Search Publications
Evidence for Thermal X-Ray Line Emission from the Synchrotron-dominated Supernova Remnant RX J1713.7-3946
Acero, Fabio; Katsuda, Satoru; Petre, Robert +14 more
We report the first detection of thermal X-ray line emission from the supernova remnant (SNR) RX J1713.7-3946, the prototype of the small class of synchrotron-dominated SNRs. A softness-ratio map generated using XMM-Newton data shows that faint interior regions are softer than bright shell regions. Using Suzaku and deep XMM-Newton observations, we…
No Evidence of Mass Segregation in the Low-mass Galactic Globular Cluster NGC 6101
Dalessandro, E.; Massari, D.; Beccari, G. +3 more
We used a combination of Hubble Space Telescope and ground-based data to probe the dynamical state of the low-mass Galactic globular cluster NGC 6101. We have rederived the structural parameters of the cluster by using star counts and we find that it is about three times more extended than thought before. By using three different indicators, namel…
Observational Evidence of Electron-driven Evaporation in Two Solar Flares
Li, D.; Zhang, Q. M.; Ning, Z. J.
We have explored the relationship between hard X-ray (HXR) emissions and Doppler velocities caused by the chromospheric evaporation in two X1.6 class solar flares on 2014 September 10 and October 22, respectively. Both events display double ribbons and the Interface Region Imaging Spectrograph slit is fixed on one of their ribbons from the flare o…
Stellar Mass Functions of Galaxies At 4 < z < 7 from an IRAC-selected Sample in Cosmos/Ultravista: Limits on the Abundance of Very Massive Galaxies
van Dokkum, Pieter G.; Muzzin, Adam; Labbé, Ivo +7 more
We build a Spitzer IRAC-complete catalog of objects complementing the Ks-band selected UltraVISTA catalog with objects detected in IRAC only. To identify massive (log ({{M}*}/{{M}⊙ })\gt 11) galaxies at 4\lt z\lt 7, we consider the systematic effects on photometric redshift measurements from the introduction of an …
Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust
Wang, Lifan; Krisciunas, Kevin; Siegel, Michael +8 more
We present optical and ultraviolet (UV) photometry and spectra of the very nearby and highly reddened supernova (SN) 2014J in M82 obtained with the Swift Ultra-Violet/Optical Telescope (UVOT). Comparison of the UVOT grism spectra of SN 2014J with Hubble Space Telescope observations of SN2011fe or UVOT grism spectra of SN 2012fr are consistent with…
Simultaneous observation of a hot explosion by NST and IRIS
Yurchyshyn, Vasyl; Lim, Eun-Kyung; Yang, Heesu +9 more
We present the first simultaneous observations of so-called “hot explosions” in the cool atmosphere of the Sun made by the New Solar Telescope (NST) of Big Bear Solar Observatory and the Interface Region Imaging Spectrograph (IRIS) in space. The data were obtained during the joint IRIS-NST observations on 2014 July 30. The explosion of interest st…
IRIS and SDO Observations of Recurrent Explosive Events
Gupta, G. R.; Tripathi, Durgesh
Observations of recurrent explosive events (EEs) with timescales of 3-5 minutes are reported. These EEs have been observed with the Interface Region Imaging Spectrograph (IRIS) and have a spatial dimension of ∼ 1\buildrel{\prime\prime}\over{.} 5 along the slit. The spectral line profiles of C ii 1335/1336 Å and Si iv 1394/1403 Å become highly broa…
Herschel Far-infrared Spectral-mapping of Orion BN/KL Outflows: Spatial Distribution of Excited CO, H2O, OH, O, and C+ in Shocked Gas
Cernicharo, José; Bergin, Edwin A.; Encrenaz, Pierre +8 more
We present ~2' × 2' spectral-maps of Orion Becklin-Neugebauer/Kleinmann-Low (BN/KL) outflows taken with Herschel at ~12'' resolution. For the first time in the far-IR domain, we spatially resolve the emission associated with the bright H2 shocked regions "Peak 1" and "Peak 2" from that of the hot core and ambient cloud. We analyze the ~…
Predicting the Redshift 2 Hα Luminosity Function Using [OIII] Emission Line Galaxies
Teplitz, Harry I.; Scarlata, Claudia; Henry, Alaina +12 more
Upcoming space-based surveys such as Euclid and WFIRST-AFTA plan to measure baryonic acoustic oscillations in order to study dark energy. These surveys will use IR slitless grism spectroscopy to measure redshifts of a large number of galaxies over a significant redshift range. In this paper, we use the Wide Field Camera 3 Infrared Spectroscopic Pa…
Probing the Physics of Narrow-line Regions in Active Galaxies. III. Accretion and Cocoon Shocks in the LINER NGC 1052
Jose, Jessy; Juneau, Stéphanie; Dopita, Michael A. +16 more
We present Wide Field Spectrograph integral field spectroscopy and Hubble Space Telescope Faint Object Spectrograph spectroscopy for the low-ionization nuclear emission line region (LINER) galaxy NGC 1052. We infer the presence of a turbulent accretion flow forming a small-scale accretion disk. We find a large-scale outflow and ionization cone alo…