Search Publications
Unveiling the Physics of Low-luminosity AGNs through X-Ray Variability: LINER versus Seyfert 2
González-Martín, O.; Perea, J.; Márquez, I. +2 more
X-ray variability is very common in active galactic nuclei (AGNs), but these variations may not occur similarly in different families of AGNs. We aim to disentangle the structure of low-ionization nuclear emission-line regions (LINERs) compared to Seyfert 2s by the study of their spectral properties and X-ray variations. We assembled the X-ray spe…
PALOMA: A Magnetic CV between Polars and Intermediate Polars
Pandey, J. C.; Singh, K. P.; Joshi, Arti +1 more
We present analyses of archival X-ray data obtained from the XMM-Newton satellite and optical photometric data obtained from 1 m class telescopes of ARIES, Nainital of a magnetic cataclysmic variable (MCV) Paloma. Two persistent periods at 156 ± 1 minutes and 130 ± 1 minutes are present in the X-ray data, which we interpret as the orbital and spin…
A Solar Flare Disturbing a Light Wall above a Sunspot Light Bridge
Hou, Yijun; Li, Ting; Yang, Shuhong +3 more
With the high-resolution data from the Interface Region Imaging Spectrograph, we detect a light wall above a sunspot light bridge in the NOAA active region (AR) 12403. In the 1330 Å slit-jaw images, the light wall is brighter than the ambient areas while the wall top and base are much brighter than the wall body, and it keeps oscillating above the…
Suzaku X-ray Observations of the Nearest Non-Cool Core Cluster, Antlia: Dynamically Young but with Remarkably Relaxed Outskirts
Sarazin, Craig L.; Reiprich, Thomas H.; Wik, Daniel R. +4 more
We present the results of seven Suzaku mosaic observations (>200 ks in total) of the nearest non-cool core cluster, the Antlia Cluster (or Group), beyond its degree-scale virial radius in its eastern direction. The temperature is consistent with the scaled profiles of many other clusters. Its pressure follows the universal profile. The density …
The Supernova Impostor PSN J09132750+7627410 and Its Progenitor
Zaggia, S.; Ochner, P.; Cappellaro, E. +11 more
We report the results of our follow-up campaign of the supernova impostor PSN J09132750+7627410, based on optical data covering ∼250 days. From the beginning, the transient shows prominent narrow Balmer lines with P-Cygni profiles, with a blueshifted absorption component becoming more prominent with time. Along the ∼3 months of the spectroscopic m…
The Shaping of the Multipolar Pre-planetary Nebula CRL 618 by Multidirectional Bullets
Lee, Chin-Fei; Moraghan, Anthony; Smith, Michael +1 more
In order to understand the formation of the multipolar structures of the pre-planetary nebula CRL 618, we perform 3D simulations using a multidirectional bullet model. The optical lobes of CRL 618 and fast molecular outflows at the tips of the lobes have been found to have similar expansion ages of ∼100 yr. Additional fast molecular outflows were …
Chandra Observations of Eight Sources Discovered by INTEGRAL
Rahoui, Farid; Fornasini, Francesca M.; Bodaghee, Arash +5 more
We report on 0.3-10 keV observations with the Chandra X-ray Observatory of eight hard X-ray sources discovered within 8° of the Galactic plane by the International Gamma-ray Astrophysics Laboratory satellite. The short (∼5 ks) Chandra observations of the IGR source fields have yielded very likely identifications of X-ray counterparts for three of …
XMM-Newton Slew Survey Observations of the Gravitational Wave Event GW150914
Troja, E.; Salvaterra, R.; Read, A. M. +1 more
The detection of the first gravitational wave (GW) transient GW150914 prompted an extensive campaign of follow-up observations at all wavelengths. Although no dedicated XMM-Newton observations have been performed, the satellite passed through the GW150914 error region during normal operations. Here we report the analysis of the data taken during t…
CARMA Large Area Star Formation Survey: Dense Gas in the Young L1451 Region of Perseus
Kwon, Woojin; Meisner, Aaron M.; Kauffmann, Jens +18 more
We present a 3 mm spectral line and continuum survey of L1451 in the Perseus Molecular Cloud. These observations are from the CARMA Large Area Star Formation Survey (CLASSy), which also imaged Barnard 1, NGC 1333, Serpens Main, and Serpens South. L1451 is the survey region with the lowest level of star formation activity—it contains no confirmed p…
Strong Lyα Emission in the Proximate Damped Lyα Absorption Trough toward the Quasar SDSS J095253.83+011422.0
Shu, Xinwen; Gu, Qiusheng; Li, Zhenzhen +10 more
SDSS J095253.83+011422.0 (J0952+0114) was reported by Hall et al. as an exotic quasar at zem = 3.020. In contrast to prominent broad metal-line emission with FWHM ∼ 9000 km s-1, only a narrow Lyα emission line is present with FWHM ∼ 1000 km s-1. The absence of a broad Lyα emission line has been a mystery for more t…