HST Survey of the Mid-UV Morphology of Nearby Galaxies
Windhorst, R. A., Taylor, V. A., Jansen, R. A., Odewahn, S. C., Chiarenza,
C. A., Conselice, C., de Grijs, R., de Jong, R. S., MacKenty, J., Eskridge, P.
B., Frogel, J. A., Gallagher III, J. S., Hibbard, J., Matthews, L., &
O'Connell, R. W.
2002, ApJS, 143, 113
Fig: NGC6782: (left) F255W, (middle) F300W, (right) F814W
ABSTRACT:
We present a systematic imaging survey of 37 nearby galaxies observed
with the Hubble Space Telescope (HST) Wide Field and Planetary
Camera 2 (WFPC2) in the mid-UV F300W filter, centered at 2930A, as
well as in the I-band (F814W) filter at 8230A. Eleven of these
galaxies were also imaged in the F255W filter, centered at 2550A.
Our sample is carefully selected to include galaxies of sufficiently
small radius and high predicted mid-UV surface brightness to be
detectable with WFPC2 in one orbit, and covers a wide range of Hubble
types and inclinations. The mid-UV (2000-3200A) spans the gap
between ground-based UBVR(IJHK) images, which are available
or were acquired for the current study, and far-UV images available
from the Astro/UIT missions for 15 galaxies in our sample.
The first qualitative results from our study are:
(1) Early-type galaxies show a significant decrease in surface
brightness going from the red to the mid-UV, reflecting the absence of a
dominant young stellar population, and in some cases the presence of
significant (central) dust lanes. Galaxies that are early-types in the
optical show a variety of morphologies in the mid-UV that can lead to a
different morphological classification, although not necessarily as
later-type. Some early-type galaxies become dominated by a blue
nuclear feature or a point source in the mid-UV, e.g., due to the
presence of a Seyfert nucleus or a LINER. This is in part due to our
mid-UV surface brightness selection, but it also suggests that part of
the strong apparent evolution of weak AGN in early-type galaxies may be
due to surface brightness dimming of their UV-faint stellar population,
which renders the early-type host galaxies invisible at intermediate to
higher redshifts.
(2) About half of the mid-type spiral and star-forming galaxies appear
as a later morphological type in the mid-UV, as ASTRO/UIT also found
primarily in the far-UV. Sometimes these differences are dramatic (e.g.,
NGC6782 shows a spectacular ring of hot stars in the mid-UV). However,
not all mid-type spiral galaxies look significantly different in the
mid-UV. Their mid-UV images show a considerable range in the scale and
surface brightness of individual star-forming regions. Almost without
exception, the mid-type spirals in our sample have their small bulges
bisected by a dust-lane, which often appears to be connected to the
inner spiral arm structure.
(3) The majority of the heterogeneous subset of late-type, irregular,
peculiar and merging galaxies display F300W morphologies that are
similar to those seen in F814W, but with important differences due to
recognizable dust-features absorbing the bluer light, and due to hot
stars, star-clusters, and star-formation "ridges" that are bright in
the mid-UV. Less than one third of the galaxies classified as late-type
in the optical appears sufficiently different in the mid-UV to result in
a different classification.
Our HST mid-UV survey of nearby galaxies shows that -- when observed
in the rest-frame mid-UV -- early- to mid-type galaxies are more likely
to be misclassified as later types than late-type galaxies are to be
misclassified as earlier types. This is because the later type galaxies
are dominated by the same young and hot stars in all filters from the
mid-UV to the red, and so have a smaller "morphological K-correction"
than true earlier type galaxies. The morphological K-correction can
thus explain part, but certainly not all of the excess faint blue
late-type galaxies seen in deep HST fields.
Links to project pages:
- Published paper:
-
the MUV Cycle 09 publication page
- pdf file from ApJSS (6.3MB)
-
ApJS link
-
ADS link
- astro-ph/0204398
-
NED Level 5
- See also: "UBVR and HST mid-UV and Near-IR Surface
Photometry and Radial Color Gradients of Late-type, Irregular,
and Peculiar Galaxies"
Taylor, V.A., Jansen, R.A., Windhorst, R.A., Odewahn, S.C. & Hibbard
J.E., ApJ, 10 September 2005, v630 2 issue.
(astro-ph/0506122),
(full
resolution version)
-
Public HST Uband collaboration webpage (includes info on
all aspects of Cycle 9 & 10 programs; data will eventually be
archived here)
-
Steve Odewahns MUV survey page
- Cycle 9:
- Cycle 10:
-
Internal HST Uband collaboration webpage (password protected)
Figures from paper:
Links to jpgs of Figures 3.xx (F300W & F814W; F255W if present):
- figure 3a: CGCG 097-094; NGC 1398
- figure 3b: NGC 4478
- figure 3c: NGC 3516; UGC 3426 (Mrk 3)
- figure 3d:
UGC 08823 (Mrk279); NGC 3921 (Arp 224, Mrk 430)
- figure 3e: UGC 05101; UGC 08696 (Mrk 273)
- figure 3f: NGC 2551
- figure 3g: NGC 6753
- figure 3h: NGC 7769
- figure 3i: NGC 3310 (Arp 217)
- figure 3j: NGC 7685
- figure 3k: NGC 6782
- figure 3l: UGC 10043; UGC 06697
- figure 3m: IC 3949
- figure 3n: ESO 033-G022; IC 4393
- figure 3o: MCG+03-30-071; MCG+06-24-047
- figure 3p: UGC 05028/9 (Arp 200, Mrk 111)
- figure 3q: NGC 3860B; ESO 418-G008
- figure 3r: NGC 1510
- figure 3s: NGC 5253; NGC 1140 (Mrk 1063)
- figure 3t: UGC 05626
- figure 3u: UGC 09855; NGC 6789
- figure 3v: Mrk 66; UGC 05189
- figure 3w: NGC 3690/IC 694 (Arp 299)
- figure 3x:
UGC 06527 (Arp 322, Mrk 176); UGC 08335 (Arp 238)
- figure 3y:
IC 2184 (Mrk 8); NGC 5278/9 (Arp 239, Mrk 271)
Links to jpgs of Figures 4.xx (All Available Bands):
- figure 4a: CGCG 097-094
- figure 4b: NGC 1398
- figure 4c: NGC 4478
- figure 4d: NGC 3516
- figure 4e: UGC 3426 (Mrk 3)
- figure 4f: UGC 08823 (Mrk279)
- figure 4g: NGC 3921 (Arp 224, Mrk 430)
- figure 4h: UGC 05101
- figure 4i: UGC 08696 (Mrk 273)
- figure 4j: NGC 2551
- figure 4k: NGC 6753
- figure 4l: NGC 7769
- figure 4m: NGC 3310 (Arp 217)
- figure 4n: NGC 7685
- figure 4o: NGC 6782
- figure 4p: UGC 10043
- figure 4q: UGC 06697
- figure 4r: IC 3949
- figure 4s: ESO 033-G022
- figure 4t: IC 4393
- figure 4u: MCG+03-30-071
- figure 4v: MCG+06-24-047
- figure 4w: UGC 05028/9 (Arp 200, Mrk 111)
- figure 4x: NGC 3860B
- figure 4y: ESO 418-G008
- figure 4z: NGC 1510
- figure 4aa: NGC 5253
- figure 4bb: NGC 1140 (Mrk 1063)
- figure 4cc: UGC 05626
- figure 4dd: UGC 09855
- figure 4ee: NGC 6789
- figure 4ff: Mrk 66
- figure 4gg: UGC 05189
- figure 4hh: NGC 3690/IC 694 (Arp 299)
- figure 4ii: UGC 06527 (Arp 322, Mrk 176)
- figure 4jj: UGC 08335 (Arp 238)
- figure 4kk: IC 2184 (Mrk 8)
- figure 4ll: NGC 5278/9 (Arp 239, Mrk 271)
Links arranged by galaxy name (uses older Figures 3.xx and Figures 4.xx):
- HTML page showing All Figs 3.xx
- HTML page showing All Figs 4.xx
- MCG+03-30-71: figure.3.01,
figure.4.01
- NGC1396: figure.3.02,
figure.4.02
- NGC4478: figure.3.03,
figure.4.03
- NGC3516: figure.3.04,
figure.4.04a,
figure.4.04b
- UGC08823: figure.3.05,
figure.4.05
- UGC03426: figure.3.06,
figure.4.06
- NGC3921:
figure.3.07
- UGC05101: figure.3.08,
figure.4.08a,
figure.4.08b
- MRK273:
figure.3.09,
figure.4.09
- NGC2551: figure.3.10,
figure.4.10
- NGC6753: figure.3.11a,
figure.3.11b,
figure.4.11
- NGC7769:
figure.3.12a,
figure.3.12b,
figure.4.12a
- NGC3310: figure.3.13a,
figure.3.13b,
figure.4.13
- UGC12638: figure.3.14,
figure.4.14
- NGC6782: figure.3.15a,
figure.3.15b
- UGC10043: figure.3.16,
figure.4.16
- UGC06697: figure.3.17,
figure.4.17
- UGC08096: figure.3.18a,
figure.3.18b,
figure.4.18
- ESO033-G22: figure.3.19,
figure.4.19
- ESO446-G44: figure.3.20,
figure.4.20
- CGCG97-114: figure.3.21,
figure.4.21
- MCG+06-24-47: figure.3.22,
figure.4.22
- UGC05028: figure.3.23a,
figure.3.23b
- ESO418-008: figure.3.24,
figure.4.24
- UGC05626: figure.3.25,
figure.4.25a,
figure.4.25b
- NGC5253: figure.3.26,
figure.4.26
- NGC1140: figure.3.27,
figure.4.27
- NGC1510: figure.3.28
- UGC09855: figure.3.29,
figure.4.29
- NGC6789: figure.3.30
figure.4.30a,
figure.4.30b
- MRK66: figure.3.31,
figure.4.31
- UGC05189: figure.3.32a,
figure.3.32b,
figure.4.32
- MRK8: figure.3.33
figure.4.33a,
figure.4.33b
- ARP299:
figure.3.34a,
figure.3.34b,
figure.4.34
- UGC06527: figure.3.35,
figure.4.35
- UGC08335: figure.3.36,
figure.4.36
- UGC08677-8.g: figure.3.37,
figure.4.37
Last modified: Thu Aug 11 15:08:30 EDT 2005
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