English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  The distribution of stars around the Milky Way's central black hole II: Diffuse light from sub-giants and dwarfs

Schödel, R., Gallego-Cano, E., Dong, H., Nogueras-Lara, F., Gallego-Calvente, A. T., Amaro-Seoane, P., et al. (2018). The distribution of stars around the Milky Way's central black hole II: Diffuse light from sub-giants and dwarfs. Astronomy and Astrophysics, 609: A27. doi:10.1051/0004-6361/201730452.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0004-3A77-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-3A78-5
Genre: Journal Article

Files

show Files
hide Files
:
1701.03817.pdf (Preprint), 8MB
Name:
1701.03817.pdf
Description:
File downloaded from arXiv at 2019-07-11 09:30
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
:
aa30452-17.pdf (Publisher version), 8MB
Name:
aa30452-17.pdf
Description:
Free Access
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Schödel, R., Author
Gallego-Cano, E., Author
Dong, H., Author
Nogueras-Lara, F., Author
Gallego-Calvente, A. T., Author
Amaro-Seoane, Pau1, Author              
Baumgardt , H., Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

Content

show
hide
Free keywords: Astrophysics, Galaxy Astrophysics, astro-ph.GA
 Abstract: This is the second of three papers that search for the predicted stellar cusp around the Milky Way's central black hole, Sagittarius A*, with new data and methods. We aim to infer the distribution of the faintest stellar population currently accessible through observations around Sagittarius A*. We use adaptive optics assisted high angular resolution images obtained with the NACO instrument at the ESO VLT. Through optimised PSF fitting we remove the light from all detected stars above a given magnitude limit. Subsequently we analyse the remaining, diffuse light density. The analysed diffuse light arises from sub-giant and main-sequence stars with KS ~ 19 - 20 with masses of 1 - 2 Msol . These stars can be old enough to be dynamically relaxed. The observed power-law profile and its slope are consistent with the existence of a relaxed stellar cusp around the Milky Way's central black hole. We find that a Nuker law provides an adequate description of the nuclear cluster's intrinsic shape (assuming spherical symmetry). The 3D power-law slope near Sgr A* is \gamma = 1.23 +- 0.05. At a distance of 0.01 pc from the black hole, we estimate a stellar mass density of 2.3 +- 0.3 x 10^7 Msol pc^-3 and a total enclosed stellar mass of 180 +- 20 Msol. These estimates assume a constant mass-to-light ratio and do not take stellar remnants into account. The fact that no cusp is observed for bright (Ks 16) giant stars at projected distances of roughly 0.1-0.3 pc implies that some mechanism has altered their appearance or distribution.

Details

show
hide
Language(s):
 Dates: 2017-01-132017-11-272018
 Publication Status: Published in print
 Pages: Accepted for publication A&A
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1701.03817
DOI: 10.1051/0004-6361/201730452
URI: http://arxiv.org/abs/1701.03817
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 609 Sequence Number: A27 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1