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Title: SPATIALLY CORRELATED CLUSTER POPULATIONS IN THE OUTER DISK OF NGC 3184

Abstract

We use deep ({approx}27.5 mag V-band point-source limiting magnitude) V- and U-band Large Binocular Telescope imaging to study the outer disk (beyond the optical radius R {sub 25}) of the non-interacting, face-on spiral galaxy NGC 3184 (D = 11.1 Mpc; R {sub 25} = 11.1 kpc) and find that this outer disk contains >1000 objects (or marginally resolved 'knots') resembling star clusters with masses {approx}10{sup 2}-10{sup 4} M {sub sun} and ages up to {approx}1 Gyr. We find statistically significant numbers of these cluster-like knots extending to {approx}1.4 R {sub 25}, with the redder knots outnumbering bluer at the largest radii. We measure clustering among knots and find significant correlation to galactocentric radii of 1.5 R {sub 25} for knot separations <1 kpc. The effective integrated surface brightness of this outer disk cluster population ranges from 30-32 mag arcsec{sup -2} in V. We compare the H I extent to that of the correlated knots and find that the clusters extend at least to the damped Lyman-{alpha} threshold of H I column density (2 x 10{sup 20} cm{sup -2}; {approx}1.62 R {sub 25}). The blue knots are correlated with H I spiral structure to {approx}1.5 R {sub 25}, while the redmore » knots may be correlated with the outer fringes of the H I disk to {approx}1.7 R {sub 25}. These results suggest that outer disks are well populated, common, and long-lasting features of many nearby disk galaxies.« less

Authors:
;  [1];  [2];  [3];  [4]; ;  [5]; ; ;  [6];  [7];  [8]
  1. University of Arizona/Steward Observatory, 933 N Cherry Avenue, Tucson, AZ 85721 (United States)
  2. Center for Cosmology and Particle Physics, New York University, 4 Washington Place, New York, NY 10003 (United States)
  3. Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching (Germany)
  4. Department of Astronomy, University of Wisconsin-Madison, 475 N. Charter St., Madison, WI 53706 (United States)
  5. INAF, Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova (Italy)
  6. INAF, Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio (Italy)
  7. Department of Astronomy, The Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210-1173 (United States)
  8. INAF, Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, I-34131 Trieste (Italy)
Publication Date:
OSTI Identifier:
21313733
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 700; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/700/2/1977; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; BRIGHTNESS; GALAXIES; MASS; POINT SOURCES; STAR CLUSTERS; TELESCOPES

Citation Formats

Herbert-Fort, Stephane, Zaritsky, Dennis, Moustakas, John, Christlein, Daniel, Wilcots, Eric, Baruffolo, Andrea, Ragazzoni, Roberto, DiPaola, Andrea, Fontana, Adriano, Giallongo, Emanuele, Pogge, Richard W, and Smareglia, Riccardo. SPATIALLY CORRELATED CLUSTER POPULATIONS IN THE OUTER DISK OF NGC 3184. United States: N. p., 2009. Web. doi:10.1088/0004-637X/700/2/1977; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Herbert-Fort, Stephane, Zaritsky, Dennis, Moustakas, John, Christlein, Daniel, Wilcots, Eric, Baruffolo, Andrea, Ragazzoni, Roberto, DiPaola, Andrea, Fontana, Adriano, Giallongo, Emanuele, Pogge, Richard W, & Smareglia, Riccardo. SPATIALLY CORRELATED CLUSTER POPULATIONS IN THE OUTER DISK OF NGC 3184. United States. https://doi.org/10.1088/0004-637X/700/2/1977; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)
Herbert-Fort, Stephane, Zaritsky, Dennis, Moustakas, John, Christlein, Daniel, Wilcots, Eric, Baruffolo, Andrea, Ragazzoni, Roberto, DiPaola, Andrea, Fontana, Adriano, Giallongo, Emanuele, Pogge, Richard W, and Smareglia, Riccardo. 2009. "SPATIALLY CORRELATED CLUSTER POPULATIONS IN THE OUTER DISK OF NGC 3184". United States. https://doi.org/10.1088/0004-637X/700/2/1977; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21313733,
title = {SPATIALLY CORRELATED CLUSTER POPULATIONS IN THE OUTER DISK OF NGC 3184},
author = {Herbert-Fort, Stephane and Zaritsky, Dennis and Moustakas, John and Christlein, Daniel and Wilcots, Eric and Baruffolo, Andrea and Ragazzoni, Roberto and DiPaola, Andrea and Fontana, Adriano and Giallongo, Emanuele and Pogge, Richard W and Smareglia, Riccardo},
abstractNote = {We use deep ({approx}27.5 mag V-band point-source limiting magnitude) V- and U-band Large Binocular Telescope imaging to study the outer disk (beyond the optical radius R {sub 25}) of the non-interacting, face-on spiral galaxy NGC 3184 (D = 11.1 Mpc; R {sub 25} = 11.1 kpc) and find that this outer disk contains >1000 objects (or marginally resolved 'knots') resembling star clusters with masses {approx}10{sup 2}-10{sup 4} M {sub sun} and ages up to {approx}1 Gyr. We find statistically significant numbers of these cluster-like knots extending to {approx}1.4 R {sub 25}, with the redder knots outnumbering bluer at the largest radii. We measure clustering among knots and find significant correlation to galactocentric radii of 1.5 R {sub 25} for knot separations <1 kpc. The effective integrated surface brightness of this outer disk cluster population ranges from 30-32 mag arcsec{sup -2} in V. We compare the H I extent to that of the correlated knots and find that the clusters extend at least to the damped Lyman-{alpha} threshold of H I column density (2 x 10{sup 20} cm{sup -2}; {approx}1.62 R {sub 25}). The blue knots are correlated with H I spiral structure to {approx}1.5 R {sub 25}, while the red knots may be correlated with the outer fringes of the H I disk to {approx}1.7 R {sub 25}. These results suggest that outer disks are well populated, common, and long-lasting features of many nearby disk galaxies.},
doi = {10.1088/0004-637X/700/2/1977; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
url = {https://www.osti.gov/biblio/21313733}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 700,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 2009},
month = {Sat Aug 01 00:00:00 EDT 2009}
}