Lya Working Group Quasar Redshift Catalog (zlya)¶
Overview¶
This document outlines the contents of the Black Hole (BH) mass catalog for DESI quasars at redshifts below 1.6, to be incorporated into the forthcoming work by Pan in prep. We select quasars from the Iron zcatalog and crossmatch with the Iron FastSpecFit catalog. The catalog construction involves applying constraints such as \(0.6<z<1.6\), \(r<22\), survey== “main”, and spectype==”qso”, resulting in a final sample of 490,468 quasars. The spectral properties are measured using DASpec, which will be detailed in the paper. The BH mass estimation is performed using different equations based on measurements from FastSpecFit and DASpec, with relevant information presented in this catalog.
Data Access¶
Data URL: https://data.desi.lbl.gov/public/dr1/vac/dr1/qmassiron
NERSC access:
/global/cfs/cdirs/desi/public/dr1/vac/dr1/qmassiron
Documentation¶
Files¶
VAC_BHmass_338_v1.7.fits: Main catalog file of black hole masses.
Data Model¶
Contents¶
| HDU Number | EXTNAME | TYPE | Contents |
|---|---|---|---|
| HDU00 | PRIMARY | IMAGE | Keywords only |
| HDU01 | BHMASS | BINTABLE | Table with spectral fitting results and mass estimations. |
HDU0¶
| Key | Example Value | TYPE | Comment |
|---|---|---|---|
| SPECPROD | iron | str | spectroscopic production name |
| COADDTYP | healpix | str | spectral coadd type (healpix,cumulative,pernight,perexp) |
| INPUTZ | FastSpecFit | str | input redshifts provided (FastSpecFit or other redshift catalog) |
| NOSCORR | F | str | ‘F’ means no smooth continuum correction |
| NOPHOTO | F | str | ‘F’ means no fitting to photometry |
| DEPNAM00 | python | str | coding language |
| DEPVER00 | 2.7.16 & 3.8.3 | str | version |
HDU1¶
| Name | Type | Units | Description |
|---|---|---|---|
| RA | float64 | deg | Right Ascension in degrees |
| DEC | float64 | deg | Declination in degrees |
| TARGETID | int64 | Target ID | |
| PROGRAM | string | Program ID | |
| HEALPIX | int64 | HEALPix ID | |
| REDSHIFT | float64 | Redshift from FSF | |
| RMAG | float64 | mag | 22.5-2.5*log10(FLUX_R) |
| EW_DAS | float64 | Angstrom | Equivalent Width of Mg II Emission Line (DAS) |
| EW_DAS_ERR | float64 | Angstrom | Error of EW_DAS |
| FWHM_DAS | float64 | km/s | Full Width at Half Maximum of Mg II Emission Line (DAS) |
| FWHM_DAS_ERR | float64 | km/s | Error of FWHM_DAS |
| RFE_DAS | float64 | Strength of iron emission in UV (DAS) | |
| RFE_DAS_ERR | float64 | Error of RFE_DAS | |
| L3000_DAS | float64 | 1e44 erg/s | Luminosity at 3000Å (DAS) |
| L3000_DAS_ERR | float64 | 1e44 erg/s | Error of L3000_DAS |
| LOGMASS_DAS_Pan25 | float64 | \(\mathrm{M}_{\odot}\) | Iron-corrected BH mass based on Pan25 (DAS) |
| LOGMASS_DAS_Pan25_ERR | float64 | \(\mathrm{M}_{\odot}\) | Error of LOGMASS_DAS_Pan25 |
| LOGMASS_DAS_VO09 | float64 | \(\mathrm{M}_{\odot}\) | BH mass based on VO09 (DAS) |
| LOGMASS_DAS_VO09_ERR | float64 | \(\mathrm{M}_{\odot}\) | Error of LOGMASS_DAS_VO09 |
| LOGMASS_DAS_Shen11 | float64 | \(\mathrm{M}_{\odot}\) | BH mass based on Shen11 (DAS) |
| LOGMASS_DAS_Shen11_ERR | float64 | \(\mathrm{M}_{\odot}\) | Error of LOGMASS_DAS_Shen11 |
| LOGMASS_DAS_Le20 | float64 | \(\mathrm{M}_{\odot}\) | BH mass based on Le20 (DAS) |
| LOGMASS_DAS_Le20_ERR | float64 | \(\mathrm{M}_{\odot}\) | Error of LOGMASS_DAS_Le20 |
| LOGMASS_DAS_Yu23 | float64 | \(\mathrm{M}_{\odot}\) | BH mass based on Yu23 (DAS) |
| LOGMASS_DAS_Yu23_ERR | float64 | \(\mathrm{M}_{\odot}\) | Error of LOGMASS_DAS_Yu23 |
| L3000_FSF | float64 | 1e44 erg/s | Luminosity at 3000Å (FSF) |
| FWHM_FSF | float64 | km/s | Full Width at Half Maximum of MgII (FSF) |
| LOGMASS_FSF_VO09 | float64 | \(\mathrm{M}_{\odot}\) | BH mass based on VO09 (FSF) |
Notes: FSF (FastSpecFit), DAS (DASpec), VO09 (Vestergaard & Osmer 2009), Shen11 (Shen et al. 2011), Le20 (Le et al. 2020), Yu23 (Yu et al. 2023), Pan25 (Pan et al. 2025)
Release History¶
V0¶
Date: 2023.12.18
- The sample size is 196,718. The initial quasar catalog is selected from the Iron LSS quasar catalog.
- In this version, we only consturct the quasar sample at \(0.6<z<1.2\). We will extend the redshift range in the future version
- In this version, we only measure BH mass based on UV MgII lines. We will provide the Hbeta-based BH mass in the future.
- In this version, we only use the quation from Vestergaard & Osmer 2009 to measure the uncalibrated MgII-based mass. We will provide more results obatined from different estimators in the future.
V1.1¶
Date: 2024.01.11
- The smaple size is 490,468. We directly select quasars from Iron zcatalog with spectype==”qso”.
- We extend our redshift range to \(0.6<z<1.6\).
- The rmag limit of this sample is 22 mag.
- We provide different BH mass estimation based on different empirical relations, e.g., VO09, S11, S23, Y23, and the iron-corrected \(R\)-\(L\) relation in P24.
- We will extend the redshift range to 0.2 and provide the Hbeta-based BH mass in the future version.
V1.2¶
Date: 2024.01.25
- Update the formats of VAC file and readme file.
V1.3¶
Date: 2024.02.26
- minor changes of LOGMASS_DAS_P24 (just fixed a small bug in the code, no scientific modifications).
- RA digit: 5 -> 6
V1.4¶
Date: 2024.03.12
- S11 -> Shen11; S23 -> Shen23; Y23 -> Yu23; P24 -> Pan24
V1.5¶
Date: 2024.06.16
- Change the f-factor from 1.3 to 1.1 (better consistent with the zeropoint of VO09).
V1.6¶
Date: 2024.12.20
- Change the f-factor of Yu23 from 0.78 to 1.1 for consistency.
- Add Le20
- Remove Shen24
- Rename: Pan24 -> Pan25
V1.7¶
Date: 2024.1.20
- Update all column names to be in ALLCAPS.
- Update units
Contributors & Contact¶
Contributors: Zhiwei Pan, Linhua Jiang, Onoue, Masafusa, Wei-Jian Guo, and others.
Contact Zhiwei Pan for questions about this catalog.