Artículo de revista
Constraints on free–free emission from anomalous microwave emission sources in the perseus molecular cloud
Fecha
2013-06-20Registro en:
The Astrophysical Journal, 770:122 (8pp), 2013 June 20
doi:10.1088/0004-637X/770/2/122
Autor
Tibbs, C.
Paladini, R.
Dickinson, C.
Mason, B.S.
Casassus Montero, Simón
Cleary, K.
Davies, R.D.
Davis, R.J.
Watson, R.A.
Institución
Resumen
We present observations performed with the Green Bank Telescope at 1.4 and 5 GHz of three strips coincident with
the anomalous microwave emission features previously identified in the Perseus molecular cloud at 33 GHz with
the Very Small Array. With these observations we determine the level of the low frequency (∼1–5 GHz) emission.
We do not detect any significant extended emission in these regions and we compute conservative 3σ upper limits
on the fraction of free–free emission at 33 GHz of 27%, 12%, and 18% for the three strips, indicating that the level
of the emission at 1.4 and 5 GHz cannot account for the emission observed at 33 GHz. Additionally, we find that
the low frequency emission is not spatially correlated with the emission observed at 33 GHz. These results indicate
that the emission observed in the Perseus molecular cloud at 33 GHz, is indeed in excess over the low frequency
emission, hence confirming its anomalous nature.