Sloan Digital Sky Survey Imaging of Low Galactic Latitude Fields: Technical Summary and Data Release

Finkbeiner, Douglas P.; Padmanabhan, Nikhil; Schlegel, David J.; Carr, Michael; Gunn, James E.; Rockosi, Constance M.; Sekiguchi, M.; Lupton, Robert H.; Knapp, G. R.; Ivezić, Željko; Blanton, Michael R.; Hogg, David W.; Adelman-McCarthy, Jennifer K.; Annis, J.; Hayes, J. J. E.; Kinney, Ellynne; Long, Daniel C.; Seljak, Uroš; Strauss, Michael A.; Yanny, B.; Agüeros, Marcel A.; Allam, S.; Anderson, Scott F.; Bahcall, Neta A.; Baldry, I. K.; Bernardi, Mariangela; Boroski, William N.; Briggs, John W.; Brinkmann, J.; Brunner, Róbert; Budavàri, Tamás; Castander, F. J.; Covey, Kevin R.; Csabai, István; Doi, Mamoru; Dong, Feng; Eisenstein, Daniel J.; Fan, Xiaohui; Friedman, S. D.; Fukugita, M.; Gillespie, Bruce; Grebel, Eva K.; Gurbani, Vijay K.; Haas, E. de; Harris, Frederick H.; Hendry, John S.; Hennessy, G. S.; Jester, Sebastian; Johnston, David; Jorgensen, A. M.; Jurić, Mario; Kent, Stephen M.; Kniazev, A. Y.; Krzesiński, Jurek; Leger, R. French; Lin, Huan; Loveday, Jon; Mannery, Ed; Martínez–Delgado, David; McGehee, P.; Meiksin, Avery; Munn, Jeffrey A.; Neilsen, Eric H.; Newman, Peter R.; Nitta, A.; Pauls, George; Quinn, Thomas; Rafikov, Roman R.; Richards, Gordon T.; Richmond, M.; Schneider, Donald P.; Schroeder, Joshua J.; Shimasaku, K.; Siegmund, Walter A.; Smith, J. Allyn; Snedden, Stephanie A.; Stebbins, Albert; Szalay, Alexander S.; Szokoly, G.; Tegmark, Max; Tucker, D. L.; Uomoto, Alan; Berk, D. E. vanden; Weinberg, David H.; West, Andrew A.; Yasuda, Naoki; Yocum, D. R.; York, Donald G.; Zehavi, Idit

doi:10.1086/425050

Cited by 74 publications

(79 citation statements)

References 32 publications

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“…All of the data were processed by completely automated pipelines that detect and measure photometric properties of objects, and astrometrically calibrate the data (Lupton et al 2001;Tucker et al 2006). The SDSS has had seven major data releases, and is now complete (Stoughton et al 2002;Abazajian et al 2003Abazajian et al , 2004Abazajian et al , 2005Finkbeiner et al 2004;Adelman-McCarthy et al 2006, 2007Adelman-McCarthy et al 2008;Abazajian et al 2009). …”

Section: Datamentioning

confidence: 99%

Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample

Joachimi¹,

Mandelbaum²,

Abdalla³

et al. 2011

A&A

280

512

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Correlations between the intrinsic shapes of galaxies and the large-scale galaxy density field provide an important tool to investigate galaxy intrinsic alignments, which constitute the major potential astrophysical systematic in cosmological weak lensing (cosmic shear) surveys, but also yield insight into the formation and evolution of galaxies. We measure galaxy position-shape correlations in the MegaZ-LRG sample for more than 800 000 luminous red galaxies for comoving transverse separations of 0.3 < r p < 60 h −1 Mpc, making the first such measurement with a photometric redshift sample. In combination with a re-analysis of several spectroscopic SDSS samples, we constrain an intrinsic alignment model for early-type galaxies over long baselines in redshift (z 0.7) and luminosity (4 mag) with high statistical precision. We develop and test the formalism to incorporate photometric redshift scatter in the modelling of these observations. For r p > 6 h −1 Mpc, the fits to galaxy position-shape correlation functions are consistent with the scaling with r p and redshift of a revised, nonlinear version of the linear alignment model for all samples. An extra redshift dependence ∝ (1 + z) η other is constrained to η other = −0.3 ± 0.8 (1σ). To obtain consistent amplitudes for all data, an additional dependence on galaxy luminosity ∝L β with β = 1.1 +0.3 −0.2 is required. The normalisation of the intrinsic alignment power spectrum is found to be (0.077 ± 0.008) ρ −1 cr for galaxies at redshift 0.3 and r band magnitude of −22 (k-and evolution-corrected to z = 0). Assuming zero intrinsic alignments for blue galaxies, we assess the bias on cosmological parameters for a tomographic CFHTLSlike lensing survey given our new constraints on the intrinsic alignment model parameter space. Both the resulting mean bias and its uncertainty are smaller than the 1σ statistical errors when using the constraints from all samples combined. The addition of MegaZ-LRG data is critical to achieving constraints this strong, reducing the uncertainty in intrinsic alignment bias on cosmological parameters by factors of three to seven.

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Section: Datamentioning

confidence: 99%

Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample

Joachimi¹,

Mandelbaum²,

Abdalla³

et al. 2011

A&A

280

512

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“…The L1630N cloud was covered entirely and scanned multiple times (∼3.3 times on average), resulting in average 10σ limiting magnitudes of 21.9, 23.0, 22.4, 21.8, and 20.2, respectively. The L1630N data are publicly available in the SDSS "Low Galactic Latitude Fields" data release (Finkbeiner et al 2004). Only about half of the L1641 cloud was covered by SDSS and the covered parts were scanned an average of ∼1.3 times, with resulting 10σ limiting magnitudes of about 20.5, 21.7, 21.4, 21.1 and 19.7, respectively.…”

Section: Optical Photometrymentioning

confidence: 99%

“…These consist of public SDSS data for L1630N (Finkbeiner et al 2004), previously unpublished SDSS data and new LAICA data for L1641, publicly available NIR photometry from 2MASS (Skrutskie et al 2006), as well as publicly accessible and previously published (Megeath et al 2005a) Spitzer data. Without measured spectral types, reliable estimation of the luminosity and effective temperature is hampered by a degeneracy between the stellar temperature and reddening.…”

Section: Survey Productsmentioning

confidence: 99%

Star and protoplanetary disk properties in Orion's suburbs

Fang

Boekel²,

Wang³

et al. 2009

A&A

251

401

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Context. Knowledge of the evolution of circumstellar accretion disks is pivotal to our understanding of star and planet formation; and yet despite intensive theoretical and observational studies, the disk dissipation process is not well understood. Infrared observations of large numbers of young stars, as performed by the Spitzer Space Telescope, may advance our knowledge of this inherently complex process. While infrared data reveal the evolutionary status of the disk, they hold little information on the properties of the central star and the accretion characteristics. Aims. Existing 2MASS and Spitzer archive data of the Lynds 1630N and 1641 clouds in the Orion GMC provide disk properties of a large number of young stars. We wish to complement these data with optical data that provide the physical stellar parameters and accretion characteristics. Methods. We performed a large optical spectroscopic and photometric survey of the aforementioned clouds. Spectral types, as well as accretion and outflow characteristics, are derived from our VLT/VIMOS spectra. Optical SDSS and CAHA/LAICA imaging was combined with 2MASS, Spitzer IRAC, and MIPS imaging to obtain spectral energy distributions from 0.4 to 24 μm. Reddened model atmospheres were fitted to the optical/NIR photometric data, keeping T eff fixed at the spectroscopic value. Mass and age estimates of individual objects were made through placement in the HR diagram and comparison to several sets of pre-main sequence evolutionary tracks. Results. We provide a catalog of 132 confirmed young stars in L1630N and 267 such objects in L1641. We identify 28 transition disk systems, 20 of which were previously unknown, as well as 42 new transition disk candidates for which we have broad-band photometry but no optical spectroscopy. We give mass and age estimates for the individual stars, as well as equivalent widths of optical emission lines, the extinction, and measures of the evolutionary state of the circumstellar dusty disk. We estimate mass accretion ratesṀ acc from the equivalent widths of the Hα, Hβ, and He I 5876 Å emission lines, and find a dependence ofṀ acc ∝ M α * , with α ∼ 3.1 in the subsolar mass range that we probe. An investigation of a large literature sample of mass accretion rate estimates yields a similar slope of α ∼ 2.8 in the subsolar regime, but a shallower slope of α ∼ 2.0 if the whole mass range of 0.04 M ≤ M * ≤ 5 M is included. The fraction of stars with transition disks that show significant accretion activity is relatively low compared to stars with still optically thick disks (26 ± 11% vs. 57 ± 6%, respectively). However, those transition disks that do show significant accretion have the same median accretion rate as normal optically thick disks of 3−4 × 10 −9 M yr −1 . Analyzing the age distribution of various populations, we find that the ages of the CTTSs and the WTTSs with disks are statistically indistinguishable, the WTTSs without disks are significantly older than the CTTSs, and the ages of the transition disks and the WTTSs wi...

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“…The SDSS (York et al 2000;Stoughton et al 2002;Abazajian et al 2003Abazajian et al , 2004Finkbeiner et al 2004;Abazajian et al 2005;Adelman-McCarthy et al 2006) is surveying 10 4 deg 2 of highlatitude sky in five bandpasses: u, g, r, i, and z (Fukugita et al 1996;Gunn et al 1998Gunn et al , 2006. The images are processed (Lupton et al 2001;Stoughton et al 2002;Pier et al 2003) and calibrated (Hogg et al 2001;Smith et al 2002;Tucker et al 2005) to produce five-band catalogs, from which galaxies (Eisenstein et al 2001;Strauss et al 2002), quasars (Richards et al 2002), and stars are selected for follow-up spectroscopy.…”

Section: The Sdssmentioning

confidence: 99%

A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4

Eisenstein¹,

Liebert²,

Harris³

et al. 2006

ASTROPHYS J SUPPL S

Self Cite

396

458

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We present a catalog of 9316 spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey Data Release 4. We have selected the stars through photometric cuts and spectroscopic modeling, backed up by a set of visual inspections. About 6000 of the stars are new discoveries, roughly doubling the number of spectroscopically confirmed white dwarfs. We analyze the stars by performing temperature and surface gravity fits to grids of pure hydrogen and helium atmospheres. Among the rare outliers are a set of presumed helium-core DA white dwarfs with estimated masses below 0.3 M , including two candidates that may be the lowest-mass yet found. We also present a list of 928 hot subdwarfs.

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Sloan Digital Sky Survey Imaging of Low Galactic Latitude Fields: Technical Summary and Data Release

Cited by 74 publications

References 32 publications

Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample

Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample

Star and protoplanetary disk properties in Orion's suburbs

A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4

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