A high-resolution multiband survey of Westerlund 2 with the Hubble Space Telescope. III. The present-day stellar mass function
We present a detailed analysis of the spatial distribution of the stellar population and the present-day mass function (PDMF) of the Westerlund 2 (Wd2) region using the data from our high-resolution multiband survey with the Hubble Space Telescope . We used state-of-the-art artificial star tests to...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2017 February 21
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| In: |
The astronomical journal
Year: 2017, Jahrgang: 153, Heft: 3 |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/153/3/122 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.3847/1538-3881/153/3/122 Verlag, kostenfrei, Volltext: http://stacks.iop.org/1538-3881/153/i=3/a=122 
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| Verfasserangaben: | Peter Zeidler, Antonella Nota, Eva K. Grebel, Elena Sabbi, Anna Pasquali, Monica Tosi, and Carol Christian |
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| 100 | 1 | |a Zeidler, Peter |e VerfasserIn |0 (DE-588)1084237075 |0 (DE-627)848469747 |0 (DE-576)456250115 |4 aut | |
| 245 | 1 | 2 | |a A high-resolution multiband survey of Westerlund 2 with the Hubble Space Telescope. III. The present-day stellar mass function |c Peter Zeidler, Antonella Nota, Eva K. Grebel, Elena Sabbi, Anna Pasquali, Monica Tosi, and Carol Christian |
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| 520 | |a We present a detailed analysis of the spatial distribution of the stellar population and the present-day mass function (PDMF) of the Westerlund 2 (Wd2) region using the data from our high-resolution multiband survey with the Hubble Space Telescope . We used state-of-the-art artificial star tests to determine spatially resolved completeness maps for each of the broadband filters. We reach a level of completeness of 50% down to ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn1.gif] $F555W=24.8$ mag ( ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn2.gif] $0.7\,M_ødot $ ) and ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn3.gif] $F814W=23.3$ mag ( ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn4.gif] $0.2\,M_ødot $ ) in the optical and ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn5.gif] $F125W=20.2$ mag and ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn6.gif] $F160W=19.4$ mag (both ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn7.gif] $0.12\,M_ødot $ ) in the infrared throughout the field of view. We had previously reported that the core of Wd2 consists of two clumps: namely the main cluster and the northern clump. From the spatial distribution of the completeness-corrected population, we find that their stellar surface densities are ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn8.gif] $1114\,\mathrmstars\,\mathrmpc^-2$ and ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn9.gif] $555\,\mathrmstars\,\mathrmpc^-2$ , respectively, down to ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn10.gif] $F814W=21.8$ mag. We find that the PDMF of Wd2 has a slope of ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn11.gif] $\rm\Gamma =-1.46\pm 0.06$ , which translates to a total stellar cluster mass of ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn12.gif] $(3.6\pm 0.3)\cdot 10^4\,M_ødot $ . The spatial analysis of the PDMF reveals that the cluster population is mass-segregated and most likely primordial. In addition, we report the detection of a stellar population of spatially uniformly distributed low-mass ( ##IMG## [http://ej.iop.org/images/1538-3881/153/3/122/ajaa55c0ieqn13.gif] $\lt 0.15\,M_ødot $ ) stars, extending into the gas ridges of the surrounding gas and dust cloud, as well as a confined region of reddened stars, likely caused by a foreground CO cloud. We find hints that a cloud-cloud collision might be the origin of the formation of Wd2. | ||
| 700 | 1 | |a Grebel, Eva K. |d 1966- |e VerfasserIn |0 (DE-588)1020239085 |0 (DE-627)691153221 |0 (DE-576)359782833 |4 aut | |
| 700 | 1 | |a Pasquali, Anna |e VerfasserIn |0 (DE-588)1020310103 |0 (DE-627)691178895 |0 (DE-576)360125387 |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The astronomical journal |d Washington, DC : AAS Publishing, American Astronomical Society, 1998 |g 153(2017,3) Artikel-Nummer 122, 16 Seiten |w (DE-627)312175647 |w (DE-600)2003104-X |w (DE-576)090883306 |x 1538-3881 |7 nnas |a A high-resolution multiband survey of Westerlund 2 with the Hubble Space Telescope. III. The present-day stellar mass function |
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| 787 | 0 | 8 | |i Errata |a Zeidler, Peter |t Erratum: “A high-resolution multiband survey of Westerlund 2 with the Hubble Space Telescope |d 2020 |w (DE-627)1691510181 |
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