Search Publications
Wavelet analysis of the magnetotail response to solar wind fluctuations during HILDCAA events
Echer, Ezequiel; Marques de Souza Franco, Adriane; José Alves Bolzan, Mauricio
In this work a study of the effects of the high-intensity long-duration continuous AE activity (HILDCAAs) events in the magnetotail was conducted. The aim of this study was to search the main frequencies during HILDCAAs in the Bx component of the geomagnetic field in the magnetotail, as well as the main frequencies, at which the magneto…
Metallicity and absolute magnitude calibrations for F-G type main-sequence stars in the Gaia era
Bilir, S.; Ak, T.; Yontan, T. +3 more
In this study, photometric metallicity and absolute magnitude calibrations were derived using F-G spectral type main-sequence stars in the Solar neighbourhood with precise spectroscopic, photometric and Gaia astrometric data for UBV photometry. The sample consists of 504 main-sequence stars covering the temperature, surface gravity and colour inde…
Multiwavelength Study of the X-Ray Bright Supernova Remnant N300-S26 in NGC 300
Williams, Benjamin F.; Garofali, Kristen; Gross, Jacob +3 more
We present a multiwavelength examination of the supernova remnant (SNR) S26 in the nearby galaxy NGC 300 using data from Chandra X-ray Observatory, XMM-Newton X-ray Observatory, Hubble Space Telescope (HST), the Very Large Array, and the Australia Telescope Compact Array. We simultaneously fit all of the available X-ray data with a thermal plasma …
OGLE-2018-BLG-0022: First Prediction of an Astrometric Microlensing Signal from a Photometric Microlensing Event
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +68 more
In this work, we present the analysis of the binary microlensing event OGLE-2018-BLG-0022 that is detected toward the Galactic bulge field. The dense and continuous coverage with the high-quality photometry data from ground-based observations combined with the space-based Spitzer observations of this long timescale event enables us to uniquely det…
Selection of M-dwarfs using Gaia, WISE, and 2MASS
Tinney, C. G.; Sharma, S.; Wright, D. +1 more
We present criteria for the selection of M-dwarfs down to G < 14.5 using all-sky survey data, with a view to identifying potential M-dwarfs, to be confirmed spectroscopically by the FunnelWeb survey. Two sets of criteria were developed. The first, based on absolute magnitude in the Gaia G passband, with MG > 7.7, selects 76,392 st…
The interplay between active galactic nuclei and star formation activities of type 1 active galactic nuclei probed by polycyclic aromatic hydrocarbon 3.3 µm emission feature with AKARI
Nakagawa, Takao; Oyabu, Shinki; Ohyama, Youichi +11 more
We investigate the connection between active galactic nucleus (AGN) and star formation activities of AGN host galaxies by studying the 3.3 µm polycyclic aromatic hydrocarbon (PAH) emission feature of 79 type 1 AGNs using the AKARI space telescope. Utilizing the slitless spectroscopic capability of the AKARI Infrared Camera, we obtained the s…
X-ray activity from different types of stars
Zhang, Yong; Soria, Roberto; Bai, Yu +10 more
X-ray emission is an important indicator of stellar activity. In this paper, we study stellar X-ray activity using the XMM-Newton and LAMOST data for different types of stars. We provide a sample including 1259 X-ray-emitting stars, of which 1090 have accurate stellar parameter estimations. Our sample size is much larger than those used in previou…
Warm CO in evolved stars from the THROES catalogue. II. Herschel/PACS spectroscopy of C-rich envelopes
García-Lario, P.; Sánchez Contreras, C.; da Silva Santos, J. M. +1 more
Context. This is the second paper of a series making use of Herschel/PACS spectroscopy of evolved stars in the THROES catalogue to study the inner warm regions of their circumstellar envelopes (CSEs).
Aims: We analyse the CO emission spectra, including a large number of high-J CO lines (from J = 14-13 to J = 45-44, ν = 0), as a proxy for the …
The loud and the quiet: searching for radio counterparts of two radio-weak BL Lac candidates with VLBI
Frey, Sándor; Yang, Jun; An, Tao +4 more
BL Lac objects are known to have compact jets inclined to our line of sight at a small angle, showing prominent radio emission. Two radio-weak BL Lac candidates with no counterparts in current radio surveys were recently reported by Massaro et al. Both sources were selected as candidate low-energy counterparts of unassociated Fermi γ-ray sources. …
Signal enhancement for planetary radar sounders
Seu, R.; Mastrogiuseppe, M.; Piazzo, L. +1 more