Search Publications
Star Formation and Evolution of Blister-type H II Region Sh2-112
Bhatt, B. C.; Dewangan, L. K.; Ojha, D. K. +4 more
We report the observational findings of the Sh2-112 H II region by using the multiwavelength data analysis ranging from optical to radio wavelengths. This region is powered by the massive O8V-type star BD +45 3216. The surface density distribution and minimum spanning tree analyses of the young stellar object (YSO) candidates in the region reveal …
Cross-correlation of Far-infrared Background Anisotropies and CMB Lensing from Herschel and Planck Satellites
Gong, Yan; Cooray, Asantha; Chen, Xuelei +3 more
The cosmic infrared background (CIB) anisotropies and cosmic microwave background (CMB) lensing are powerful measurements for exploring cosmological and astrophysical problems. In this work, we measure the autocorrelation power spectrum of the CIB anisotropies in the Herschel-SPIRE HerMES Large Mode Survey (HeLMS) field, and the cross-power spectr…
IRIS Observations of the Low-atmosphere Counterparts of Active Region Outflows
Polito, Vanessa; Testa, Paola; De Pontieu, Bart +2 more
Active region (AR) outflows have been studied in detail since the launch of Hinode/EIS and are believed to provide a possible source of mass and energy to the slow solar wind. In this work, we investigate the lower atmospheric counterpart of AR outflows using observations from the Interface Region Imaging Spectrograph (IRIS). We find that the IRIS…
Magnetic Reconnection Invoked by Sweeping of the CME-driven Fast-mode Shock
Lin, Jun; Wang, Jingxiu; Zhang, Yuzong +4 more
Coronal waves exist ubiquitously in the solar atmosphere. They are important not only because of their rich physics but also because they are essential candidates for triggering remote magnetic eruptions. However, the latter mechanism has never been directly confirmed. By revisiting the successive eruptions on 2012 March 7, fast-mode shocks are id…
Optical and Infrared Study of the Obscured B[e] Supergiant High-mass X-Ray Binary IGR J16318-4848
Chaty, Sylvain; Fortin, Francis; Sander, Andreas
The supergiant high-mass X-ray binary IGR J16318-4848 was the first source detected by the INTErnational Gamma-Ray Astrophysics Laboratory satellite in 2003 and distinguishes itself by its high intrinsic absorption and B[e] phenomenon. It is the perfect candidate to study both binary interaction and the environment of supergiant B[e] stars. This s…
A Systematic Study of Galactic Outflows via Fluorescence Emission: Implications for Their Size and Structure
Heckman, Timothy M.; Wang, Bingjie; Norman, Colin A. +1 more
Galactic outflows play a major role in the evolution of galaxies, but the underlying physical processes are poorly understood. This is mainly because we have little information about the outflow structure, especially on large scales. In this paper, we probe the structure of galactic outflows in low-z starbursts using a combination of ultraviolet s…
New Light on an Old Problem of the Cores of Solar Resonance Lines
Judge, Philip G.; Leenaarts, Jorrit; Kleint, Lucia +2 more
We reexamine a 50+ yr old problem of deep central reversals predicted for strong solar spectral lines, in contrast to the smaller reversals seen in observations. We examine data and calculations for the resonance lines of H I, Mg II, and Ca II, the self-reversed cores of which form in the upper chromosphere. Based on 3D simulations, as well as dat…
Unusual Galactic H II Regions at the Intersection of the Central Molecular Zone and the Far Dust Lane
Heywood, I.; Ginsburg, Adam; Glover, Simon C. O. +7 more
Sgr E is a massive star formation complex found toward the Galactic center that consists of numerous discrete, compact H II regions. It is located at the intersection between the central molecular zone (CMZ) and the far dust lane of the Galactic bar, similar to "hot spots" seen in external galaxies. Compared with other Galactic star formation comp…
Toward Early-type Eclipsing Binaries as Extragalactic Milestones. II. NLTE Spectral Analysis and Stellar Parameters of the Detached O-type System OGLE-LMC-ECL-06782 in the LMC
Kudritzki, Rolf-Peter; Urbaneja, Miguel A.; Gieren, Wolfgang +5 more
We combine the NLTE spectral analysis of the detached O-type eclipsing binary OGLE-LMC-ECL-06782 with the analysis of the radial velocity curve and light curve to measure an independent distance to the Large Magellanic Cloud (LMC). In our spectral analysis we study composite spectra of the system at quadrature and use the information from radial v…
The Three Young Nuclear Super Star Clusters in NGC 5253
Smith, Linda J.; Sabbi, Elena; Ryon, Jenna +1 more
The blue compact dwarf galaxy NGC 5253 hosts a very young central starburst. The center contains intense radio thermal emission from a massive ultracompact H II region (or supernebula) and two massive and very young super star clusters (SSCs), which are seen at optical and infrared wavelengths. The spatial correspondence between these three object…