Celestial Atlas
Spitzer Survey of Stellar Structure in Galaxies
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Page created July 25, 2021; last updated Aug 2, 2021

Purpose Of This Page:
 As discussed on the page about Gérard de Vaucouleurs' Atlas of Galaxies, de Vaucouleurs developed an extension of the Hubble classification of galaxy types involving a "three-dimensional" classification grid extending from ellipticals at one end to irregulars at the other. In 2015, Ron Buta (who maintains the website linked to images on my deVaucouleurs page) and a number of other specialists in the field used the Spitzer space telescope S4G survey by Salo et al. to develop a detailed extension of the original deVaucouleurs classification scheme, publishing a paper (A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies) discussing the extension and numerous examples of its use in detail, based on Salo's paper and Oulo's online database for the 2352 galaxies in the Survey (there was an implication that other galaxies might eventually be added to the catalog, but six years have passed without any apparent changes). The page you are reading, like the "MAIN" page for that database, will include a list of all those galaxies, but instead of linking to their entry in the Oulo database, the links below are to their entries on this website, which are in my NGC/IC catalog if they are NGC/IC objects, or in my PGC catalog if they are not NGC/IC objects (to maintain a structure similar to that of the Oulo database, their ESO/PGC/UGC entries will be listed as in that database; but all ESO and UGC entries will link to PGC entries on my site, with appropriate cross-references).
 As should be obvious, there are nowhere near 2000+ entries on this page, so it will be quite a while before it is done; but all links posted so far lead somewhere (though for the individual entries shown below, only a basic placeholder for now: designations, magnitude, the infrared CVRHS classification, constellation and position, a link to their S4G database entry, and a 12 arcmin wide image centered on the galaxy), and I will be adding at least a few more links and entries on a daily basis until the page is complete.

Advantages and Disadvantages of Infrared Classifications
 The infrared images taken by the Spitzer space telescope have the advantage that unlike visible light, which is easily blocked by interstellar dust, infrared radiation mostly passes right through the dust, because its longer wavelength makes the scattering and absorption by microscopic dust particles much less likely to occur (this is the same thing that makes the sky blue; shorter wavelengths of light are more easily scattered by air molecules, and since those wavelengths look blue or blue-violet, the scattered light by which we see the "sky" is what we call "blue"). This means that particularly in the case of "edge-on" galaxies, where dust lanes can completely block our view of the central regions, infrared images can make it possible to study those regions in far better detail. However, some things that are easy to see in visible light do not show up as well in the infrared, so classifications of galaxies using only infrared light can be very different from what one would expect when viewing visible-light images of those same galaxies.
 For that reason, although the CVRHS classifications in Buta et al.'s paper allow for far more detailed descriptions of what a galaxy looks like, the ones provided by the Spitzer Survey S4G database have to be compared to visible-light photographs and classifications to give a complete and proper description of galaxy "types". In setting up this page and the thousands of entries that will be linked from it, the problems caused by the possible divergence of visible-light and infrared classifications will mostly be ignored at first, to allow for more timely completion of this part of the project. But particularly for the NGC/IC objects, and eventually for all the objects in this list, I will be using not only the Spitzer Survey classifications, but also classifications obtained from other references and, where adequate images are available, the images themselves, to try to provide a more accurate description not only of the internal structure revealed by the infrared images, but also the structure that seems appropriate when using visible light to study the galaxies.

List of entries in the Spitzer Survey of Stellar Structure in Galaxies
ESO 011-005 ESO 012-010 ESO 012-014 ESO 013-016 ESO 015-001 ESO 026-001 ESO 027-001 ESO 027-008 ESO 048-017
ESO 054-021 ESO 079-003 ESO 079-005 ESO 079-007 ESO 085-014 ESO 085-030 ESO 085-047 ESO 107-016 ESO 114-007
ESO 115-021 ESO 116-012 ESO 119-016 ESO 120-012 ESO 120-021 ESO 145-025 ESO 146-014 ESO 149-001 ESO 149-003
ESO 150-005 ESO 154-023 ESO 157-049 ESO 159-025 ESO 187-035 ESO 187-051 ESO 202-035 ESO 202-041 ESO 234-043
ESO 234-049 ESO 236-039 ESO 237-049 ESO 237-052 ESO 238-018 ESO 240-004 ESO 240-011 ESO 245-005 ESO 245-007
ESO 248-002 ESO 249-008 ESO 249-026 ESO 249-027 ESO 249-035 ESO 249-036 ESO 285-048 ESO 286-044 ESO 287-009
ESO 287-037 ESO 287-043 ESO 288-013 ESO 289-010 ESO 289-026 ESO 289-048 ESO 291-024 ESO 292-014 ESO 293-034
ESO 293-045 ESO 298-015 ESO 298-023 ESO 300-014 ESO 302-009 ESO 302-014 ESO 302-021 ESO 305-009 ESO 305-017
ESO 340-008 ESO 340-009 ESO 340-017 ESO 340-042 ESO 341-032 ESO 342-013 ESO 342-050 ESO 345-046 ESO 346-001
ESO 346-014#81 Sd spw ESO 347-008#82 SAB(s)m ESO 347-017#83 dIm ESO 347-029#84 SAB(s)c: ESO 355-026#85 SA(r)bc ESO 356-018#86 Sm: sp ESO 357-007#87 SAB(s)m sp ESO 357-012#88 SAB(s)dm ESO 357-025#89 dE/S0: / Sph
ESO 358-005#90 S/IAm ESO 358-015#91 SA(s)m pec ESO 358-020#92 S/IAB(s)m (cc) ESO 358-025#93 SA(l,r)0+[d] / Sph ESO 358-051#94 Im pec / Sph ESO 358-054#95 SAB(s)m ESO 358-060#96 dIm sp ESO 358-063#97 SA(s)c sp / E(b)7-8 ESO 359-003#98 SBm sp
ESO 359-022#99 dIm ESO 359-029#100 dIm (dE/S0) / Sph ESO 359-031#101 IABm ESO 361-009#102 dIm ESO 361-015#103 SAB(s)dm ESO 361-019#104 Im (cc) ESO 362-009#105 SA(s)dm ESO 362-011#106 Sbc spw ESO 362-019#107 (R')SAB(s)dm
ESO #108 ESO #109 ESO #110 ESO #111 ESO #112 ESO #113 ESO #114 ESO #115 ESO #116
ESO #117 ESO #118 ESO #119 ESO #120 ESO #121 ESO #122 ESO #123 ESO #124 ESO #125
ESO #126 ESO #127 ESO #128 ESO #129 ESO #130 ESO #131 ESO #132 ESO #133 ESO #134
ESO #135 ESO #136 ESO #137 ESO #138 ESO #139 ESO #140 ESO #141 ESO #142 ESO #143
ESO #144 ESO #145 ESO #146 ESO #147 ESO #148 ESO #149 ESO #150 ESO #151 ESO #152
ESO #153 ESO #154 ESO #155 ESO #156 ESO #157 ESO #158 ESO #159 ESO #160 ESO #161
ESO #162 ESO #163 ESO #164 ESO #165 ESO #166 ESO #167 ESO #168 ESO #169 ESO #170
ESO #171 ESO #172 ESO #173 ESO #174 ESO #175 ESO #176 ESO #177 ESO #178 ESO #179
ESO #180 ESO #181 ESO #182 ESO #183 ESO #184 ESO #185 ESO #186 ESO #187 ESO #188
ESO #189 ESO #190 ESO #191 ESO #192 ESO #193 ESO #194 ESO #195 ESO #196 ESO #197
ESO #198 ESO #199 ESO #200 ESO #201 ESO #202 ESO #203 ESO #204 ESO #205 ESO #206
ESO #207 ESO #208 ESO #209 ESO #210 ESO #211 ESO #212 ESO #213 ESO #214 ESO #215
ESO #216 ESO #217 ESO #218 ESO #219 ESO #220 ESO #221 ESO #222 ESO #223 ESO #224
ESO #225 ESO #226 ESO #227 ESO #228 ESO #229 ESO #230 ESO #231 ESO #232 ESO #233
ESO #234 ESO #235 ESO #236 ESO #237 ESO #238 ESO #239 ESO #240 ESO #241 ESO #242
ESO #243 ESO #244 ESO #245 ESO #246 ESO #247 ESO #248 ESO #249 ESO #250 ESO #251
ESO #252 ESO #253 ESO #254 ESO #255 ESO #256 ESO #257 ESO #258 ESO #259 ESO #260
ESO #261 ESO #262 ESO #263 ESO #264 ESO #265 ESO #266 ESO #267 ESO #268 ESO #269
ESO #270 ESO #271 ESO #272 ESO #273 ESO #274 ESO #275 ESO #276 ESO #277 ESO #278
ESO #279 ESO #280 ESO #281 ESO #282 ESO #283 ESO #284 ESO #285 ESO #286 ESO #287
ESO #288 ESO #289 ESO #290 ESO #291 ESO #292 ESO #293 ESO #294 ESO #295 ESO #296
ESO #297

IC 51 IC 101 IC 163 IC 167 IC 210#302 SB(s)dm sp IC 217#303 Sdm sp IC 223#304 IABm IC 335#305 S0-[c] sp / E(d)7 IC 529#306 SAB(s)cd
IC #307 IC #308 IC #309 IC #310 IC #311 IC #312 IC #313 IC #314 IC #315
IC #316 IC #317 IC #318 IC #319 IC #320 IC #321 IC #322 IC #323 IC #324
IC #325 IC #326 IC #327 IC #328 IC #329 IC #330 IC #331 IC #332 IC #333
IC #334 IC #335 IC #336 IC #337 IC #338 IC #339 IC #340 IC #341 IC #342
IC #343 IC #344 IC #345 IC #346 IC #347 IC #348 IC #349 IC #350 IC #351
IC #352 IC #353 IC #354 IC #355 IC #356 IC #357 IC 1954#358 SB(rs)cd IC #359 IC #360
IC # IC # IC # IC # IC # IC # IC # IC # IC #