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Tentative detection of the circumgalactic medium of the isolated low-mass dwarf galaxy WLM
McQuinn, Kristen B. W.; Lockman, Felix J.; Fox, Andrew J. +7 more
We report a tentative detection of the circumgalactic medium (CGM) of Wolf-Lundmark-Melotte (WLM), an isolated, low-mass (logM*/M⊙ ≈ 7.6), dwarf irregular galaxy in the Local Group (LG). We analyse an HST/COS archival spectrum of a quasar sightline (PHL2525), which is 45 kpc (0.5 virial radius) from WLM and close to the Magel…
Co-spatial UV-optical HST/STIS spectra of six planetary nebulae: nebular and stellar properties
Corradi, Romano L. M.; Balick, Bruce; Shaw, Richard A. +4 more
This paper represents the conclusion of a project that had two main goals: (1) to investigate to what extent planetary nebulae (PNe) are chemically homogeneous; and (2) to provide physical constraints on the central star properties of each PN. We accomplished the first goal by using HST/STIS spectra to measure the abundances of seven elements in n…
A combined X-ray, optical, and radio view of the merging galaxy cluster MACS J0417.5-1154
Simionescu, A.; Limousin, M.; Raychaudhury, S. +3 more
We present a comprehensive multiwavelength analysis of the merging galaxy cluster MACS J0417.5-1154 at a redshift of z = 0.44, using available images red obtained with Chandra in X-ray, Subaru, Hubble Space Telescope (HST) in optical, Giant Metrewave Radio Telescope (GMRT) in radio, and Bolocam at 2.1 mm wavelength. This is an example of a complex…
Evidence of New Magnetic Transitions in Late-type Dwarfs from Gaia DR2
Spada, Federico; Distefano, Elisa; Lanzafame, Alessandro C. +1 more
The second Gaia data release contains the identification of 147,535 low-mass (≲ 1.4 {M}⊙ ) rotational modulation variable candidates on (or close to) the main sequence, together with their rotation period and modulation amplitude. The richness, the period and amplitude range, and the photometric precision of this sample make it possible…
Thermal Emission and Magnetic Beaming in the Radio and X-Ray Mode-switching PSR B0943+10
Mereghetti, Sandro; Turolla, Roberto; Potekhin, Alexander Y. +3 more
PSR B0943+10 is a mode-switching radio pulsar characterized by two emission modes with different radio and X-ray properties. Previous studies, based on simple combinations of blackbody and power-law models, showed that its X-ray flux can be decomposed in a pulsed thermal plus an unpulsed nonthermal components. However, if PSR B0943+10 is a nearly …
Multiple populations in integrated light spectroscopy of intermediate-age clusters
Salaris, Maurizio; Kamann, Sebastian; Schiavon, Ricardo P. +9 more
The presence of star-to-star light-element abundance variations (also known as multiple populations, MPs) appears to be ubiquitous within old and massive clusters in the Milky Way and all studied nearby galaxies. Most previous studies have focused on resolved images or spectroscopy of individual stars, although there has been significant effort in…
The UBV Color Evolution of Classical Novae. III. Time-stretched Color-Magnitude Diagram of Novae in Outburst
Kato, Mariko; Hachisu, Izumi
We propose a modified color-magnitude diagram for novae in outburst, i.e., (B - V)0 versus (M V - 2.5 log f s), where f s is the time-scaling factor of a (target) nova against a comparison (template) nova, (B - V)0 is the intrinsic B - V color, and M V is the absolute V magnitud…
LMC S154: the first Magellanic symbiotic recurrent nova
Gromadzki, Mariusz; Miszalski, Brent; Iłkiewicz, Krystian +3 more
Classical nova outburst has been suggested for a number of extragalactic symbiotic stars, but in none of the systems has it been proven. In this work we study the nature of one of these systems, LMC S154. We gathered archival photometric observations in order to determine the timescales and nature of variability in this system. Additionally we car…
XMM-Newton RGS Spectroscopy of the M31 Bulge. I. Evidence for a Past AGN Half a Million Years Ago
Wang, Q. Daniel; Li, Zhiyuan; Foster, Adam R. +3 more
Existing analysis based on spectra from the Reflection Grating Spectrometer (RGS) on board XMM-Newton already shows that the G-ratio of the O VII Heα triplet in the inner bulge of M31 is too high to be consistent with a pure optically thin thermal plasma in collisional ionization equilibrium (CIE). Different processes that may affect properties of…
CALSPEC: Wide Field Camera 3 Infrared Grism Spectrophotometry
Bohlin, Ralph C.; Deustua, Susana E.
The collections of spectral energy distributions (SEDs) in the Hubble Space Telescope (HST) CALSPEC database are augmented by 19 infrared (IR) SEDs from Wide Field Camera 3 (WFC3) IR grism spectra. Together, the two IR grisms, G102 and G141, cover the 0.8-1.7 µm range with resolutions of R = 200 and 150, respectively. These new WFC3 SEDs ove…