We present VLT long-slit optical spectroscopy of the luminous BL Lacertae object PKS 2005-489. The high signal-to-noise ratio and the good spatial resolution of the data allow us to detect the signatures of ongoing star formation in an extended rotating ring, at similar to 4 kpc from the nucleus. We find that the ring is almost perpendicular to the radio axis, and its total star formation rate is similar or equal to 1 M-circle dot yr(-1). We briefly discuss the concomitant presence of recent star formation and nuclear activity.
Ongoing star formation in the BL lacertae object PKS 2005-489 / Bressan, Alessandro; Falomo, R; Valdes, J. R.; Rampazzo, R.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 645:2(2006), pp. L101-L104. [10.1086/506326]
Ongoing star formation in the BL lacertae object PKS 2005-489
Bressan, Alessandro;
2006-01-01
Abstract
We present VLT long-slit optical spectroscopy of the luminous BL Lacertae object PKS 2005-489. The high signal-to-noise ratio and the good spatial resolution of the data allow us to detect the signatures of ongoing star formation in an extended rotating ring, at similar to 4 kpc from the nucleus. We find that the ring is almost perpendicular to the radio axis, and its total star formation rate is similar or equal to 1 M-circle dot yr(-1). We briefly discuss the concomitant presence of recent star formation and nuclear activity.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
