Search Publications
Uniform Contribution of Supernova Explosions to the Chemical Enrichment of Abell 3112 out to R 200
Miller, Eric D.; Bulbul, Esra; Smith, Randall K. +5 more
The spatial distribution of the metals residing in the intra-cluster medium (ICM) of galaxy clusters records all the information on a cluster’s nucleosynthesis and chemical enrichment history. We present measurements from a total of 1.2 Ms Suzaku XIS and 72 ks Chandra observations of the cool-core galaxy cluster Abell 3112 out to its virial radius…
Star Formation Activity in the Molecular Cloud G35.20-0.74: Onset of Cloud-Cloud Collision
Dewangan, L. K.
To probe star formation (SF) processes, we present results of an analysis of the molecular cloud G35.20-0.74 (hereafter MCG35.2) using multi-frequency observations. The MCG35.2 is depicted in a velocity range of 30-40 km s-1. An almost horseshoe-like structure embedded within the MCG35.2 is evident in the infrared and millimeter images …
Spectral Resolution-linked Bias in Transit Spectroscopy of Extrasolar Planets
Deming, Drake; Sheppard, Kyle
We re-visit the principles of transmission spectroscopy for transiting extrasolar planets, focusing on the overlap between the planetary spectrum and the illuminating stellar spectrum. Virtually all current models of exoplanetary transmission spectra utilize an approximation that is inaccurate when the spectrum of the illuminating star has a compl…
Spatially resolved CO SLED of the Luminous Merger Remnant NGC 1614 with ALMA
Aalto, Susanne; Yun, Min S.; Kaneko, Hiroyuki +13 more
We present high-resolution (1.″0) Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO (1-0) and CO (2-1) rotational transitions toward the nearby IR-luminous merger NGC 1614 supplemented with ALMA archival data of CO (3-2) and CO (6-5) transitions. The CO (6-5) emission arises from the starburst ring (central 590 pc in radius), …
Freely Expanding Knots of X-Ray-emitting Ejecta in Kepler’s Supernova Remnant
Sato, Toshiki; Hughes, John P.
We report measurements of proper motion, radial velocity, and elemental composition for 14 compact X-ray-bright knots in Kepler’s supernova remnant (SNR) using archival Chandra data. The knots with the highest speed show both large proper motions (µ ∼ 0.″11-0.″14 yr-1) and high radial velocities (v ∼ 8700-10,020 km s-1)…
On the Statistical Properties of the Lower Main Sequence
Basu, Sarbani; Hekker, Saskia; Bellinger, Earl P. +1 more
Astronomy is in an era where all-sky surveys are mapping the Galaxy. The plethora of photometric, spectroscopic, asteroseismic, and astrometric data allows us to characterize the comprising stars in detail. Here we quantify to what extent precise stellar observations reveal information about the properties of a star, including properties that are …
High-energy Gamma-Ray Activity from V404 Cygni Detected by AGILE during the 2015 June Outburst
Verrecchia, F.; Tavani, M.; Piano, G. +2 more
The AGILE satellite detected transient high-energy γ-ray emission from the X-ray binary V404 Cygni, during the 2015 June outburst observed in radio, optical, X-ray, and soft γ-ray frequencies. The activity was observed by AGILE in the 50-400 MeV energy band, between 2015 June 24 UT 06:00:00 and 2015 June 26 UT 06:00:00 (MJD 57197.25-57199.25), wit…
The Optical Counterpart to the Accreting Millisecond X-Ray Pulsar SAX J1748.9-2021 in the Globular Cluster NGC 6440
Dalessandro, E.; Ferraro, F. R.; Lanzoni, B. +3 more
We used a combination of deep optical and {{H}}α images of the Galactic globular cluster NGC 6440, acquired with the Hubble Space Telescope, to identify the optical counterpart to the accreting millisecond X-ray pulsar SAX J1748.9-2021 during quiescence. A strong {{H}}α emission has been detected from a main-sequence star (hereafter COM-SAX J1748.…
Photoionization-driven Absorption-line Variability in Balmer Absorption Line Quasar LBQS 1206+1052
Wang, Jianguo; Zhou, Hongyan; Ji, Tuo +10 more
In this paper we present an analysis of absorption-line variability in mini-BAL quasar LBQS 1206+1052. The Sloan Digital Sky Survey spectrum demonstrates that the absorption troughs can be divided into two components of blueshift velocities of ∼700 and ∼1400 km s-1 relative to the quasar rest frame. The former component shows rare Balme…
XMM-Newton Observation of the nearby Pulsar B1133+16.
Haberl, Frank; Mitra, Dipanjan; Zhang, Bing +5 more
We constrain the X-ray properties of the nearby (360 {pc}), old (5 {Myr}) pulsar B1133+16 with ∼ 100 {ks} effective exposure time by XMM-Newton. The observed pulsar flux in the 0.2-3 keV energy range is ∼ {10}-14 {erg} {cm}}-2 {{{s}}}-1, which results in the recording of ∼600 source counts with the EPIC pn and MOS …