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Unusual infrared emission toward Sgr B2: possible planar C24
Li, Aigen; Xiang, Fu-Yuan; Yang, Xue-Juan +1 more
Interstellar graphene could be present in the interstellar medium (ISM), resulting from the photochemical processing of polycyclic aromatic hydrocarbon (PAH) molecules and/or collisional fragmentation of graphitic particles. Indeed, by comparing the observed ultraviolet (UV) extinction and infrared (IR) emission of the diffuse ISM with that predic…
A Six-year Image-subtraction Light Curve of SN2010jl
Sollerman, J.; Gal-Yam, A.; Kulkarni, S. R. +9 more
SN 2010jl was a luminous Type IIn supernova (SN), detected in radio, optical, X-ray and hard X-rays. Here we report on its six-year R- and g-band light curves obtained using the Palomar Transient Factory. The light curve was generated using a pipeline based on the proper image-subtraction method and we discuss the algorithm performances. As noted …
Conjunction Observations of Energetic Oxygen Ions O+ Accumulated in the Sequential Flux Ropes in the High-Altitude Cusp
Dandouras, I.; Reme, H.; Wang, Chi +5 more
Conjunction observations of the magnetic field and plasma by Cluster and TC-1 at the dayside magnetosphere are presented to investigate the sequential flux ropes transferred from the low latitude boundary layer to the high-altitude cusp on 10 March 2004.Three sequential flux ropes originating from the dayside low latitude magnetopause are first de…
Star formation and gas in the minor merger UGC 10214
Boquien, M.; Xu, C. K.; Verley, S. +6 more
Minor mergers play a crucial role in galaxy evolution. UGC 10214 (the Tadpole galaxy) is a prime example of this process in which a dwarf galaxy has interacted with a large spiral galaxy ∼250 Myr ago and produced a perturbed disc and a giant tidal tail. We used a multi-wavelength dataset that partly consists of new observations (Hα, HI, and CO) an…
Explaining the asymmetric line profile in Cepheus X-4 with spectral variation across pulse phase
Fürst, Felix; Pottschmidt, Katja; Ballhausen, Ralf +4 more
The high mass X-ray binary Cepheus X-4, during its 2014 outburst, showed evidence for an asymmetric cyclotron line in its hard X-ray spectrum. The 2014 spectrum provides one of the clearest cases of an asymmetric line profile among all studied sources with Cyclotron Resonance Scattering Features (CRSF). We present a phase-resolved analysis of NuST…
A Spectroscopic Analysis of the Hyades Cool Giants
Gray, David F.; Martinez, A.
High-resolution spectroscopic observations of the four cool giants in the Hyades cluster, taken at the Elginfield Observatory, are analyzed. The velocity of γ Tau between 2002 and 2009 is constant to a few m s-1 small variations, compatible with the planetary orbit, are seen for ɛ Tau. The primary-to-secondary mass ratio of θ 1
The activity of the symbiotic binary Z Andromedae and its latest outburst
Merc, J.; Gális, R.; Wolf, M. +2 more
Z Andromedae is a prototype of classical symbiotic variable stars. It is characterized by alternating of quiescent and active stages, the later ones are accompanied by changes in both photometry and spectral characteristics of this object. The current activity of Z And began in 2000, and the last outburst was recorded at the turn of years 2017 and…
Prospects for Extending the Mass-Metallicity Relation to Low Mass at High Redshift: A Case Study at z ∼ 1
Cameron, Alex J.; Henry, Alaina; Trenti, Michele +5 more
We report J-band MOSFIRE spectroscopy of a low-mass ({log}({M}* /{M}⊙ )={8.62}-0.06+0.10) star-forming galaxy at z = 0.997 showing the detection of [N II] and [S II] alongside a strong Hα line. We derive a gas-phase metallicity of {log}({{O}}/{{H}})={7.99}-0.23+0.13, placing this ob…
Spectrophotometric variegation of the layering in comet 67P/Churyumov-Gerasimenko as seen by OSIRIS
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +40 more
Context. Between August 2014 and September 2016, the ESA space mission Rosetta escorted comet 67P/Churyumov-Gerasimenko (67P) during its perihelion passage. The onboard OSIRIS Narrow Angle Camera (NAC) acquired high-resolution multispectral images of the cometary surface. These datasets allowed a characterization of the spectrophotometric variegat…
Suzaku observation of diffuse X-ray emission from a southwest region of the Carina Nebula
Hamaguchi, Kenji; Ezoe, Yuichiro; Ohashi, Takaya +2 more
A southwest region of the Carina Nebula was observed with the Suzaku observatory for 47ks in 2010 December. This region shows distinctively soft X-ray emission in the Chandra campaign observations. Suzaku clearly detects the diffuse emission above known foreground and background components between 0.4-5keV at the surface brightness of 3.3× 10^{-14…