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Gemini IFU, VLA, and HST observations of the OH Megamaser Galaxy IRAS17526 + 3253 ★.
- Source :
- Monthly Notices of the Royal Astronomical Society; Jul2019, Vol. 486 Issue 3, p3350-3367, 18p
- Publication Year :
- 2019
-
Abstract
- We present a multiwavelength study of the OH megamaser galaxy IRAS17526 + 3253, based on new Gemini multi-object spectrograph integral field unit (GMOS/IFU) observations, Hubble Space Telescope F814W, and H α + [N ii ] images, and archival 2MASS and 1.49 GHz VLA data. The Hubble Space Telescope (HST) images clearly reveal a mid-to-advanced stage major merger whose northwestern and southeastern nuclei have a projected separation of ∼8.5 kpc. Our HST /H α + [N ii ] image shows regions of ongoing star formation across the envelope on ∼10 kpc scales, which are aligned with radio features, supporting the interpretation that the radio emission originates from star-forming regions. The measured H α luminosities imply that the unobscured star formation rate (SFR) is ∼10–30 M<subscript>⊙</subscript> yr<superscript>−1</superscript>. The GMOS/IFU data reveal two structures in northwestern separated by 850 pc and by a discontinuity in the velocity field of ∼ 200 km s<superscript>−1</superscript>. We associate the blueshifted and redshifted components with, respectively, the distorted disc of northwestern and tidal debris, possibly a tail originating in southeastern. Star formation is the main ionization source in both components, which have SFRs of ∼2.6–7.9 M<subscript>⊙</subscript> yr<superscript>−1</superscript> and ∼1.5–4.5 M<subscript>⊙</subscript> yr<superscript>−1</superscript>, respectively. Fainter line emission bordering these main components is consistent with shock ionization at a velocity ∼200 km s<superscript>−1</superscript> and may be the result of an interaction between the tidal tail and the northwestern galaxy's disc. IRAS17526 + 3253 is one of only a few systems known to host both luminous OH and H<subscript>2</subscript>O masers. The velocities of the OH and H<subscript>2</subscript>O maser lines suggest that they are associated with the northwestern and southeastern galaxies, respectively (Martin et al.; Wagner). [ABSTRACT FROM AUTHOR]
- Subjects :
- STAR formation
SPACE telescopes
GALAXIES
DISK galaxies
MASERS
SEYFERT galaxies
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 486
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 136847900
- Full Text :
- https://doi.org/10.1093/mnras/stz196