Search Publications
Early Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster
Giavalisco, Mauro; Kirkpatrick, Allison; Zavala, Jorge A. +32 more
We directly detect dust emission in an optically detected, multiply imaged galaxy lensed by the Frontier Fields cluster MACSJ0717.5+3745. We detect two images of the same galaxy at 1.1 mm with the AzTEC camera on the Large Millimeter Telescope leaving no ambiguity in the counterpart identification. This galaxy, MACS0717_Az9, is at z > 4 and the…
Impact of basic angle variations on the parallax zero point for a scanning astrometric satellite
van Leeuwen, Floor; Lindegren, Lennart; Hobbs, David +2 more
Context. Determination of absolute parallaxes by means of a scanning astrometric satellite such as Hipparcos or Gaia relies on the short-term stability of the so-called basic angle between the two viewing directions. Uncalibrated variations of the basic angle may produce systematic errors in the computed parallaxes.
Aims: We examine the coupl…
New Low-mass Stars in the 25 Orionis Stellar Group and Orion OB1a Sub-association from SDSS-III/BOSS Spectroscopy
Stassun, Keivan G.; Petr-Gotzens, Monika G.; Suárez, Genaro +6 more
The Orion OB1a sub-association is a rich low-mass star (LMS) region. Previous spectroscopic studies have confirmed 160 LMSs in the 25 Orionis stellar group (25 Ori), which is the most prominent overdensity of Orion OB1a. Nonetheless, the current census of the 25 Ori members is estimated to be lower than 50% complete, leaving a large number of memb…
The Origin of [C II] 157 µm Emission in a Five-component Interstellar Medium: The Case of NGC 3184 and NGC 628
Armus, L.; Hunt, L. K.; Smith, J. D. +13 more
With its relatively low ionization potential, C+ can be found throughout the interstellar medium (ISM) and provides one of the main cooling channels of the ISM via the [C II] 157 µm emission. While the strength of the [C II] line correlates with the star formation rate, the contributions of the various gas phases to the [C II] emi…
On the relation between the mass of Compact Massive Objects and their host galaxies
Capuzzo-Dolcetta, R.; Tosta e Melo, I.
Supermassive black holes and/or very dense stellar clusters are found in the central regions of galaxies. Nuclear star clusters (NSCs) are present mainly in faint galaxies, while supermassive black holes are common in galaxies with masses ≥1010 M⊙. In the intermediate galactic mass range, both types of compact massive objects…
The Causes of Quasi-homologous CMEs
Temmer, M.; Veronig, A. M.; Wang, Yuming +8 more
In this paper, we identified the magnetic source locations of 142 quasi-homologous (QH) coronal mass ejections (CMEs), of which 121 are from solar cycle (SC) 23 and 21 from SC 24. Among those CMEs, 63% originated from the same source location as their predecessor (defined as S-type), while 37% originated from a different location within the same a…
A Spectroscopic Study of the Rich Supernova Remnant Population in M83
Blair, William P.; Long, Knox S.; Winkler, P. Frank
We report the results from a spectrophotometric study sampling the ≳ 300 candidate supernova remnants (SNRs) in M83 identified through optical imaging with Magellan/IMACS and Hubble Space Telescope/WFC3. Of the 118 candidates identified based on a high [S II] λλ 6716, 6731 to Hα emission ratio, 117 show spectroscopic signatures of shock-heated gas…
Dynamics of Subarcsecond Bright Dots in the Transition Region above Sunspots and Their Relation to Penumbral Micro-jets
Tian, Hui; Banerjee, Dipankar; Samanta, Tanmoy +1 more
Recent high-resolution observations have revealed that subarcsecond bright dots (BDs) with sub-minute lifetimes appear ubiquitously in the transition region (TR) above sunspot penumbra. The presence of penumbral micro-jets (PMJs) in the chromosphere was previously reported. It was proposed that both the PMJs and BDs are formed due to a magnetic re…
An Optical and Infrared Photometric Study of the Young Open Cluster IC 1805 in the Giant H II Region W4 †
Lim, Beomdu; Park, Byeong-Gon; Nazé, Y. +7 more
We present deep wide-field optical CCD photometry and mid-infrared Spitzer/IRAC and MIPS 24 µm data for about 100,000 stars in the young open cluster IC 1805. The members of IC 1805 were selected from their location in the various color-color and color-magnitude diagrams, and the presence of Hα emission, mid-infrared excess emission, and X-r…
An Explanation of Remarkable Emission-line Profiles in Post-flare Coronal Rain
Judge, Philip G.; Donea, Alina; Lacatus, Daniela A.
We study broad redshifted emission in chromospheric and transition region lines that appears to correspond to a form of post-flare coronal rain. Profiles of Mg II, C II, and Si IV lines were obtained using IRIS before, during, and after the X2.1 flare of 2015 March 11 (SOL2015-03-11T16:22). We analyze the profiles of the five transitions of Mg II …