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A Galaxy Redshift Survey near HST/COS AGN Sight Lines ("IGM-GAL")

Keeney et al. 2018, ApJS, accepted

Introduction

Description of Data Products

Data Access

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Introduction

Keeney et al. (2018) present a galaxy redshift survey around 47 sight lines to UV-bright AGN observed by the Cosmic Origins Spectrograph (COS) in order to establish the connection between galaxies and UV-detected absorption systems in the local Universe. The collection of UV-detected absorption systems was released previously as a MAST HLSP ("IGM"; Danforth et al. 2016.) "IGM-GAL" releases the galaxy spectra obtained as a part of this survey for ~9,000 individual galaxies whose redshift are measured. The galaxy spectra are organized by nearest COS sight line, and for most sight lines this survey is >90% complete to ~0.1 L* galaxies within ~1 Mpc of the sight line (see Keeney et al. 2018 for details). Repeat observations imply that this survey has a redshift accuracy of 60 km/s for emission-line galaxies, 100 km/s for absorption-line galaxies, and 80 km/s for composite galaxies that show both emission and absorption. You can refer to the full collection of IGM-GAL data products using the DOI http://dx.doi.org/10.17909/T9XH52.

Description of Data Products

The spectra toward each sight line are organized into subdirectories based on that sight line's "short name" (see the table below). The file names are defined by the following syntax:

hlsp_igm-gal_<tel>_<ins>_<targ>_<grat>_v1_spec.fits
where:
  • <tel> = telescope name ("aat", "mmt", "wiyn")
  • <ins> = instrument name ("aaomega", "hectospec", "hydra")
  • <targ> = target field, populated as <sight_line>-<pos_angle>-<gal_dist>-ep<epoch_num>
    where:
    • <sight_line> = sight line short name
    • <pos_angle> = position angle of the galaxy w.r.t. the QSO sight line (degrees, measured east from north)
    • <gal_dist> = distance from the QSO to the galaxy (arcsec)
    • <epoch_num> = epoch number (start from "1")
  • <grat> = the grating used
An example of a full file name, including the subdirectory, is:
<...>/sdss1333/hlsp_igm-gal_mmt_hectospec_sdss1333-97-228-ep2_270gpm_v1_spec.fits

SDSS color-composite image showing the closely-spaced 1ES 1028+511 and 1SAX J1032.3+5051 sight lines (blue stars), with gray circles of 20-arcmin radius depicting the regions targeted for > 90% completeness to galaxies with g < 20. Yellow squares show galaxies with SDSS redshifts, and red circles show galaxies with measured redshifts from this survey. Note that most sight lines do not come in pairs like this one.

Data Access

Users may download files for a given sight line using the sortable table below. For a given sight line, click on the "Target table" link to visit a sortable table for all spectra within that sight line. A tar bundle of all galaxy spectra for that sight line is available within each of these pages.

Alternatively, you can download this tar bundle containing every galaxy spectrum for every sight line (tar file is ~500 MB).

Sightline Name Short Name RA
(deg., J2000)
DEC
(deg., J2000)
z_AGN N_TARGETS TARGET_TABLE
1ES1028+511 1es1028 157.8270833 50.893333 0.360 53 Target Table
1ES1553+113 1es1553 238.9293500 11.190103 0.360 128 Target Table
1SAXJ1032.3+5051 1sax1032 158.0670833 50.855556 0.173 61 Target Table
3C263 3c263 174.9874458 65.796997 0.646 114 Target Table
3C57 3c57 30.4881667 -11.542536 0.671 35 Target Table
B1612+266 b1612 243.5442500 26.547361 0.395 150 Target Table
CSO_1022 cso1022 208.3588333 36.347083 0.285 455 Target Table
CSO_1080 cso1080 226.3650000 29.788444 0.526 351 Target Table
FBQSJ1010+3003 fbqs1010 152.5029167 30.056111 0.256 143 Target Table
FBQSJ1030+3102 fbqs1030 157.7462083 31.048806 0.178 308 Target Table
FBQSJ1519+2838 fbqs1519 229.9006250 28.641000 0.270 637 Target Table
H1821+643 h1821 275.4887500 64.343333 0.297 121 Target Table
HE0153-4520 he0153 28.8050000 -45.103333 0.451 223 Target Table
HE0226-4110 he0226 37.0633004 -40.954058 0.493 247 Target Table
HE0435-5304 he0435 69.2116667 -52.980278 0.425 297 Target Table
HE0439-5254 he0439 70.0495833 -52.805000 1.053 238 Target Table
HS1102+3441 hs1102 166.4158254 34.426222 0.508 152 Target Table
MRK421 mrk421 166.1137917 38.208833 0.030 56 Target Table
PG0832+251 pg0832 128.8991667 24.994722 0.330 96 Target Table
PG0953+414 pg0953 149.2183750 41.256139 0.234 131 Target Table
PG1001+291 pg1001 151.0107771 28.926439 0.327 119 Target Table
PG1048+342 pg1048 162.9329000 33.990750 0.167 82 Target Table
PG1115+407 pg1115 169.6262500 40.431667 0.154 93 Target Table
PG1116+215 pg1116 169.7858333 21.321667 0.177 120 Target Table
PG1121+422 pg1121 171.1632667 42.029172 0.225 139 Target Table
PG1216+069 pg1216 184.8372167 6.644033 0.331 86 Target Table
PG1222+216 pg1222 186.2268675 21.379539 0.432 67 Target Table
PG1259+593 pg1259 195.3037500 59.035278 0.478 153 Target Table
PG1424+240 pg1424 216.7516325 23.800011 0.160 70 Target Table
PG1626+554 pg1626 246.9838333 55.375419 0.133 167 Target Table
PHL1811 phl1811 328.7562500 -9.373611 0.190 389 Target Table
PKS2005-489 pks2005 302.3557942 -48.831589 0.071 450 Target Table
Q1230+0115 q1230 187.7083508 1.255972 0.117 60 Target Table
RBS711 rbs711 129.2454583 44.433972 0.255 268 Target Table
RXJ0439.6-5311 rxj0439 69.9110146 -53.192100 0.243 234 Target Table
RXJ2154.1-4414 rxj2154 328.7127688 -44.235000 0.344 293 Target Table
S50716+714 s0716 110.4727083 71.343444 0.300 251 Target Table
SBS0956+509 sbs0956 149.8819583 50.746972 0.143 337 Target Table
SBS1108+560 sbs1108 167.8841667 55.790556 0.768 159 Target Table
SBS1122+594 sbs1122 171.4741250 59.172667 0.851 150 Target Table
SDSSJ1028+2119 sdss1028 157.0606667 21.331972 0.374 142 Target Table
SDSSJ1333+4518 sdss1333 203.2534583 45.302500 0.320 213 Target Table
SDSSJ1439+3932 sdss1439 219.8227917 39.545222 0.344 145 Target Table
SDSSJ1540-0205 sdss1540 235.0810833 -2.084833 0.320 156 Target Table
TON1187 ton1187 153.2633333 35.856389 0.079 59 Target Table
TON236 ton236 232.1691746 28.424928 0.450 174 Target Table
TON580 ton580 172.7895833 31.234722 0.289 82 Target Table
VIIZW244 viizw244 131.1887917 76.886028 0.131 232 Target Table