Search Publications

Multiwavelength Analysis of a Nearby Heavily Obscured AGN in NGC 449

Fang, Guanwen; Gu, Qiusheng; Xu, Jun +5 more

We present the multiwavelength analysis of a heavily obscured active galactic nucleus (AGN) in NGC 449. We first constructed a broadband X-ray spectrum using the latest NuSTAR and XMM-Newton data. Its column density (≃10²⁴ cm^-2) and photon index (Γ ≃ 2.4) were reliably obtained by analyzing the broadband X-ray spectrum. Howev…

Infrared Emission Properties of Active Galactic Nuclei from Swift-BAT Hard X-Ray Survey

Yang, Xiao-Hong

The Swift/Burst Alert Telescope (BAT) 105-month survey detected 1632 hard X-ray sources in the 14-195 keV band, which includes 1105 active galactic nuclei (AGNs) that are unbiased against Compton-thin obscuration. We use a series of two-color diagrams to analyze the near, mid (MIR), and far-infrared properties of the Swift/BAT AGNs, based on data …

Pixel-based Spectral Characterization of Mid-infrared Si Array Detectors for Astronomical Observations in Space

Kaneda, Hidehiro; Ishihara, Daisuke; Wada, Takehiko +2 more

Mid-infrared (IR) array detectors have been used for astronomical observations in space. However, the uniformities of their spectral response curves have not been investigated in detail, the understanding of which is important for spectroscopic observations using large array formats. We characterize the spectral responses of all the pixels in IR a…

Near-infrared Spectra of a Sample of Galactic Unclassified B[e] Stars

Kraus, Michaela; Arias, María L.; Cidale, Lydia S. +4 more

B[e] stars are surrounded by cool and dense circumstellar environments where molecules and dust are formed. These stars are rare and display complex spectra whose photospheric features are frequently veiled by their circumstellar envelopes, making it difficult to assign them spectral types and evolutionary phases. On the basis of a detailed analys…

Abundance Analyses of the New R Coronae Borealis Stars: ASAS-RCB-8 and ASAS-RCB-10

Kamath, Devika; Pandey, Gajendra; Kameswara Rao, N. +3 more

Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair among the majority class of RCBs. ASAS-RCB-10 is one of the most N-poor majority RCBs with an above average O abundance. Rela…

High-Resolution Optical Spectroscopy of the R Coronae Borealis Star V532 Ophiuchi at Maximum Light

Lambert, David L.; Kameswara Rao, N.; Hema, B. P. +1 more

Not Available

Based on observations obtained with the Harlan J. Smith Telescope of McDonald Observatory of the University of Texas at Austin.

A Search for Mass Loss from Metal-Poor Field Red Giants using Data from the WISE and AKARI Satellites

Smith, Graeme H.; Bashay, Edward A.

The Star Formation Reference Survey. I. Survey Description and Basic Data

Sturm, E.; Barmby, P.; Zezas, A. +17 more

Star formation is arguably the most important physical process in the cosmos. It is a fundamental driver of galaxy evolution and the ultimate source of most of the energy emitted by galaxies in the local universe. A correct interpretation of star formation rate (SFR) measures is therefore essential to our understanding of galaxy formation and evol…

Characterization and Improvement of the Image Quality of the Data Taken with the Infrared Camera (IRC) Mid-Infrared Channels on Board AKARI

Oyabu, Shinki; Onaka, Takashi; Tanabé, Toshihiko +7 more

Mid-infrared images frequently suffer artifacts and extended point-spread functions (PSFs). We investigate the characteristics of the artifacts and the PSFs in images obtained with the infrared camera (IRC) on board AKARI at four mid-infrared bands of the S7 (7 µm), S11 (11 µm), L15 (15 µm), and L24 (24 µm). Removal of the …

AKARI-CAS—Online Service for AKARI All-Sky Catalogues

Oyabu, S.; Yamamura, I.; Ishihara, D. +10 more

The AKARI All-Sky Catalogues are an important infrared astronomical database for next-generation astronomy that take over the IRAS catalog. We have developed an online service, AKARI Catalogue Archive Server (AKARI-CAS), for astronomers. The service includes useful and attractive search tools and visual tools. One of the new features of AKARI-CAS …