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The segregation of starless and protostellar clumps in the Hi-GAL ℓ = 224° region
Elia, D.; Olmi, L.; Cunningham, M. +1 more
Context. Stars form in dense, dusty structures, which are embedded in larger clumps of molecular clouds often showing a clear filamentary structure on large scales (≳1 pc). The origin (e.g., turbulence or gravitational instabilities) and evolution of these filaments, as well as their relation to clump and core formation, are not yet fully understo…
YSO jets in the Galactic plane from UWISH2 - III. Jets and outflows in Cassiopeia and Auriga
Froebrich, D.; Makin, S. V.
We present the analysis of 35.5 deg2 of images in the 1-0 S(1) line of H2 from the UK Widefield Infrared Survey for H2 (UWISH2) towards Cassiopeia and Auriga. We have identified 98 Molecular Hydrogen emission-line Objects (MHOs) driven by Young Stellar Objects, 60 per cent of which are bipolar outflows and all are …
V4743 Sgr, a magnetic nova?
Mukai, K.; Orio, M.; Bianchini, A. +3 more
Two XMM-Newton observations of Nova V4743 Sgr (Nova Sgr 2002) were performed shortly after it returned to quiescence, 2 and 3.5 yr after the explosion. The X-ray light curves revealed a modulation with a frequency of ≃0.75 mHz, indicating that V4743 Sgr is most probably an intermediate polar (IP). The X-ray spectra have characteristics in common w…
GRS 1739-278 Observed at Very Low Luminosity with XMM-Newton and NuSTAR
Harrison, F. A.; Stern, D.; Yamaoka, K. +19 more
We present a detailed spectral analysis of XMM-Newton and NuSTAR observations of the accreting transient black hole GRS 1739-278 during a very faint low hard state at ∼0.02% of the Eddington luminosity (for a distance of 8.5 kpc and a mass of 10 {M}⊙ ). The broadband X-ray spectrum between 0.5 and 60 keV can be well-described by a power…
Hubble Space Telescope Observations of Accretion-Induced Star Formation in the Tadpole Galaxy Kiso 5639
Rafelski, Marc; Elmegreen, Bruce G.; Gallagher, John S. +6 more
The tadpole galaxy Kiso 5639 has a slowly rotating disk with a drop in metallicity at its star-forming head, suggesting that star formation was triggered by the accretion of metal-poor gas. We present multi-wavelength Hubble Space Telescope Wide Field Camera 3 images of UV through I band plus Hα to search for peripheral emission and determine the …
Variations in Titan's dune orientations as a result of orbital forcing
Tokano, Tetsuya; Lucas, Antoine; Newman, Claire E. +6 more
Wind-blown dunes are a record of the climatic history in Titan's equatorial region. Through modeling of the climatic conditions associated with Titan's historical orbital configurations (arising from apsidal precessions of Saturn's orbit), we present evidence that the orientations of the dunes are influenced by orbital forcing. Analysis of 3 Titan…
Radio-optical galaxy shape correlations in the COSMOS field
Brown, Michael L.; Harrison, Ian; Tunbridge, Ben
We investigate the correlations in galaxy shapes between optical and radio wavelengths using archival observations of the Cosmic Evolution Survey (COSMOS) field. Cross-correlation studies between different wavebands will become increasingly important for precision cosmology as future large surveys may be dominated by systematic rather than statist…
The massive dark halo of the compact early-type galaxy NGC 1281
Gebhardt, Karl; van de Ven, Glenn; Husemann, Bernd +7 more
We investigate the compact, early-type galaxy NGC 1281 with integral field unit observations to map the stellar line-of-sight velocity distribution (LOSVD) out to five effective radii and construct orbit-based dynamical models to constrain its dark and luminous matter content. Under the assumption of mass-follows-light, the H-band stellar mass-to-…
Polarimetry observations of comets: Status, questions, future pathways
Hines, Dean C.; Levasseur-Regourd, Anny-Chantal
Polarimetric observations of comets have provided crucial insight into the composition and evolution of cometary dust particles. Herein, we present a brief overview of the polarization properties observed in comets, and some possible interpretations. We also discuss recent imaging polarimetry observations of C/2012 S1 (ISON) and 67P/Churyumov-Gera…
Kelvin–Helmholtz instability in an active region jet observed with Hinode
Srivastava, A. K.; Zhelyazkov, I.; Chandra, R.
Over past ten years a variety of jet-like phenomena were detected in the solar atmosphere, including plasma ejections over a range of coronal temperatures being observed as extreme ultraviolet (EUV) and X-ray jets. We study the possibility for the development of Kelvin–Helmholtz (KH) instability of transverse magnetohydrodynamic (MHD) waves travel…