Search Publications
SDSS-IV MaNGA: Cannibalism Caught in the Act-On the Frequency of Occurrence of Multiple Cores in Brightest Cluster Galaxies
Merrifield, Michael; Brownstein, Joel R.; Pan, Kaike +16 more
Although it is generally accepted that massive galaxies form in a two-phased fashion, beginning with a rapid mass buildup through intense starburst activities followed by primarily dry mergers that mainly deposit stellar mass at outskirts, the late time stellar mass growth of brightest cluster galaxies (BCGs), the most massive galaxies in the univ…
Establishing the accuracy of asteroseismic mass and radius estimates of giant stars. III. KIC 4054905, an eclipsing binary with two 10 Gyr thick disk RGB stars
Grundahl, F.; Lund, M. N.; Miglio, A. +16 more
Context. Eclipsing binary stars with an oscillating giant component allow accurate stellar parameters to be derived and asteroseismic methods to be tested and calibrated. To this aim, suitable systems need to be firstly identified and secondly measured precisely and accurately. KIC 4054905 is one such system, which has been identified, but with me…
On the peculiar long-term orbital evolution of the eclipsing accreting millisecond X-ray pulsar SWIFT J1749.4 - 2807
Altamirano, D.; Albayati, A. C.; Sanna, A. +16 more
We present the pulsar timing analysis of the accreting millisecond X-ray pulsar SWIFT J1749.4 - 2807 monitored by NICER and XMM-Newton during its latest outburst after almost 11 yr of quiescence. From the coherent timing analysis of the pulse profiles, we updated the orbital ephemerides of the system. Large phase jumps of the fundamental frequency…
Mapping the Brightness of Ganymede's Ultraviolet Aurora Using Hubble Space Telescope Observations
Saur, J.; Strobel, D. F.; Roth, L. +4 more
We analyze Hubble Space Telescope observations of Ganymede made with the Space Telescope Imaging Spectrograph between 1998 and 2017 to generate a brightness map of Ganymede's oxygen emission at 1,356 Å. Our Mercator projected map demonstrates that the brightness along Ganymede's northern and southern auroral ovals strongly varies with longitude. T…
The Emission Spectrum of the Hot Jupiter WASP-79b from HST/WFC3
Mikal-Evans, Thomas; Sing, David K.; López-Morales, Mercedes +12 more
Here we present a thermal emission spectrum of WASP-79b, obtained via Hubble Space Telescope Wide Field Camera 3 G141 observations as part of the PanCET program. As we did not observe the ingress or egress of WASP-79b's secondary eclipse, we consider two scenarios: a fixed mid-eclipse time based on the expected occurrence time, and a mid-eclipse t…
Mapping the X-Ray Corona Evolution of IRAS 13224-3809 with the Power Spectral Density
Chainakun, Poemwai; Luangtip, Wasuthep; Jiang, Jiachen +1 more
We develop the power spectral density (PSD) model to explain the nature of the X-ray variability in IRAS 13224-3809, including the full effects of the X-ray reverberation due to the lamppost source. We utilize 16 XMM-Newton observations individually as well as group them into three different luminosity bins: low, medium, and high. The soft (0.3-1 …
AGC 226178 and NGVS 3543: Two Deceptive Dwarfs toward Virgo
Cresci, Giovanni; Cannon, John M.; Haynes, Martha P. +21 more
The two sources AGC 226178 and NGVS 3543, an extremely faint, clumpy, blue stellar system and a low surface brightness dwarf spheroidal, are adjacent systems in the direction of the Virgo cluster. Both have been studied in detail previously, with it being suggested that they are unrelated normal dwarf galaxies or that NGVS 3543 recently lost its g…
Deuteration of c-C3H2 towards the pre-stellar core L1544
Caselli, P.; Spezzano, S.; Sipilä, O. +7 more
Context. In the centre of pre-stellar cores, the deuterium fractionation is enhanced due to the cold temperatures and high densities. Therefore, the chemistry of deuterated molecules can be used to probe the evolution and the kinematics in the earliest stages of star formation.
Aims: We analyse emission maps of cyclopropenylidene, c-C3
SIRIUS Project - V. Formation of off-centre ionized bubbles associated with Orion Nebula Cluster
Shimajiri, Yoshito; Hattori, Kohei; Wang, Long +4 more
Massive stars born in star clusters terminate star cluster formation by ionizing the surrounding gas. This process is considered to be prevalent in young star clusters containing massive stars. The Orion Nebula is an excellent example associated with a forming star cluster including several massive stars (the Orion Nebula Cluster, ONC) and a 2-pc-…
Searching for anomalous microwave emission in nearby galaxies. K-band observations with the Sardinia Radio Telescope
Bianchi, S.; Madden, S. C.; Galliano, F. +9 more
Aims: We observed four nearby spiral galaxies (NGC 3627, NGC 4254, NGC 4736, and NGC 5055) in the K band with the 64-m Sardinia Radio Telescope, with the aim of detecting anomalous microwave emission (AME), a radiation component presumably due to spinning dust grains, which has been observed thus far in the Milky Way and only in a handful of …