English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Survey of gravitationally-lensed objects in HSC imaging (SuGOHI) - III. Statistical strong lensing constraints on the stellar IMF of CMASS galaxies

Sonnenfeld, A., Jaelani, A. T., Chan, J., More, A., Suyu, S. H., Wong, K. C., et al. (2019). Survey of gravitationally-lensed objects in HSC imaging (SuGOHI) - III. Statistical strong lensing constraints on the stellar IMF of CMASS galaxies. Astronomy and Astrophysics, 630: A71. doi:10.1051/0004-6361/201935743.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0004-D6CB-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-D6CC-5
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Sonnenfeld, Alessandro, Author
Jaelani, Anton T., Author
Chan, James, Author
More, Anupreeta, Author
Suyu, Sherry H.1, Author              
Wong, Kenneth C., Author
Oguri, Masamune, Author
Lee, Chien-Hsiu, Author
Affiliations:
1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

Content

show
hide
Free keywords: -
 Abstract: Context. The determination of the stellar initial mass function (IMF) of massive galaxies is one of the open problems in cosmology. Strong gravitational lensing is one of the few methods that allow us to constrain the IMF outside of the Local Group. Aims. The goal of this study is to statistically constrain the distribution in the IMF mismatch parameter, defined as the ratio between the true stellar mass of a galaxy and that inferred assuming a reference IMF, of massive galaxies from the Baryon Oscillation Spectroscopic Survey (BOSS) constant mass (CMASS) sample. Methods. We took 23 strong lenses drawn from the CMASS sample, measured their Einstein radii and stellar masses using multi-band photometry from the Hyper Suprime-Cam survey, then fitted a model distribution for the IMF mismatch parameter and dark matter halo mass to the whole sample. We used a prior on halo mass from weak lensing measurements and accounted for strong lensing selection effects in our model. Results. Assuming a Navarro Frenk and White density profile for the dark matter distribution, we infer a value μIMF = −0.04 ± 0.11 for the average base-10 logarithm of the IMF mismatch parameter, defined with respect to a Chabrier IMF. A Salpeter IMF is in tension with our measurements. Conclusions. Our results are consistent with a scenario in which the region of massive galaxies where the IMF normalisation is significantly heavier than that of the Milky Way is much smaller than the scales 5 − 10 kpc probed by the Einstein radius of the lenses in our sample, as recent spatially-resolved studies of the IMF in massive galaxies suggest.

Details

show
hide
Language(s):
 Dates: 2019-07-11
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1051/0004-6361/201935743
Other: LOCALID: 3169402
 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: France : EDP Sciences S A
Pages: - Volume / Issue: 630 Sequence Number: A71 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1