Science Archives Publication System

Sh2-138: physical environment around a small cluster of massive stars

DOI: 10.1093/mnras/stv2269 Bibcode: 2015MNRAS.454.4335B

Bhatt, B. C.; Dewangan, L. K.; Ojha, D. K. +4 more

We present a multiwavelength study of the Sh2-138, a Galactic compact H II region. The data comprise of optical and near-infrared (NIR) photometric and spectroscopic observations from the 2-m Himalayan Chandra Telescope, radio observations from the Giant Metrewave Radio Telescope (GMRT), and archival data covering radio through NIR wavelengths. A …

2015 • Monthly Notices of the Royal Astronomical Society

Herschel 23

The Role of the Ionosphere in Providing Plasma to the Terrestrial Magnetosphere—An Historical Overview

DOI: 10.1007/s11214-015-0168-5 Bibcode: 2015SSRv..192....5C

Chappell, Charles R.

Through the more than half century of space exploration, the perception and recognition of the fundamental role of the ionospheric plasma in populating the Earth's magnetosphere has evolved dramatically. A brief history of this evolution in thinking is presented. Both theory and measurements have unveiled a surprising new understanding of this imp…

2015 • Space Science Reviews

Cluster 23

NuSTAR and Multifrequency Study of the Two High-redshift Blazars S5 0836+710 and PKS 2149-306

DOI: 10.1088/0004-637X/807/2/167 Bibcode: 2015ApJ...807..167T

Covino, S.; Tagliaferri, G.; Ghisellini, G. +15 more

Powerful blazars are flat-spectrum radio quasars whose emission is dominated by a Compton component peaking between a few hundred keV and a few hundred MeV. We observed two bright blazars, PKS 2149-306 at redshift z = 2.345 and S5 0836+710 at z = 2.172, in the hard X-ray band with the Nuclear Spectroscopic Telescope Array satellite. Simultaneous s…

2015 • The Astrophysical Journal

INTEGRAL 23

Infrared and X-Ray Evidence of an AGN in the NGC 3256 Southern Nucleus

DOI: 10.1088/0004-637X/805/2/162 Bibcode: 2015ApJ...805..162O

Ohyama, Youichi; Terashima, Yuichi; Sakamoto, Kazushi

We investigate signs of an active galactic nucleus (AGN) in the luminous infrared (IR) galaxy NGC 3256 at both IR and X-ray wavelengths. NGC 3256 has double nuclei: the northern and southern (hereafter, N and S nuclei, respectively). We show that the Spitzer IRAC colors extracted at the S nucleus are AGN-like, and the Spitzer IRS spectrum is bluer…

2015 • The Astrophysical Journal

eHST 23

The CO₂ continuum absorption in the 1.10- and 1.18-µm windows on Venus from Maxwell Montes transits by SPICAV IR onboard Venus express

DOI: 10.1016/j.pss.2014.08.010 Bibcode: 2015P&SS..113...66F

Bertaux, Jean-Loup; Korablev, Oleg; Bézard, Bruno +2 more

One of the difficulties in modeling Venus' nightside atmospheric windows is the need to apply CO₂ continuum opacity due to collision-induced CO₂ bands and/or extreme far wings of strong allowed CO₂ bands. Characterizing the CO₂ continuum absorption at near-IR wavelengths as well as searching for a possib…

2015 • Planetary and Space Science

VenusExpress 23

New Extinction and Mass Estimates from Optical Photometry of the Very Low Mass Brown Dwarf Companion CT Chamaeleontis B with the Magellan AO System

DOI: 10.1088/0004-637X/801/1/4 Bibcode: 2015ApJ...801....4W

Barman, Travis S.; Close, Laird M.; Males, Jared R. +9 more

We used the Magellan adaptive optics system and its VisAO CCD camera to image the young low mass brown dwarf companion CT Chamaeleontis B for the first time at visible wavelengths. We detect it at r', i', z', and Y_S . With our new photometry and T _eff ~ 2500 K derived from the shape of its K-band spectrum, we find that CT Cha…

2015 • The Astrophysical Journal

eHST 23

A Multi-wavelength Mass Analysis of RCS2 J232727.6-020437, A ∼3 × 10¹⁵ M_⊙ Galaxy Cluster at z = 0.7

DOI: 10.1088/0004-637X/814/1/21 Bibcode: 2015ApJ...814...21S

Sharon, K.; Gladders, M. D.; Schrabback, T. +20 more

We present an initial study of the mass and evolutionary state of a massive and distant cluster, RCS2 J232727.6-020437. This cluster, at z = 0.6986, is the richest cluster discovered in the RCS2 project. The mass measurements presented in this paper are derived from all possible mass proxies: X-ray measurements, weak-lensing shear, strong lensing,…

2015 • The Astrophysical Journal

eHST 23

Simultaneous Estimation of Photometric Redshifts and SED Parameters: Improved Techniques and a Realistic Error Budget

DOI: 10.1088/0004-637X/804/1/8 Bibcode: 2015ApJ...804....8A

Gawiser, Eric; Acquaviva, Viviana; Raichoor, Anand

We seek to improve the accuracy of joint galaxy photometric redshift estimation and spectral energy distribution (SED) fitting. By simulating different sources of uncorrected systematic errors, we demonstrate that if the uncertainties in the photometric redshifts are estimated correctly, so are those on the other SED fitting parameters, such as st…

2015 • The Astrophysical Journal

eHST 23

Structure and Dynamics of the 2012 November 13/14 Eclipse White-light Corona

DOI: 10.1088/0004-637X/800/2/90 Bibcode: 2015ApJ...800...90P

Seaton, D. B.; Rušin, V.; Saniga, M. +9 more

Continuing our series of observations of coronal motion and dynamics over the solar-activity cycle, we observed from sites in Queensland, Australia, during the 2012 November 13 (UT)/14 (local time) total solar eclipse. The corona took the low-ellipticity shape typical of solar maximum (flattening index ɛ = 0.01), a change from the composite corona…

2015 • The Astrophysical Journal

PROBA-2 SOHO 23

5.9-keV Mn K-shell X-ray luminosity from the decay of ⁵⁵Fe in Type Ia supernova models

DOI: 10.1093/mnras/stu2537 Bibcode: 2015MNRAS.447.1484S

Wilms, J.; Diehl, R.; Sim, S. A. +12 more

We show that the X-ray line flux of the Mn Kα line at 5.9 keV from the decay of ⁵⁵Fe is a promising diagnostic to distinguish between Type Ia supernova (SN Ia) explosion models. Using radiation transport calculations, we compute the line flux for two three-dimensional explosion models: a near-Chandrasekhar mass delayed detonation and a …

2015 • Monthly Notices of the Royal Astronomical Society

XMM-Newton 23