Dust and SSP-stellar parameters of M82 Virtual Observatory Resource

Authors
  1. Hutton S.
  2. Ferreras I.
  3. Yershov V.
  4. Published by
    CDS
Abstract

We use near ultraviolet and optical photometry to investigate the dust properties in the nearby starburst galaxy M82. By combining imaging from the Swift/UVOT instrument and optical data from the Sloan Digital Sky Survey, we derive the extinction curve parametrized by the standard R_V_ factor, and the strength of the NUV 2175 {AA} feature - quantified by a parameter B - out to projected galactocentric distances of 4 kpc. Our analysis is robust against possible degeneracies from the properties of the underlying stellar populations. Both B and R_V_ correlate with galactocentric distance, revealing a systematic trend of the dust properties. Our results confirm previous findings that dust in M82 is better fitted by a Milky Way standard extinction curve, in contrast to a Calzetti law. We find a strong correlation between R_V_ and B, towards a stronger NUV bump in regions with higher R_V_, possibly reflecting a distribution with larger dust grain sizes. The data we use were taken before SN2014J, and therefore can be used to probe the properties of the interstellar medium before the event. Our R_V_ values around the position of the supernova are significantly higher than recent measurements post-SN2014J (R_V_~1.4). This result is consistent with a significant change in the dust properties after the supernova event, either from disruption of large grains or from the contribution by an intrinsic circumstellar component. Intrinsic variations among supernovae not accounted for could also give rise to this mismatch.

Keywords
  1. Galaxies
  2. Interstellar medium
  3. Stellar populations
  4. Extinction
  5. Stellar ages
  6. Ultraviolet photometry
Bibliographic source Bibcode
2015MNRAS.452.1412H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/452/1412
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/452/1412

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/452/1412
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/452/1412
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/452/1412
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/452/1412/table3?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/452/1412/table3?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/452/1412/table3?

History

2018-01-10T12:25:21Z
Resource record created
2018-01-10T12:25:21Z
Created
2018-02-08T09:39:11Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr