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Star formation efficiency and AGN feedback in narrow-line Seyfert 1 galaxies with fast X-ray nuclear winds
Feruglio, C.; García-Burillo, S.; Krongold, Y. +7 more
We present the first systematic study of the molecular gas and star formation efficiency in a sample of ten narrow-line Seyfert 1 galaxies selected to have X-ray Ultra Fast Outflows and, therefore, to potentially show AGN feedback effects. CO observations were obtained with the IRAM 30-m telescope in six galaxies and from the literature for four g…
Much ado about no offset - characterizing the anomalous multiple-image configuration and the model-driven displacement between light and mass in the multiplane strong lens Abell 3827
Griffiths, Richard E.; Wagner, Jenny; Lin, Joyce
Abell 3827 is a unique galaxy cluster with a dry merger in its core causing a highly resolved multiple-image configuration of a blue spiral galaxy at zs = 1.24. The surface brightness profiles of four merging galaxies around zd = 0.099 complicate a clear identification of the number of images and finding corresponding small-s…
Resolving the binary components of the outbursting protostar HBC 494 with ALMA
Herczeg, Gregory J.; Zhu, Zhaohuan; Pérez, Sebastián +15 more
Episodic accretion is a low-mass pre-main sequence phenomenon characterized by sudden outbursts of enhanced accretion. These objects are classified into two: protostars with elevated levels of accretion that lasts for decades or more, called FUors, and protostars with shorter and repetitive bursts, called EXors. HBC 494 is a FUor object embedded i…
A multi-technique approach to identifying and/or constraining radial-velocity substellar companions
Kiefer, F.; Lagrange, A. -M.; Rubini, P. +3 more
Context. Although more than one thousand substellar companions have already been detected with the radial velocity (RV) method, many new companions remain to be detected in the public RV archives.
Aims: We wish to use the archival data obtained with the ESO/HARPS spectrograph to search for substellar companions.
Methods: We used the astr…
X-shooter survey of young intermediate-mass stars - I. Stellar characterization and disc evolution
Pascucci, Ilaria; Petr-Gotzens, Monika G.; Panić, Olja +6 more
Intermediate-mass stars (IMSs) represent the link between low-mass and high-mass stars, and cover a key mass range for giant planet formation. In this paper, we present a spectroscopic survey of 241 young IMS candidates with IR-excess, the most complete unbiased sample to date within 300 pc. We combined VLT/X-Shooter spectra with BVR photometric o…
A Statistical Study of IRIS Observational Signatures of Nanoflares and Nonthermal Particles
Polito, Vanessa; Testa, Paola; De Pontieu, Bart +1 more
Nanoflares are regarded as one of the major mechanisms of magnetic energy release and coronal heating in the solar outer atmosphere. We conduct a statistical study on the response of the chromosphere and transition region to nanoflares, as observed by the Interface Region Imaging Spectrograph (IRIS), by using an algorithm for the automatic detecti…
A geometric calibration of the tip of the red giant branch in the Milky Way using Gaia DR3
Lidman, C.; Flynn, C.; Dixon, M. +3 more
We use the latest parallaxes measurements from Gaia DR3 to obtain a geometric calibration of the tip of the red giant branch (TRGB) in Cousins I magnitudes as a standard candle for cosmology. We utilize the following surveys: SkyMapper DR3, APASS DR9, ATLAS Refcat2, and Gaia DR3 synthetic photometry to obtain multiple zero-point calibrations of th…
Identifying Lyα emitter candidates with Random Forest: Learning from galaxies in the CANDELS survey
Castellano, M.; Pentericci, L.; Fynbo, J. P. U. +8 more
The physical processes that make a galaxy a Lyman alpha emitter have been extensively studied over the past 25 yr. However, the correlations between physical and morphological properties of galaxies and the strength of the Lyα emission line are still highly debated. Here, we investigate the correlations between the rest-frame Lyα equivalent width …
The Dragonfly Galaxy. III. Jet Brightening of a High-redshift Radio Source Caught in a Violent Merger of Disk Galaxies
Prochaska, J. Xavier; De Breuck, Carlos; Burchett, Joseph N. +8 more
The Dragonfly galaxy (MRC 0152-209), the most infrared-luminous radio galaxy at redshift z ~ 2, is a merger system containing a powerful radio source and large displacements of gas. We present kiloparsec-resolution data from the Atacama Large Millimeter/submillimeter Array and the Very Large Array of carbon monoxide (6-5), dust, and synchrotron co…
A sub-Neptune planet around TOI-1695 discovered and characterized with SPIRou and TESS
Carmona, A.; Donati, J. -F.; Winn, J. N. +39 more
TOI-1695 is a V-mag = 13 M-dwarf star from the northern hemisphere at 45 pc from the Sun, around which a 3.134-day periodic transit signal from a super-Earth candidate was identified in TESS photometry. With a transit depth of 1.3 mmag, the radius of candidate TOI-1695.01 was estimated by the TESS pipeline to be 1.82 R⊕ with an equilibr…