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Carbon and oxygen in metal-poor halo stars
Asplund, M.; Amarsi, A. M.; Nissen, P. E. +2 more
Carbon and oxygen are key tracers of the Galactic chemical evolution; in particular, a reported upturn in [C/O] towards decreasing [O/H] in metal-poor halo stars could be a signature of nucleosynthesis by massive Population III stars. We reanalyse carbon, oxygen, and iron abundances in 39 metal-poor turn-off stars. For the first time, we take into…
Evidence for ram-pressure stripping in a cluster of galaxies at z = 0.7
Pointecouteau, E.; Boselli, A.; Brinchmann, J. +10 more
Multi-Unit Spectroscopic Explorer (MUSE) observations of the cluster of galaxies CGr32 (M200 ≃ 2 × 1014 M⊙) at z = 0.73 reveal the presence of two massive star-forming galaxies with extended tails of diffuse gas detected in the [O II]λλ3727-3729 Å emission-line doublet. The tails, which have a cometary shape with a…
Planck's Dusty GEMS. VII. Atomic carbon and molecular gas in dusty starburst galaxies at z = 2 to 4
Kneissl, R.; Le Floc'h, E.; Omont, A. +5 more
The bright 3P1-3P0 ([CI] 1-0) and 3P2-3P1 ([CI] 2-1) lines of atomic carbon are becoming more and more widely employed as tracers of the cold neutral gas in high-redshift galaxies. Here we present observations of these lines in the 11 galaxies of the set of Pla…
Extremely Low Molecular Gas Content in a Compact, Quiescent Galaxy at z = 1.522
Franx, Marijn; Bezanson, Rachel; Weiner, Benjamin +4 more
One of the greatest challenges to theoretical models of massive galaxy formation is the regulation of star formation at early times. The relative roles of molecular gas expulsion, depletion, and stabilization are uncertain as direct observational constraints of the gas reservoirs in quenched or quenching galaxies at high redshift are scant. We pre…
Unbiased Distribution of Binary Parameters from LAMOST and Kepler Observations
Qian, Sheng-Bang; Zhang, Jia; Wu, Yue +1 more
The parameter distribution of binaries is a fundamental knowledge of the stellar systems. A statistical study on the binary stars is carried out based on the LAMOST spectral and Kepler photometric database. We presented a catalog of 1320 binary stars with plentiful parameters, including period, binary subtype, atmosphere parameters (T eff
Long-period Giant Companions to Three Compact, Multiplanet Systems
Fulton, Benjamin J.; Hirsch, Lea A.; Howard, Andrew W. +7 more
Understanding the relationship between long-period giant planets and multiple smaller short-period planets is critical for formulating a complete picture of planet formation. This work characterizes three such systems. We present Kepler-65, a system with an eccentric (e = 0.28 ± 0.07) giant planet companion discovered via radial velocities (RVs) e…
The VLT-FLAMES Tarantula Survey. XXX. Red stragglers in the clusters Hodge 301 and SL 639
van Loon, J. Th.; Lennon, D. J.; Herrero, A. +10 more
Aims: We estimate physical parameters for the late-type massive stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud (LMC).
Methods: The observational sample comprises 20 candidate red supergiants (RSGs) which are the reddest ((B - V) > 1 mag) and brightest (V < 16 …
Jets blowing bubbles in the young radio galaxy 4C 31.04
Groves, Brent; Mukherjee, Dipanjan; Wagner, Alexander Y. +5 more
We report the discovery of shocked molecular and ionized gas resulting from jet-driven feedback in the low-redshift (z = 0.0602) compact radio galaxy 4C 31.04 using near-IR imaging spectroscopy. 4C 31.04 is a ∼100 pc double-lobed Compact Steep Spectrum source believed to be a very young active galactic nucleus (AGN). It is hosted by a giant ellipt…
The TRGB Distance to the Second Galaxy “Missing Dark Matter”: Evidence for Two Groups of Galaxies at 13.5 and 19 Mpc in the Line of Sight of NGC 1052
Trujillo, Ignacio; Monelli, Matteo
A second galaxy “missing dark matter” (NGC 1052-DF4) has been reported recently. Here we show, using the location of the tip of the red giant branch (TRGB), that the distance to this galaxy is 14.2 ± 0.7 Mpc. This locates the galaxy 6 Mpc closer than previously determined. We also analyze the distances to the brightest galaxies in the field of vie…
Probing the final-stage progenitor evolution for Type IIP Supernova 2017eaw in NGC 6946
Wang, Lifan; Wang, Xiaofeng; Zhang, Jujia +6 more
We presented a detailed analysis of progenitor properties of type IIP supernova 2017eaw in NGC 6946, based on the pre-explosion images and early-time observations obtained immediately after the explosion. An unusually red star, with MF814W = -6.9 mag and mF606W - mF814W = 2.9 ± 0.2 mag, can be identified at the SN …