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J/ApJS/230/6 HST -COS & -STIS absorption-line spectroscopy. II. (Keeney+, 2017)

Characterizing the circumgalactic medium of nearby galaxies with HST/COS and HST/STIS absorption-line spectroscopy. II. Methods and models. Keeney B.A., Stocke J.T., Danforth C.W., Shull J.M., Pratt C.T., Froning C.S., Green J.C., Penton S.V., Savage B.D. <Astrophys. J. Suppl. Ser., 230, 6-6 (2017)> =2017ApJS..230....6K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; QSOs ; Redshifts ; Spectra, ultraviolet Keywords: galaxies: dwarf; galaxies: groups: general; galaxies: halos; galaxies: spiral; intergalactic medium; quasars: absorption lines Abstract: We present basic data and modeling for a survey of the cool, photoionized circumgalactic medium (CGM) of low-redshift galaxies using far-UV QSO absorption-line probes. This survey consists of "targeted" and "serendipitous" CGM subsamples, originally described in Stocke+ (Paper I, 2013ApJ...763..148S). The targeted subsample probes low-luminosity, late-type galaxies at z<0.02 with small impact parameters (<ρ≥71kpc), and the serendipitous subsample probes higher luminosity galaxies at z≲0.2 with larger impact parameters (<ρ≥222kpc). Hubble Space Telescope and FUSE UV spectroscopy of the absorbers and basic data for the associated galaxies, derived from ground-based imaging and spectroscopy, are presented. We find broad agreement with the COS-Halos results, but our sample shows no evidence for changing ionization parameter or hydrogen density with distance from the CGM host galaxy, probably because the COS-Halos survey probes the CGM at smaller impact parameters. We find at least two passive galaxies with HI and metal-line absorption, confirming the intriguing COS-Halos result that galaxies sometimes have cool gas halos despite no on-going star formation. Using a new methodology for fitting HI absorption complexes, we confirm the CGM cool gas mass of Paper I, but this value is significantly smaller than that found by the COS-Halos survey. We trace much of this difference to the specific values of the low-z metagalactic ionization rate assumed. After accounting for this difference, a best-value for the CGM cool gas mass is found by combining the results of both surveys to obtain log(M/M)=10.5±0.3, or ∼30% of the total baryon reservoir of an L≥L*, star-forming galaxy. Description: The 2009-2013 HST COS spectroscopy of many of these targets was described in detail in Danforth+ (2016, J/ApJ/817/111). A detailed discussion of the error analysis of these measurements can be found in Keeney+ (2013ApJ...765...27K). The HST STIS (E140M data only) and FUSE spectroscopy were described in detail in Tilton+ (2012, J/ApJ/759/112). Only one of the targeted sight lines (PG 0832+251) was observed with FUSE, but many of the serendipitous sight lines were. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 135 13 Targeted sample summary table2.dat 135 35 Serendipitous sample summary table3.dat 122 467 Multi-component absorption line fits
See also: VIII/73 : HI Parkes All Sky Survey Catalogue (HIPASS) (Meyer+, 2004) VII/249 : 6dF-DR2 Galaxy Survey (Jones+, 2005) VIII/77 : HI spectral properties of galaxies (Springob+, 2005) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/ApJS/81/5 : Green Bank neutral hydrogen survey (Schneider+, 1992) J/A+AS/114/527 : UV properties of normal galaxies. III. (Rifatto+, 1995) J/ApJS/101/287 : H II Regions in Seyfert galaxies. I. (Tsvetanov+ 1995) J/ApJ/508/200 : QSO low-z Lyα absorbers (Tripp+, 1998) J/ApJ/519/1 : Lyman-break galaxies at z≳4 (Steidel+, 1999) J/ApJ/559/654 : Lyα absorption systems. V. (Chen+, 2001) J/ApJ/596/768 : Optical depths in 19 QSOs (Schaye+, 2003) J/ApJ/617/718 : Atomic data and EW for PKS 0405-123 (Prochaska+, 2004) J/AJ/130/873 : Properties of BQS objects in SDSS DR3 area (Jester+, 2005) J/ApJ/679/194 : Low-z intergalactic medium. III. (Danforth+, 2008) J/ApJS/178/247 : Hα and [NII] survey in local 11 Mpc (Kennicutt+, 2008) J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008) J/ApJ/701/1219 : Galaxy survey in 3 QSO fields (Chen+, 2009) J/ApJ/716/1514 : Galaxies as tracers of the circumgalactic gas (Yao+, 2010) J/ApJS/193/28 : Galaxy survey around 20 UV-bright quasars (Prochaska+, 2011) J/ApJ/740/91 : Lyα & OVI in galaxies around QSOs (Prochaska+, 2011) J/ApJ/759/112 : The UV low-redshift intergalactic medium (Tilton+, 2012) J/MNRAS/434/1765 : Catalog of galaxies around PKS 0405-123 (Johnson+, 2013) J/MNRAS/444/527 : Tully-Fisher distances for Spitzer galaxies (Sorce+, 2014) J/ApJ/804/79 : HST/COS obs. of QSOs within 600kpc of M31 (Lehner+, 2015) J/ApJ/815/91 : z<0.16 CIV absorbers from HST/COS (Burchett+, 2015) J/ApJ/817/111 : HST/COS survey of z<0.9 AGNs. I. (Danforth+, 2016) Byte-by-byte Description of file: table[12].dat
Bytes Format Units Label Explanations
1- 17 A17 --- Line QSO sight line identifier 19- 42 A24 --- Gal Associated galaxy identifier 44- 48 I5 km/s cz1 [654/52914] First value of absorber velocity (czabs) 50- 54 I5 km/s cz2 ? Second value of czabs 56- 60 I5 km/s cz3 ? Third value of czabs 62- 66 I5 km/s cz4 ? Fourth value of czabs 68- 72 I5 km/s cz5 ? Fifth value of czabs 74- 78 I5 km/s cz6 ? Sixth value of czabs 80- 89 A10 --- Inst Instrument(s) used for the absorber detections 91- 95 I5 km/s czgal [649/52873] Galaxy's recession velocity (czgal) 97-101 F5.3 Lsun Lum [0.003/3.5] Rest-frame g-band galaxy luminosity (1) 102 A1 --- u_Lum Uncertainty flag on Lum 104-106 I3 kpc rho [7/505] Impact parameter (ρ) 108-110 I3 kpc Rvir [47/275] Virial radius (Rvir) 111 A1 --- u_Rvir Uncertainty flag on Rvir 113-116 F4.2 --- r/R [0.1/2.1] Ratio of impact parameter to Rvir 117 A1 --- u_r/R Uncertainty flag on r/R 119 A1 --- l_eta Limit flag on eta 120-123 F4.2 --- eta [0.02/4.3] ηρ ratio (2) 125-128 F4.2 --- eVir [0.02/4]? ηvir ratio (3) 129 A1 --- u_eVir Uncertainty flag on eVir 131-134 F4.2 --- eDelv [0.01/6.8]? ηΔv ratio (4) 135 A1 --- u_eDelv Uncertainty flag on eDelv
Note (1): The rest-frame g-band galaxy luminosity in L* units (we adopt Mg*=-20.3, the value of Montero-Dorta & Prada 2009MNRAS.399.1106M at h=0.7). Note (2): The ratio of the impact parameter (in kpc) of the tabulated galaxy to that of the next-nearest galaxy: ηρngnng. Note (3): The ratio of the normalized impact parameter of the tabulated galaxy to that of the next-nearest galaxy: ηvir=(ρ/Rvir)ng/(ρ/Rvir)nng. Note (4): The ratio of the normalized absorber-galaxy velocity difference of the tabulated galaxy to that of the next-nearest galaxy: ηΔv=(|Δv|/vesc)ng/(|Δv|/vesc)nng.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID [1/187] System identifier 5- 21 A17 --- Line Sight line identifier 23- 28 A6 --- Ion Ion identifier 30- 34 I5 km/s cz [643/52945]? Redshift from absorption line 36- 40 F5.1 km/s b [4/128]? Doppler b-value 41 A1 --- u_b Uncertainty flag on b 43- 46 F4.1 km/s e_b [0/57]? Uncertainty in b 48 A1 --- l_logN Limit flag on logN 50- 54 F5.2 [cm-2] logN [11.6/18.4]? Log number abundance 55 A1 --- u_logN Uncertainty flag in logN 57- 60 F4.2 [cm-2] e_logN [0.01/3]? Uncertainty in logN 62-122 A61 --- Comm Additional comments
History: From electronic version of the journal References: Stocke et al. Paper I. 2013ApJ...763..148S
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jun-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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