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Temperature structure and kinematics of the IRDC G035.39-00.33
Caselli, Paola; Henshaw, Jonathan D.; Wang, Ke +6 more
Aims: Infrared dark clouds represent the earliest stages of high-mass star formation. Detailed observations of their physical conditions on all physical scales are required to improve our understanding of their role in fueling star formation.
Methods: We investigate the large-scale structure of the IRDC G035.39-00.33, probing the dense g…
The spatially resolved star formation history of mergers. A comparative study of the LIRGs IC 1623, NGC 6090, NGC 2623, and Mice
González Delgado, R. M.; Di Matteo, P.; Sánchez, S. F. +8 more
This paper presents the spatially resolved star formation history (2D-SFH) of a small sample of four local mergers: the early-stage mergers IC 1623, NGC 6090, and the Mice, and the more advanced merger NGC 2623, by analyzing IFS data from the CALIFA survey and PMAS in LArr mode. Full spectral fitting techniques are applied to the datacubes to obta…
Searching for Interstellar {{\rm{C}}}_{60}^{+} Using a New Method for High Signal-to-noise HST/STIS Spectroscopy
Gull, T. R.; Lallement, R.; Najarro, F. +9 more
Due to recent advances in laboratory spectroscopy, the first optical detection of a very large molecule has been claimed in the diffuse interstellar medium (ISM): {{{C}}}60+ (ionized Buckminsterfullerene). Confirming the presence of this molecule would have significant implications regarding the carbon budget and chemical com…
Electrostatic Potential Radiated by a Pulsating Charge in a Two-Electron Temperature Plasma
Henri, P.; Wattieaux, G.; Béghin, C. +2 more
Mutual impedance experiments have been developed to constrain the plasma bulk properties, such as density and temperature, of ionospheric and later space plasmas, through the electric coupling between an emitter and a receiver electric antennas. So far, the analytical modeling of such instruments has enabled to treat ionospheric plasmas, where cha…
Asteroseismic masses of retired planet-hosting A-stars using SONG
Huber, Daniel; Bedding, Timothy R.; Stello, Dennis +9 more
To better understand how planets form, it is important to study planet occurrence rates as a function of stellar mass. However, estimating masses of field stars is often difficult. Over the past decade, a controversy has arisen about the inferred occurrence rate of gas-giant planets around evolved intermediate-mass stars - the so-called 'retired A…
Current and Future Constraints on Primordial Magnetic Fields
Feng, Chang; Reichardt, Christian L.; Sutton, Dylan R.
We present new limits on the amplitude of potential primordial magnetic fields (PMFs) using temperature and polarization measurements of the cosmic microwave background (CMB) from Planck, the BICEP2/Keck Array, Polarbear, and SPTpol. We reduce twofold the 95% confidence upper limit on the CMB anisotropy power due to a nearly scale-invariant PMF, w…
The ESA Gaia Archive: Data Release 1
González-Núñez, J.; Gutiérrez-Sánchez, R.; Segovia, J. C. +4 more
The ESA Gaia mission is producing the most accurate source catalogue in astronomy to date. This represents a challenge in archiving to make the information and data accessible to astronomers in an efficient way, due to the size and complexity of the data. Also, new astronomical missions, taking larger and larger volumes of data, are reinforcing th…
Spectroscopic Observations of Magnetic Reconnection and Chromospheric Evaporation in an X-shaped Solar Flare
Gan, W. Q.; Ding, M. D.; Li, Y. +3 more
We present observations of distinct UV spectral properties at different locations during an atypical X-shaped flare (SOL2014-11-09T15:32) observed by the Interface Region Imaging Spectrograph (IRIS). In this flare, four chromospheric ribbons appear and converge at an X-point where a separator is anchored. Above the X-point, two sets of non-coplana…
The Origins of UV-optical Color Gradients in Star-forming Galaxies at z ∼ 2: Predominant Dust Gradients but Negligible sSFR Gradients
Barro, Guillermo; Faber, S. M.; Tacchella, Sandro +13 more
The rest-frame UV-optical (I.e., NUV - B) color is sensitive to both low-level recent star formation (specific star formation rate—sSFR) and dust. In this Letter, we extend our previous work on the origins of NUV - B color gradients in star-forming galaxies (SFGs) at z∼ 1 to those at z∼ 2. We use a sample of 1335 large (semimajor axis radius {R}
Young Galaxy Candidates in the Hubble Frontier Fields. IV. MACS J1149.5+2223
Broadhurst, Tom; Moustakas, John; Zheng, Wei +11 more
We search for high-redshift dropout galaxies behind the Hubble Frontier Fields (HFF) galaxy cluster MACS J1149.5+2223, a powerful cosmic lens that has revealed a number of unique objects in its field. Using the deep images from the Hubble and Spitzer space telescopes, we find 11 galaxies at z > 7 in the MACS J1149.5+2223 cluster field, and 11 i…