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ESO X-shooter, User Manual

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X-shooter  

User Manual

 

Doc: 
Issue 
Date 
Page 

VLT-MAN-ESO-12000-0115      
1   
01.03.2009       
3 of 60 

 

 
 

ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany 

 

CHANGE RECORD 

 

ISSUE 

DATE 

SECTION/PARA. 

AFFECTED 

REASON/INITIATION 

DOCUMENTS/REMARKS 

0.1 

13.01.06 

All 

FDR  version:  ToC  prepared  
by Céline Péroux 

0.2 

14.08.08 

All 

PAE  version  prepared  by  
Joël Vernet

 

1 

01.03.09 

All 

First  release  prepared  by 
Joël 

Vernet, 

with 

contributions 

by 

Elena 

Mason 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

Summary of Contents for X-shooter

Page 1: ...09 Prepared Jo l Vernet Name Date Signature Approved Sandro D Odorico Name Date Signature Released Name Date Signature European Organisation for Astronomical Research in the Southern Hemisphere Organi...

Page 2: ...X shooter User Manual Doc Issue Date Page VLT MAN ESO 12000 0115 1 01 03 2009 2 of 60 ESO Karl Schwarzschild Str 2 85748 Garching bei M nchen Germany...

Page 3: ...5748 Garching bei M nchen Germany CHANGE RECORD ISSUE DATE SECTION PARA AFFECTED REASON INITIATION DOCUMENTS REMARKS 0 1 13 01 06 All FDR version ToC prepared by C line P roux 0 2 14 08 08 All PAE ver...

Page 4: ...n Correctors 15 2 2 2 The UVB spectrograph 16 Slit carriage 16 Optical layout 17 Detector 17 2 2 3 The VIS spectrograph 19 Slit carriage 19 Optical layout 19 Detector 19 2 2 4 The NIR spectrograph 19...

Page 5: ...tions 36 5 1 2 Acquisition templates 37 Slit acquisition template 37 IFU acquisition template 38 5 1 3 Science templates 39 Slit observations 39 5 1 3 1 1 Staring 39 5 1 3 1 2 Synchronized staring sli...

Page 6: ...X shooter User Manual Doc Issue Date Page VLT MAN ESO 12000 0115 1 01 03 2009 6 of 60 ESO Karl Schwarzschild Str 2 85748 Garching bei M nchen Germany...

Page 7: ...UV blue arm Range 300 550 nm in 12 orders Resolution 5100 1 slit Slit width 0 5 0 8 1 0 1 3 1 6 5 0 Detector 4k x 2k E2V CCD Visual red arm Range 550 1000 nm in 14 orders Resolution 8800 0 9 slit Sli...

Page 8: ...characteristics are summarized in Table 1 X shooter was built by a Consortium involving institutes from Denmark Italy The Netherlands France and ESO Name of the institutes and their respective contrib...

Page 9: ...Software DFS Data Flow System ESO European Southern Observatory GUI Graphical User Interface ICS Instrument Control Software IFU Integral Field Unit ISF Instrument Summary File IWS Instrument Worksta...

Page 10: ...omponents The backbone which is directly mounted on the Cassegrain derotator of the telescope It contains all pre slit optics the calibration unit a slide with the 3 positions mirror and the IFU the a...

Page 11: ...X shooter in the order they are encountered along the optical path going from the telescope to the detectors see Figure 2 The functionalities of the different sub units are explained and reference is...

Page 12: ...libration system is given in Section 4 The Acquisition and Guiding slide Light coming either directly from the telescope or from the Calibration Unit described above reaches first the A G slide This s...

Page 13: ...t transmission TBC but drops to 50 TBC below 400 nm due to reduced coating efficiency in the blue The Acquisition and Guiding Camera The A G camera allows to visually detect and centroid objects from...

Page 14: ...ng 80 of the energy for a seeing of 0 8 for airmass 1 with sky brightness 3 days from new moon Filter 1 Effective Central 2 Effective FWHM 3 Efficiency incl atmosphere 4 Limiting Mag 3s SNR 5 5 Limiti...

Page 15: ...rotating double prisms The focal reducers bring the focal ratio from f 13 41 to f 6 5 and provide a measured plate scale at the entrance slit of the spectrographs of 3 91 mm in the UVB and 3 82 mm in...

Page 16: ...d with the LPKF Laser Cutter used for FORS and VIMOS It is mounted on a motorized slide in order to select one of the 9 positions available All science observation slits are 11 high and different widt...

Page 17: ...varies by 22 7 m C which corresponds to a defocus of 9 m C or 0 08 C This is automatically compensated at the beginning of every exposure by moving the triplet doublet of the camera by 10 9 m C Detect...

Page 18: ...High 0 64 Low 1 5 2 12 Readout noise e rms Slow 2 6 Fast 4 5 Slow 3 2 Fast 5 3 Short DIT 22 DIT 600s 5 5 Saturation ADU 65000 TBC 65000 45000 TBC Full frame readout time s 1x1 slow fast 70 19 1x2 slo...

Page 19: ...m at f 2 8 plate scale 8 98 mm onto the detector not tilted Focussing is obtained by acting on the triplet doublet sub unit of the camera However unlike the UVB arm the back focal length varies less t...

Page 20: ...d calibration masks Size Purpose 0 4 11 slit SCI CAL 0 6 11 slit SCI CAL 0 9 11 slit SCI CAL 1 2 11 slit SCI CAL 1 5 11 slit SCI CAL 5 0 11 slit CAL Raw of 9 pinholes of 0 5 spaced at 1 4 CAL 0 5 pinh...

Page 21: ...off plane angle is 1 8 After dispersion the collimator creates an intermediate spectrum near the entrance slit where M8 a spherical mirror acts as a field mirror relocating the pupil between L2 and L...

Page 22: ...ESO 12000 0115 1 01 03 2009 22 of 60 ESO Karl Schwarzschild Str 2 85748 Garching bei M nchen Germany Figure 8 example of UVB top VIS middle and NIR bottom calibration frames Strong order curvature an...

Page 23: ...30 525 3 550 5 561 0 29 535 8 568 0 580 2 28 554 6 585 9 600 8 27 575 2 607 7 622 9 26 597 4 629 5 646 8 25 621 3 653 8 672 5 24 647 2 682 1 700 4 23 675 4 711 2 730 7 22 706 1 742 6 763 8 21 739 7 7...

Page 24: ...559 5 nm and 1024 nm respectively Between UVB and VIS the region where the combined dichroics transmit less than 80 is 556 0 563 8 nm 7 8 nm wide This region falls in the UVB order 13 and VIS order 29...

Page 25: ...ers air mass 1 2 0 8 seeing 1 slit for UVB 0 9 slit for VIS and NIR The first version of the ESO ETC was used to compute these values The model uses overall efficiencies measured during commissioning...

Page 26: ...out it has to wait until the first one is fully readout and transferred to disk until readout can start 2 4 2 Remnance TBD 2 4 3 Instrument stability Backbone flexures The active flexure compensation...

Page 27: ...nhole present in each slit slide Commands are sent to the three tip tilt mirrors based on computed flexures 4 The Acquisition and Guiding slide is set to MIR position the field is now visible in the a...

Page 28: ...emplates SHOOT_slt_obs_StareSynchro or SHOOT_ifu_obs_StareSynchro should be used In this case the number of exposures is fixed to one per arm Exposure times can still be different in each arm but the...

Page 29: ...sition S with the possibility of adding a small jittering around the object and the sky position One cycle is a pair of OS or SO observations Cycles are repeated in OSSO sequences For each arm the use...

Page 30: ...5 s 3 4 2 Example of execution time computation Below a generic example of how total execution time shall be estimated For a nod on slit sequence with 2 cycles ABBA sequence returning to the original...

Page 31: ...t IFU flats 5 setting D2 lamp 5 setting halo lamp 5 setting daily Pixel to pixel variations blaze function correction Arcs single pinhole 1 1 1 ON OFF weekly Pipeline calibration first guess disp solu...

Page 32: ...ion is SHOOT_slt_cal_UvbVisArcsMultiplePinhole and SHOOT_slt_cal_NIRArcsMultiplePinhole provisional those two templates will be merged into a single one if the use of the ThAr lamp for the NIR arm is...

Page 33: ...equency fringes with peak to valley amplitudes up to 5 are present in the red part of the VIS spectra 4 4 Spectrophotometric calibration 4 4 1 Telluric absorption correction The visual red and a near...

Page 34: ...e used other stellar types as telluric standards For example F dwarfs are commonly used Users should think carefully about which star is best for their program Although the Observatory will automatica...

Page 35: ...ully support both instrument modes SLIT and IFU and deliver the following products Sky subtracted cosmic ray hits cleaned flux and wavelength calibrated 2D spectra rectified to a regular grid in wavel...

Page 36: ...stronomical offset conventions and definitions The positive position angle PA is defined from North to East Offsets are always given in arc seconds but the reference system can be chosen to be the sky...

Page 37: ...differential tracking velocity arcsec s TEL TARG ADDVELDELTA 15 0 15 0 0 0 DEC differential tracking velocity arcsec s TEL TARG OFFSETALPHA 0 0 RA blind offset arcsec TEL TARG OFFSETDELTA 0 0 DEC bli...

Page 38: ...l tracking velocity arcsec s TEL TARG ADDVELDELTA 15 0 15 0 0 0 DEC differential tracking velocity arcsec s TEL TARG OFFSETALPHA 0 0 RA blind offset arcsec TEL TARG OFFSETDELTA 0 0 DEC blind offset ar...

Page 39: ...slide INS OPTI5 NAME see Table 8 NODEFAULT NIR Slit slide DET1 WIN1 UIT1 0 3600 NODEFAULT UVB Exposure Time s DET1 READ CLKDESCR see Table 5 100k 1pt hg UVB read out mode DET2 WIN1 UIT1 0 3600 NODEFA...

Page 40: ...I5 NAME see Table 8 NODEFAULT NIR Slit slide DET1 WIN1 UIT1 0 3600 NODEFAULT UVB Exposure Time s DET1 READ CLKDESCR see Table 5 100k 1pt hg UVB read out mode DET2 WIN1 UIT1 0 3600 NODEFAULT VIS Exposu...

Page 41: ...CLKDESCR see Table 5 100k 1pt hg UVB read out mode DET2 WIN1 UIT1 0 3600 NODEFAULT VIS Exposure Time s DET2 READ CLKDESCR see Table 5 100k 1pt hg VIS read out mode DET3 DIT 0 88 3600 NODEFAULT NIR Det...

Page 42: ...d out mode DET2 WIN1 UIT1 0 3600 NODEFAULT VIS Exposure Time s DET2 READ CLKDESCR see Table 5 100k 1pt hg VIS read out mode DET3 DIT 0 88 3600 NODEFAULT NIR Detector Integration Time s DET3 NDIT 1 999...

Page 43: ...NODEFAULT VIS Exposure Time s DET2 READ CLKDESCR see Table 5 100k 1pt hg VIS read out mode DET3 DIT 0 88 3600 NODEFAULT NIR Detector Integration Time s DET3 NDIT 1 9999 1 number of DITs SEQ NEXP UVB 0...

Page 44: ...1pt hg UVB read out mode DET2 WIN1 UIT1 0 3600 NODEFAULT VIS Exposure Time s DET2 READ CLKDESCR see Table 5 100k 1pt hg VIS read out mode DET3 DIT 0 88 3600 NODEFAULT NIR Detector Integration Time s D...

Page 45: ...hg UVB read out mode DET2 WIN1 UIT1 0 3600 NODEFAULT VIS Exposure Time s DET2 READ CLKDESCR see Table 5 100k 1pt hg VIS read out mode DET3 DIT 0 88 3600 NODEFAULT NIR Detector Integration Time s DET3...

Page 46: ...88 3600 NODEFAULT NIR Detector Integration Time s DET3 NDIT 1 9999 1 number of DITs SEQ NEXP UVB 0 999 1 UVB number of exposures per offset position SEQ NEXP VIS 0 999 1 VIS number of exposure per off...

Page 47: ...tegration Time s DET3 NDIT 1 9999 1 number of DITs SEQ NEXP UVB 0 999 1 UVB number of exposures per offset position SEQ NEXP VIS 0 999 1 VIS number of exposure per offset position SEQ NEXP NIR 0 999 1...

Page 48: ...number of exposure Fixed Value INS MODE SLTSPEC Instrument Mode Table 26 User and fixed keywords for SHOOT_slt_cal_NIRArcs SHOOT_slt_cal_NIRArcs Keyword Range Default Label in P2PP INS OPTI5 NAME see...

Page 49: ...Keyword Range Default Label in P2PP DET1 WIN1 UIT1 0 36000 1 UVB Exposure Time DET1 READ CLKDESCR see Table 5 400k 1pt lg UVB readout mode DET2 WIN1 UIT1 0 36000 1 VIS Exposure Time DET2 READ CLKDESC...

Page 50: ...d keywords for SHOOT_slt_cal_UBVHighLampFlatSinglePinhole SHOOT_slt_cal_UVBHighLampFlatSinglePinhole tsf Keyword Range Default Label in P2PP DET1 WIN1 UIT1 0 36000 1 UVB Exposure Time DET1 READ CLKDES...

Page 51: ...slt_cal_UVBVisArcsMultiplePinhole Keyword Range Default Label in P2PP DET1 WIN1 UIT1 0 36000 1 UVB Exposure Time DET1 READ CLKDESCR see Table 5 400k 1pt lg UVB readout mode DET2 WIN1 UIT1 0 36000 1 VI...

Page 52: ...User and fixed keywords for SHOOT_ifu_cal_UBVLampFlat SHOOT_ifu_cal_UVBLampFlat Keyword Range Default Label in P2PP DET1 READ CLKDESCR see Table 5 100k 1pt hg UVB readout mode DET1 WIN1 UIT1 HIGHF 0 3...

Page 53: ...ST T FF Lamp VIS Table 41 User and fixed keywords for SHOOT_slt_cal_NIRLampFlat SHOOT_slt_cal_NIRLampFlat Keyword Range Default Label in P2PP INS OPTI5 NAME see Table 8 NIR Slit slide DET3 DIT 0 36000...

Page 54: ...T1 0 VIS Exposure Time Table 44 User and fixed keywords for SHOOT_gen_cal_DarkUVBVis SHOOT_gen_cal_DarkUVBVis Keyword Range Default Label in P2PP DET1 WIN1 UIT1 0 3600 1 UVB Exposure Time DET1 READ CL...

Page 55: ...0 NODEFAULT NIR Exposure Time DET3 NDIT 1 9999 1 Number of DITs SEQ NEXPO UVB 0 999 1 UVB number of exposure SEQ NEXPO VIS 0 999 1 VIS number of exposure SEQ NEXPO NIR 0 999 1 NIR number of exposure F...

Page 56: ...Number of DITs SEQ NEXPO UVB 0 30 1 UVB number of exposure SEQ NEXPO VIS 0 30 1 VIS number of exposure SEQ NEXPO NIR 0 30 1 NIR number of exposure Fixed Value INS MODE CALIB Instrument Mode Table 49...

Page 57: ...2763 SCI CAL 6 1 12 6 slit 251 3165 With IFU only 7 Raw of 9 pinholes of 0 5 spaced at 1 4 126 holes spaced by 352 CAL 8 0 5 11 slit 126 2763 SCI CAL 9 1 0 x11 slit 251 2763 SCI CAL 5 2 2 VIS Table 5...

Page 58: ...95 5683 CAL 3 0 9 11 slit 485 5683 SCI CAL 4 1 0 12 6 slit 544 6510 With IFU only 5 1 2 11 slit 647 5683 SCI CAL 6 tilted slit TECH focus 7 1 5 11 slit 809 5683 SCI CAL 8 Blind 9 0 4 pinhole 216 hole...

Page 59: ...ge VLT MAN ESO 12000 0115 1 01 03 2009 59 of 60 ESO Karl Schwarzschild Str 2 85748 Garching bei M nchen Germany 5 4 A G camera filter curves A G Camera CCD 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 200...

Page 60: ...X shooter User Manual Doc Issue Date Page VLT MAN ESO 12000 0115 1 01 03 2009 60 of 60 ESO Karl Schwarzschild Str 2 85748 Garching bei M nchen Germany...

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