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Optical observations and dust modelling of comet 156P/Russell-LINEAR
Aravind, K.; Halder, Prithish; Ganesh, Shashikiran +5 more
Comet 156P/Russell-LINEAR is a short period Jupiter family comet with an orbital period of 6.44 years. The results from spectroscopic, photometric, polarimetric observations and dust modelling studies are presented here. From the spectroscopic study, strong emissions from CN(Δν = 0) , C3 (λ 4050 Å), C2(Δν = + 1) and C2
Spectroscopy of an extreme [O III] emitting active galactic nucleus at z = 3.212: implications for the reionization era
Feltre, Anna; Charlot, Stéphane; Shapley, Alice E. +4 more
Reionization-era galaxies often display intense nebular emission lines, both in rest-frame optical ([O III] + H β) and ultraviolet (UV; C III], C IV). How such strong nebular emission is powered remains unclear, with both active galactic nuclei (AGNs) and hot stars considered equally viable. The UV continuum slopes of these early systems tend to b…
Searching the SETI Ellipsoid with Gaia
Davenport, James R. A.; Siemion, Andrew P. V.; Cody, Ann Marie +4 more
The search for extraterrestrial intelligence (SETI) Ellipsoid is a geometric method for prioritizing technosignature observations based on the strategy of receiving signals synchronized to conspicuous astronomical events. Precise distances to nearby stars from Gaia makes constraining Ellipsoid crossing times possible. Here we explore the utility o…
The spatial evolution of young massive clusters. III. Effect of the Gaia filter on 2D spatial distribution studies
Buckner, Anne S. M.; Khorrami, Zeinab; González, Marta +3 more
Context. With the third release of the high-precision optical-wavelength Gaia survey, we are in a better position than ever before to study young clusters. However, Gaia is limited in the optical down to G ∼ 21 mag, and therefore it is essential to understand the biases introduced by a magnitude-limited sample on spatial distribution studies.
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The Population of Compact Radio Sources in M17
Menten, Karl M.; Rodríguez, Luis F.; Loinard, Laurent +7 more
We present a catalog of radio sources of the M17 region based on deep X-band radio observations centered at 10 GHz obtained with the Jansky Very Large Array in the A configuration. We detect a total of 194 radio sources, 12 of them extended and 182 compact. We find that a significant fraction (at least 40% in our catalog) have suspected gyrosynchr…
Discovery of a Filamentary Synchrotron Structure Connected to the Coherent Magnetic Field in the Outer Galaxy
Ricci, R.; Safi-Harb, S.; Kothes, R. +9 more
Using data from the Galactic Arecibo L-band Feed Array Continuum Transit Survey, we report the discovery of two previously unidentified, very compressed, thin, and straight polarized filaments approximately centered at Galactic coordinates, (l, b) = (182.°5, - 4.°0), which we call G182.5-4.0. Using data from the Isaac Newton Telescope Galactic Pla…
The origin of the high-mass X-ray binary 4U 2206+54/BD+532790
Neuhäuser, R.; Mugrauer, M.; Stoyanov, K. A. +7 more
Based on the Gaia EDR3 astrometric parameters and our new systemic radial velocity of the high-mass X-ray binary 4U 2206+54/BD+532790, we studied the trace back motion of the system and propose that it originated in the subgroup of the Cepheus OB1 association (Age ~4-10 Myr) with its brightest star, BD+532820 (B0V; ${\cal L}$~104.7${\ca…
A rare phosphorus-rich star in an eclipsing binary from TESS
Kama, Mihkel; Folsom, Colin P.; Eenmäe, Tõnis +6 more
Context. Few exoplanets around hot stars with radiative envelopes have been discovered, although new observations from the TESS mission are improving this. Stars with radiative envelopes have little mixing at their surface, and thus their surface abundances provide a sensitive test case for a variety of processes, including potentially star-planet…
Removal of straylight from ExoMars NOMAD-UVIS observations
Vandaele, Ann Carine; Daerden, Frank; Ristic, Bojan +13 more
We present an in-flight straylight removal method for the Ultraviolet and Visible Spectrometer (UVIS) channel of the Nadir and Occultation for Mars Discovery (NOMAD) instrument aboard the ExoMars Trace Gas Orbiter (TGO). The presence of a 'red-leak' straylight signal in the UVIS instrument was discovered post-launch in ground calibration measureme…
Detection of Stellar-like Abundance Anomalies in the Slow Solar Wind
Warren, Harry P.; Brooks, David H.; Baker, Deborah +2 more
The elemental composition of the Sun's hot atmosphere, the corona, shows a distinctive pattern that is different from the underlying surface or photosphere. Elements that are easy to ionize in the chromosphere are enhanced in abundance in the corona compared to their photospheric values. A similar pattern of behavior is often observed in the slow-…