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Obscuration properties of mid-IR-selected AGN
Georgantopoulos, I.; Mountrichas, G.; Ruiz, A. +1 more
The goal of this work is to study the obscuration properties of mid-infrared (mid-IR)-selected active galactic nuclei (AGN). For that purpose, we use Wide-field Infrared Survey Explorer (WISE) sources in the Stripe 82-XMM area to identify mid-IR AGN candidates, applying the Assef et al. criteria. Stripe 82 has optical photometry ≈2 times deeper th…
The Timing Behavior of the Central Compact Object Pulsar 1E 1207.4-5209
Gotthelf, E. V.; Halpern, J. P.
We present 20 yr of timing observations for 1E 1207.4-5209, the central compact object in supernova remnant PKS 1209-51/52, to follow up on our detection of an unexpected timing glitch in its spin-down. Using new XMM-Newton and NICER observations of 1E 1207.4-5209, we now find that the phase ephemeris can be well modeled by either two small glitch…
An X-ray detection of star formation in a highly magnified giant arc
Dahle, H.; Rigby, J. R.; Bayliss, M. B. +19 more
In the past decade, our understanding of how stars and galaxies formed during the first 5 billion years after the Big Bang has been revolutionized by observations that leverage gravitational lensing by intervening masses, which act as natural cosmic telescopes to magnify background sources. Previous studies have harnessed this effect to probe the …
Spectroscopic Determination of Stellar Parameters and Oxygen Abundances for Hyades/Field G-K Dwarfs
Honda, Satoshi; Takeda, Yoichi
It has been suggested that Fe abundances of K dwarfs derived from Fe I and Fe II lines show considerable discrepancies, and oxygen abundances determined from high-excitation O I 7771-5 triplet lines are appreciably overestimated (the problem becoming more serious toward lower Teff), which, however, has not yet been widely confirmed. Wit…
Autonomous on-board data processing and instrument calibration software for the Polarimetric and Helioseismic Imager on-board the Solar Orbiter mission
Hirzberger, Johann; Solanki, Sami K.; Woch, Joachim +18 more
A frequent problem arising for deep space missions is the discrepancy between the amount of data desired to be transmitted to the ground and the available telemetry bandwidth. A part of these data consists of scientific observations, being complemented by calibration data to help remove instrumental effects. We present our solution for this discre…
The nuclear region of NGC 613 - I. Multiwavelength analysis
Steiner, J. E.; Menezes, R. B.; da Silva, Patrícia
In this paper, we report a detailed study with a variety of data from optical, near-infrared, X-ray, and radio telescopes of the nuclear region of the galaxy NGC 613 with the aim of understanding its complexity. We detected an extended stellar emission in the nucleus that, at first, appears to be, in the optical band, two stellar nuclei separated …
Kinematics of disk galaxies in (proto-)clusters at z = 1.5
Böhm, A.; Koyama, Y.; Kodama, T. +5 more
Aims: While many aspects of the impact of dense environments on late-type galaxies at redshifts below unity have been scrutinized in the past few decades, observational studies of the interplay between environment and disk galaxy evolution at z > 1 are still scarce. We observed star-forming galaxies at z ≈ 1.5 selected from the HyperSuprim…
Intrinsic Color Indices of Early-type Dwarf Stars
Jiang, Biwei; Yuan, Haibo; Deng, Dingshan +2 more
Early-type stars are short lived and scarce in comparison with other types. Based on the recently released catalogs of early-type stars from the largest Large Sky Area Multi-Object Fiber Spectroscopic Telescope spectroscopic survey, the intrinsic colors of the stars with effective temperature up to 32,000 K are determined for the bands from ultrav…
π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team
Triaud, Amaury H. M. J.; Fulton, Benjamin J.; Howard, Andrew W. +25 more
We report on the discovery of a transiting Earth-sized (0.95R⊕) planet around an M3.5 dwarf star at 57 pc, EPIC 249631677. The planet has a period of ∼3.14 days, i.e., ∼π, with an installation of 7.45 S⊕. The detection was made using publicly available data from K2's Campaign 15. We observed three additional transits with SPE…
A Systematic Search for the Reddest Far-infrared and Submillimeter Galaxies: Revealing Dust-embedded Starbursts at High Redshifts
Yan, Haojing; Ma, Zhiyuan; Huang, Jia-Sheng +1 more
We present the results of our systematic search for the reddest far-infrared (FIR) and submillimeter (sub-mm) galaxies using the data from the Herschel Multi-tiered Extragalactic Survey (HerMES) and the SCUBA2 Cosmological Legacy Survey (S2CLS). The red FIR galaxies are "500 µm risers," whose spectral energy distributions increase with wavel…