Contenuti
Immagini
Carica la tua immagine
DSS Images Other Images
Articoli relazionati
The Narrow-Line Region of the Seyfert 2 Galaxy Mrk 78: An Infrared View
We report near-infrared spectroscopic data for the Seyfert 2 galaxy Mrk78, taken with the LIRIS near-infrared camera/spectrometer at theWilliam Herschel Telescope (WHT). The long-slit spectra clearly showextended emission. The resolution and depth of the near-infrared spectraallow the examination of its morphology and ionization regions, and adirect comparison with similarly deep visible spectra. The emission-lineratios obtained are used to derive the extinction toward the nucleus.The detection of strong features such as [Fe II], H2,hydrogen recombination lines, and the coronal [Si VI] λ1.962 lineis used to study the kinematics and excitation mechanisms occurring inMrk 78, revealing that despite the strong radio-jet interaction presentin this object, photoionization from the active nucleus dominates thenarrow-line region emission, while UV fluorescence is the source of theH2 emission. Lines with extended emission yield velocitydistributions with an amplitude of about 600 km s-1, theconsequence of an eastern lobe moving away from us plus a western lobewith the opposite contribution. We used the photoionization code CLOUDYto recreate a typical narrow-line region, to derive the ionizationparameter, and to compare our spectral data with diagnostic diagrams.
|
Sottometti un nuovo articolo
Link relazionati
Sottometti un nuovo link
Membro dei seguenti gruppi:
|
Osservazione e dati astrometrici
| Costellazione: | Giraffa |
| Ascensione retta: | 07h43m15.48s |
| Declinazione: | +67°36'30.9" |
| Magnitudine apparente: | 9.023 |
| Moto proprio RA: | -4.9 |
| Moto proprio Dec: | -13.7 |
| B-T magnitude: | 9.176 |
| V-T magnitude: | 9.036 |
Cataloghi e designazioni:
|
