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Satellite accretion in action: a tidally disrupting dwarf spheroidal around the nearby spiral galaxy NGC 253
Aaron J. Romanowsky, D. Martinez-Delgado, Nicolas F. Martin +7
We report the discovery of NGC 253-dw2, a dwarf spheroidal (dSph) galaxy candidate undergoing tidal disruption around a nearby spiral galaxy, NGC 253 in the Sculptor group: the fir…
SP_Ace: a new code to derive stellar parameters and elemental abundances
C. Boeche, E. K. Grebel
Aims: We developed a new method of estimating the stellar parameters Teff, log g, [M/H], and elemental abundances. This method was implemented in a new code, SP_Ace (Stellar Parame…
Finding, characterizing and classifying variable sources in multi-epoch sky surveys: QSOs and RR Lyrae in PS1 3 data
Nina Hernitschek, Edward F. Schlafly, Branimir Sesar +14
In area and depth, the Pan-STARRS1 (PS1) 3 survey is unique among many-epoch, multi-band surveys and has enormous potential for all-sky identification of variable sources. PS1 h…
The grey extinction of the ionizing cluster in NGC 3603 from ultraviolet to optical wavelengths
Xiaoying Pang, Anna Pasquali, Eva K. Grebel
We use photometry in the F220W, F250W, F330W, F435W filters from the High Resolution Channel of the Advanced Camera for Surveys and photometry in the F555W, F675W, and F814W filter…
Hubble Tarantula Treasury Project. IV. The extinction law
Guido De Marchi, Nino Panagia, Elena Sabbi +10
We report on the study of interstellar extinction across the Tarantula nebula (30 Doradus), in the Large Magellanic Cloud, using observations from the Hubble Tarantula Treasury Pro…
On the central abundances of Active Galactic Nuclei and Star-forming Galaxies
O. L. Dors, M. V. Cardaci, G. F. Hagele +5
We examine the relation between oxygen abundances in the narrow-line regions (NLRs) of active galactic nuclei (AGNs) estimated from the optical emission lines through the strong-li…