IRS Spectroscopy of Collisional Ring Galaxies

Philip N. Appleton; Paulo Beirão; Lee Armus; Bernhard Brandl; Vassilis Charmandaris; Tom Jarrett; Steven D. (Scott) Lord; Barry Madore; Joseph Mazzarella; William Reach; Mark Seibert; Beverly J Smith; Curtis Struck

IRS Spectroscopy of Collisional Ring Galaxies

Philip N. Appleton
, Paulo Beirão
, Lee Armus
, Bernhard Brandl
, Vassilis Charmandaris
, Tom Jarrett
, Steven D. (Scott) Lord
, Barry Madore
, Joseph Mazzarella
, William Reach
, Mark Seibert
, Beverly J Smith
, Curtis Struck

Department of Physics and Astronomy

California Institute of Technology
Spitzer Science Center
Leiden University
SSC-Caltech
University of Crete
Forth
Observatoire de Meudon
Foundation for Research and Technology - Hellas
Cornell University
IPAC/Caltech
Observatories of the Carnegie Institution of Washington (OCIW)
Iowa State University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We present Spitzer IRS Mid-IR spectroscopy of a sub-set of collisional ring galaxies from a larger sample being observed with the imaging cameras on Spitzer, and in the UV with Galex. The paper will concentrate on three systems that have been studied in detail: Arp 143, LT 41 and NGC 985. In Arp 143 and LT 41 we investigate the variations in PAH strength with underlying UV/opt/IR continuum, and discuss the discovery of powerful molecular hydrogen emission from the nucleus and inter-ring region in Arp 143. In the X-ray luminous Seyfert I ring galaxy NGC 985, we present evidence for anomalously strong emission from the 16-20 micron PAH "plateau" as compared with the PAH feature at 11.2 microns. We suggest that the large ratio of this emission ( L(16-20)/L(11.2)= 5.5), the largest yet seen in any galaxy nucleus, is the result of shocks, perhaps relating to a circumnuclear wind colliding with infalling molecular material--as suggested by previous BIMA, ISO, UV absorption line and XMM observations. Strong molecular hydrogen emission is also seen which may also have an origin in shocks.

Original language	American English
Title of host publication	American Astronomical Society Meeting Abstracts
State	Published - Dec 2006

Access to Document

https://ui.adsabs.harvard.edu/abs/2006AAS...20921704A/abstract

Cite this

@inproceedings{6d7024565a2548a88e65b5282cce11cc,

title = "IRS Spectroscopy of Collisional Ring Galaxies",

abstract = "We present Spitzer IRS Mid-IR spectroscopy of a sub-set of collisional ring galaxies from a larger sample being observed with the imaging cameras on Spitzer, and in the UV with Galex. The paper will concentrate on three systems that have been studied in detail: Arp 143, LT 41 and NGC 985. In Arp 143 and LT 41 we investigate the variations in PAH strength with underlying UV/opt/IR continuum, and discuss the discovery of powerful molecular hydrogen emission from the nucleus and inter-ring region in Arp 143. In the X-ray luminous Seyfert I ring galaxy NGC 985, we present evidence for anomalously strong emission from the 16-20 micron PAH {"}plateau{"} as compared with the PAH feature at 11.2 microns. We suggest that the large ratio of this emission ( L(16-20)/L(11.2)= 5.5), the largest yet seen in any galaxy nucleus, is the result of shocks, perhaps relating to a circumnuclear wind colliding with infalling molecular material--as suggested by previous BIMA, ISO, UV absorption line and XMM observations. Strong molecular hydrogen emission is also seen which may also have an origin in shocks.",

author = "Appleton, \{Philip N.\} and Paulo Beir{\~a}o and Lee Armus and Bernhard Brandl and Vassilis Charmandaris and Tom Jarrett and Lord, \{Steven D. (Scott)\} and Barry Madore and Joseph Mazzarella and William Reach and Mark Seibert and Smith, \{Beverly J\} and Curtis Struck",

year = "2006",

month = dec,

language = "American English",

booktitle = "American Astronomical Society Meeting Abstracts",

}

TY - GEN

T1 - IRS Spectroscopy of Collisional Ring Galaxies

AU - Appleton, Philip N.

AU - Beirão, Paulo

AU - Armus, Lee

AU - Brandl, Bernhard

AU - Charmandaris, Vassilis

AU - Jarrett, Tom

AU - Lord, Steven D. (Scott)

AU - Madore, Barry

AU - Mazzarella, Joseph

AU - Reach, William

AU - Seibert, Mark

AU - Smith, Beverly J

AU - Struck, Curtis

PY - 2006/12

Y1 - 2006/12

N2 - We present Spitzer IRS Mid-IR spectroscopy of a sub-set of collisional ring galaxies from a larger sample being observed with the imaging cameras on Spitzer, and in the UV with Galex. The paper will concentrate on three systems that have been studied in detail: Arp 143, LT 41 and NGC 985. In Arp 143 and LT 41 we investigate the variations in PAH strength with underlying UV/opt/IR continuum, and discuss the discovery of powerful molecular hydrogen emission from the nucleus and inter-ring region in Arp 143. In the X-ray luminous Seyfert I ring galaxy NGC 985, we present evidence for anomalously strong emission from the 16-20 micron PAH "plateau" as compared with the PAH feature at 11.2 microns. We suggest that the large ratio of this emission ( L(16-20)/L(11.2)= 5.5), the largest yet seen in any galaxy nucleus, is the result of shocks, perhaps relating to a circumnuclear wind colliding with infalling molecular material--as suggested by previous BIMA, ISO, UV absorption line and XMM observations. Strong molecular hydrogen emission is also seen which may also have an origin in shocks.

AB - We present Spitzer IRS Mid-IR spectroscopy of a sub-set of collisional ring galaxies from a larger sample being observed with the imaging cameras on Spitzer, and in the UV with Galex. The paper will concentrate on three systems that have been studied in detail: Arp 143, LT 41 and NGC 985. In Arp 143 and LT 41 we investigate the variations in PAH strength with underlying UV/opt/IR continuum, and discuss the discovery of powerful molecular hydrogen emission from the nucleus and inter-ring region in Arp 143. In the X-ray luminous Seyfert I ring galaxy NGC 985, we present evidence for anomalously strong emission from the 16-20 micron PAH "plateau" as compared with the PAH feature at 11.2 microns. We suggest that the large ratio of this emission ( L(16-20)/L(11.2)= 5.5), the largest yet seen in any galaxy nucleus, is the result of shocks, perhaps relating to a circumnuclear wind colliding with infalling molecular material--as suggested by previous BIMA, ISO, UV absorption line and XMM observations. Strong molecular hydrogen emission is also seen which may also have an origin in shocks.

M3 - Conference contribution

BT - American Astronomical Society Meeting Abstracts

ER -