Universität zu Köln

Markakis, K., Eckart, A., Castro, N., Sanchez-Monger, A., Labadie, L., Nishiyama, S. ORCID: 0000-0002-9440-7172, Britzen, S. and Zensus, J. A. (2018). High-resolution Observations of Cen A: Yellow and Red Supergiants in a Region of Jet-induced Star Formation? Astrophys. J., 852 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present the analysis of near-infrared (NIR), adaptive optics Subaru and archived HST imaging data of a region near the northern middle lobe of the Centaurus A (Cen A) j et, at a distance of similar to 15 kpc northeast from the center of NGC5128. Low-pass filtering of the NIR images reveals a strong -> 3 sigma above the background mean-signal at the expected position of the brightest star in the equivalent HST field. Statistical analysis of the NIR background noise suggests that the probability to observe a >3 sigma signal at the same position, in three independent measurements due to stochastic background fluctuations alone is negligible (<= 10(-7)%) and, therefore, that this signal should reflect the detection of the NIR counterparts of the brightest HST star. An extensive photometric analysis of this star yields V - I, visual-NIR, and NIR colors expected from a yellow supergiant with an estimated age similar to 10(-3)(+4) Myr. Furthermore, the second and third brighter HST stars are, likely, also supergiants in Cen A, with estimated ages similar to 16(-3)(+6) Myr and similar to 25(-9)(+15) Myr, respectively. The ages of these three supergiants are in good agreement with the ages of the young massive stars that were previously found in the vicinity and are thought to have formed during the later phases of the jet-H I cloud interaction that appears to drive the star formation in the region for the past similar to 100 Myr.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Markakis, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Castro, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monger, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Labadie, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nishiyama, S. UNSPECIFIED orcid.org/0000-0002-9440-7172 UNSPECIFIED Britzen, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zensus, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-204763
DOI:	10.3847/1538-4357/aa9379
Journal or Publication Title:	Astrophys. J.
Volume:	852
Number:	1
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NORTHEAST RADIO LOBE; CENTAURUS-A EVIDENCE; NGC 5128; STELLAR POPULATIONS; LOCAL GROUP; MILKY-WAY; NGC-5128; GALAXY; SPECTROSCOPY; FILAMENTS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/20476