spectra of three Large Magellanic Cloud young stellar clusters (NGC 1984, NGC 1994 and NGC 2011) exhibit concave continua and prominent molecular bands which deviate significantly from the predictions of single stellar population (SSP) models. In order to understand the appearance of these spectra, we create a set of young s…