Search Publications
Nonthermal Velocity in the Transition Region of Active Regions and Its Center-to-limb Variation
Tripathi, Durgesh; Ghosh, Avyarthana; Klimchuk, James A.
We derive the nonthermal velocities (NTVs) in the transition region of an active region using the Si IV 1393.78 Å line observed by the Interface Region Imaging Spectrograph and compare them with the line-of-sight photospheric magnetic fields obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory. The active region…
Optical Properties of Interstellar Dust around the Orion A Molecular Cloud
Dobashi, Kazuhito; Shimoikura, Tomomi; Naoi, Takahiro +2 more
We have studied optical properties of interstellar dust around the Orion A molecular cloud to investigate the size distribution and the composition of dust grains. Orion A is one of the most studied molecular clouds in the solar vicinity (d ≃ 400 pc). In this paper, we used optical and near-infrared photometric data. The optical data were obtained…
Deep Observations of CO and Free-Free Emission in Ultraluminous Infrared QSO IRAS F07599+6508
Kohno, Kotaro; Daddi, Emanuele; Gao, Yu +4 more
Infrared quasi-stellar objects (IR QSOs) are a rare subpopulation selected from ultraluminous infrared galaxies (ULIRGs) and have been regarded as promising candidates of ULIRG-to-optical QSO transition objects. Here we present NOEMA observations of the CO (1-0) line and 3 mm continuum emission in IR QSO IRAS F07599+6508 at z = 0.1486, which has m…
Searching for Surviving Companion in the Young SMC Supernova Remnant 1E 0102.2-7219
Ruiter, Ashley J.; Chu, You-Hua; Li, Chuan-Jui +3 more
1E 0102.2-7219 (hereafter E0102) is a young supernova remnant (SNR) in the Small Magellanic Cloud. It contains oxygen-rich SN ejecta, a possible neutron star (NS), and a small amount of fast-moving H-rich ejecta material. These properties are also seen in Cas A; it has thus been suggested that E0102 is also a Type IIb SNR, whose SN progenitor's hy…
A Long-Term Study of Ultraluminous X-ray Sources in NGC 891
Earley, Nicholas M.; Dwarkadas, Vikram V.; Cirillo, Victoria
We perform empirical fits to the Chandra and XMM-Newton spectra of three ultraluminous X-ray sources (ULXs) in the edge-on spiral galaxy NGC 891, monitoring the region over a 17-year time window. One of these sources was visible since the early 1990s with ROSAT and was observed multiple times with Chandra and XMM-Newton. Another was visible since …
Identification of a new spectral signature at 3 µm over Martian northern high latitudes: Implications for surface composition
Montmessin, Franck; Vincendon, Mathieu; Beck, Pierre +1 more
Mars northern polar latitudes are known to harbor an enhanced 3 µm spectral signature when observed from orbit. This may indicate a greater amount of surface adsorbed or bound water, although it has not yet been possible to easily reconcile orbital observations with ground measurements by Phoenix. Here we re-analyzed OMEGA/Mars Express obser…
GG Carinae: discovery of orbital-phase-dependent 1.583-day periodicities in the B[e] supergiant binary
Podsiadlowski, Philipp; Porter, Augustus; Blundell, Katherine +1 more
GG Carinae (GG Car) is a binary whose primary component is a B[e] supergiant. Using photometric data from the Transiting Exoplanet Survey Satellite (TESS), All Sky Automated Survey (ASAS), Optical Monitoring Camera (OMC), and All Sky Automated Survey for Supernovae (ASAS-SN), and spectroscopic data from the Global Jet Watch to study visible He I, …
Using Cosmic Rays Detected by HST as Geophysical Markers. I. Detection and Characterization of Cosmic Rays
Tancredi, Gonzalo; Deustua, Susana E.; Miles, Nathan D. +3 more
The Hubble Space Telescope (HST) has been operational for over 30 years, and throughout that time it has been bombarded by high-energy charged particles colloquially referred to as cosmic rays. In this paper, we present a comprehensive study of more than 1.2 billion cosmic rays observed with HST using a custom-written Python package, HSTcosmicrays…
Spatial segregation impact on star formation in nearby dwarf spheroidal galaxies
Makarova, L. N.; Makarov, D. I.
Using our Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) observations of the recently found isolated dwarf spheroidal (dSph) galaxies, we homogeneously measured their star formation histories (SFHs). We determined SF rate as a function of time, as well as age and metallicity of the stellar populations. All objects demonstrate complex…
Gamma-ray bursts as probes of high-redshift Lyman-α emitters and radiative transfer models
Salvaterra, R.; Milvang-Jensen, B.; Fynbo, J. P. U. +7 more
Aims: We present the updated census and statistics of Lyman-α emitting long gamma-ray burst host galaxies (LAE-LGRBs). We investigate the properties of a subsample of LAE-LGRBs and test the shell model that is commonly used to fit Lyman-α (Lyα) emission line spectra.
Methods: We considered all LGRB host galaxies with relevant publicly av…