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An Ultraviolet Spectrum of the Tidal Disruption Flare ASASSN-14li | | S. Bradley Cenko
; Antonino Cucchiara
; Nathaniel Roth
; Sylvain Veilleux
; J. Xavier Prochaska
; Lin Yan
; James Guillochon
; W. Peter Maksym
; Iair Arcavi
; Nathaniel R. Butler
; Alexei V. Filippenko
; Andrew S. Fruchter
; Suvi Gezari
; Daniel Kasen
; Andrew J. Levan
; Jon M. Miller
; Dheeraj R. Pasham
; Enrico Ramirez-Ruiz
; Linda E. Strubbe
; Nial R. Tanvir
; Francesco Tombesi
; | | Date: |
13 Jan 2016 | | Abstract: | We present a Hubble Space Telescope STIS spectrum of ASASSN-14li, the first
rest-frame UV spectrum of a tidal disruption flare (TDF). The underlying
continuum is well fit by a blackbody with $T_{mathrm{UV}} = 3.5 imes 10^{4}$
K, an order of magnitude smaller than the temperature inferred from X-ray
spectra (and significantly more precise than previous efforts based on optical
and near-UV photometry). Super-imposed on this blue continuum, we detect three
classes of features: narrow absorption from the Milky Way (probably a
High-Velocity Cloud), and narrow absorption and broad (FWHM $approx 2000$-8000
km s$^{-1}$) emission lines at/near the systemic host velocity. The absorption
lines are blueshifted with respect to the emission lines by $Delta v =
-(250$-400) km s$^{-1}$. Together with the lack of common low-ionization
features (Mg II, Fe II), we argue these arise from the same absorbing material
responsible for the low-velocity outflow discovered at X-ray wavelengths. The
broad nuclear emission lines display a remarkable abundance pattern: N III], N
IV], He II are quite prominent, while the common quasar emission lines of C
III] and Mg II are weak or entirely absent. Detailed modeling of this spectrum
will help elucidate fundamental questions regarding the nature of the emission
process(es) at work in TDFs, while future UV spectroscopy of ASASSN-14li would
help to confirm (or refute) the previously proposed connection between TDFs and
"N-rich" quasars. | | Source: | arXiv, 1601.3331 | | Services: | Forum | Review | PDF | Favorites | |
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